iOS - crash after hook

[suale-dev]

I built the lib for ios in debug mode. And build a demo iOS app with objective-c
Below is my function to test hook:

char *(*Origin_getenv)(const char *);
char *Hooked_getenv(const char *name) {
if (!strcmp(name, "lody")) {
return strdup("are you ok?");
}
char *(*O)(const char *) = Origin_getenv;
return O(name);
}

int testHook() {
void *handle = dlopen("libc.dylib", RTLD_NOW);
assert(handle != nullptr);
void *symbol = dlsym(handle, "getenv");
assert(symbol != nullptr);
WInlineHookFunction(
symbol,
reinterpret_cast<void *>(Hooked_getenv),
reinterpret_cast<void **>(&Origin_getenv)
);
const char *val = getenv("lody");
if (val != nullptr) {
std::cout << val;
}
return 0;
}

After call testHook function, hooked function work, but the app is crashed later.

iOS 12 - iPhone 6 & iPhone 7.

[fettdrac]

Whale的WInlineHook调用原过程基本会崩溃，老bug了，可能是恢复现场那段shellcode写的有问题，不会汇编也咱也没法修，我都是下源码加个Cyida Hook库替换着凑合用的（Android）

[liumengdeqq]

等待大佬新内核突破写权限