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merge: add/zygiskd-c99 branch

Browse Source 
This commit merges the Zygiskd C99 branch, which not only adds the re-written Zygisk daemon, but also implement fixes in the ptrace command.
This commit is contained in:
ThePedroo
2024-11-10 23:13:15 -03:00
parent 3d2125d6c0 519d1db6a0
commit 97af7fe2da
44 changed files with 3562 additions and 1802 deletions
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33
.github/workflows/ci.yml vendored
View File

@@ -34,20 +34,6 @@ jobs:
with:
gradle-home-cache-cleanup: true
- name: Setup rust-cache
uses: Swatinem/rust-cache@v2
with:
workspaces: zygiskd/src -> ../build/intermediates/rust
cache-targets: false
- name: Setup Rust
run: |
rustup override set nightly
rustup target add aarch64-linux-android
rustup target add x86_64-linux-android
rustup target add i686-linux-android
rustup target add armv7-linux-androideabi
- name: Set up ccache
uses: hendrikmuhs/ccache-action@v1.2
with:
@@ -74,12 +60,6 @@ jobs:
debugName=`ls module/build/outputs/release/ReZygisk-v*-debug.zip | awk -F '(/|.zip)' '{print $5}'` && echo "debugName=$debugName" >> $GITHUB_OUTPUT
unzip module/build/outputs/release/ReZygisk-v*-release.zip -d zksu-release
unzip module/build/outputs/release/ReZygisk-v*-debug.zip -d zksu-debug
releaseSymbolName="SYMBOLS-$releaseName.zip"
debugSymbolName="SYMBOLS-$debugName.zip"
echo "releaseSymbolName=$releaseSymbolName" >> $GITHUB_OUTPUT
echo "debugSymbolName=$debugSymbolName" >> $GITHUB_OUTPUT
zip -r $releaseSymbolName zygiskd/build/symbols/release
zip -r $debugSymbolName zygiskd/build/symbols/debug
- name: Upload release
uses: actions/upload-artifact@v4
@@ -92,16 +72,3 @@ jobs:
with:
name: ${{ steps.prepareArtifact.outputs.debugName }}
path: "./zksu-debug/*"
- name: Upload release symbols
uses: actions/upload-artifact@v4
with:
name: ${{ steps.prepareArtifact.outputs.releaseName }}-symbols
path: "zygiskd/build/symbols/release"
- name: Upload debug symbols
uses: actions/upload-artifact@v4
with:
name: ${{ steps.prepareArtifact.outputs.debugName }}-symbols
path: "zygiskd/build/symbols/debug"

2
README.md
View File

@@ -77,4 +77,4 @@ It is mandatory to follow PerformanC's [Contribution Guidelines](https://github.
## License
ReZygisk is licensed majority under GPL, by Dr-TSNG, but also by BSD 2-Clause License for re-written code. You can read more about it on [Open Source Initiative](https://opensource.org/licenses/BSD-2-Clause).
ReZygisk is licensed majoritaly under GPL, by Dr-TSNG, but also AGPL 3.0, by The PerformanC Organization, for re-written code. You can read more about it on [Open Source Initiative](https://opensource.org/licenses/AGPL-3.0).

2
loader/build.gradle.kts
View File

@@ -33,7 +33,7 @@ val defaultCFlags = arrayOf(
)
val releaseFlags = arrayOf(
"-Oz", "-flto",
"-Ofast", "-flto=thin",
"-Wno-unused", "-Wno-unused-parameter",
"-fvisibility=hidden", "-fvisibility-inlines-hidden",
"-fno-unwind-tables", "-fno-asynchronous-unwind-tables",

426
loader/src/common/daemon.cpp
View File

@@ -1,221 +1,263 @@
#include <linux/un.h>
#include <sys/socket.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <dirent.h>
#include <fcntl.h>
#include "daemon.h"
#include "dl.h"
#include "socket_utils.h"
namespace zygiskd {
static std::string TMP_PATH;
void Init(const char *path) {
TMP_PATH = path;
static std::string TMP_PATH;
void Init(const char *path) {
TMP_PATH = path;
}
std::string GetTmpPath() {
return TMP_PATH;
}
int Connect(uint8_t retry) {
retry++;
int fd = socket(PF_UNIX, SOCK_STREAM | SOCK_CLOEXEC, 0);
struct sockaddr_un addr = {
.sun_family = AF_UNIX,
.sun_path = { 0 }
};
auto socket_path = TMP_PATH + kCPSocketName;
strcpy(addr.sun_path, socket_path.c_str());
socklen_t socklen = sizeof(addr);
while (--retry) {
int r = connect(fd, (struct sockaddr *)&addr, socklen);
if (r == 0) return fd;
if (retry) {
PLOGE("Retrying to connect to zygiskd, sleep 1s");
sleep(1);
}
}
std::string GetTmpPath() {
return TMP_PATH;
close(fd);
return -1;
}
bool PingHeartbeat() {
int fd = Connect(5);
if (fd == -1) {
PLOGE("Connect to zygiskd");
return false;
}
int Connect(uint8_t retry) {
int fd = socket(PF_UNIX, SOCK_STREAM | SOCK_CLOEXEC, 0);
struct sockaddr_un addr = {
.sun_family = AF_UNIX,
.sun_path = { 0 },
};
socket_utils::write_u8(fd, (uint8_t) SocketAction::PingHeartBeat);
auto socket_path = TMP_PATH + kCPSocketName;
strcpy(addr.sun_path, socket_path.c_str());
socklen_t socklen = sizeof(addr);
close(fd);
while (retry--) {
int r = connect(fd, reinterpret_cast<struct sockaddr*>(&addr), socklen);
if (r == 0) return fd;
if (retry) {
PLOGE("Retrying to connect to zygiskd, sleep 1s");
sleep(1);
}
}
return true;
}
int RequestLogcatFd() {
int fd = Connect(1);
if (fd == -1) {
PLOGE("RequestLogcatFd");
return -1;
}
socket_utils::write_u8(fd, (uint8_t) SocketAction::RequestLogcatFd);
return fd;
}
uint32_t GetProcessFlags(uid_t uid) {
int fd = Connect(1);
if (fd == -1) {
PLOGE("GetProcessFlags");
return 0;
}
socket_utils::write_u8(fd, (uint8_t) SocketAction::GetProcessFlags);
socket_utils::write_u32(fd, uid);
uint32_t res = socket_utils::read_u32(fd);
close(fd);
return res;
}
std::vector<Module> ReadModules() {
std::vector<Module> modules;
int fd = Connect(1);
if (fd == -1) {
PLOGE("ReadModules");
return modules;
}
socket_utils::write_u8(fd, (uint8_t) SocketAction::ReadModules);
size_t len = socket_utils::read_usize(fd);
for (size_t i = 0; i < len; i++) {
std::string name = socket_utils::read_string(fd);
int module_fd = socket_utils::recv_fd(fd);
modules.emplace_back(name, module_fd);
}
close(fd);
return modules;
}
int ConnectCompanion(size_t index) {
int fd = Connect(1);
if (fd == -1) {
PLOGE("ConnectCompanion");
return -1;
}
socket_utils::write_u8(fd, (uint8_t) SocketAction::RequestCompanionSocket);
socket_utils::write_usize(fd, index);
uint8_t res = socket_utils::read_u8(fd);
if (res == 1) return fd;
else {
close(fd);
return -1;
}
}
int GetModuleDir(size_t index) {
int fd = Connect(1);
if (fd == -1) {
PLOGE("GetModuleDir");
return -1;
}
socket_utils::write_u8(fd, (uint8_t) SocketAction::GetModuleDir);
socket_utils::write_usize(fd, index);
int nfd = socket_utils::recv_fd(fd);
close(fd);
return nfd;
}
void ZygoteRestart() {
int fd = Connect(1);
if (fd == -1) {
if (errno == ENOENT) LOGD("Could not notify ZygoteRestart (maybe it hasn't been created)");
else PLOGE("Could not notify ZygoteRestart");
return;
}
if (!socket_utils::write_u8(fd, (uint8_t) SocketAction::ZygoteRestart))
PLOGE("Failed to request ZygoteRestart");
close(fd);
}
void SystemServerStarted() {
int fd = Connect(1);
if (fd == -1) PLOGE("Failed to report system server started");
else {
if (!socket_utils::write_u8(fd, (uint8_t) SocketAction::SystemServerStarted))
PLOGE("Failed to report system server started");
}
close(fd);
}
void GetInfo(struct zygote_info *info) {
/* TODO: Optimize and avoid re-connect twice here */
int fd = Connect(1);
if (fd != -1) {
info->running = true;
socket_utils::write_u8(fd, (uint8_t) SocketAction::GetInfo);
int flags = socket_utils::read_u32(fd);
if (flags & (1 << 27)) {
info->root_impl = ZYGOTE_ROOT_IMPL_APATCH;
} else if (flags & (1 << 29)) {
info->root_impl = ZYGOTE_ROOT_IMPL_KERNELSU;
} else if (flags & (1 << 30)) {
info->root_impl = ZYGOTE_ROOT_IMPL_MAGISK;
} else {
info->root_impl = ZYGOTE_ROOT_IMPL_NONE;
}
info->pid = socket_utils::read_u32(fd);
info->modules = (struct zygote_modules *)malloc(sizeof(struct zygote_modules));
if (info->modules == NULL) {
info->modules->modules_count = 0;
close(fd);
return -1;
}
bool PingHeartbeat() {
UniqueFd fd = Connect(5);
if (fd == -1) {
PLOGE("Connect to zygiskd");
return false;
}
socket_utils::write_u8(fd, (uint8_t) SocketAction::PingHeartBeat);
return true;
}
return;
}
int RequestLogcatFd() {
int fd = Connect(1);
if (fd == -1) {
PLOGE("RequestLogcatFd");
return -1;
}
socket_utils::write_u8(fd, (uint8_t) SocketAction::RequestLogcatFd);
return fd;
}
info->modules->modules_count = socket_utils::read_usize(fd);
uint32_t GetProcessFlags(uid_t uid) {
UniqueFd fd = Connect(1);
if (fd == -1) {
PLOGE("GetProcessFlags");
return 0;
}
socket_utils::write_u8(fd, (uint8_t) SocketAction::GetProcessFlags);
socket_utils::write_u32(fd, uid);
if (info->modules->modules_count == 0) {
info->modules->modules = NULL;
return socket_utils::read_u32(fd);
}
close(fd);
std::vector<Module> ReadModules() {
std::vector<Module> modules;
UniqueFd fd = Connect(1);
if (fd == -1) {
PLOGE("ReadModules");
return modules;
}
socket_utils::write_u8(fd, (uint8_t) SocketAction::ReadModules);
size_t len = socket_utils::read_usize(fd);
for (size_t i = 0; i < len; i++) {
std::string name = socket_utils::read_string(fd);
int module_fd = socket_utils::recv_fd(fd);
modules.emplace_back(name, module_fd);
}
return modules;
}
return;
}
int ConnectCompanion(size_t index) {
int fd = Connect(1);
if (fd == -1) {
PLOGE("ConnectCompanion");
return -1;
}
socket_utils::write_u8(fd, (uint8_t) SocketAction::RequestCompanionSocket);
socket_utils::write_usize(fd, index);
if (socket_utils::read_u8(fd) == 1) {
return fd;
info->modules->modules = (char **)malloc(sizeof(char *) * info->modules->modules_count);
if (info->modules->modules == NULL) {
free(info->modules);
info->modules = NULL;
info->modules->modules_count = 0;
close(fd);
return;
}
for (size_t i = 0; i < info->modules->modules_count; i++) {
/* INFO by ThePedroo: Ugly solution to read with std::string existance (temporary) */
std::string name = socket_utils::read_string(fd);
char module_path[PATH_MAX];
snprintf(module_path, sizeof(module_path), "/data/adb/modules/%s/module.prop", name.c_str());
FILE *module_prop = fopen(module_path, "r");
if (module_prop == NULL) {
info->modules->modules[i] = strdup(name.c_str());
} else {
close(fd);
return -1;
}
}
char line[1024];
while (fgets(line, sizeof(line), module_prop) != NULL) {
if (strncmp(line, "name=", 5) == 0) {
info->modules->modules[i] = strndup(line + 5, strlen(line) - 6);
int GetModuleDir(size_t index) {
UniqueFd fd = Connect(1);
if (fd == -1) {
PLOGE("GetModuleDir");
return -1;
}
socket_utils::write_u8(fd, (uint8_t) SocketAction::GetModuleDir);
socket_utils::write_usize(fd, index);
return socket_utils::recv_fd(fd);
}
void ZygoteRestart() {
UniqueFd fd = Connect(1);
if (fd == -1) {
if (errno == ENOENT) {
LOGD("Could not notify ZygoteRestart (maybe it hasn't been created)");
} else {
PLOGE("Could not notify ZygoteRestart");
break;
}
return;
}
if (!socket_utils::write_u8(fd, (uint8_t) SocketAction::ZygoteRestart)) {
PLOGE("Failed to request ZygoteRestart");
}
}
void SystemServerStarted() {
UniqueFd fd = Connect(1);
if (fd == -1) {
PLOGE("Failed to report system server started");
} else {
if (!socket_utils::write_u8(fd, (uint8_t) SocketAction::SystemServerStarted)) {
PLOGE("Failed to report system server started");
}
}
}
void GetInfo(struct zygote_info *info) {
/* TODO: Optimize and avoid re-connect twice here */
int fd = Connect(1);
if (fd != -1) {
socket_utils::write_u8(fd, (uint8_t) SocketAction::GetInfo);
int flags = socket_utils::read_u32(fd);
if (flags & (1 << 27)) {
info->root_impl = ZYGOTE_ROOT_IMPL_APATCH;
} else if (flags & (1 << 29)) {
info->root_impl = ZYGOTE_ROOT_IMPL_KERNELSU;
} else if (flags & (1 << 30)) {
info->root_impl = ZYGOTE_ROOT_IMPL_MAGISK;
} else {
info->root_impl = ZYGOTE_ROOT_IMPL_NONE;
}
info->modules = (struct zygote_modules *)malloc(sizeof(struct zygote_modules));
if (info->modules == NULL) {
info->modules->modules_count = 0;
close(fd);
return;
}
info->modules->modules_count = socket_utils::read_usize(fd);
if (info->modules->modules_count == 0) {
info->modules->modules = NULL;
close(fd);
return;
}
info->modules->modules = (char **)malloc(sizeof(char *) * info->modules->modules_count);
if (info->modules->modules == NULL) {
free(info->modules);
info->modules = NULL;
info->modules->modules_count = 0;
close(fd);
return;
}
for (size_t i = 0; i < info->modules->modules_count; i++) {
/* INFO by ThePedroo: Ugly solution to read with std::string existance (temporary) */
std::string name = socket_utils::read_string(fd);
char module_path[PATH_MAX];
snprintf(module_path, sizeof(module_path), "/data/adb/modules/%s/module.prop", name.c_str());
FILE *module_prop = fopen(module_path, "r");
if (module_prop == NULL) {
info->modules->modules[i] = strdup(name.c_str());
} else {
char line[1024];
while (fgets(line, sizeof(line), module_prop) != NULL) {
if (strncmp(line, "name=", 5) == 0) {
info->modules->modules[i] = strndup(line + 5, strlen(line) - 6);
break;
}
}
fclose(module_prop);
}
}
close(fd);
} else info->running = false;
}
fclose(module_prop);
}
}
close(fd);
} else info->running = false;
}
}

210
loader/src/common/socket_utils.cpp
View File

@@ -5,131 +5,133 @@
#include "socket_utils.h"
namespace socket_utils {
ssize_t xread(int fd, void* buf, size_t count) {
size_t read_sz = 0;
ssize_t ret;
do {
ret = read(fd, (std::byte*) buf + read_sz, count - read_sz);
if (ret < 0) {
if (errno == EINTR) continue;
PLOGE("read");
return ret;
}
read_sz += ret;
} while (read_sz != count && ret != 0);
if (read_sz != count) {
PLOGE("read (%zu != %zu)", count, read_sz);
}
return read_sz;
}
ssize_t xread(int fd, void* buf, size_t count) {
size_t read_sz = 0;
ssize_t ret;
do {
ret = read(fd, (std::byte*) buf + read_sz, count - read_sz);
if (ret < 0) {
if (errno == EINTR) continue;
PLOGE("read");
return ret;
}
read_sz += ret;
} while (read_sz != count && ret != 0);
if (read_sz != count) {
PLOGE("read (%zu != %zu)", count, read_sz);
size_t xwrite(int fd, const void* buf, size_t count) {
size_t write_sz = 0;
ssize_t ret;
do {
ret = write(fd, (std::byte*) buf + write_sz, count - write_sz);
if (ret < 0) {
if (errno == EINTR) continue;
PLOGE("write");
return write_sz;
}
return read_sz;
write_sz += ret;
} while (write_sz != count && ret != 0);
if (write_sz != count) {
PLOGE("write (%zu != %zu)", count, write_sz);
}
return write_sz;
}
size_t xwrite(int fd, const void* buf, size_t count) {
size_t write_sz = 0;
ssize_t ret;
do {
ret = write(fd, (std::byte*) buf + write_sz, count - write_sz);
if (ret < 0) {
if (errno == EINTR) continue;
PLOGE("write");
return write_sz;
}
write_sz += ret;
} while (write_sz != count && ret != 0);
if (write_sz != count) {
PLOGE("write (%zu != %zu)", count, write_sz);
}
return write_sz;
}
ssize_t xrecvmsg(int sockfd, struct msghdr* msg, int flags) {
int rec = recvmsg(sockfd, msg, flags);
if (rec < 0) PLOGE("recvmsg");
return rec;
}
ssize_t xrecvmsg(int sockfd, struct msghdr* msg, int flags) {
int rec = recvmsg(sockfd, msg, flags);
if (rec < 0) PLOGE("recvmsg");
return rec;
}
template<typename T>
inline T read_exact_or(int fd, T fail) {
T res;
return sizeof(T) == xread(fd, &res, sizeof(T)) ? res : fail;
}
void* recv_fds(int sockfd, char* cmsgbuf, size_t bufsz, int cnt) {
iovec iov = {
.iov_base = &cnt,
.iov_len = sizeof(cnt),
};
msghdr msg = {
.msg_iov = &iov,
.msg_iovlen = 1,
.msg_control = cmsgbuf,
.msg_controllen = bufsz
};
template<typename T>
inline bool write_exact(int fd, T val) {
return sizeof(T) == xwrite(fd, &val, sizeof(T));
}
xrecvmsg(sockfd, &msg, MSG_WAITALL);
cmsghdr* cmsg = CMSG_FIRSTHDR(&msg);
uint8_t read_u8(int fd) {
return read_exact_or<uint8_t>(fd, 0);
}
if (msg.msg_controllen != bufsz ||
cmsg == nullptr ||
// TODO: pass from rust: 20, expected: 16
// cmsg->cmsg_len != CMSG_LEN(sizeof(int) * cnt) ||
cmsg->cmsg_level != SOL_SOCKET ||
cmsg->cmsg_type != SCM_RIGHTS) {
return nullptr;
}
uint32_t read_u32(int fd) {
return read_exact_or<uint32_t>(fd, 0);
}
return CMSG_DATA(cmsg);
}
size_t read_usize(int fd) {
return read_exact_or<size_t>(fd, 0);
}
template<typename T>
inline T read_exact_or(int fd, T fail) {
T res;
return sizeof(T) == xread(fd, &res, sizeof(T)) ? res : fail;
}
bool write_usize(int fd, size_t val) {
return write_exact<size_t>(fd, val);
}
template<typename T>
inline bool write_exact(int fd, T val) {
return sizeof(T) == xwrite(fd, &val, sizeof(T));
}
std::string read_string(int fd) {
size_t len = read_usize(fd);
uint8_t read_u8(int fd) {
return read_exact_or<uint8_t>(fd, 0);
}
char buf[len + 1];
xread(fd, buf, len);
uint32_t read_u32(int fd) {
return read_exact_or<uint32_t>(fd, 0);
}
buf[len] = '\0';
size_t read_usize(int fd) {
return read_exact_or<size_t>(fd, 0);
}
return buf;
}
bool write_usize(int fd, size_t val) {
return write_exact<size_t>(fd, val);
}
bool write_u8(int fd, uint8_t val) {
return write_exact<uint8_t>(fd, val);
}
std::string read_string(int fd) {
auto len = read_usize(fd);
char buf[len + 1];
buf[len] = '\0';
xread(fd, buf, len);
return buf;
}
void* recv_fds(int sockfd, char* cmsgbuf, size_t bufsz, int cnt) {
iovec iov = {
.iov_base = &cnt,
.iov_len = sizeof(cnt),
};
msghdr msg = {
.msg_iov = &iov,
.msg_iovlen = 1,
.msg_control = cmsgbuf,
.msg_controllen = bufsz
};
bool write_u8(int fd, uint8_t val) {
return write_exact<uint8_t>(fd, val);
}
xrecvmsg(sockfd, &msg, MSG_WAITALL);
cmsghdr* cmsg = CMSG_FIRSTHDR(&msg);
bool write_u32(int fd, uint32_t val) {
return write_exact<uint32_t>(fd, val);
}
if (msg.msg_controllen != bufsz ||
cmsg == nullptr ||
// TODO: pass from rust: 20, expected: 16
// cmsg->cmsg_len != CMSG_LEN(sizeof(int) * cnt) ||
cmsg->cmsg_level != SOL_SOCKET ||
cmsg->cmsg_type != SCM_RIGHTS) {
return nullptr;
}
bool write_string(int fd, std::string_view str) {
return write_usize(fd, str.size()) && str.size() == xwrite(fd, str.data(), str.size());
}
return CMSG_DATA(cmsg);
}
int recv_fd(int sockfd) {
char cmsgbuf[CMSG_SPACE(sizeof(int))];
char cmsgbuf[CMSG_SPACE(sizeof(int))];
void* data = recv_fds(sockfd, cmsgbuf, sizeof(cmsgbuf), 1);
if (data == nullptr) return -1;
void* data = recv_fds(sockfd, cmsgbuf, sizeof(cmsgbuf), 1);
if (data == nullptr) return -1;
int result;
memcpy(&result, data, sizeof(int));
return result;
}
int result;
memcpy(&result, data, sizeof(int));
return result;
}
bool write_u32(int fd, uint32_t val) {
return write_exact<uint32_t>(fd, val);
}
bool write_string(int fd, std::string_view str) {
return write_usize(fd, str.size()) && str.size() == xwrite(fd, str.data(), str.size());
}
}

2
loader/src/include/solist.hpp
View File

@@ -62,7 +62,7 @@ namespace SoList
for (auto *iter = solist; iter; iter = iter->get_next()) {
if (iter->get_name() && iter->get_path() && strstr(iter->get_path(), target_name)) {
iter->nullify_path();
LOGI("Cleared SOList entry for %s\n", target_name);
LOGI("Cleared SOList entry for %s", target_name);
}
}

36
loader/src/injector/hook.cpp
View File

@@ -184,7 +184,7 @@ DCL_HOOK_FUNC(int, pthread_attr_destroy, void *target) {
if (gettid() != getpid())
return res;
LOGV("pthread_attr_destroy\n");
LOGV("pthread_attr_destroy");
if (should_unmap_zygisk) {
unhook_functions();
if (should_unmap_zygisk) {
@@ -202,7 +202,7 @@ void initialize_jni_hook();
DCL_HOOK_FUNC(char *, strdup, const char *s) {
if (strcmp(s, "com.android.internal.os.ZygoteInit") == 0) {
LOGV("strdup %s\n", s);
LOGV("strdup %s", s);
initialize_jni_hook();
}
@@ -271,7 +271,7 @@ void initialize_jni_hook() {
if (!map.path.ends_with("/libnativehelper.so")) continue;
void *h = dlopen(map.path.data(), RTLD_LAZY);
if (!h) {
LOGW("cannot dlopen libnativehelper.so: %s\n", dlerror());
LOGW("cannot dlopen libnativehelper.so: %s", dlerror());
break;
}
get_created_java_vms = reinterpret_cast<decltype(get_created_java_vms)>(dlsym(h, "JNI_GetCreatedJavaVMs"));
@@ -279,7 +279,7 @@ void initialize_jni_hook() {
break;
}
if (!get_created_java_vms) {
LOGW("JNI_GetCreatedJavaVMs not found\n");
LOGW("JNI_GetCreatedJavaVMs not found");
return;
}
}
@@ -585,7 +585,7 @@ void ZygiskContext::run_modules_post() {
// Remove from SoList to avoid detection
bool solist_res = SoList::Initialize();
if (!solist_res) {
LOGE("Failed to initialize SoList\n");
LOGE("Failed to initialize SoList");
} else {
SoList::NullifySoName("jit-cache");
}
@@ -599,7 +599,7 @@ void ZygiskContext::run_modules_post() {
// MAP_SHARED should fix the suspicious mapping.
void *copy = mmap(nullptr, size, PROT_WRITE, MAP_ANONYMOUS | MAP_SHARED, -1, 0);
if (copy == MAP_FAILED) {
LOGE("Failed to mmap jit-cache-zygisk\n");
LOGE("Failed to mmap jit-cache-zygisk");
continue;
}
@@ -674,7 +674,7 @@ void ZygiskContext::app_specialize_pre() {
}
if ((info_flags & (PROCESS_IS_MANAGER | PROCESS_ROOT_IS_MAGISK)) == (PROCESS_IS_MANAGER | PROCESS_ROOT_IS_MAGISK)) {
LOGI("Manager process detected. Notifying that Zygisk has been enabled.\n");
LOGI("Manager process detected. Notifying that Zygisk has been enabled.");
setenv("ZYGISK_ENABLED", "1", 1);
} else {
@@ -705,20 +705,20 @@ bool ZygiskContext::exempt_fd(int fd) {
void ZygiskContext::nativeSpecializeAppProcess_pre() {
process = env->GetStringUTFChars(args.app->nice_name, nullptr);
LOGV("pre specialize [%s]\n", process);
LOGV("pre specialize [%s]", process);
// App specialize does not check FD
flags[SKIP_FD_SANITIZATION] = true;
app_specialize_pre();
}
void ZygiskContext::nativeSpecializeAppProcess_post() {
LOGV("post specialize [%s]\n", process);
LOGV("post specialize [%s]", process);
app_specialize_post();
}
/* Zygisksu changed: No system_server status write back */
void ZygiskContext::nativeForkSystemServer_pre() {
LOGV("pre forkSystemServer\n");
LOGV("pre forkSystemServer");
flags[SERVER_FORK_AND_SPECIALIZE] = true;
fork_pre();
@@ -733,7 +733,7 @@ void ZygiskContext::nativeForkSystemServer_pre() {
void ZygiskContext::nativeForkSystemServer_post() {
if (pid == 0) {
LOGV("post forkSystemServer\n");
LOGV("post forkSystemServer");
run_modules_post();
}
fork_post();
@@ -741,7 +741,7 @@ void ZygiskContext::nativeForkSystemServer_post() {
void ZygiskContext::nativeForkAndSpecialize_pre() {
process = env->GetStringUTFChars(args.app->nice_name, nullptr);
LOGV("pre forkAndSpecialize [%s]\n", process);
LOGV("pre forkAndSpecialize [%s]", process);
flags[APP_FORK_AND_SPECIALIZE] = true;
/* Zygisksu changed: No args.app->fds_to_ignore check since we are Android 10+ */
@@ -758,7 +758,7 @@ void ZygiskContext::nativeForkAndSpecialize_pre() {
void ZygiskContext::nativeForkAndSpecialize_post() {
if (pid == 0) {
LOGV("post forkAndSpecialize [%s]\n", process);
LOGV("post forkAndSpecialize [%s]", process);
app_specialize_post();
}
fork_post();
@@ -780,7 +780,7 @@ ZygiskContext::~ZygiskContext() {
if (!methods.empty() && env->RegisterNatives(
env->FindClass(clz.data()), methods.data(),
static_cast<int>(methods.size())) != 0) {
LOGE("Failed to restore JNI hook of class [%s]\n", clz.data());
LOGE("Failed to restore JNI hook of class [%s]", clz.data());
should_unmap_zygisk = false;
}
}
@@ -801,14 +801,14 @@ static bool hook_commit() {
if (lsplt::CommitHook()) {
return true;
} else {
LOGE("plt_hook failed\n");
LOGE("plt_hook failed");
return false;
}
}
static void hook_register(dev_t dev, ino_t inode, const char *symbol, void *new_func, void **old_func) {
if (!lsplt::RegisterHook(dev, inode, symbol, new_func, old_func)) {
LOGE("Failed to register plt_hook \"%s\"\n", symbol);
LOGE("Failed to register plt_hook \"%s\"", symbol);
return;
}
plt_hook_list->emplace_back(dev, inode, symbol, old_func);
@@ -872,12 +872,12 @@ static void unhook_functions() {
// Unhook plt_hook
for (const auto &[dev, inode, sym, old_func] : *plt_hook_list) {
if (!lsplt::RegisterHook(dev, inode, sym, *old_func, nullptr)) {
LOGE("Failed to register plt_hook [%s]\n", sym);
LOGE("Failed to register plt_hook [%s]", sym);
}
}
delete plt_hook_list;
if (!hook_commit()) {
LOGE("Failed to restore plt_hook\n");
LOGE("Failed to restore plt_hook");
should_unmap_zygisk = false;
}
}

142
loader/src/ptracer/monitor.cpp
View File

@@ -2,7 +2,6 @@
#include <sys/system_properties.h>
#include <unistd.h>
#include <map>
#include <set>
#include <sys/signalfd.h>
#include <err.h>
@@ -165,13 +164,10 @@ struct SocketHandler : public EventHandler {
};
while (1) {
std::vector<uint8_t> buf;
buf.resize(sizeof(MsgHead), 0);
MsgHead &msg = *((MsgHead *)buf.data());
struct MsgHead *msg = (struct MsgHead *)malloc(sizeof(struct MsgHead));
ssize_t real_size;
ssize_t nread = recv(sock_fd_, &msg, sizeof(msg), MSG_PEEK);
ssize_t nread = recv(sock_fd_, msg, sizeof(struct MsgHead), MSG_PEEK);
if (nread == -1) {
if (errno == EAGAIN) break;
@@ -183,17 +179,17 @@ struct SocketHandler : public EventHandler {
continue;
}
if (msg.cmd >= Command::DAEMON64_SET_INFO && msg.cmd != Command::SYSTEM_SERVER_STARTED) {
if (msg->cmd >= Command::DAEMON64_SET_INFO && msg->cmd != Command::SYSTEM_SERVER_STARTED) {
if (nread != sizeof(msg)) {
LOGE("cmd %d size %zu != %zu", msg.cmd, nread, sizeof(MsgHead));
LOGE("cmd %d size %zu != %zu", msg->cmd, nread, sizeof(MsgHead));
continue;
}
real_size = sizeof(MsgHead) + msg.length;
real_size = sizeof(MsgHead) + msg->length;
} else {
if (nread != sizeof(Command)) {
LOGE("cmd %d size %zu != %zu", msg.cmd, nread, sizeof(Command));
LOGE("cmd %d size %zu != %zu", msg->cmd, nread, sizeof(Command));
continue;
}
@@ -201,8 +197,8 @@ struct SocketHandler : public EventHandler {
real_size = sizeof(Command);
}
buf.resize(real_size);
nread = recv(sock_fd_, &msg, real_size, 0);
msg = (struct MsgHead *)realloc(msg, real_size);
nread = recv(sock_fd_, msg, real_size, 0);
if (nread == -1) {
if (errno == EAGAIN) break;
@@ -217,7 +213,7 @@ struct SocketHandler : public EventHandler {
continue;
}
switch (msg.cmd) {
switch (msg->cmd) {
case START: {
if (tracing_state == STOPPING) tracing_state = TRACING;
else if (tracing_state == STOPPED) {
@@ -271,7 +267,7 @@ struct SocketHandler : public EventHandler {
break;
}
case DAEMON64_SET_INFO: {
LOGD("received daemon64 info %s", msg.data);
LOGD("received daemon64 info %s", msg->data);
/* Will only happen if somehow the daemon restarts */
if (status64.daemon_info != NULL) {
@@ -279,32 +275,42 @@ struct SocketHandler : public EventHandler {
status64.daemon_info = NULL;
}
status64.daemon_info = (char *)malloc(msg.length);
memcpy(status64.daemon_info, msg.data, msg.length - 1);
status64.daemon_info[msg.length - 1] = '\0';
status64.daemon_info = (char *)malloc(msg->length);
if (status64.daemon_info == NULL) {
PLOGE("malloc daemon64 info");
break;
}
strcpy(status64.daemon_info, msg->data);
updateStatus();
break;
}
case DAEMON32_SET_INFO: {
LOGD("received daemon32 info %s", msg.data);
LOGD("received daemon32 info %s", msg->data);
if (status32.daemon_info != NULL) {
free(status32.daemon_info);
status32.daemon_info = NULL;
}
status32.daemon_info = (char *)malloc(msg.length);
memcpy(status32.daemon_info, msg.data, msg.length - 1);
status32.daemon_info[msg.length - 1] = '\0';
status32.daemon_info = (char *)malloc(msg->length);
if (status32.daemon_info == NULL) {
PLOGE("malloc daemon32 info");
break;
}
strcpy(status32.daemon_info, msg->data);
updateStatus();
break;
}
case DAEMON64_SET_ERROR_INFO: {
LOGD("received daemon64 error info %s", msg.data);
LOGD("received daemon64 error info %s", msg->data);
status64.daemon_running = false;
@@ -313,16 +319,21 @@ struct SocketHandler : public EventHandler {
status64.daemon_error_info = NULL;
}
status64.daemon_error_info = (char *)malloc(msg.length);
memcpy(status64.daemon_error_info, msg.data, msg.length - 1);
status64.daemon_error_info[msg.length - 1] = '\0';
status64.daemon_error_info = (char *)malloc(msg->length);
if (status64.daemon_error_info == NULL) {
PLOGE("malloc daemon64 error info");
break;
}
strcpy(status64.daemon_error_info, msg->data);
updateStatus();
break;
}
case DAEMON32_SET_ERROR_INFO: {
LOGD("received daemon32 error info %s", msg.data);
LOGD("received daemon32 error info %s", msg->data);
status32.daemon_running = false;
@@ -331,9 +342,14 @@ struct SocketHandler : public EventHandler {
status32.daemon_error_info = NULL;
}
status32.daemon_error_info = (char *)malloc(msg.length);
memcpy(status32.daemon_error_info, msg.data, msg.length - 1);
status32.daemon_error_info[msg.length - 1] = '\0';
status32.daemon_error_info = (char *)malloc(msg->length);
if (status32.daemon_error_info == NULL) {
PLOGE("malloc daemon32 error info");
break;
}
strcpy(status32.daemon_error_info, msg->data);
updateStatus();
@@ -349,6 +365,8 @@ struct SocketHandler : public EventHandler {
break;
}
}
free(msg);
}
}
@@ -419,19 +437,27 @@ static bool ensure_daemon_created(bool is_64bit) {
}
}
#define CHECK_DAEMON_EXIT(abi) \
if (status##abi.supported && pid == status64.daemon_pid) { \
char status_str[64]; \
parse_status(status, status_str, sizeof(status_str)); \
\
LOGW("daemon" #abi "pid %d exited: %s", pid, status_str); \
status##abi.daemon_running = false; \
\
if (status##abi.daemon_error_info[0] == '\0') \
memcpy(status##abi.daemon_error_info, status_str, strlen(status_str)); \
\
updateStatus(); \
continue; \
#define CHECK_DAEMON_EXIT(abi) \
if (status##abi.supported && pid == status64.daemon_pid) { \
char status_str[64]; \
parse_status(status, status_str, sizeof(status_str)); \
\
LOGW("daemon" #abi " pid %d exited: %s", pid, status_str); \
status##abi.daemon_running = false; \
\
if (!status##abi.daemon_error_info) { \
status##abi.daemon_error_info = (char *)malloc(strlen(status_str) + 1); \
if (status##abi.daemon_error_info) { \
LOGE("malloc daemon" #abi " error info failed"); \
\
return; \
} \
\
memcpy(status##abi.daemon_error_info, status_str, strlen(status_str) + 1); \
} \
\
updateStatus(); \
continue; \
}
#define PRE_INJECT(abi, is_64) \
@@ -657,14 +683,14 @@ static char post_section[1024];
#define WRITE_STATUS_ABI(suffix) \
if (status ## suffix.supported) { \
strcat(status_text, " zygote" # suffix ":"); \
strcat(status_text, " zygote" # suffix ": "); \
if (tracing_state != TRACING) strcat(status_text, "❓ unknown, "); \
else if (status ## suffix.zygote_injected) strcat(status_text, "😋 injected, "); \
else strcat(status_text, "❌ not injected, "); \
\
strcat(status_text, " daemon" # suffix ":"); \
strcat(status_text, "daemon" # suffix ": "); \
if (status ## suffix.daemon_running) { \
strcat(status_text, "😋running"); \
strcat(status_text, "😋 running "); \
\
if (status ## suffix.daemon_info != NULL) { \
strcat(status_text, "("); \
@@ -706,7 +732,7 @@ static void updateStatus() {
}
if (tracing_state != TRACING && monitor_stop_reason[0] != '\0') {
strcat(status_text, "(");
strcat(status_text, " (");
strcat(status_text, monitor_stop_reason);
strcat(status_text, ")");
}
@@ -804,26 +830,27 @@ static bool prepare_environment() {
return false;
}
const char field_name[] = "description=";
int pre_section_len = 0;
int post_section_len = 0;
bool after_description = false;
char line[1024];
while (fgets(line, sizeof(line), orig_prop) != NULL) {
if (strstr(line, field_name) == line) {
strncat(pre_section, "description=", sizeof(pre_section) - pre_section_len);
if (strncmp(line, "description=", strlen("description=")) == 0) {
strcat(pre_section, "description=");
strcat(post_section, line + strlen("description="));
after_description = true;
pre_section_len += strlen("description=");
} else {
strncat(post_section, line, sizeof(post_section) - post_section_len);
post_section_len += strlen(line);
continue;
}
if (after_description) strcat(post_section, line);
else strcat(pre_section, line);
}
fclose(orig_prop);
/* TODO: See if ZYGISK_ENABLED flag is already set,
if so, set a status saying to disable built-in Zygisk. */
A
updateStatus();
return true;
@@ -831,7 +858,6 @@ static bool prepare_environment() {
void init_monitor() {
LOGI("ReZygisk %s", ZKSU_VERSION);
LOGI("init monitor started");
if (!prepare_environment()) exit(1);

19
loader/src/ptracer/ptracer.cpp
View File

@@ -100,7 +100,12 @@ bool inject_on_main(int pid, const char *lib_path) {
For arm32 compatibility, we set the last bit to the same as the entry address
*/
uintptr_t break_addr = (-0x05ec1cff & ~1) | ((uintptr_t)entry_addr & 1);
/* INFO: (-0x0F & ~1) is a value below zero, while the one after "|"
is an unsigned (must be 0 or greater) value, so we must
cast the second value to signed long (intptr_t) to avoid
undefined behavior.
*/
uintptr_t break_addr = (uintptr_t)((intptr_t)(-0x0F & ~1) | (intptr_t)((uintptr_t)entry_addr & 1));
if (!write_proc(pid, (uintptr_t)addr_of_entry_addr, &break_addr, sizeof(break_addr))) return false;
ptrace(PTRACE_CONT, pid, 0, 0);
@@ -110,7 +115,7 @@ bool inject_on_main(int pid, const char *lib_path) {
if (WIFSTOPPED(status) && WSTOPSIG(status) == SIGSEGV) {
if (!get_regs(pid, regs)) return false;
if (static_cast<uintptr_t>(regs.REG_IP & ~1) != (break_addr & ~1)) {
if (((int)regs.REG_IP & ~1) != ((int)break_addr & ~1)) {
LOGE("stopped at unknown addr %p", (void *) regs.REG_IP);
return false;
@@ -184,8 +189,14 @@ bool inject_on_main(int pid, const char *lib_path) {
}
/* NOTICE: C++ -> C */
char *err = (char *)malloc(dlerror_len + 1);
read_proc(pid, (uintptr_t) dlerror_str_addr, err, dlerror_len);
char *err = (char *)malloc((dlerror_len + 1) * sizeof(char));
if (err == NULL) {
LOGE("malloc err");
return false;
}
read_proc(pid, dlerror_str_addr, err, dlerror_len + 1);
LOGE("dlerror info %s", err);

6
loader/src/ptracer/utils.cpp
View File

@@ -313,7 +313,11 @@ void *find_func_addr(std::vector<MapInfo> &local_info, std::vector<MapInfo> &rem
/* WARNING: C++ keyword */
void align_stack(struct user_regs_struct &regs, long preserve) {
regs.REG_SP = (regs.REG_SP - preserve) & ~0xf;
/* INFO: ~0xf is a negative value, and REG_SP is unsigned,
so we must cast REG_SP to signed type before subtracting
then cast back to unsigned type.
*/
regs.REG_SP = (uintptr_t)((intptr_t)(regs.REG_SP - preserve) & ~0xf);
}
/* WARNING: C++ keyword */

3
module/build.gradle.kts
View File

@@ -80,7 +80,7 @@ androidComponents.onVariants { variant ->
filter<FixCrLfFilter>("eol" to FixCrLfFilter.CrLf.newInstance("lf"))
}
into("bin") {
from(project(":zygiskd").layout.buildDirectory.file("rustJniLibs/android"))
from(project(":zygiskd").layout.buildDirectory.getAsFile().get())
include("**/zygiskd")
}
into("lib") {
@@ -100,7 +100,6 @@ androidComponents.onVariants { variant ->
val privKey = kf.generatePrivate(privKeySpec);
val sig = Signature.getInstance("ed25519")
fun File.sha(realFile: File? = null) {
val path = this.path.replace("\\", "/")
sig.update(this.name.toByteArray())
sig.update(0) // null-terminated string
val real = realFile ?: this

3
zygiskd/.cargo/config.toml
View File

@@ -1,3 +0,0 @@
[build]
target-dir = "build/intermediates/rust"
target = "aarch64-linux-android"

37
zygiskd/Cargo.toml
View File

@@ -1,37 +0,0 @@
[package]
name = "zygiskd"
authors = ["Nullptr"]
version = "1.0.0"
edition = "2021"
rust-version = "1.69"
[dependencies]
csv = "1.3.0"
serde = { version = "1.0.130", features = ["derive"] }
android_logger = "0.13"
anyhow = { version = "1.0", features = ["backtrace"] }
bitflags = { version = "2.3" }
const_format = "0.2"
futures = "0.3"
konst = "0.3"
lazy_static = "1.4"
libc = "0.2"
log = "0.4"
memfd = "0.6"
num_enum = "0.5"
passfd = "0.1"
proc-maps = "0.3"
rustix = { version = "0.38", features = [ "fs", "process", "mount", "net", "thread" ] }
tokio = { version = "1.28", features = ["full"] }
[profile.dev]
strip = false
panic = "abort"
[profile.release]
strip = false
debug = true
panic = "abort"
opt-level = "z"
lto = true

166
zygiskd/build.gradle.kts
View File

@@ -1,6 +1,21 @@
plugins {
alias(libs.plugins.agp.lib)
alias(libs.plugins.rust.android)
import java.nio.file.Paths
import org.gradle.internal.os.OperatingSystem
fun getLatestNDKPath(): String {
val android_home = System.getenv("ANDROID_HOME")
if (android_home == null) {
throw Exception("ANDROID_HOME not set")
}
val ndkPath = android_home + "/ndk"
val ndkDir = Paths.get(ndkPath)
if (!ndkDir.toFile().exists()) {
throw Exception("NDK not found at $ndkPath")
}
val ndkVersion = ndkDir.toFile().listFiles().filter { it.isDirectory }.map { it.name }.sorted().last()
return ndkPath + "/" + ndkVersion
}
val minAPatchVersion: Int by rootProject.extra
@@ -11,60 +26,95 @@ val verCode: Int by rootProject.extra
val verName: String by rootProject.extra
val commitHash: String by rootProject.extra
android.buildFeatures {
androidResources = false
buildConfig = false
val CStandardFlags = arrayOf(
"-D_GNU_SOURCE", "-std=c99", "-Wpedantic", "-Wall", "-Wextra", "-Werror",
"-Wformat", "-Wuninitialized", "-Wshadow", "-Wno-zero-length-array",
"-Wno-fixed-enum-extension", "-Iroot_impl", "-llog",
"-DMIN_APATCH_VERSION=$minAPatchVersion",
"-DMIN_KSU_VERSION=$minKsuVersion",
"-DMAX_KSU_VERSION=$maxKsuVersion",
"-DMIN_MAGISK_VERSION=$minMagiskVersion",
"-DZKSU_VERSION=\"$verName\""
)
val CFlagsRelease = arrayOf(
"-Wl,--strip-all", "-flto=thin", "-Ofast"
)
val CFlagsDebug = arrayOf(
"-g", "-O0"
)
val Files = arrayOf(
"root_impl/apatch.c",
"root_impl/common.c",
"root_impl/kernelsu.c",
"root_impl/magisk.c",
"companion.c",
"dl.c",
"main.c",
"utils.c",
"zygiskd.c"
)
task("buildAndStrip") {
group = "build"
description = "Build the native library and strip the debug symbols."
val isDebug = gradle.startParameter.taskNames.any { it.lowercase().contains("debug") }
doLast {
val ndkPath = getLatestNDKPath()
val aarch64Compiler = Paths.get(ndkPath, "toolchains", "llvm", "prebuilt", "linux-x86_64", "bin", "aarch64-linux-android34-clang").toString()
val armv7aCompiler = Paths.get(ndkPath, "toolchains", "llvm", "prebuilt", "linux-x86_64", "bin", "armv7a-linux-androideabi34-clang").toString()
val x86Compiler = Paths.get(ndkPath, "toolchains", "llvm", "prebuilt", "linux-x86_64", "bin", "i686-linux-android34-clang").toString()
val x86_64Compiler = Paths.get(ndkPath, "toolchains", "llvm", "prebuilt", "linux-x86_64", "bin", "x86_64-linux-android34-clang").toString()
if (!Paths.get(aarch64Compiler).toFile().exists()) {
throw Exception("aarch64 compiler not found at $aarch64Compiler")
}
if (!Paths.get(armv7aCompiler).toFile().exists()) {
throw Exception("armv7a compiler not found at $armv7aCompiler")
}
if (!Paths.get(x86Compiler).toFile().exists()) {
throw Exception("x86 compiler not found at $x86Compiler")
}
if (!Paths.get(x86_64Compiler).toFile().exists()) {
throw Exception("x86_64 compiler not found at $x86_64Compiler")
}
val Files = Files.map { Paths.get(project.projectDir.toString(), "src", it).toString() }.toTypedArray()
val buildDir = getLayout().getBuildDirectory().getAsFile().get()
buildDir.mkdirs()
val aarch64OutputDir = Paths.get(buildDir.toString(), "arm64-v8a").toFile()
val armv7aOutputDir = Paths.get(buildDir.toString(), "armeabi-v7a").toFile()
val x86OutputDir = Paths.get(buildDir.toString(), "x86").toFile()
val x86_64OutputDir = Paths.get(buildDir.toString(), "x86_64").toFile()
aarch64OutputDir.mkdirs()
armv7aOutputDir.mkdirs()
x86OutputDir.mkdirs()
x86_64OutputDir.mkdirs()
val compileArgs = (if (isDebug) CFlagsDebug else CFlagsRelease) + CStandardFlags
exec {
commandLine(aarch64Compiler, "-o", Paths.get(aarch64OutputDir.toString(), "zygiskd").toString(), *compileArgs, *Files)
}
exec {
commandLine(armv7aCompiler, "-o", Paths.get(armv7aOutputDir.toString(), "zygiskd").toString(), *compileArgs, *Files)
}
exec {
commandLine(x86Compiler, "-o", Paths.get(x86OutputDir.toString(), "zygiskd").toString(), *compileArgs, *Files)
}
exec {
commandLine(x86_64Compiler, "-o", Paths.get(x86_64OutputDir.toString(), "zygiskd").toString(), *compileArgs, *Files)
}
}
}
cargo {
module = "."
pythonCommand = "python3"
libname = "zygiskd"
targetIncludes = arrayOf("zygiskd")
targets = listOf("arm64", "arm", "x86", "x86_64")
targetDirectory = "build/intermediates/rust"
val isDebug = gradle.startParameter.taskNames.any { it.toLowerCase().contains("debug") }
profile = if (isDebug) "debug" else "release"
exec = { spec, _ ->
spec.environment("ANDROID_NDK_HOME", android.ndkDirectory.path)
spec.environment("MIN_APATCH_VERSION", minAPatchVersion)
spec.environment("MIN_KSU_VERSION", minKsuVersion)
spec.environment("MAX_KSU_VERSION", maxKsuVersion)
spec.environment("MIN_MAGISK_VERSION", minMagiskVersion)
spec.environment("ZKSU_VERSION", "$verName-$verCode-$commitHash-$profile")
}
}
afterEvaluate {
task<Task>("buildAndStrip") {
dependsOn(":zygiskd:cargoBuild")
val isDebug = gradle.startParameter.taskNames.any { it.toLowerCase().contains("debug") }
doLast {
val dir = File(buildDir, "rustJniLibs/android")
val prebuilt = File(android.ndkDirectory, "toolchains/llvm/prebuilt").listFiles()!!.first()
val binDir = File(prebuilt, "bin")
val symbolDir = File(buildDir, "symbols/${if (isDebug) "debug" else "release"}")
symbolDir.mkdirs()
val suffix = if (prebuilt.name.contains("windows")) ".exe" else ""
val strip = File(binDir, "llvm-strip$suffix")
val objcopy = File(binDir, "llvm-objcopy$suffix")
dir.listFiles()!!.forEach {
if (!it.isDirectory) return@forEach
val symbolPath = File(symbolDir, "${it.name}/zygiskd.debug")
symbolPath.parentFile.mkdirs()
exec {
workingDir = it
commandLine(objcopy, "--only-keep-debug", "zygiskd", symbolPath)
}
exec {
workingDir = it
commandLine(strip, "--strip-all", "zygiskd")
}
exec {
workingDir = it
commandLine(objcopy, "--add-gnu-debuglink", symbolPath, "zygiskd")
}
}
}
}
}

2
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zygiskd64
zygiskd32

661
zygiskd/src/LICENSE Normal file
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@@ -0,0 +1,661 @@
GNU AFFERO GENERAL PUBLIC LICENSE
Version 3, 19 November 2007
Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
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You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
Also add information on how to contact you by electronic and paper mail.
If your software can interact with users remotely through a computer
network, you should also make sure that it provides a way for users to
get its source. For example, if your program is a web application, its
interface could display a "Source" link that leads users to an archive
of the code. There are many ways you could offer source, and different
solutions will be better for different programs; see section 13 for the
specific requirements.
You should also get your employer (if you work as a programmer) or school,
if any, to sign a "copyright disclaimer" for the program, if necessary.
For more information on this, and how to apply and follow the GNU AGPL, see
<https://www.gnu.org/licenses/>.

134
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <dlfcn.h>
#include <errno.h>
#include <fcntl.h>
#include <unistd.h>
#include <linux/limits.h>
#include <pthread.h>
#include <android/log.h>
#include "companion.h"
#include "dl.h"
#include "utils.h"
typedef void (*zygisk_companion_entry_func)(int);
struct companion_module_thread_args {
int fd;
zygisk_companion_entry_func entry;
};
zygisk_companion_entry_func load_module(int fd) {
char path[PATH_MAX];
snprintf(path, sizeof(path), "/proc/self/fd/%d", fd);
void *handle = android_dlopen(path, RTLD_NOW);
void *entry = dlsym(handle, "zygisk_companion_entry");
if (entry == NULL) return NULL;
return (zygisk_companion_entry_func)entry;
}
void *entry_thread(void *arg) {
struct companion_module_thread_args *args = (struct companion_module_thread_args *)arg;
int fd = args->fd;
zygisk_companion_entry_func module_entry = args->entry;
module_entry(fd);
close(fd);
free(args);
pthread_exit(NULL);
}
/* WARNING: Dynamic memory based */
void companion_entry(int fd) {
LOGI("New companion entry.\n - Client fd: %d\n", fd);
/* TODO: Use non-NULL string termination */
char name[256 + 1];
ssize_t name_length = read_string(fd, name, sizeof(name) - 1);
if (name_length == -1) {
LOGE("Failed to read module name\n");
ssize_t ret = write_uint8_t(fd, 2);
ASSURE_SIZE_WRITE("ZygiskdCompanion", "name", ret, sizeof(uint8_t));
exit(0);
}
name[name_length] = '\0';
LOGI(" - Module name: `%.*s`\n", (int)name_length, name);
int library_fd = read_fd(fd);
ssize_t ret = 0;
if (library_fd == -1) {
LOGE("Failed to receive library fd\n");
ret = write_uint8_t(fd, 2);
ASSURE_SIZE_WRITE("ZygiskdCompanion", "library_fd", ret, sizeof(uint8_t));
exit(0);
}
LOGI(" - Library fd: %d\n", library_fd);
zygisk_companion_entry_func module_entry = load_module(library_fd);
close(library_fd);
if (module_entry == NULL) {
LOGI("No companion module entry for module: %.*s\n", (int)name_length, name);
ret = write_uint8_t(fd, 0);
ASSURE_SIZE_WRITE("ZygiskdCompanion", "module_entry", ret, sizeof(uint8_t));
exit(0);
} else {
ret = write_uint8_t(fd, 1);
ASSURE_SIZE_WRITE("ZygiskdCompanion", "module_entry", ret, sizeof(uint8_t));
}
while (1) {
if (!check_unix_socket(fd, true)) {
LOGI("Something went wrong in companion. Bye!\n");
exit(0);
break;
}
int client_fd = read_fd(fd);
if (fd == -1) {
LOGE("Failed to receive client fd\n");
exit(0);
}
struct companion_module_thread_args *args = malloc(sizeof(struct companion_module_thread_args));
if (args == NULL) {
LOGE("Failed to allocate memory for thread args\n");
exit(0);
}
args->fd = client_fd;
args->entry = module_entry;
LOGI("New companion request.\n - Module name: %.*s\n - Client fd: %d\n", (int)name_length, name, args->fd);
ret = write_uint8_t(args->fd, 1);
ASSURE_SIZE_WRITE("ZygiskdCompanion", "client_fd", ret, sizeof(uint8_t));
pthread_t thread;
pthread_create(&thread, NULL, entry_thread, args);
}
}

6
zygiskd/src/companion.h Normal file
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#ifndef COMPANION_H
#define COMPANION_H
void companion_entry(int fd);
#endif /* COMPANION_H */

73
zygiskd/src/companion.rs
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@@ -1,73 +0,0 @@
use crate::dl;
use crate::utils::{check_unix_socket, UnixStreamExt};
use anyhow::Result;
use passfd::FdPassingExt;
use rustix::fs::fstat;
use std::ffi::c_void;
use std::os::fd::{AsRawFd, FromRawFd, RawFd};
use std::os::unix::net::UnixStream;
use std::thread;
type ZygiskCompanionEntryFn = unsafe extern "C" fn(i32);
pub fn entry(fd: i32) {
log::info!("companion entry fd={}", fd);
let mut stream = unsafe { UnixStream::from_raw_fd(fd) };
let name = stream.read_string().expect("read name");
let library = stream.recv_fd().expect("receive library fd");
let entry = load_module(library).expect("load module");
unsafe { libc::close(library) };
let entry = match entry {
Some(entry) => {
log::debug!("Companion process created for `{name}`");
stream.write_u8(1).expect("reply 1");
entry
}
None => {
log::debug!("No companion entry for `{name}`");
stream.write_u8(0).expect("reply 0");
std::process::exit(0);
}
};
loop {
if !check_unix_socket(&stream, true) {
log::info!("Something bad happened in zygiskd, terminate companion");
std::process::exit(0);
}
let fd = stream.recv_fd().expect("recv fd");
log::trace!("New companion request from module `{name}` fd=`{fd}`");
let mut stream = unsafe { UnixStream::from_raw_fd(fd) };
stream.write_u8(1).expect("reply success");
thread::spawn(move || {
let st0 = fstat(&stream).expect("failed to stat stream");
unsafe {
entry(stream.as_raw_fd());
}
// Only close client if it is the same file so we don't
// accidentally close a re-used file descriptor.
// This check is required because the module companion
// handler could've closed the file descriptor already.
if let Ok(st1) = fstat(&stream) {
if st0.st_dev != st1.st_dev || st0.st_ino != st1.st_ino {
std::mem::forget(stream);
}
}
});
}
}
fn load_module(fd: RawFd) -> Result<Option<ZygiskCompanionEntryFn>> {
unsafe {
let path = format!("/proc/self/fd/{fd}");
let handle = dl::dlopen(&path, libc::RTLD_NOW)?;
let symbol = std::ffi::CString::new("zygisk_companion_entry")?;
let entry = libc::dlsym(handle, symbol.as_ptr());
if entry.is_null() {
return Ok(None);
}
let fnptr = std::mem::transmute::<*mut c_void, ZygiskCompanionEntryFn>(entry);
Ok(Some(fnptr))
}
}

57
zygiskd/src/constants.h Normal file
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#ifndef CONSTANTS_H
#define CONSTANTS_H
#include <android/log.h>
#define bool _Bool
#define true 1
#define false 0
#if DEBUG == false
#define MAX_LOG_LEVEL ANDROID_LOG_VERBOSE
#else
#define MAX_LOG_LEVEL ANDROID_LOG_INFO
#endif
#if (defined(__LP64__) || defined(_LP64))
#define lp_select(a, b) b
#else
#define lp_select(a, b) a
#endif
#define ZYGOTE_INJECTED lp_select(5, 4)
#define DAEMON_SET_INFO lp_select(7, 6)
#define DAEMON_SET_ERROR_INFO lp_select(9, 8)
#define SYSTEM_SERVER_STARTED 10
enum DaemonSocketAction {
PingHeartbeat,
RequestLogcatFd,
GetProcessFlags,
GetInfo,
ReadModules,
RequestCompanionSocket,
GetModuleDir,
ZygoteRestart,
SystemServerStarted
};
enum ProcessFlags: uint32_t {
PROCESS_GRANTED_ROOT = (1u << 0),
PROCESS_ON_DENYLIST = (1u << 1),
PROCESS_IS_MANAGER = (1u << 28),
PROCESS_ROOT_IS_APATCH = (1u << 27),
PROCESS_ROOT_IS_KSU = (1u << 29),
PROCESS_ROOT_IS_MAGISK = (1u << 30),
PROCESS_IS_SYS_UI = (1u << 31),
PROCESS_IS_SYSUI = (1u << 31)
};
enum RootImplState {
Supported,
TooOld,
Inexistent,
Abnormal
};
#endif /* CONSTANTS_H */

51
zygiskd/src/constants.rs
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@@ -1,51 +0,0 @@
use crate::lp_select;
use bitflags::bitflags;
use konst::primitive::parse_i32;
use konst::unwrap_ctx;
use log::LevelFilter;
use num_enum::TryFromPrimitive;
pub const MIN_APATCH_VERSION: i32 = unwrap_ctx!(parse_i32(env!("MIN_APATCH_VERSION")));
pub const MIN_KSU_VERSION: i32 = unwrap_ctx!(parse_i32(env!("MIN_KSU_VERSION")));
pub const MAX_KSU_VERSION: i32 = unwrap_ctx!(parse_i32(env!("MAX_KSU_VERSION")));
pub const MIN_MAGISK_VERSION: i32 = unwrap_ctx!(parse_i32(env!("MIN_MAGISK_VERSION")));
pub const ZKSU_VERSION: &str = env!("ZKSU_VERSION");
#[cfg(debug_assertions)]
pub const MAX_LOG_LEVEL: LevelFilter = LevelFilter::Trace;
#[cfg(not(debug_assertions))]
pub const MAX_LOG_LEVEL: LevelFilter = LevelFilter::Info;
pub const PATH_MODULES_DIR: &str = "..";
pub const ZYGOTE_INJECTED: i32 = lp_select!(5, 4);
pub const DAEMON_SET_INFO: i32 = lp_select!(7, 6);
pub const DAEMON_SET_ERROR_INFO: i32 = lp_select!(9, 8);
pub const SYSTEM_SERVER_STARTED: i32 = 10;
#[derive(Debug, Eq, PartialEq, TryFromPrimitive)]
#[repr(u8)]
pub enum DaemonSocketAction {
PingHeartbeat,
RequestLogcatFd,
GetProcessFlags,
GetInfo,
ReadModules,
RequestCompanionSocket,
GetModuleDir,
ZygoteRestart,
SystemServerStarted,
}
// Zygisk process flags
bitflags! {
#[derive(Clone, Copy, Debug, PartialEq, Eq, Hash)]
pub struct ProcessFlags: u32 {
const PROCESS_GRANTED_ROOT = 1 << 0;
const PROCESS_ON_DENYLIST = 1 << 1;
const PROCESS_IS_MANAGER = 1 << 28;
const PROCESS_ROOT_IS_APATCH = 1 << 27;
const PROCESS_ROOT_IS_KSU = 1 << 29;
const PROCESS_ROOT_IS_MAGISK = 1 << 30;
const PROCESS_IS_SYSUI = 1 << 31;
}
}

88
zygiskd/src/dl.c Normal file
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <dlfcn.h>
#include <errno.h>
#include <libgen.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdint.h>
#include <android/log.h>
#include "companion.h"
#include "dl.h"
#include "utils.h"
#define ANDROID_NAMESPACE_TYPE_SHARED 0x2
#define ANDROID_DLEXT_USE_NAMESPACE 0x200
typedef struct AndroidNamespace {
unsigned char _unused[0];
} AndroidNamespace;
typedef struct AndroidDlextinfo {
uint64_t flags;
void *reserved_addr;
size_t reserved_size;
int relro_fd;
int library_fd;
off64_t library_fd_offset;
AndroidNamespace *library_namespace;
} AndroidDlextinfo;
typedef AndroidNamespace *(*AndroidCreateNamespaceFn)(
const char *name,
const char *ld_library_path,
const char *default_library_path,
uint64_t type,
const char *permitted_when_isolated_path,
AndroidNamespace *parent,
const void *caller_addr
);
extern void *android_dlopen_ext(const char *filename, int flags, const AndroidDlextinfo *extinfo);
void *android_dlopen(char *path, int flags) {
char *dir = dirname(path);
struct AndroidDlextinfo info = {
.flags = 0,
.reserved_addr = NULL,
.reserved_size = 0,
.relro_fd = 0,
.library_fd = 0,
.library_fd_offset = 0,
.library_namespace = NULL,
};
void *handle = dlsym(RTLD_DEFAULT, "__loader_android_create_namespace");
AndroidCreateNamespaceFn android_create_namespace_fn = (AndroidCreateNamespaceFn)handle;
AndroidNamespace *ns = android_create_namespace_fn(
path,
dir,
NULL,
ANDROID_NAMESPACE_TYPE_SHARED,
NULL,
NULL,
(const void *)&android_dlopen
);
if (ns != NULL) {
info.flags = ANDROID_DLEXT_USE_NAMESPACE;
info.library_namespace = ns;
LOGI("Open %s with namespace %p\n", path, (void *)ns);
} else {
LOGI("Cannot create namespace for %s\n", path);
}
void *result = android_dlopen_ext(path, flags, &info);
if (result == NULL) {
LOGE("Failed to dlopen %s: %s\n", path, dlerror());
}
return result;
}

6
zygiskd/src/dl.h Normal file
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@@ -0,0 +1,6 @@
#ifndef DL_H
#define DL_H
void *android_dlopen(char *path, int flags);
#endif /* DL_H */

85
zygiskd/src/dl.rs
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@@ -1,85 +0,0 @@
use anyhow::{bail, Result};
use std::ffi::{c_char, c_void};
pub const ANDROID_NAMESPACE_TYPE_SHARED: u64 = 0x2;
pub const ANDROID_DLEXT_USE_NAMESPACE: u64 = 0x200;
#[repr(C)]
#[derive(Debug, Copy, Clone)]
pub struct AndroidNamespace {
_unused: [u8; 0],
}
#[repr(C)]
pub struct AndroidDlextinfo {
pub flags: u64,
pub reserved_addr: *mut c_void,
pub reserved_size: libc::size_t,
pub relro_fd: libc::c_int,
pub library_fd: libc::c_int,
pub library_fd_offset: libc::off64_t,
pub library_namespace: *mut AndroidNamespace,
}
extern "C" {
pub fn android_dlopen_ext(
filename: *const c_char,
flags: libc::c_int,
extinfo: *const AndroidDlextinfo,
) -> *mut c_void;
}
type AndroidCreateNamespaceFn = unsafe extern "C" fn(
*const c_char, // name
*const c_char, // ld_library_path
*const c_char, // default_library_path
u64, // type
*const c_char, // permitted_when_isolated_path
*mut AndroidNamespace, // parent
*const c_void, // caller_addr
) -> *mut AndroidNamespace;
pub unsafe fn dlopen(path: &str, flags: i32) -> Result<*mut c_void> {
let filename = std::ffi::CString::new(path)?;
let filename = filename.as_ptr() as *mut _;
let dir = libc::dirname(filename);
let mut info = AndroidDlextinfo {
flags: 0,
reserved_addr: std::ptr::null_mut(),
reserved_size: 0,
relro_fd: 0,
library_fd: 0,
library_fd_offset: 0,
library_namespace: std::ptr::null_mut(),
};
let android_create_namespace_fn = libc::dlsym(
libc::RTLD_DEFAULT,
std::ffi::CString::new("__loader_android_create_namespace")?.as_ptr(),
);
let android_create_namespace_fn: AndroidCreateNamespaceFn =
std::mem::transmute(android_create_namespace_fn);
let ns = android_create_namespace_fn(
filename,
dir,
std::ptr::null(),
ANDROID_NAMESPACE_TYPE_SHARED,
std::ptr::null(),
std::ptr::null_mut(),
&dlopen as *const _ as *const c_void,
);
if ns != std::ptr::null_mut() {
info.flags = ANDROID_DLEXT_USE_NAMESPACE;
info.library_namespace = ns;
log::debug!("Open {} with namespace {:p}", path, ns);
} else {
log::debug!("Cannot create namespace for {}", path);
};
let result = android_dlopen_ext(filename, flags, &info);
if result.is_null() {
let e = std::ffi::CStr::from_ptr(libc::dlerror()).to_string_lossy();
bail!(e);
}
Ok(result)
}

73
zygiskd/src/main.c Normal file
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <android/log.h>
#include "root_impl/common.h"
#include "companion.h"
#include "zygiskd.h"
#include "utils.h"
int __android_log_print(int prio, const char *tag, const char *fmt, ...);
int main(int argc, char *argv[]) {
#ifdef __LP64__
LOGI("Welcome to ReZygisk %s Zygiskd64!\n", ZKSU_VERSION);
#else
LOGI("Welcome to ReZygisk %s Zygiskd32!\n", ZKSU_VERSION);
#endif
if (argc > 1) {
if (strcmp(argv[1], "companion") == 0) {
if (argc < 3) {
LOGI("Usage: zygiskd companion <fd>\n");
return 1;
}
int fd = atoi(argv[2]);
companion_entry(fd);
return 0;
}
else if (strcmp(argv[1], "version") == 0) {
LOGI("ReZygisk Daemon %s\n", ZKSU_VERSION);
return 0;
}
else if (strcmp(argv[1], "root") == 0) {
root_impls_setup();
struct root_impl impl;
get_impl(&impl);
char impl_name[LONGEST_ROOT_IMPL_NAME];
stringify_root_impl_name(impl, impl_name);
LOGI("Root implementation: %s\n", impl_name);
return 0;
}
else {
LOGI("Usage: zygiskd [companion|version|root]\n");
return 0;
}
}
if (switch_mount_namespace((pid_t)1) == false) {
LOGE("Failed to switch mount namespace\n");
return 1;
}
root_impls_setup();
zygiskd_start(argv);
return 0;
}

45
zygiskd/src/main.rs
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@@ -1,45 +0,0 @@
mod companion;
mod constants;
mod dl;
mod root_impl;
mod utils;
mod zygiskd;
use crate::constants::ZKSU_VERSION;
fn init_android_logger(tag: &str) {
android_logger::init_once(
android_logger::Config::default()
.with_max_level(constants::MAX_LOG_LEVEL)
.with_tag(tag),
);
}
fn start() {
let args: Vec<String> = std::env::args().collect();
if args.len() == 3 && args[1] == "companion" {
let fd: i32 = args[2].parse().unwrap();
companion::entry(fd);
return;
} else if args.len() == 2 && args[1] == "version" {
println!("ReZygisk daemon {}", ZKSU_VERSION);
return;
} else if args.len() == 2 && args[1] == "root" {
root_impl::setup();
println!("root impl: {:?}", root_impl::get_impl());
return;
}
utils::switch_mount_namespace(1).expect("switch mnt ns");
root_impl::setup();
log::info!("current root impl: {:?}", root_impl::get_impl());
zygiskd::main().expect("zygiskd main");
}
fn main() {
let process = std::env::args().next().unwrap();
let nice_name = process.split('/').last().unwrap();
init_android_logger(nice_name);
start();
}

194
zygiskd/src/root_impl/apatch.c Normal file
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#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <unistd.h>
#include <errno.h>
#include "../constants.h"
#include "../utils.h"
#include "common.h"
#include "apatch.h"
void apatch_get_existence(struct root_impl_state *state) {
struct stat s;
if (stat("/data/adb/apd", &s) != 0) {
if (errno != ENOENT) {
LOGE("Failed to stat APatch apd binary: %s\n", strerror(errno));
}
errno = 0;
state->state = Inexistent;
return;
}
char *PATH = getenv("PATH");
if (PATH == NULL) {
LOGE("Failed to get PATH environment variable: %s\n", strerror(errno));
errno = 0;
state->state = Inexistent;
return;
}
if (strstr(PATH, "/data/adb/ap/bin") == NULL) {
LOGE("APatch's APD binary is not in PATH\n");
state->state = Inexistent;
return;
}
char apatch_version[32];
char *const argv[] = { "apd", "-V", NULL };
if (!exec_command(apatch_version, sizeof(apatch_version), "/data/adb/apd", argv)) {
LOGE("Failed to execute apd binary: %s\n", strerror(errno));
errno = 0;
state->state = Inexistent;
return;
}
int version = atoi(apatch_version + strlen("apd "));
if (version == 0) state->state = Abnormal;
else if (version >= MIN_APATCH_VERSION && version <= 999999) state->state = Supported;
else if (version >= 1 && version <= MIN_APATCH_VERSION - 1) state->state = TooOld;
else state->state = Abnormal;
}
struct package_config {
uid_t uid;
bool root_granted;
bool umount_needed;
};
struct packages_config {
struct package_config *configs;
size_t size;
};
/* WARNING: Dynamic memory based */
bool _apatch_get_package_config(struct packages_config *restrict config) {
config->configs = NULL;
config->size = 0;
FILE *fp = fopen("/data/adb/ap/package_config", "r");
if (fp == NULL) {
LOGE("Failed to open APatch's package_config: %s\n", strerror(errno));
return false;
}
char line[1048];
/* INFO: Skip the CSV header */
if (fgets(line, sizeof(line), fp) == NULL) {
LOGE("Failed to read APatch's package_config header: %s\n", strerror(errno));
fclose(fp);
return false;
}
while (fgets(line, sizeof(line), fp) != NULL) {
config->configs = realloc(config->configs, (config->size + 1) * sizeof(struct package_config));
if (config->configs == NULL) {
LOGE("Failed to realloc APatch config struct: %s\n", strerror(errno));
fclose(fp);
return false;
}
strtok(line, ",");
char *exclude_str = strtok(NULL, ",");
if (exclude_str == NULL) continue;
char *allow_str = strtok(NULL, ",");
if (allow_str == NULL) continue;
char *uid_str = strtok(NULL, ",");
if (uid_str == NULL) continue;
config->configs[config->size].uid = atoi(uid_str);
config->configs[config->size].root_granted = strcmp(allow_str, "1") == 0;
config->configs[config->size].umount_needed = strcmp(exclude_str, "1") == 0;
config->size++;
}
fclose(fp);
return true;
}
void _apatch_free_package_config(struct packages_config *restrict config) {
free(config->configs);
}
bool apatch_uid_granted_root(uid_t uid) {
struct packages_config config;
if (!_apatch_get_package_config(&config)) {
_apatch_free_package_config(&config);
return false;
}
for (size_t i = 0; i < config.size; i++) {
if (config.configs[i].uid != uid) continue;
/* INFO: This allow us to copy the information to avoid use-after-free */
bool root_granted = config.configs[i].root_granted;
_apatch_free_package_config(&config);
return root_granted;
}
_apatch_free_package_config(&config);
return false;
}
bool apatch_uid_should_umount(uid_t uid) {
struct packages_config config;
if (!_apatch_get_package_config(&config)) {
_apatch_free_package_config(&config);
return false;
}
for (size_t i = 0; i < config.size; i++) {
if (config.configs[i].uid != uid) continue;
/* INFO: This allow us to copy the information to avoid use-after-free */
bool umount_needed = config.configs[i].umount_needed;
_apatch_free_package_config(&config);
return umount_needed;
}
_apatch_free_package_config(&config);
return false;
}
bool apatch_uid_is_manager(uid_t uid) {
struct stat s;
if (stat("/data/user_de/0/me.bmax.apatch", &s) == -1) {
if (errno != ENOENT) {
LOGE("Failed to stat APatch manager data directory: %s\n", strerror(errno));
}
errno = 0;
return false;
}
return s.st_uid == uid;
}

14
zygiskd/src/root_impl/apatch.h Normal file
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@@ -0,0 +1,14 @@
#ifndef APATCH_H
#define APATCH_H
#include "../constants.h"
void apatch_get_existence(struct root_impl_state *state);
bool apatch_uid_granted_root(uid_t uid);
bool apatch_uid_should_umount(uid_t uid);
bool apatch_uid_is_manager(uid_t uid);
#endif

141
zygiskd/src/root_impl/apatch.rs
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@@ -1,141 +0,0 @@
use std::process::{Command, Stdio};
use std::fs::File;
use std::io::{self, BufRead, BufReader};
use serde::Deserialize;
use crate::constants::MIN_APATCH_VERSION;
pub enum Version {
Supported,
TooOld,
Abnormal,
}
fn parse_version(output: &str) -> i32 {
let mut version: Option<i32> = None;
for line in output.lines() {
if let Some(num) = line.trim().split_whitespace().last() {
if let Ok(v) = num.parse::<i32>() {
version = Some(v);
break;
}
}
}
version.unwrap_or_default()
}
fn read_su_path() -> Result<String, io::Error> {
let file = File::open("/data/adb/ap/su_path")?;
let mut reader = BufReader::new(file);
let mut su_path = String::new();
reader.read_line(&mut su_path)?;
Ok(su_path.trim().to_string())
}
pub fn get_apatch() -> Option<Version> {
let default_su_path = String::from("/system/bin/su");
let su_path = read_su_path().ok()?;
let output = Command::new(&su_path)
.arg("-v")
.stdout(Stdio::piped())
.stderr(Stdio::null())
.output()
.ok()?;
let stdout = String::from_utf8(output.stdout).ok()?;
if !stdout.contains("APatch") {
return None;
}
let output1 = Command::new("/data/adb/apd")
.arg("-V")
.stdout(Stdio::piped())
.stderr(Stdio::null())
.output()
.ok()?;
let stdout1 = String::from_utf8(output1.stdout).ok()?;
if su_path == default_su_path {
let version = parse_version(&stdout1);
const MAX_OLD_VERSION: i32 = MIN_APATCH_VERSION - 1;
match version {
0 => Some(Version::Abnormal),
v if v >= MIN_APATCH_VERSION && v <= 999999 => Some(Version::Supported),
v if v >= 1 && v <= MAX_OLD_VERSION => Some(Version::TooOld),
_ => None,
}
} else {
return None;
}
}
#[derive(Deserialize)]
#[allow(dead_code)]
struct PackageConfig {
pkg: String,
exclude: i32,
allow: i32,
uid: i32,
to_uid: i32,
sctx: String,
}
fn read_package_config() -> Result<Vec<PackageConfig>, std::io::Error> {
let file = File::open("/data/adb/ap/package_config")?;
let mut reader = csv::Reader::from_reader(file);
let mut package_configs = Vec::new();
for record in reader.deserialize() {
match record {
Ok(config) => package_configs.push(config),
Err(error) => {
log::warn!("Error deserializing record: {}", error);
}
}
}
Ok(package_configs)
}
pub fn uid_granted_root(uid: i32) -> bool {
match read_package_config() {
Ok(package_configs) => {
package_configs
.iter()
.find(|config| config.uid == uid)
.map(|config| config.allow == 1)
.unwrap_or(false)
}
Err(err) => {
log::warn!("Error reading package config: {}", err);
return false;
}
}
}
pub fn uid_should_umount(uid: i32) -> bool {
match read_package_config() {
Ok(package_configs) => {
package_configs
.iter()
.find(|config| config.uid == uid)
.map(|config| {
match config.exclude {
1 => true,
_ => false,
}
})
.unwrap_or(false)
}
Err(err) => {
log::warn!("Error reading package configs: {}", err);
false
}
}
}
// TODO: signature
pub fn uid_is_manager(uid: i32) -> bool {
if let Ok(s) = rustix::fs::stat("/data/user_de/0/me.bmax.apatch") {
return s.st_uid == uid as u32;
}
false
}

126
zygiskd/src/root_impl/common.c Normal file
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#include <stdio.h>
#include <sys/types.h>
#include "../utils.h"
#include "kernelsu.h"
#include "apatch.h"
#include "magisk.h"
#include "common.h"
static struct root_impl impl;
void root_impls_setup(void) {
struct root_impl_state state_ksu;
ksu_get_existence(&state_ksu);
struct root_impl_state state_apatch;
apatch_get_existence(&state_apatch);
struct root_impl_state state_magisk;
magisk_get_existence(&state_magisk);
/* INFO: Check if it's only one supported, if not, it's multile and that's bad.
Remember that true here is equal to the integer 1. */
if ((state_ksu.state == Supported ? 1 : 0) + (state_apatch.state == Supported ? 1 : 0) + (state_magisk.state == Supported ? 1 : 0) >= 2) {
impl.impl = Multiple;
} else if (state_ksu.state == Supported) {
impl.impl = KernelSU;
} else if (state_apatch.state == Supported) {
impl.impl = APatch;
} else if (state_magisk.state == Supported) {
impl.impl = Magisk;
impl.variant = state_magisk.variant;
} else {
impl.impl = None;
}
switch (impl.impl) {
case None: {
LOGI("No root implementation found.\n");
break;
}
case Multiple: {
LOGI("Multiple root implementations found.\n");
break;
}
case KernelSU: {
LOGI("KernelSU root implementation found.\n");
break;
}
case APatch: {
LOGI("APatch root implementation found.\n");
break;
}
case Magisk: {
if (state_magisk.variant == 0) {
LOGI("Magisk Official root implementation found.\n");
} else {
LOGI("Magisk Kitsune root implementation found.\n");
}
break;
}
}
}
void get_impl(struct root_impl *uimpl) {
uimpl->impl = impl.impl;
uimpl->variant = impl.variant;
}
bool uid_granted_root(uid_t uid) {
switch (impl.impl) {
case KernelSU: {
return ksu_uid_granted_root(uid);
}
case APatch: {
return apatch_uid_granted_root(uid);
}
case Magisk: {
return magisk_uid_granted_root(uid);
}
default: {
return false;
}
}
}
bool uid_should_umount(uid_t uid) {
switch (impl.impl) {
case KernelSU: {
return ksu_uid_should_umount(uid);
}
case APatch: {
return apatch_uid_should_umount(uid);
}
case Magisk: {
return magisk_uid_should_umount(uid);
}
default: {
return false;
}
}
}
bool uid_is_manager(uid_t uid) {
switch (impl.impl) {
case KernelSU: {
return ksu_uid_is_manager(uid);
}
case APatch: {
return apatch_uid_is_manager(uid);
}
case Magisk: {
return magisk_uid_is_manager(uid);
}
default: {
return false;
}
}
}

38
zygiskd/src/root_impl/common.h Normal file
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#ifndef COMMON_H
#define COMMON_H
#include <stdint.h>
#include "../constants.h"
enum root_impls {
None,
Multiple,
KernelSU,
APatch,
Magisk
};
struct root_impl_state {
enum RootImplState state;
uint8_t variant;
};
struct root_impl {
enum root_impls impl;
uint8_t variant;
};
#define LONGEST_ROOT_IMPL_NAME sizeof("Magisk Official")
void root_impls_setup(void);
void get_impl(struct root_impl *uimpl);
bool uid_granted_root(uid_t uid);
bool uid_should_umount(uid_t uid);
bool uid_is_manager(uid_t uid);
#endif /* COMMON_H */

82
zygiskd/src/root_impl/kernelsu.c Normal file
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#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/prctl.h>
#include <errno.h>
#include "../constants.h"
#include "../utils.h"
#include "common.h"
#include "kernelsu.h"
/* INFO: It would be presumed it is a unsigned int,
so we need to cast it to signed int to
avoid any potential UB.
*/
#define KERNEL_SU_OPTION 0xdeadbeef
#define CMD_GET_VERSION 2
#define CMD_UID_GRANTED_ROOT 12
#define CMD_UID_SHOULD_UMOUNT 13
void ksu_get_existence(struct root_impl_state *state) {
int version = 0;
prctl((signed int)KERNEL_SU_OPTION, CMD_GET_VERSION, &version, 0, 0);
if (version == 0) state->state = Abnormal;
else if (version >= MIN_KSU_VERSION && version <= MAX_KSU_VERSION) {
/* INFO: Some custom kernels for custom ROMs have pre-installed KernelSU.
Some users don't want to use KernelSU, but, for example, Magisk.
This if allows this to happen, as it checks if "ksud" exists,
which in case it doesn't, it won't be considered as supported. */
struct stat s;
if (stat("/data/adb/ksud", &s) == -1) {
if (errno != ENOENT) {
LOGE("Failed to stat KSU daemon: %s\n", strerror(errno));
}
errno = 0;
state->state = Abnormal;
return;
}
state->state = Supported;
}
else if (version >= 1 && version <= MIN_KSU_VERSION - 1) state->state = TooOld;
else state->state = Abnormal;
}
bool ksu_uid_granted_root(uid_t uid) {
uint32_t result = 0;
bool granted = false;
prctl(KERNEL_SU_OPTION, CMD_UID_GRANTED_ROOT, uid, &granted, &result);
if (result != KERNEL_SU_OPTION) return false;
return granted;
}
bool ksu_uid_should_umount(uid_t uid) {
uint32_t result = 0;
bool umount = false;
prctl(KERNEL_SU_OPTION, CMD_UID_SHOULD_UMOUNT, uid, &umount, &result);
if (result != KERNEL_SU_OPTION) return false;
return umount;
}
bool ksu_uid_is_manager(uid_t uid) {
struct stat s;
if (stat("/data/user_de/0/me.weishu.kernelsu", &s) == -1) {
if (errno != ENOENT) {
LOGE("Failed to stat KSU manager data directory: %s\n", strerror(errno));
}
errno = 0;
return false;
}
return s.st_uid == uid;
}

14
zygiskd/src/root_impl/kernelsu.h Normal file
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@@ -0,0 +1,14 @@
#ifndef KERNELSU_H
#define KERNELSU_H
#include "../constants.h"
void ksu_get_existence(struct root_impl_state *state);
bool ksu_uid_granted_root(uid_t uid);
bool ksu_uid_should_umount(uid_t uid);
bool ksu_uid_is_manager(uid_t uid);
#endif

77
zygiskd/src/root_impl/kernelsu.rs
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@@ -1,77 +0,0 @@
use crate::constants::{MAX_KSU_VERSION, MIN_KSU_VERSION};
const KERNEL_SU_OPTION: u32 = 0xdeadbeefu32;
const CMD_GET_VERSION: usize = 2;
const CMD_UID_GRANTED_ROOT: usize = 12;
const CMD_UID_SHOULD_UMOUNT: usize = 13;
pub enum Version {
Supported,
TooOld,
Abnormal,
}
pub fn get_kernel_su() -> Option<Version> {
let mut version = 0;
unsafe {
libc::prctl(
KERNEL_SU_OPTION as i32,
CMD_GET_VERSION,
&mut version as *mut i32,
0,
0,
)
};
const MAX_OLD_VERSION: i32 = MIN_KSU_VERSION - 1;
match version {
0 => None,
MIN_KSU_VERSION..=MAX_KSU_VERSION => Some(Version::Supported),
1..=MAX_OLD_VERSION => Some(Version::TooOld),
_ => Some(Version::Abnormal),
}
}
pub fn uid_granted_root(uid: i32) -> bool {
let mut result: u32 = 0;
let mut granted = false;
unsafe {
libc::prctl(
KERNEL_SU_OPTION as i32,
CMD_UID_GRANTED_ROOT,
uid,
&mut granted as *mut bool,
&mut result as *mut u32,
)
};
if result != KERNEL_SU_OPTION {
log::warn!("uid_granted_root failed");
}
granted
}
pub fn uid_should_umount(uid: i32) -> bool {
let mut result: u32 = 0;
let mut umount = false;
unsafe {
libc::prctl(
KERNEL_SU_OPTION as i32,
CMD_UID_SHOULD_UMOUNT,
uid,
&mut umount as *mut bool,
&mut result as *mut u32,
)
};
if result != KERNEL_SU_OPTION {
log::warn!("uid_granted_root failed");
}
umount
}
// TODO: signature
pub fn uid_is_manager(uid: i32) -> bool {
if let Ok(s) = rustix::fs::stat("/data/user_de/0/me.weishu.kernelsu") {
return s.st_uid == uid as u32;
}
false
}

190
zygiskd/src/root_impl/magisk.c Normal file
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#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include <dirent.h>
#include <sys/stat.h>
#include <sys/prctl.h>
#include <errno.h>
#include <unistd.h>
#include "../constants.h"
#include "../utils.h"
#include "common.h"
#include "magisk.h"
char *supported_variants[] = {
"kitsune"
};
char *magisk_managers[] = {
"com.topjohnwu.magisk",
"io.github.huskydg.magisk"
};
#define SBIN_MAGISK lp_select("/sbin/magisk32", "/sbin/magisk64")
#define DEBUG_RAMDISK_MAGISK lp_select("/debug_ramdisk/magisk32", "/debug_ramdisk/magisk64")
#define BITLESS_DEBUG_RAMDISK_MAGISK "/debug_ramdisk/magisk"
enum magisk_variants variant = Official;
/* INFO: Longest path */
static char path_to_magisk[sizeof(DEBUG_RAMDISK_MAGISK)];
void magisk_get_existence(struct root_impl_state *state) {
struct stat s;
if (stat(SBIN_MAGISK, &s) != 0) {
if (errno != ENOENT) {
LOGE("Failed to stat Magisk /sbin/magisk binary: %s\n", strerror(errno));
}
errno = 0;
if (stat(DEBUG_RAMDISK_MAGISK, &s) != 0) {
if (errno != ENOENT) {
LOGE("Failed to stat Magisk %s binary: %s\n", DEBUG_RAMDISK_MAGISK, strerror(errno));
}
errno = 0;
if (stat(BITLESS_DEBUG_RAMDISK_MAGISK, &s) != 0) {
if (errno != ENOENT) {
LOGE("Failed to stat Magisk /debug_ramdisk/magisk binary: %s\n", strerror(errno));
}
errno = 0;
state->state = Inexistent;
return;
}
/* INFO: /debug_ramdisk/magisk64 (or 32) doesn't exist but /debug_ramdisk/magisk does */
strcpy(path_to_magisk, BITLESS_DEBUG_RAMDISK_MAGISK);
} else {
/* INFO: /sbin/magisk doesn't exist but /debug_ramdisk/magisk does */
strcpy(path_to_magisk, DEBUG_RAMDISK_MAGISK);
}
} else {
/* INFO: /sbin/magisk exists */
strcpy(path_to_magisk, SBIN_MAGISK);
}
char *argv[] = { "magisk", "-v", NULL };
char magisk_info[128];
if (!exec_command(magisk_info, sizeof(magisk_info), (const char *)path_to_magisk, argv)) {
LOGE("Failed to execute magisk binary: %s\n", strerror(errno));
errno = 0;
state->state = Abnormal;
return;
}
state->variant = (uint8_t)Official;
for (unsigned long i = 0; i < sizeof(supported_variants) / sizeof(supported_variants[0]); i++) {
if (strstr(magisk_info, supported_variants[i])) {
variant = (enum magisk_variants)(i + 1);
state->variant = (uint8_t)variant;
break;
}
}
argv[1] = "-V";
char magisk_version[32];
if (!exec_command(magisk_version, sizeof(magisk_version), (const char *)path_to_magisk, argv)) {
LOGE("Failed to execute magisk binary: %s\n", strerror(errno));
errno = 0;
state->state = Abnormal;
return;
}
if (atoi(magisk_version) >= MIN_MAGISK_VERSION) state->state = Supported;
else state->state = TooOld;
}
bool magisk_uid_granted_root(uid_t uid) {
char sqlite_cmd[256];
snprintf(sqlite_cmd, sizeof(sqlite_cmd), "select 1 from policies where uid=%d and policy=2 limit 1", uid);
char *const argv[] = { "magisk", "--sqlite", sqlite_cmd, NULL };
char result[32];
if (!exec_command(result, sizeof(result), (const char *)path_to_magisk, argv)) {
LOGE("Failed to execute magisk binary: %s\n", strerror(errno));
errno = 0;
return false;
}
return result[0] != '\0';
}
bool magisk_uid_should_umount(uid_t uid) {
char uid_str[16];
snprintf(uid_str, sizeof(uid_str), "%d", uid);
char *const argv_pm[] = { "pm", "list", "packages", "--uid", uid_str, NULL };
char result[256];
if (!exec_command(result, sizeof(result), "/system/bin/pm", argv_pm)) {
LOGE("Failed to execute pm binary: %s\n", strerror(errno));
errno = 0;
/* INFO: It's better if we do NOT umount than the opposite */
return false;
}
if (result[0] == '\0') {
LOGE("Failed to get package name from UID %d\n", uid);
return false;
}
char *package_name = strtok(result + strlen("package:"), " ");
char sqlite_cmd[256];
snprintf(sqlite_cmd, sizeof(sqlite_cmd), "select 1 from denylist where package_name=\"%s\" limit 1", package_name);
char *const argv[] = { "magisk", "--sqlite", sqlite_cmd, NULL };
if (!exec_command(result, sizeof(result), (const char *)path_to_magisk, argv)) {
LOGE("Failed to execute magisk binary: %s\n", strerror(errno));
errno = 0;
return false;
}
return result[0] != '\0';
}
bool magisk_uid_is_manager(uid_t uid) {
char *const argv[] = { "magisk", "--sqlite", "select value from strings where key=\"requester\" limit 1", NULL };
char output[128];
if (!exec_command(output, sizeof(output), (const char *)path_to_magisk, argv)) {
LOGE("Failed to execute magisk binary: %s\n", strerror(errno));
errno = 0;
return false;
}
char stat_path[PATH_MAX];
if (output[0] == '\0')
snprintf(stat_path, sizeof(stat_path), "/data/user_de/0/%s", magisk_managers[(int)variant]);
else
snprintf(stat_path, sizeof(stat_path), "/data/user_de/0/%s", output + strlen("value="));
struct stat s;
if (stat(stat_path, &s) == -1) {
LOGE("Failed to stat %s: %s\n", stat_path, strerror(errno));
errno = 0;
return false;
}
return s.st_uid == uid;
}

19
zygiskd/src/root_impl/magisk.h Normal file
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@@ -0,0 +1,19 @@
#ifndef MAGISK_H
#define MAGISK_H
#include "../constants.h"
enum magisk_variants {
Official,
Kitsune
};
void magisk_get_existence(struct root_impl_state *state);
bool magisk_uid_granted_root(uid_t uid);
bool magisk_uid_should_umount(uid_t uid);
bool magisk_uid_is_manager(uid_t uid);
#endif

124
zygiskd/src/root_impl/magisk.rs
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@@ -1,124 +0,0 @@
use std::fs;
use std::os::android::fs::MetadataExt;
use crate::constants::MIN_MAGISK_VERSION;
use std::process::{Command, Stdio};
use log::info;
use crate::utils::LateInit;
const MAGISK_OFFICIAL: &str = "com.topjohnwu.magisk";
const MAGISK_THIRD_PARTIES: &[(&str, &str)] = &[
("alpha", "io.github.vvb2060.magisk"),
("kitsune", "io.github.huskydg.magisk"),
];
pub enum Version {
Supported,
TooOld,
}
static VARIANT: LateInit<&str> = LateInit::new();
pub fn get_magisk() -> Option<Version> {
if !VARIANT.initiated() {
Command::new("magisk")
.arg("-v")
.stdout(Stdio::piped())
.spawn()
.ok()
.and_then(|child| child.wait_with_output().ok())
.and_then(|output| String::from_utf8(output.stdout).ok())
.map(|version| {
let third_party = MAGISK_THIRD_PARTIES.iter().find_map(|v| {
version.contains(v.0).then_some(v.1)
});
VARIANT.init(third_party.unwrap_or(MAGISK_OFFICIAL));
info!("Magisk variant: {}", *VARIANT);
});
}
Command::new("magisk")
.arg("-V")
.stdout(Stdio::piped())
.spawn()
.ok()
.and_then(|child| child.wait_with_output().ok())
.and_then(|output| String::from_utf8(output.stdout).ok())
.and_then(|output| output.trim().parse::<i32>().ok())
.map(|version| {
if version >= MIN_MAGISK_VERSION {
Version::Supported
} else {
Version::TooOld
}
})
}
pub fn uid_granted_root(uid: i32) -> bool {
Command::new("magisk")
.arg("--sqlite")
.arg(format!(
"select 1 from policies where uid={uid} and policy=2 limit 1"
))
.stdout(Stdio::piped())
.spawn()
.ok()
.and_then(|child| child.wait_with_output().ok())
.and_then(|output| String::from_utf8(output.stdout).ok())
.map(|output| output.is_empty())
== Some(false)
}
pub fn uid_should_umount(uid: i32) -> bool {
let output = Command::new("pm")
.args(["list", "packages", "--uid", &uid.to_string()])
.stdout(Stdio::piped())
.spawn()
.ok()
.and_then(|child| child.wait_with_output().ok())
.and_then(|output| String::from_utf8(output.stdout).ok());
let line = match output {
Some(line) => line,
None => return false,
};
let pkg = line
.strip_prefix("package:")
.and_then(|line| line.split(' ').next());
let pkg = match pkg {
Some(pkg) => pkg,
None => return false,
};
Command::new("magisk")
.arg("--sqlite")
.arg(format!(
"select 1 from denylist where package_name=\"{pkg}\" limit 1"
))
.stdout(Stdio::piped())
.spawn()
.ok()
.and_then(|child| child.wait_with_output().ok())
.and_then(|output| String::from_utf8(output.stdout).ok())
.map(|output| output.is_empty())
== Some(false)
}
// TODO: signature
pub fn uid_is_manager(uid: i32) -> bool {
let output = Command::new("magisk")
.arg("--sqlite")
.arg(format!("select value from strings where key=\"requester\" limit 1"))
.stdout(Stdio::piped())
.spawn()
.ok()
.and_then(|child| child.wait_with_output().ok())
.and_then(|output| String::from_utf8(output.stdout).ok())
.map(|output| output.trim().to_string());
if let Some(output) = output {
if let Some(manager) = output.strip_prefix("value=") {
return fs::metadata(format!("/data/user_de/0/{}", manager))
.map(|s| s.st_uid() == uid as u32)
.unwrap_or(false);
}
}
fs::metadata(format!("/data/user_de/0/{}", *VARIANT))
.map(|s| s.st_uid() == uid as u32)
.unwrap_or(false)
}

78
zygiskd/src/root_impl/mod.rs
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@@ -1,78 +0,0 @@
use std::ptr::addr_of;
mod kernelsu;
mod magisk;
mod apatch;
#[derive(Debug)]
pub enum RootImpl {
None,
TooOld,
Abnormal,
Multiple,
KernelSU,
Magisk,
APatch,
}
static mut ROOT_IMPL: RootImpl = RootImpl::None;
pub fn setup() {
let apatch_version = apatch::get_apatch();
let ksu_version = kernelsu::get_kernel_su();
let magisk_version = magisk::get_magisk();
let impl_ = match (apatch_version, ksu_version, magisk_version) {
(None, None, None) => RootImpl::None,
(Some(_), Some(_), Some(_)) => RootImpl::Multiple,
(Some(apatch_version),None, None) => match apatch_version {
apatch::Version::Supported => RootImpl::APatch,
apatch::Version::TooOld => RootImpl::TooOld,
apatch::Version::Abnormal => RootImpl::Abnormal,
},
(None,Some(ksu_version), None) => match ksu_version {
kernelsu::Version::Supported => RootImpl::KernelSU,
kernelsu::Version::TooOld => RootImpl::TooOld,
kernelsu::Version::Abnormal => RootImpl::Abnormal,
},
(None, None, Some(magisk_version)) => match magisk_version {
magisk::Version::Supported => RootImpl::Magisk,
magisk::Version::TooOld => RootImpl::TooOld,
},
_ => RootImpl::None,
};
unsafe {
ROOT_IMPL = impl_;
}
}
pub fn get_impl() -> &'static RootImpl {
unsafe { &*addr_of!(ROOT_IMPL) }
}
pub fn uid_granted_root(uid: i32) -> bool {
match get_impl() {
RootImpl::KernelSU => kernelsu::uid_granted_root(uid),
RootImpl::Magisk => magisk::uid_granted_root(uid),
RootImpl::APatch => apatch::uid_granted_root(uid),
_ => panic!("uid_granted_root: unknown root impl {:?}", get_impl()),
}
}
pub fn uid_should_umount(uid: i32) -> bool {
match get_impl() {
RootImpl::KernelSU => kernelsu::uid_should_umount(uid),
RootImpl::Magisk => magisk::uid_should_umount(uid),
RootImpl::APatch => apatch::uid_should_umount(uid),
_ => panic!("uid_should_umount: unknown root impl {:?}", get_impl()),
}
}
pub fn uid_is_manager(uid: i32) -> bool {
match get_impl() {
RootImpl::KernelSU => kernelsu::uid_is_manager(uid),
RootImpl::Magisk => magisk::uid_is_manager(uid),
RootImpl::APatch => apatch::uid_is_manager(uid),
_ => panic!("uid_is_manager: unknown root impl {:?}", get_impl()),
}
}

458
zygiskd/src/utils.c Normal file
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@@ -0,0 +1,458 @@
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include <poll.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/wait.h>
#include <sys/un.h>
#include <errno.h>
#include <unistd.h>
#include <linux/limits.h>
#include <sched.h>
#include <pthread.h>
#include <android/log.h>
#include "utils.h"
#include "root_impl/common.h"
bool switch_mount_namespace(pid_t pid) {
char path[PATH_MAX];
snprintf(path, sizeof(path), "/proc/%d/ns/mnt", pid);
int nsfd = open(path, O_RDONLY | O_CLOEXEC);
if (nsfd == -1) {
LOGE("Failed to open nsfd: %s\n", strerror(errno));
return false;
}
if (setns(nsfd, CLONE_NEWNS) == -1) {
LOGE("Failed to setns: %s\n", strerror(errno));
close(nsfd);
return false;
}
close(nsfd);
return true;
}
int __system_property_get(const char *, char *);
void get_property(const char *restrict name, char *restrict output) {
__system_property_get(name, output);
}
void set_socket_create_context(const char *restrict context) {
char path[PATH_MAX];
snprintf(path, PATH_MAX, "/proc/thread-self/attr/sockcreate");
FILE *sockcreate = fopen(path, "w");
if (sockcreate == NULL) {
LOGE("Failed to open /proc/thread-self/attr/sockcreate: %s Now trying to via gettid().\n", strerror(errno));
goto fail;
}
if (fwrite(context, 1, strlen(context), sockcreate) != strlen(context)) {
LOGE("Failed to write to /proc/thread-self/attr/sockcreate: %s Now trying to via gettid().\n", strerror(errno));
fclose(sockcreate);
goto fail;
}
fclose(sockcreate);
return;
fail:
snprintf(path, PATH_MAX, "/proc/self/task/%d/attr/sockcreate", gettid());
sockcreate = fopen(path, "w");
if (sockcreate == NULL) {
LOGE("Failed to open %s: %s\n", path, strerror(errno));
return;
}
if (fwrite(context, 1, strlen(context), sockcreate) != strlen(context)) {
LOGE("Failed to write to %s: %s\n", path, strerror(errno));
return;
}
fclose(sockcreate);
}
static void get_current_attr(char *restrict output, size_t size) {
char path[PATH_MAX];
snprintf(path, PATH_MAX, "/proc/self/attr/current");
FILE *current = fopen(path, "r");
if (current == NULL) {
LOGE("fopen: %s\n", strerror(errno));
return;
}
if (fread(output, 1, size, current) == 0) {
LOGE("fread: %s\n", strerror(errno));
return;
}
fclose(current);
}
void unix_datagram_sendto(const char *restrict path, void *restrict buf, size_t len) {
char current_attr[PATH_MAX];
get_current_attr(current_attr, sizeof(current_attr));
set_socket_create_context(current_attr);
struct sockaddr_un addr;
addr.sun_family = AF_UNIX;
strncpy(addr.sun_path, path, sizeof(addr.sun_path) - 1);
int socket_fd = socket(AF_UNIX, SOCK_DGRAM, 0);
if (socket_fd == -1) {
LOGE("socket: %s\n", strerror(errno));
return;
}
if (connect(socket_fd, (struct sockaddr *)&addr, sizeof(addr)) == -1) {
LOGE("connect: %s\n", strerror(errno));
return;
}
if (sendto(socket_fd, buf, len, 0, (struct sockaddr *)&addr, sizeof(addr)) == -1) {
LOGE("sendto: %s\n", strerror(errno));
return;
}
set_socket_create_context("u:r:zygote:s0");
close(socket_fd);
}
int chcon(const char *restrict path, const char *context) {
char command[PATH_MAX];
snprintf(command, PATH_MAX, "chcon %s %s", context, path);
return system(command);
}
int unix_listener_from_path(char *restrict path) {
if (remove(path) == -1 && errno != ENOENT) {
LOGE("remove: %s\n", strerror(errno));
return -1;
}
int socket_fd = socket(AF_UNIX, SOCK_STREAM, 0);
if (socket_fd == -1) {
LOGE("socket: %s\n", strerror(errno));
return -1;
}
struct sockaddr_un addr = {
.sun_family = AF_UNIX
};
strncpy(addr.sun_path, path, sizeof(addr.sun_path) - 1);
if (bind(socket_fd, (struct sockaddr *)&addr, sizeof(struct sockaddr_un)) == -1) {
LOGE("bind: %s\n", strerror(errno));
return -1;
}
if (listen(socket_fd, 2) == -1) {
LOGE("listen: %s\n", strerror(errno));
return -1;
}
if (chcon(path, "u:object_r:magisk_file:s0") == -1) {
LOGE("chcon: %s\n", strerror(errno));
return -1;
}
return socket_fd;
}
ssize_t write_fd(int fd, int sendfd) {
char cmsgbuf[CMSG_SPACE(sizeof(int))];
char buf[1] = { 0 };
struct iovec iov = {
.iov_base = buf,
.iov_len = 1
};
struct msghdr msg = {
.msg_iov = &iov,
.msg_iovlen = 1,
.msg_control = cmsgbuf,
.msg_controllen = sizeof(cmsgbuf)
};
struct cmsghdr *cmsg = CMSG_FIRSTHDR(&msg);
cmsg->cmsg_len = CMSG_LEN(sizeof(int));
cmsg->cmsg_level = SOL_SOCKET;
cmsg->cmsg_type = SCM_RIGHTS;
memcpy(CMSG_DATA(cmsg), &sendfd, sizeof(int));
ssize_t ret = sendmsg(fd, &msg, 0);
if (ret == -1) {
LOGE("sendmsg: %s\n", strerror(errno));
return -1;
}
return ret;
}
int read_fd(int fd) {
char cmsgbuf[CMSG_SPACE(sizeof(int))];
char buf[1] = { 0 };
struct iovec iov = {
.iov_base = buf,
.iov_len = 1
};
struct msghdr msg = {
.msg_iov = &iov,
.msg_iovlen = 1,
.msg_control = cmsgbuf,
.msg_controllen = sizeof(cmsgbuf)
};
ssize_t ret = recvmsg(fd, &msg, 0);
if (ret == -1) {
LOGE("recvmsg: %s\n", strerror(errno));
return -1;
}
struct cmsghdr *cmsg = CMSG_FIRSTHDR(&msg);
if (cmsg == NULL) {
LOGE("CMSG_FIRSTHDR: %s\n", strerror(errno));
return -1;
}
int sendfd;
memcpy(&sendfd, CMSG_DATA(cmsg), sizeof(int));
return sendfd;
}
#define write_func(type) \
ssize_t write_## type(int fd, type val) { \
return write(fd, &val, sizeof(type)); \
}
#define read_func(type) \
ssize_t read_## type(int fd, type *val) { \
return read(fd, val, sizeof(type)); \
}
write_func(int)
read_func(int)
write_func(size_t)
read_func(size_t)
write_func(uint32_t)
read_func(uint32_t)
write_func(uint8_t)
read_func(uint8_t)
ssize_t write_string(int fd, const char *restrict str) {
size_t len[1];
len[0] = strlen(str);
ssize_t written_bytes = write(fd, &len, sizeof(size_t));
if (written_bytes != sizeof(size_t)) {
LOGE("Failed to write string length: Not all bytes were written (%zd != %zu).\n", written_bytes, sizeof(size_t));
return -1;
}
written_bytes = write(fd, str, len[0]);
if ((size_t)written_bytes != len[0]) {
LOGE("Failed to write string: Not all bytes were written.\n");
return -1;
}
return written_bytes;
}
ssize_t read_string(int fd, char *restrict str, size_t len) {
size_t str_len_buf[1];
ssize_t read_bytes = read(fd, &str_len_buf, sizeof(size_t));
if (read_bytes != (ssize_t)sizeof(size_t)) {
LOGE("Failed to read string length: Not all bytes were read (%zd != %zu).\n", read_bytes, sizeof(size_t));
return -1;
}
size_t str_len = str_len_buf[0];
if (str_len > len) {
LOGE("Failed to read string: Buffer is too small (%zu > %zu).\n", str_len, len);
return -1;
}
read_bytes = read(fd, str, str_len);
if (read_bytes != (ssize_t)str_len) {
LOGE("Failed to read string: Promised bytes doesn't exist (%zd != %zu).\n", read_bytes, str_len);
return -1;
}
return read_bytes;
}
/* INFO: Cannot use restrict here as execv does not have restrict */
bool exec_command(char *restrict buf, size_t len, const char *restrict file, char *const argv[]) {
int link[2];
pid_t pid;
if (pipe(link) == -1) {
LOGE("pipe: %s\n", strerror(errno));
return false;
}
if ((pid = fork()) == -1) {
LOGE("fork: %s\n", strerror(errno));
close(link[0]);
close(link[1]);
return false;
}
if (pid == 0) {
dup2(link[1], STDOUT_FILENO);
close(link[0]);
close(link[1]);
execv(file, argv);
LOGE("execv failed: %s\n", strerror(errno));
_exit(1);
} else {
close(link[1]);
int nbytes = read(link[0], buf, len);
if (nbytes > 0) buf[nbytes - 1] = '\0';
/* INFO: If something went wrong, at least we must ensure it is NULL-terminated */
else buf[0] = '\0';
wait(NULL);
close(link[0]);
}
return true;
}
bool check_unix_socket(int fd, bool block) {
struct pollfd pfd = {
.fd = fd,
.events = POLLIN,
.revents = 0
};
int timeout = block ? -1 : 0;
poll(&pfd, 1, timeout);
return pfd.revents & ~POLLIN ? false : true;
}
/* INFO: Cannot use restrict here as execv does not have restrict */
int non_blocking_execv(const char *restrict file, char *const argv[]) {
int link[2];
pid_t pid;
if (pipe(link) == -1) {
LOGE("pipe: %s\n", strerror(errno));
return -1;
}
if ((pid = fork()) == -1) {
LOGE("fork: %s\n", strerror(errno));
return -1;
}
if (pid == 0) {
dup2(link[1], STDOUT_FILENO);
close(link[0]);
close(link[1]);
execv(file, argv);
} else {
close(link[1]);
return link[0];
}
return -1;
}
void stringify_root_impl_name(struct root_impl impl, char *restrict output) {
switch (impl.impl) {
case None: {
strcpy(output, "None");
break;
}
case Multiple: {
strcpy(output, "Multiple");
break;
}
case KernelSU: {
strcpy(output, "KernelSU");
break;
}
case APatch: {
strcpy(output, "APatch");
break;
}
case Magisk: {
if (impl.variant == 0) {
strcpy(output, "Magisk Official");
} else {
strcpy(output, "Magisk Kitsune");
}
break;
}
}
}

107
zygiskd/src/utils.h Normal file
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#ifndef UTILS_H
#define UTILS_H
#include <sys/types.h>
#include "constants.h"
#include "root_impl/common.h"
#define CONCAT_(x,y) x##y
#define CONCAT(x,y) CONCAT_(x,y)
#define LOGI(...) \
__android_log_print(ANDROID_LOG_INFO, lp_select("zygiskd32", "zygiskd64"), __VA_ARGS__); \
printf(__VA_ARGS__);
#define LOGE(...) \
__android_log_print(ANDROID_LOG_ERROR , lp_select("zygiskd32", "zygiskd64"), __VA_ARGS__); \
printf(__VA_ARGS__);
#define ASSURE_SIZE_WRITE(area_name, subarea_name, sent_size, expected_size) \
if (sent_size != (ssize_t)(expected_size)) { \
LOGE("Failed to sent " subarea_name " in " area_name ": Expected %zu, got %zd\n", expected_size, sent_size); \
\
return; \
}
#define ASSURE_SIZE_READ(area_name, subarea_name, sent_size, expected_size) \
if (sent_size != (ssize_t)(expected_size)) { \
LOGE("Failed to read " subarea_name " in " area_name ": Expected %zu, got %zd\n", expected_size, sent_size); \
\
return; \
}
#define ASSURE_SIZE_WRITE_BREAK(area_name, subarea_name, sent_size, expected_size) \
if (sent_size != (ssize_t)(expected_size)) { \
LOGE("Failed to sent " subarea_name " in " area_name ": Expected %zu, got %zd\n", expected_size, sent_size); \
\
break; \
}
#define ASSURE_SIZE_READ_BREAK(area_name, subarea_name, sent_size, expected_size) \
if (sent_size != (ssize_t)(expected_size)) { \
LOGE("Failed to read " subarea_name " in " area_name ": Expected %zu, got %zd\n", expected_size, sent_size); \
\
break; \
}
#define ASSURE_SIZE_WRITE_WR(area_name, subarea_name, sent_size, expected_size) \
if (sent_size != (ssize_t)(expected_size)) { \
LOGE("Failed to sent " subarea_name " in " area_name ": Expected %zu, got %zd\n", expected_size, sent_size); \
\
return -1; \
}
#define ASSURE_SIZE_READ_WR(area_name, subarea_name, sent_size, expected_size) \
if (sent_size != (ssize_t)(expected_size)) { \
LOGE("Failed to read " subarea_name " in " area_name ": Expected %zu, got %zd\n", expected_size, sent_size); \
\
return -1; \
}
#define write_func_def(type) \
ssize_t write_## type(int fd, type val)
#define read_func_def(type) \
ssize_t read_## type(int fd, type *val)
bool switch_mount_namespace(pid_t pid);
void get_property(const char *name, char *restrict output);
void set_socket_create_context(const char *restrict context);
void unix_datagram_sendto(const char *restrict path, void *restrict buf, size_t len);
int chcon(const char *path, const char *restrict context);
int unix_listener_from_path(char *path);
ssize_t write_fd(int fd, int sendfd);
int read_fd(int fd);
write_func_def(int);
read_func_def(int);
write_func_def(size_t);
read_func_def(size_t);
write_func_def(uint32_t);
read_func_def(uint32_t);
write_func_def(uint8_t);
read_func_def(uint8_t);
ssize_t write_string(int fd, const char *restrict str);
ssize_t read_string(int fd, char *restrict str, size_t len);
bool exec_command(char *restrict buf, size_t len, const char *restrict file, char *const argv[]);
bool check_unix_socket(int fd, bool block);
int non_blocking_execv(const char *restrict file, char *const argv[]);
void stringify_root_impl_name(struct root_impl impl, char *restrict output);
#endif /* UTILS_H */

264
zygiskd/src/utils.rs
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@@ -1,264 +0,0 @@
use anyhow::Result;
use rustix::net::{
bind_unix, connect_unix, listen, sendto_unix, socket, AddressFamily, SendFlags, SocketAddrUnix,
SocketType,
};
use rustix::path::Arg;
use rustix::thread::gettid;
use std::ffi::{c_char, c_void, CStr, CString};
use std::os::fd::{AsFd, AsRawFd};
use std::os::unix::net::{UnixListener};
use std::process::Command;
use std::sync::OnceLock;
use std::{
fs,
io::{Read, Write},
os::unix::net::UnixStream,
};
#[cfg(target_pointer_width = "64")]
#[macro_export]
macro_rules! lp_select {
($lp32:expr, $lp64:expr) => {
$lp64
};
}
#[cfg(target_pointer_width = "32")]
#[macro_export]
macro_rules! lp_select {
($lp32:expr, $lp64:expr) => {
$lp32
};
}
#[cfg(debug_assertions)]
#[macro_export]
macro_rules! debug_select {
($debug:expr, $release:expr) => {
$debug
};
}
#[cfg(not(debug_assertions))]
#[macro_export]
macro_rules! debug_select {
($debug:expr, $release:expr) => {
$release
};
}
pub struct LateInit<T> {
cell: OnceLock<T>,
}
impl<T> LateInit<T> {
pub const fn new() -> Self {
LateInit {
cell: OnceLock::new(),
}
}
pub fn init(&self, value: T) {
assert!(self.cell.set(value).is_ok())
}
pub fn initiated(&self) -> bool {
self.cell.get().is_some()
}
}
impl<T> std::ops::Deref for LateInit<T> {
type Target = T;
fn deref(&self) -> &T {
self.cell.get().unwrap()
}
}
pub fn set_socket_create_context(context: &str) -> Result<()> {
let path = "/proc/thread-self/attr/sockcreate";
match fs::write(path, context) {
Ok(_) => Ok(()),
Err(_) => {
let path = format!(
"/proc/self/task/{}/attr/sockcreate",
gettid().as_raw_nonzero()
);
fs::write(path, context)?;
Ok(())
}
}
}
pub fn get_current_attr() -> Result<String> {
let s = fs::read("/proc/self/attr/current")?;
Ok(s.to_string_lossy().to_string())
}
pub fn chcon(path: &str, context: &str) -> Result<()> {
Command::new("chcon").arg(context).arg(path).status()?;
Ok(())
}
pub fn log_raw(level: i32, tag: &str, message: &str) -> Result<()> {
let tag = CString::new(tag)?;
let message = CString::new(message)?;
unsafe {
__android_log_print(level, tag.as_ptr(), message.as_ptr());
}
Ok(())
}
pub fn get_property(name: &str) -> Result<String> {
let name = CString::new(name)?;
let mut buf = vec![0u8; 92];
let prop = unsafe {
__system_property_get(name.as_ptr(), buf.as_mut_ptr() as *mut c_char);
CStr::from_bytes_until_nul(&buf)?
};
Ok(prop.to_string_lossy().to_string())
}
#[allow(dead_code)]
pub fn set_property(name: &str, value: &str) -> Result<()> {
let name = CString::new(name)?;
let value = CString::new(value)?;
unsafe {
__system_property_set(name.as_ptr(), value.as_ptr());
}
Ok(())
}
#[allow(dead_code)]
pub fn wait_property(name: &str, serial: u32) -> Result<u32> {
let name = CString::new(name)?;
let info = unsafe { __system_property_find(name.as_ptr()) };
let mut serial = serial;
unsafe {
__system_property_wait(info, serial, &mut serial, std::ptr::null());
}
Ok(serial)
}
#[allow(dead_code)]
pub fn get_property_serial(name: &str) -> Result<u32> {
let name = CString::new(name)?;
let info = unsafe { __system_property_find(name.as_ptr()) };
Ok(unsafe { __system_property_serial(info) })
}
pub fn switch_mount_namespace(pid: i32) -> Result<()> {
let cwd = std::env::current_dir()?;
let mnt = fs::File::open(format!("/proc/{}/ns/mnt", pid))?;
rustix::thread::move_into_link_name_space(mnt.as_fd(), None)?;
std::env::set_current_dir(cwd)?;
Ok(())
}
pub trait UnixStreamExt {
fn read_u8(&mut self) -> Result<u8>;
fn read_u32(&mut self) -> Result<u32>;
fn read_usize(&mut self) -> Result<usize>;
fn read_string(&mut self) -> Result<String>;
fn write_u8(&mut self, value: u8) -> Result<()>;
fn write_u32(&mut self, value: u32) -> Result<()>;
fn write_usize(&mut self, value: usize) -> Result<()>;
fn write_string(&mut self, value: &str) -> Result<()>;
}
impl UnixStreamExt for UnixStream {
fn read_u8(&mut self) -> Result<u8> {
let mut buf = [0u8; 1];
self.read_exact(&mut buf)?;
Ok(buf[0])
}
fn read_u32(&mut self) -> Result<u32> {
let mut buf = [0u8; 4];
self.read_exact(&mut buf)?;
Ok(u32::from_ne_bytes(buf))
}
fn read_usize(&mut self) -> Result<usize> {
let mut buf = [0u8; std::mem::size_of::<usize>()];
self.read_exact(&mut buf)?;
Ok(usize::from_ne_bytes(buf))
}
fn read_string(&mut self) -> Result<String> {
let len = self.read_usize()?;
let mut buf = vec![0u8; len];
self.read_exact(&mut buf)?;
Ok(String::from_utf8(buf)?)
}
fn write_u8(&mut self, value: u8) -> Result<()> {
self.write_all(&value.to_ne_bytes())?;
Ok(())
}
fn write_u32(&mut self, value: u32) -> Result<()> {
self.write_all(&value.to_ne_bytes())?;
Ok(())
}
fn write_usize(&mut self, value: usize) -> Result<()> {
self.write_all(&value.to_ne_bytes())?;
Ok(())
}
fn write_string(&mut self, value: &str) -> Result<()> {
self.write_usize(value.len())?;
self.write_all(value.as_bytes())?;
Ok(())
}
}
pub fn unix_listener_from_path(path: &str) -> Result<UnixListener> {
let _ = fs::remove_file(path);
let addr = SocketAddrUnix::new(path)?;
let socket = socket(AddressFamily::UNIX, SocketType::STREAM, None)?;
bind_unix(&socket, &addr)?;
listen(&socket, 2)?;
chcon(path, "u:object_r:magisk_file:s0")?;
Ok(UnixListener::from(socket))
}
pub fn unix_datagram_sendto(path: &str, buf: &[u8]) -> Result<()> {
// FIXME: shall we set create context every time?
set_socket_create_context(get_current_attr()?.as_str())?;
let addr = SocketAddrUnix::new(path.as_bytes())?;
let socket = socket(AddressFamily::UNIX, SocketType::DGRAM, None)?;
connect_unix(&socket, &addr)?;
sendto_unix(socket, buf, SendFlags::empty(), &addr)?;
set_socket_create_context("u:r:zygote:s0")?;
Ok(())
}
pub fn check_unix_socket(stream: &UnixStream, block: bool) -> bool {
unsafe {
let mut pfd = libc::pollfd {
fd: stream.as_raw_fd(),
events: libc::POLLIN,
revents: 0,
};
let timeout = if block { -1 } else { 0 };
libc::poll(&mut pfd, 1, timeout);
if pfd.revents & !libc::POLLIN != 0 {
return false;
}
}
return true;
}
extern "C" {
fn __android_log_print(prio: i32, tag: *const c_char, fmt: *const c_char, ...) -> i32;
fn __system_property_get(name: *const c_char, value: *mut c_char) -> u32;
fn __system_property_set(name: *const c_char, value: *const c_char) -> u32;
fn __system_property_find(name: *const c_char) -> *const c_void;
fn __system_property_wait(
info: *const c_void,
old_serial: u32,
new_serial: *mut u32,
timeout: *const libc::timespec,
) -> bool;
fn __system_property_serial(info: *const c_void) -> u32;
}

713
zygiskd/src/zygiskd.c Normal file
View File

@@ -0,0 +1,713 @@
#include <stdlib.h>
#include <string.h>
#include <dirent.h>
#include <sys/mman.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <sys/sendfile.h>
#include <fcntl.h>
#include <errno.h>
#include <stdio.h>
#include <unistd.h>
#include <linux/limits.h>
#include <sys/syscall.h>
#include <linux/memfd.h>
#include <pthread.h>
#include "root_impl/common.h"
#include "constants.h"
#include "utils.h"
struct Module {
char *name;
int lib_fd;
int companion;
};
struct Context {
struct Module *modules;
int len;
};
enum Architecture {
ARM32,
ARM64,
X86,
X86_64,
};
#define PATH_MODULES_DIR "/data/adb/modules"
#define TMP_PATH "/data/adb/rezygisk"
#define CONTROLLER_SOCKET TMP_PATH "/init_monitor"
#define PATH_CP_NAME TMP_PATH "/" lp_select("cp32.sock", "cp64.sock")
#define ZYGISKD_FILE PATH_MODULES_DIR "/zygisksu/bin/zygiskd" lp_select("32", "64")
#define ZYGISKD_PATH "/data/adb/modules/zygisksu/bin/zygiskd" lp_select("32", "64")
static enum Architecture get_arch(void) {
char system_arch[32];
get_property("ro.product.cpu.abi", system_arch);
if (strstr(system_arch, "arm") != NULL) return lp_select(ARM32, ARM64);
if (strstr(system_arch, "x86") != NULL) return lp_select(X86, X86_64);
LOGE("Unsupported system architecture: %s\n", system_arch);
exit(1);
}
int create_library_fd(const char *restrict so_path) {
int so_fd = open(so_path, O_RDONLY);
if (so_fd == -1) {
LOGE("Failed opening so file: %s\n", strerror(errno));
return -1;
}
off_t so_size = lseek(so_fd, 0, SEEK_END);
if (so_size == -1) {
LOGE("Failed getting so file size: %s\n", strerror(errno));
close(so_fd);
return -1;
}
if (lseek(so_fd, 0, SEEK_SET) == -1) {
LOGE("Failed seeking so file: %s\n", strerror(errno));
close(so_fd);
return -1;
}
/* INFO: This is required as older implementations of glibc may not
have the memfd_create function call, causing a crash. */
int memfd = syscall(SYS_memfd_create, "jit-cache-zygisk", MFD_ALLOW_SEALING);
if (memfd == -1) {
LOGE("Failed creating memfd: %s\n", strerror(errno));
return -1;
}
if (sendfile(memfd, so_fd, NULL, so_size) == -1) {
LOGE("Failed copying so file to memfd: %s\n", strerror(errno));
close(so_fd);
close(memfd);
return -1;
}
close(so_fd);
if (fcntl(memfd, F_ADD_SEALS, F_SEAL_SHRINK | F_SEAL_GROW | F_SEAL_WRITE | F_SEAL_SEAL) == -1) {
LOGE("Failed sealing memfd: %s\n", strerror(errno));
close(memfd);
return -1;
}
return memfd;
}
/* WARNING: Dynamic memory based */
static void load_modules(enum Architecture arch, struct Context *restrict context) {
context->len = 0;
context->modules = NULL;
DIR *dir = opendir(PATH_MODULES_DIR);
if (dir == NULL) {
LOGE("Failed opening modules directory: %s.", PATH_MODULES_DIR);
return;
}
char arch_str[32];
switch (arch) {
case ARM64: { strcpy(arch_str, "arm64-v8a"); break; }
case X86_64: { strcpy(arch_str, "x86_64"); break; }
case ARM32: { strcpy(arch_str, "armeabi-v7a"); break; }
case X86: { strcpy(arch_str, "x86"); break; }
}
LOGI("Loading modules for architecture: %s\n", arch_str);
struct dirent *entry;
while ((entry = readdir(dir)) != NULL) {
if (entry->d_type != DT_DIR) continue; /* INFO: Only directories */
if (strcmp(entry->d_name, ".") == 0 || strcmp(entry->d_name, "..") == 0 || strcmp(entry->d_name, "zygisksu") == 0) continue;
char *name = entry->d_name;
char so_path[PATH_MAX];
snprintf(so_path, PATH_MAX, "/data/adb/modules/%s/zygisk/%s.so", name, arch_str);
struct stat st;
if (stat(so_path, &st) == -1) {
errno = 0;
continue;
}
char disabled[PATH_MAX];
snprintf(disabled, PATH_MAX, "/data/adb/modules/%s/disable", name);
if (stat(disabled, &st) == -1) {
if (errno != ENOENT) {
LOGE("Failed checking if module `%s` is disabled: %s\n", name, strerror(errno));
errno = 0;
continue;
}
errno = 0;
} else continue;
int lib_fd = create_library_fd(so_path);
if (lib_fd == -1) {
LOGE("Failed loading module `%s`\n", name);
continue;
}
context->modules = realloc(context->modules, ((context->len + 1) * sizeof(struct Module)));
if (context->modules == NULL) {
LOGE("Failed reallocating memory for modules.\n");
return;
}
context->modules[context->len].name = strdup(name);
context->modules[context->len].lib_fd = lib_fd;
context->modules[context->len].companion = -1;
context->len++;
}
}
static void free_modules(struct Context *restrict context) {
for (int i = 0; i < context->len; i++) {
free(context->modules[i].name);
if (context->modules[i].companion != -1) close(context->modules[i].companion);
}
}
static int create_daemon_socket(void) {
set_socket_create_context("u:r:zygote:s0");
return unix_listener_from_path(PATH_CP_NAME);
}
static int spawn_companion(char *restrict argv[], char *restrict name, int lib_fd) {
int sockets[2];
if (socketpair(AF_UNIX, SOCK_STREAM, 0, sockets) == -1) {
LOGE("Failed creating socket pair.\n");
return -1;
}
int daemon_fd = sockets[0];
int companion_fd = sockets[1];
pid_t pid = fork();
if (pid < 0) {
LOGE("Failed forking companion: %s\n", strerror(errno));
close(companion_fd);
close(daemon_fd);
exit(1);
} else if (pid > 0) {
close(companion_fd);
int status = 0;
waitpid(pid, &status, 0);
if (WIFEXITED(status) && WEXITSTATUS(status) == 0) {
if (write_string(daemon_fd, name) == -1) {
LOGE("Failed writing module name.\n");
close(daemon_fd);
return -1;
}
if (write_fd(daemon_fd, lib_fd) == -1) {
LOGE("Failed sending library fd.\n");
close(daemon_fd);
return -1;
}
uint8_t response = 0;
ssize_t ret = read_uint8_t(daemon_fd, &response);
if (ret <= 0) {
LOGE("Failed reading companion response.\n");
close(daemon_fd);
return -1;
}
switch (response) {
/* INFO: Even without any entry, we should still just deal with it */
case 0: { return -2; }
case 1: { return daemon_fd; }
/* TODO: Should we be closing daemon socket here? (in non-0-and-1 case) */
default: {
return -1;
}
}
/* TODO: Should we be closing daemon socket here? */
} else {
LOGE("Exited with status %d\n", status);
return -1;
}
/* INFO: if pid == 0: */
} else {
/* INFO: There is no case where this will fail with a valid fd. */
/* INFO: Remove FD_CLOEXEC flag to avoid closing upon exec */
if (fcntl(companion_fd, F_SETFD, 0) == -1) {
LOGE("Failed removing FD_CLOEXEC flag: %s\n", strerror(errno));
close(companion_fd);
close(daemon_fd);
exit(1);
}
}
char *process = argv[0];
char nice_name[256];
char *last = strrchr(process, '/');
if (last == NULL) {
snprintf(nice_name, sizeof(nice_name), "%s", process);
} else {
snprintf(nice_name, sizeof(nice_name), "%s", last + 1);
}
char process_name[256];
snprintf(process_name, sizeof(process_name), "%s-%s", nice_name, name);
char companion_fd_str[32];
snprintf(companion_fd_str, sizeof(companion_fd_str), "%d", companion_fd);
char *eargv[] = { process_name, "companion", companion_fd_str, NULL };
if (non_blocking_execv(ZYGISKD_PATH, eargv) == -1) {
LOGE("Failed executing companion: %s\n", strerror(errno));
close(companion_fd);
exit(1);
}
exit(0);
}
struct __attribute__((__packed__)) MsgHead {
unsigned int cmd;
int length;
char data[0];
};
/* WARNING: Dynamic memory based */
void zygiskd_start(char *restrict argv[]) {
/* INFO: When implementation is None or Multiple, it won't set the values
for the context, causing it to have garbage values. In response
to that, "= { 0 }" is used to ensure that the values are clean. */
struct Context context = { 0 };
struct root_impl impl;
get_impl(&impl);
if (impl.impl == None || impl.impl == Multiple) {
struct MsgHead *msg = NULL;
if (impl.impl == None) {
msg = malloc(sizeof(struct MsgHead) + strlen("Unsupported environment: Unknown root implementation") + 1);
} else {
msg = malloc(sizeof(struct MsgHead) + strlen("Unsupported environment: Multiple root implementations found") + 1);
}
if (msg == NULL) {
LOGE("Failed allocating memory for message.\n");
return;
}
msg->cmd = DAEMON_SET_ERROR_INFO;
if (impl.impl == None) {
msg->length = sprintf(msg->data, "Unsupported environment: Unknown root implementation");
} else {
msg->length = sprintf(msg->data, "Unsupported environment: Multiple root implementations found");
}
unix_datagram_sendto(CONTROLLER_SOCKET, (void *)msg, sizeof(struct MsgHead) + msg->length);
free(msg);
} else {
enum Architecture arch = get_arch();
load_modules(arch, &context);
char *module_list = NULL;
size_t module_list_len = 0;
if (context.len == 0) {
module_list = strdup("None");
module_list_len = strlen("None");
} else {
for (int i = 0; i < context.len; i++) {
if (i != context.len - 1) {
module_list = realloc(module_list, module_list_len + strlen(context.modules[i].name) + strlen(", ") + 1);
if (module_list == NULL) {
LOGE("Failed reallocating memory for module list.\n");
return;
}
strcpy(module_list + module_list_len, context.modules[i].name);
module_list_len += strlen(context.modules[i].name);
strcpy(module_list + module_list_len, ", ");
module_list_len += strlen(", ");
} else {
module_list = realloc(module_list, module_list_len + strlen(context.modules[i].name) + 1);
if (module_list == NULL) {
LOGE("Failed reallocating memory for module list.\n");
return;
}
strcpy(module_list + module_list_len, context.modules[i].name);
module_list_len += strlen(context.modules[i].name);
}
}
}
char impl_name[LONGEST_ROOT_IMPL_NAME];
stringify_root_impl_name(impl, impl_name);
size_t msg_length = strlen("Root: , Modules: ") + strlen(impl_name) + module_list_len + 1;
struct MsgHead *msg = malloc(sizeof(struct MsgHead) + msg_length);
msg->length = snprintf(msg->data, msg_length, "Root: %s, Modules: %s", impl_name, module_list);
msg->cmd = DAEMON_SET_INFO;
unix_datagram_sendto(CONTROLLER_SOCKET, (void *)msg, sizeof(struct MsgHead) + msg->length);
free(msg);
free(module_list);
}
int socket_fd = create_daemon_socket();
if (socket_fd == -1) {
LOGE("Failed creating daemon socket\n");
return;
}
while (1) {
int client_fd = accept(socket_fd, NULL, NULL);
if (client_fd == -1) {
LOGE("accept: %s\n", strerror(errno));
return;
}
uint8_t action8 = 0;
ssize_t len = read_uint8_t(client_fd, &action8);
if (len == -1) {
LOGE("read: %s\n", strerror(errno));
return;
} else if (len == 0) {
LOGI("Client disconnected\n");
return;
}
enum DaemonSocketAction action = (enum DaemonSocketAction)action8;
switch (action) {
case PingHeartbeat: {
enum DaemonSocketAction msgr = ZYGOTE_INJECTED;
unix_datagram_sendto(CONTROLLER_SOCKET, &msgr, sizeof(enum DaemonSocketAction));
break;
}
case ZygoteRestart: {
for (int i = 0; i < context.len; i++) {
if (context.modules[i].companion != -1) {
close(context.modules[i].companion);
context.modules[i].companion = -1;
}
}
break;
}
case SystemServerStarted: {
enum DaemonSocketAction msgr = SYSTEM_SERVER_STARTED;
unix_datagram_sendto(CONTROLLER_SOCKET, &msgr, sizeof(enum DaemonSocketAction));
if (impl.impl == None || impl.impl == Multiple) {
LOGI("Unsupported environment detected. Exiting.\n");
close(client_fd);
close(socket_fd);
free_modules(&context);
exit(1);
}
break;
}
case RequestLogcatFd: {
uint8_t level = 0;
ssize_t ret = read_uint8_t(client_fd, &level);
ASSURE_SIZE_READ_BREAK("RequestLogcatFd", "level", ret, sizeof(level));
char tag[128 + 1];
ret = read_string(client_fd, tag, sizeof(tag) - 1);
if (ret == -1) {
LOGE("Failed reading logcat tag.\n");
close(client_fd);
break;
}
tag[ret] = '\0';
/* INFO: Non-NULL terminated */
char message[1024];
ret = read_string(client_fd, message, sizeof(message));
if (ret == -1) {
LOGE("Failed reading logcat message.\n");
close(client_fd);
break;
}
__android_log_print(level, tag, "%.*s", (int)ret, message);
break;
}
case GetProcessFlags: {
uint32_t uid = 0;
ssize_t ret = read_uint32_t(client_fd, &uid);
ASSURE_SIZE_READ_BREAK("GetProcessFlags", "uid", ret, sizeof(uid));
uint32_t flags = 0;
if (uid_is_manager(uid)) {
flags |= PROCESS_IS_MANAGER;
} else {
if (uid_granted_root(uid)) {
flags |= PROCESS_GRANTED_ROOT;
}
if (uid_should_umount(uid)) {
flags |= PROCESS_ON_DENYLIST;
}
}
switch (impl.impl) {
case None: { break; }
case Multiple: { break; }
case KernelSU: {
flags |= PROCESS_ROOT_IS_KSU;
break;
}
case APatch: {
flags |= PROCESS_ROOT_IS_APATCH;
break;
}
case Magisk: {
flags |= PROCESS_ROOT_IS_MAGISK;
break;
}
}
ret = write_int(client_fd, flags);
ASSURE_SIZE_WRITE_BREAK("GetProcessFlags", "flags", ret, sizeof(flags));
break;
}
case GetInfo: {
uint32_t flags = 0;
switch (impl.impl) {
case None: { break; }
case Multiple: { break; }
case KernelSU: {
flags |= PROCESS_ROOT_IS_KSU;
break;
}
case APatch: {
flags |= PROCESS_ROOT_IS_APATCH;
break;
}
case Magisk: {
flags |= PROCESS_ROOT_IS_MAGISK;
break;
}
}
ssize_t ret = write_size_t(client_fd, flags);
ASSURE_SIZE_WRITE_BREAK("GetInfo", "flags", ret, sizeof(flags));
uint32_t pid = getpid();
ret = write_uint32_t(client_fd, pid);
ASSURE_SIZE_WRITE_BREAK("GetInfo", "pid", ret, sizeof(pid));
size_t modules_len = context.len;
ret = write_size_t(client_fd, modules_len);
ASSURE_SIZE_WRITE_BREAK("GetInfo", "modules_len", ret, sizeof(modules_len));
for (size_t i = 0; i < modules_len; i++) {
ret = write_string(client_fd, context.modules[i].name);
if (ret == -1) {
LOGE("Failed writing module name.\n");
break;
}
}
break;
}
case ReadModules: {
size_t clen = context.len;
ssize_t ret = write_size_t(client_fd, clen);
ASSURE_SIZE_WRITE_BREAK("ReadModules", "len", ret, sizeof(clen));
for (size_t i = 0; i < clen; i++) {
if (write_string(client_fd, context.modules[i].name) == -1) {
LOGE("Failed writing module name.\n");
break;
}
if (write_fd(client_fd, context.modules[i].lib_fd) == -1) {
LOGE("Failed writing module fd.\n");
break;
}
}
break;
}
case RequestCompanionSocket: {
size_t index = 0;
ssize_t ret = read_size_t(client_fd, &index);
ASSURE_SIZE_READ_BREAK("RequestCompanionSocket", "index", ret, sizeof(index));
struct Module *module = &context.modules[index];
if (module->companion != -1) {
LOGI(" - Polling companion for module \"%s\"\n", module->name);
if (!check_unix_socket(module->companion, false)) {
LOGE(" - Poll companion for module \"%s\" crashed\n", module->name);
close(module->companion);
module->companion = -1;
}
}
if (module->companion == -1) {
module->companion = spawn_companion(argv, module->name, module->lib_fd);
if (module->companion > 0) {
LOGI(" - Spawned companion for \"%s\"\n", module->name);
} else {
if (module->companion == -2) {
LOGE(" - No companion spawned for \"%s\" because it has no entry.\n", module->name);
} else {
LOGE(" - Failed to spawn companion for \"%s\": %s\n", module->name, strerror(errno));
}
}
}
/*
INFO: Companion already exists or was created. In any way,
it should be in the while loop to receive fds now,
so just sending the file descriptor of the client is
safe.
*/
if (module->companion != -1) {
LOGI(" - Sending companion fd socket of module \"%s\"\n", module->name);
if (write_fd(module->companion, client_fd) == -1) {
LOGE(" - Failed to send companion fd socket of module \"%s\"\n", module->name);
ret = write_uint8_t(client_fd, 0);
ASSURE_SIZE_WRITE_BREAK("RequestCompanionSocket", "response", ret, sizeof(int));
close(module->companion);
module->companion = -1;
/* INFO: RequestCompanionSocket by defailt doesn't close the client_fd */
close(client_fd);
}
} else {
ret = write_uint8_t(client_fd, 0);
ASSURE_SIZE_WRITE_BREAK("RequestCompanionSocket", "response", ret, sizeof(int));
/* INFO: RequestCompanionSocket by defailt doesn't close the client_fd */
close(client_fd);
}
break;
}
case GetModuleDir: {
size_t index = 0;
ssize_t ret = read_size_t(client_fd, &index);
ASSURE_SIZE_READ_BREAK("GetModuleDir", "index", ret, sizeof(index));
char module_dir[PATH_MAX];
snprintf(module_dir, PATH_MAX, "%s/%s", PATH_MODULES_DIR, context.modules[index].name);
int fd = open(module_dir, O_RDONLY);
if (fd == -1) {
LOGE("Failed opening module directory \"%s\": %s\n", module_dir, strerror(errno));
break;
}
struct stat st;
if (fstat(fd, &st) == -1) {
LOGE("Failed getting module directory \"%s\" stats: %s\n", module_dir, strerror(errno));
close(fd);
break;
}
if (write_fd(client_fd, fd) == -1) {
LOGE("Failed sending module directory \"%s\" fd: %s\n", module_dir, strerror(errno));
close(fd);
break;
}
break;
}
}
if (action != RequestCompanionSocket && action != RequestLogcatFd) close(client_fd);
continue;
}
close(socket_fd);
free_modules(&context);
}

6
zygiskd/src/zygiskd.h Normal file
View File

@@ -0,0 +1,6 @@
#ifndef ZYGISKD_H
#define ZYGISKD_H
void zygiskd_start(char *restrict argv[]);
#endif /* ZYGISKD_H */

351
zygiskd/src/zygiskd.rs
View File

@@ -1,351 +0,0 @@
use crate::constants::{DaemonSocketAction, ProcessFlags};
use crate::utils::{check_unix_socket, LateInit, UnixStreamExt};
use crate::{constants, lp_select, root_impl, utils};
use anyhow::{bail, Result};
use log::{debug, error, info, trace, warn};
use passfd::FdPassingExt;
use rustix::fs::{fcntl_setfd, FdFlags};
use std::fs;
use std::io::Error;
use std::ops::Deref;
use std::os::fd::{AsFd, OwnedFd, RawFd};
use std::os::unix::process::CommandExt;
use std::os::unix::{
net::{UnixListener, UnixStream},
prelude::AsRawFd,
};
use std::path::PathBuf;
use std::process::{exit, Command};
use std::sync::{Arc, Mutex};
use std::thread;
struct Module {
name: String,
lib_fd: OwnedFd,
companion: Mutex<Option<Option<UnixStream>>>,
}
struct Context {
modules: Vec<Module>,
}
static TMP_PATH: LateInit<String> = LateInit::new();
static CONTROLLER_SOCKET: LateInit<String> = LateInit::new();
static PATH_CP_NAME: LateInit<String> = LateInit::new();
pub fn main() -> Result<()> {
info!("Welcome to ReZygisk ({}) !", constants::ZKSU_VERSION);
TMP_PATH.init(std::env::var("TMP_PATH")?);
CONTROLLER_SOCKET.init(format!("{}/init_monitor", TMP_PATH.deref()));
PATH_CP_NAME.init(format!(
"{}/{}",
TMP_PATH.deref(),
lp_select!("/cp32.sock", "/cp64.sock")
));
let arch = get_arch()?;
debug!("Daemon architecture: {arch}");
let modules = load_modules(arch)?;
{
let mut msg = Vec::<u8>::new();
let info = match root_impl::get_impl() {
root_impl::RootImpl::KernelSU | root_impl::RootImpl::Magisk | root_impl::RootImpl::APatch => {
msg.extend_from_slice(&constants::DAEMON_SET_INFO.to_le_bytes());
let module_names: Vec<_> = modules.iter().map(|m| m.name.as_str()).collect();
format!(
"Root: {:?},module({}): {}",
root_impl::get_impl(),
modules.len(),
module_names.join(",")
)
}
_ => {
msg.extend_from_slice(&constants::DAEMON_SET_ERROR_INFO.to_le_bytes());
format!("Invalid root implementation: {:?}", root_impl::get_impl())
}
};
msg.extend_from_slice(&(info.len() as u32 + 1).to_le_bytes());
msg.extend_from_slice(info.as_bytes());
msg.extend_from_slice(&[0u8]);
utils::unix_datagram_sendto(&CONTROLLER_SOCKET, msg.as_slice())
.expect("failed to send info");
}
let context = Context { modules };
let context = Arc::new(context);
let listener = create_daemon_socket()?;
for stream in listener.incoming() {
let mut stream = stream?;
let context = Arc::clone(&context);
let action = stream.read_u8()?;
let action = DaemonSocketAction::try_from(action)?;
trace!("New daemon action {:?}", action);
match action {
DaemonSocketAction::PingHeartbeat => {
let value = constants::ZYGOTE_INJECTED;
utils::unix_datagram_sendto(&CONTROLLER_SOCKET, &value.to_le_bytes())?;
}
DaemonSocketAction::ZygoteRestart => {
info!("Zygote restarted, clean up companions");
for module in &context.modules {
let mut companion = module.companion.lock().unwrap();
companion.take();
}
}
DaemonSocketAction::SystemServerStarted => {
let value = constants::SYSTEM_SERVER_STARTED;
utils::unix_datagram_sendto(&CONTROLLER_SOCKET, &value.to_le_bytes())?;
}
_ => {
thread::spawn(move || {
if let Err(e) = handle_daemon_action(action, stream, &context) {
warn!("Error handling daemon action: {}\n{}", e, e.backtrace());
}
});
}
}
}
Ok(())
}
fn get_arch() -> Result<&'static str> {
let system_arch = utils::get_property("ro.product.cpu.abi")?;
if system_arch.contains("arm") {
return Ok(lp_select!("armeabi-v7a", "arm64-v8a"));
}
if system_arch.contains("x86") {
return Ok(lp_select!("x86", "x86_64"));
}
bail!("Unsupported system architecture: {}", system_arch);
}
fn load_modules(arch: &str) -> Result<Vec<Module>> {
let mut modules = Vec::new();
let dir = match fs::read_dir(constants::PATH_MODULES_DIR) {
Ok(dir) => dir,
Err(e) => {
warn!("Failed reading modules directory: {}", e);
return Ok(modules);
}
};
for entry in dir.into_iter() {
let entry = entry?;
let name = entry.file_name().into_string().unwrap();
let so_path = entry.path().join(format!("zygisk/{arch}.so"));
let disabled = entry.path().join("disable");
if !so_path.exists() || disabled.exists() {
continue;
}
info!(" Loading module `{name}`...");
let lib_fd = match create_library_fd(&so_path) {
Ok(fd) => fd,
Err(e) => {
warn!(" Failed to create memfd for `{name}`: {e}");
continue;
}
};
let companion = Mutex::new(None);
let module = Module {
name,
lib_fd,
companion,
};
modules.push(module);
}
Ok(modules)
}
fn create_library_fd(so_path: &PathBuf) -> Result<OwnedFd> {
let opts = memfd::MemfdOptions::default().allow_sealing(true);
let memfd = opts.create("jit-cache-zygisk")?;
let file = fs::File::open(so_path)?;
let mut reader = std::io::BufReader::new(file);
let mut writer = memfd.as_file();
std::io::copy(&mut reader, &mut writer)?;
let mut seals = memfd::SealsHashSet::new();
seals.insert(memfd::FileSeal::SealShrink);
seals.insert(memfd::FileSeal::SealGrow);
seals.insert(memfd::FileSeal::SealWrite);
seals.insert(memfd::FileSeal::SealSeal);
memfd.add_seals(&seals)?;
Ok(OwnedFd::from(memfd.into_file()))
}
fn create_daemon_socket() -> Result<UnixListener> {
utils::set_socket_create_context("u:r:zygote:s0")?;
let listener = utils::unix_listener_from_path(&PATH_CP_NAME)?;
Ok(listener)
}
fn spawn_companion(name: &str, lib_fd: RawFd) -> Result<Option<UnixStream>> {
let (mut daemon, companion) = UnixStream::pair()?;
// FIXME: avoid getting self path from arg0
let process = std::env::args().next().unwrap();
let nice_name = process.split('/').last().unwrap();
unsafe {
let pid = libc::fork();
if pid < 0 {
bail!(Error::last_os_error());
} else if pid > 0 {
drop(companion);
let mut status: libc::c_int = 0;
libc::waitpid(pid, &mut status, 0);
if libc::WIFEXITED(status) && libc::WEXITSTATUS(status) == 0 {
daemon.write_string(name)?;
daemon.send_fd(lib_fd)?;
return match daemon.read_u8()? {
0 => Ok(None),
1 => Ok(Some(daemon)),
_ => bail!("Invalid companion response"),
};
} else {
bail!("exited with status {}", status);
}
} else {
// Remove FD_CLOEXEC flag
fcntl_setfd(companion.as_fd(), FdFlags::empty())?;
}
}
Command::new(&process)
.arg0(format!("{}-{}", nice_name, name))
.arg("companion")
.arg(format!("{}", companion.as_raw_fd()))
.spawn()?;
exit(0)
}
fn handle_daemon_action(
action: DaemonSocketAction,
mut stream: UnixStream,
context: &Context,
) -> Result<()> {
match action {
DaemonSocketAction::RequestLogcatFd => loop {
let level = match stream.read_u8() {
Ok(level) => level,
Err(_) => break,
};
let tag = stream.read_string()?;
let message = stream.read_string()?;
utils::log_raw(level as i32, &tag, &message)?;
},
DaemonSocketAction::GetProcessFlags => {
let uid = stream.read_u32()? as i32;
let mut flags = ProcessFlags::empty();
if root_impl::uid_is_manager(uid) {
flags |= ProcessFlags::PROCESS_IS_MANAGER;
} else {
if root_impl::uid_granted_root(uid) {
flags |= ProcessFlags::PROCESS_GRANTED_ROOT;
}
if root_impl::uid_should_umount(uid) {
flags |= ProcessFlags::PROCESS_ON_DENYLIST;
}
}
match root_impl::get_impl() {
root_impl::RootImpl::KernelSU => flags |= ProcessFlags::PROCESS_ROOT_IS_KSU,
root_impl::RootImpl::Magisk => flags |= ProcessFlags::PROCESS_ROOT_IS_MAGISK,
root_impl::RootImpl::APatch => flags |= ProcessFlags::PROCESS_ROOT_IS_APATCH,
_ => panic!("wrong root impl: {:?}", root_impl::get_impl()),
}
trace!(
"Uid {} granted root: {}",
uid,
flags.contains(ProcessFlags::PROCESS_GRANTED_ROOT)
);
trace!(
"Uid {} on denylist: {}",
uid,
flags.contains(ProcessFlags::PROCESS_ON_DENYLIST)
);
stream.write_u32(flags.bits())?;
}
DaemonSocketAction::GetInfo => {
let mut flags = ProcessFlags::empty();
match root_impl::get_impl() {
root_impl::RootImpl::KernelSU => flags |= ProcessFlags::PROCESS_ROOT_IS_KSU,
root_impl::RootImpl::Magisk => flags |= ProcessFlags::PROCESS_ROOT_IS_MAGISK,
root_impl::RootImpl::APatch => flags |= ProcessFlags::PROCESS_ROOT_IS_APATCH,
_ => panic!("wrong root impl: {:?}", root_impl::get_impl()),
}
stream.write_u32(flags.bits())?;
stream.write_usize(context.modules.len())?;
for module in context.modules.iter() {
stream.write_string(&module.name)?;
}
}
DaemonSocketAction::ReadModules => {
stream.write_usize(context.modules.len())?;
for module in context.modules.iter() {
stream.write_string(&module.name)?;
stream.send_fd(module.lib_fd.as_raw_fd())?;
}
}
DaemonSocketAction::RequestCompanionSocket => {
let index = stream.read_usize()?;
let module = &context.modules[index];
let mut companion = module.companion.lock().unwrap();
if let Some(Some(sock)) = companion.as_ref() {
if !check_unix_socket(sock, false) {
error!("Poll companion for module `{}` crashed", module.name);
companion.take();
}
}
if companion.is_none() {
match spawn_companion(&module.name, module.lib_fd.as_raw_fd()) {
Ok(c) => {
if c.is_some() {
trace!(" Spawned companion for `{}`", module.name);
} else {
trace!(
" No companion spawned for `{}` because it has not entry",
module.name
);
}
*companion = Some(c);
}
Err(e) => {
warn!(" Failed to spawn companion for `{}`: {}", module.name, e);
}
};
}
match companion.as_ref() {
Some(Some(sock)) => {
if let Err(e) = sock.send_fd(stream.as_raw_fd()) {
error!(
"Failed to send companion fd socket of module `{}`: {}",
module.name, e
);
stream.write_u8(0)?;
}
// Ok: Send by companion
}
_ => {
stream.write_u8(0)?;
}
}
}
DaemonSocketAction::GetModuleDir => {
let index = stream.read_usize()?;
let module = &context.modules[index];
let dir = format!("{}/{}", constants::PATH_MODULES_DIR, module.name);
let dir = fs::File::open(dir)?;
stream.send_fd(dir.as_raw_fd())?;
}
_ => {}
}
Ok(())
}