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Use ANDROID_DLEXT_FORCE_LOAD to load second stage if possible

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Fix #6095
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残页 2022-08-08 17:43:19 +08:00 committed by GitHub
parent 52ba6d11bc
commit 1735a713cb
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1 changed files with 20 additions and 10 deletions
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30
native/src/zygisk/entry.cpp
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@ -51,16 +51,20 @@ static void *unload_first_stage(void *) {
return nullptr;
}
#if defined(__LP64__)
// Use symlink to workaround linker bug on old broken Android
// https://issuetracker.google.com/issues/36914295
#define SECOND_STAGE_PATH "/system/bin/app_process"
#else
#define SECOND_STAGE_PATH "/system/bin/app_process32"
#endif
static void second_stage_entry() {
zygisk_logging();
ZLOGD("inject 2nd stage\n");
MAGISKTMP = getenv(MAGISKTMP_ENV);
#if defined(__LP64__)
self_handle = dlopen("/system/bin/app_process", RTLD_NOLOAD);
#else
self_handle = dlopen("/system/bin/app_process32", RTLD_NOLOAD);
#endif
self_handle = dlopen(SECOND_STAGE_PATH, RTLD_NOLOAD);
dlclose(self_handle);
unsetenv(MAGISKTMP_ENV);
@ -81,12 +85,18 @@ static void first_stage_entry() {
}
// Load second stage
android_dlextinfo info {
.flags = ANDROID_DLEXT_FORCE_LOAD
};
setenv(INJECT_ENV_2, "1", 1);
#if defined(__LP64__)
dlopen("/system/bin/app_process", RTLD_LAZY);
#else
dlopen("/system/bin/app_process32", RTLD_LAZY);
#endif
if (android_dlopen_ext(SECOND_STAGE_PATH, RTLD_LAZY, &info) == nullptr) {
// Android 5.x doesn't support ANDROID_DLEXT_FORCE_LOAD
ZLOGI("ANDROID_DLEXT_FORCE_LOAD is not supported, fallback to dlopen\n");
if (dlopen(SECOND_STAGE_PATH, RTLD_LAZY) == nullptr) {
ZLOGE("Cannot load the second stage\n");
unsetenv(INJECT_ENV_2);
}
}
}
[[gnu::constructor]] [[maybe_unused]]