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Added setresuid hook for older Android versions

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snake-4
2024-04-16 22:43:03 +02:00
parent a7701e8b11
commit 5e8a2c4631
1 changed files with 16 additions and 0 deletions
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16
module/jni/main.cpp
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@@ -46,6 +46,16 @@ DCL_HOOK_FUNC(static int, unshare, int flags)
return old_unshare(flags); return old_unshare(flags);
} }
/*
* The reason why we hook setresuid is because so far it has been unconditionally called
* and we still have CAP_SYS_ADMIN during this call.
*/
DCL_HOOK_FUNC(static int, setresuid, uid_t ruid, uid_t euid, uid_t suid)
{
callbackFunction();
return old_setresuid(ruid, euid, suid);
}
class ZygiskModule : public zygisk::ModuleBase class ZygiskModule : public zygisk::ModuleBase
{ {
public: public:
@@ -82,6 +92,7 @@ public:
ASSERT_EXIT("preAppSpecialize", mount("rootfs", "/", NULL, (MS_SLAVE | MS_REC), NULL) != -1, return); ASSERT_EXIT("preAppSpecialize", mount("rootfs", "/", NULL, (MS_SLAVE | MS_REC), NULL) != -1, return);
ASSERT_EXIT("preAppSpecialize", hookPLTByName("libandroid_runtime.so", "unshare", new_unshare, &old_unshare), return); ASSERT_EXIT("preAppSpecialize", hookPLTByName("libandroid_runtime.so", "unshare", new_unshare, &old_unshare), return);
ASSERT_EXIT("preAppSpecialize", hookPLTByName("libandroid_runtime.so", "setresuid", new_setresuid, &old_setresuid), return);
ASSERT_LOG("preAppSpecialize", (companionFd = api->connectCompanion()) != -1); ASSERT_LOG("preAppSpecialize", (companionFd = api->connectCompanion()) != -1);
@@ -107,6 +118,9 @@ public:
doUnmount(); doUnmount();
doRemount(); doRemount();
} }
// Call only once per process.
callbackFunction = []() {};
}; };
} }
@@ -119,6 +133,8 @@ public:
{ {
if (old_unshare != nullptr) if (old_unshare != nullptr)
ASSERT_LOG("postAppSpecialize", hookPLTByName("libandroid_runtime.so", "unshare", old_unshare)); ASSERT_LOG("postAppSpecialize", hookPLTByName("libandroid_runtime.so", "unshare", old_unshare));
if (old_setresuid != nullptr)
ASSERT_LOG("postAppSpecialize", hookPLTByName("libandroid_runtime.so", "setresuid", old_setresuid));
} }
template <typename T> template <typename T>