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82 lines
2.3 KiB
C++
82 lines
2.3 KiB
C++
#include <unistd.h>
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#include <sched.h>
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#include <sys/mount.h>
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#include "zygisk.hpp"
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#include "logging.hpp"
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#include "android_filesystem_config.h"
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using zygisk::Api;
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using zygisk::AppSpecializeArgs;
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using zygisk::ServerSpecializeArgs;
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void do_unmount();
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static int shouldSkipUid(int uid)
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{
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int appid = uid % AID_USER_OFFSET;
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if (appid >= AID_APP_START && appid <= AID_APP_END)
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return false;
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if (appid >= AID_ISOLATED_START && appid <= AID_ISOLATED_END)
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return false;
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return true;
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}
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class ZygiskModule : public zygisk::ModuleBase
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{
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public:
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void onLoad(Api *api, JNIEnv *env) override
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{
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this->api = api;
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this->env = env;
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}
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void preAppSpecialize(AppSpecializeArgs *args) override
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{
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api->setOption(zygisk::Option::DLCLOSE_MODULE_LIBRARY);
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uint32_t flags = api->getFlags();
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bool isRoot = (flags & zygisk::StateFlag::PROCESS_GRANTED_ROOT) != 0;
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bool isOnDenylist = (flags & zygisk::StateFlag::PROCESS_ON_DENYLIST) != 0;
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if (isRoot || !isOnDenylist || shouldSkipUid(args->uid))
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{
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LOGD("Skipping pid=%d uid=%d", getpid(), args->uid);
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return;
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}
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LOGD("Unmounting in preAppSpecialize for pid=%d uid=%d", getpid(), args->uid);
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/*
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* Create only one namespace per zygote, child Zygotes will inherit it
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* But then again, why won't they also inherit the unmounts of the parent?
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* Either way, unshare in child Zygote will crash at the open FD sanity check.
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*/
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if (!*args->is_child_zygote)
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{
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LOGD("Creating new mount namespace for parent pid=%d uid=%d", getpid(), args->uid);
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/*
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* Mount the pseudo app mount namespace's root as MS_SLAVE, so every mount/umount from
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* Zygote shared pre-specialization mountspace is propagated to this one.
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*/
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if (mount("rootfs", "/", NULL, (MS_SLAVE | MS_REC), NULL) == -1)
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{
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LOGE("mount(\"rootfs\", \"/\", NULL, (MS_SLAVE | MS_REC), NULL) returned -1");
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}
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do_unmount();
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}
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void preServerSpecialize(ServerSpecializeArgs *args) override
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{
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api->setOption(zygisk::Option::DLCLOSE_MODULE_LIBRARY);
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}
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private:
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Api *api;
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JNIEnv *env;
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};
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REGISTER_ZYGISK_MODULE(ZygiskModule)
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