remove: ReZygiskd dl.c

This commit removes the "dl.c" file, which was used for using "android_dlopen_ext" in a new namespace, used to isolate libraries, which is not necessary here as they are on different processes, hence "dlopen" can be used.

zygiskd/build.gradle.kts

@@ -51,7 +51,6 @@ val Files = arrayOf(
   "root_impl/kernelsu.c",
   "root_impl/magisk.c",
   "companion.c",
-  "dl.c",
   "main.c",
   "utils.c",
   "zygiskd.c"

zygiskd/src/companion.c

@@ -15,7 +15,6 @@
 
 #include <android/log.h>
 
-#include "dl.h"
 #include "utils.h"
 
 #undef LOG_TAG
@@ -32,7 +31,7 @@ zygisk_companion_entry load_module(int fd) {
   char path[PATH_MAX];
   snprintf(path, sizeof(path), "/proc/self/fd/%d", fd);
 
-  void *handle = dlopen_ext(path, RTLD_NOW);
+  void *handle = dlopen(path, RTLD_NOW);
 
   if (!handle) return NULL;
 

zygiskd/src/dl.c

@@ -1,57 +0,0 @@
-#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 <android/dlext.h>
-
-#include "companion.h"
-#include "utils.h"
-
-#define __LOADER_ANDROID_CREATE_NAMESPACE_TYPE(name) struct android_namespace_t *(*name)( \
-  const char *name,                                                                      \
-  const char *ld_library_path,                                                           \
-  const char *default_library_path,                                                      \
-  uint64_t type,                                                                         \
-  const char *permitted_when_isolated_path,                                              \
-  struct android_namespace_t *parent,                                                    \
-  const void *caller_addr)
-
-void *dlopen_ext(const char* path, int flags) {
-  android_dlextinfo info = { 0 };
-  char *dir = dirname(path);
-
-  __LOADER_ANDROID_CREATE_NAMESPACE_TYPE(__loader_android_create_namespace) = (__LOADER_ANDROID_CREATE_NAMESPACE_TYPE( ))dlsym(RTLD_DEFAULT, "__loader_android_create_namespace");
-
-  struct android_namespace_t *ns = __loader_android_create_namespace == NULL ? NULL :
-              __loader_android_create_namespace(path, dir, NULL,
-                                                2, /* ANDROID_NAMESPACE_TYPE_SHARED */
-                                                NULL, NULL,
-                                                (void *)&dlopen_ext);
-
-  if (ns) {
-    info.flags = ANDROID_DLEXT_USE_NAMESPACE;
-    info.library_namespace = ns;
-
-    LOGI("Open %s with namespace %p", path, (void *)ns);
-  } else {
-    LOGW("Cannot create namespace for %s", path);
-  }
-
-  void *handle = android_dlopen_ext(path, flags, &info);
-  if (handle) {
-    LOGI("dlopen %s: %p", path, handle);
-  } else {
-    LOGE("dlopen %s: %s", path, dlerror());
-  }
-
-  return handle;
-}

zygiskd/src/dl.h

@@ -1,6 +0,0 @@
-#ifndef DL_H
-#define DL_H
-
-void *dlopen_ext(char *path, int flags);
-
-#endif /* DL_H */