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Unhook unshare at postAppSpecialize

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snake-4
2024-04-14 16:21:52 +02:00
parent df3e492391
commit ac910f0ebe
1 changed files with 19 additions and 5 deletions
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24
module/jni/main.cpp
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@@ -35,6 +35,7 @@ public:
void preAppSpecialize(AppSpecializeArgs *args) override
{
isHooked = false;
api->setOption(zygisk::Option::DLCLOSE_MODULE_LIBRARY);
uint32_t flags = api->getFlags();
@@ -54,11 +55,12 @@ public:
* The logic behind whether there's going to be an unshare or not changes with each major Android version.
* For maximum compatibility, we will always unshare but prevent further unshare by this Zygote fork in appSpecialize.
*/
if (!plt_hook_wrapper("libandroid_runtime.so", "unshare", new_unshare, old_unshare))
if (!plt_hook_wrapper("libandroid_runtime.so", "unshare", new_unshare, (void **)&old_unshare))
{
LOGE("plt_hook_wrapper(\"libandroid_runtime.so\", \"unshare\", new_unshare, old_unshare) returned false");
return;
}
isHooked = true;
/*
* preAppSpecialize is before any possible unshare calls.
@@ -77,7 +79,7 @@ public:
*/
if (mount("rootfs", "/", NULL, (MS_SLAVE | MS_REC), NULL) == -1)
{
LOGE("mount(\"rootfs\", \"/\", NULL, (MS_SLAVE | MS_REC), NULL) returned -1");
LOGE("mount(\"rootfs\", \"/\", NULL, (MS_SLAVE | MS_REC), NULL) returned -1: %d (%s)", errno, strerror(errno));
return;
}
@@ -89,13 +91,25 @@ public:
api->setOption(zygisk::Option::DLCLOSE_MODULE_LIBRARY);
}
template <typename Return, typename... Args>
bool plt_hook_wrapper(const std::string &libName, const std::string &symbolName, Return (&hookFunction)(Args...), Return (*&originalFunction)(Args...))
void postAppSpecialize(const AppSpecializeArgs *args) override
{
return hook_plt_by_name(api, libName, symbolName, (void *)&hookFunction, (void **)&originalFunction) && api->pltHookCommit();
if (isHooked)
{
if (!plt_hook_wrapper("libandroid_runtime.so", "unshare", old_unshare, nullptr))
{
LOGE("plt_hook_wrapper(\"libandroid_runtime.so\", \"unshare\", old_unshare, nullptr) returned false");
return;
}
}
}
bool plt_hook_wrapper(const std::string &libName, const std::string &symbolName, void *hookFunction, void **originalFunction)
{
return hook_plt_by_name(api, libName, symbolName, hookFunction, originalFunction) && api->pltHookCommit();
}
private:
bool isHooked = false;
Api *api;
JNIEnv *env;
};