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syscall hook

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This commit is contained in:
Andrea Fioraldi 2021-07-15 10:47:28 +02:00
parent ea89e5a32c
commit beb8bf68be
1 changed files with 21 additions and 14 deletions
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19
linux-user/syscall.c
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@ -13256,8 +13256,13 @@ static abi_long do_syscall1(void *cpu_env, int num, abi_long arg1,
//// --- Begin LibAFL code ---
int (*libafl_syscall_hook)(uint64_t*, int, uint64_t, uint64_t, uint64_t,
uint64_t, uint64_t, uint64_t, uint64_t, uint64_t);
struct syshook_ret {
uint64_t retval;
bool skip_syscall;
};
struct syshook_ret (*libafl_syscall_hook)(int, uint64_t, uint64_t, uint64_t,
uint64_t, uint64_t, uint64_t,
uint64_t, uint64_t);
//// --- End LibAFL code ---
@ -13292,8 +13297,8 @@ abi_long do_syscall(void *cpu_env, int num, abi_long arg1,
//// --- Begin LibAFL code ---
uint64_t ret64;
if (libafl_syscall_hook && libafl_syscall_hook(&ret64, num,
if (libafl_syscall_hook) {
struct syshook_ret hook_ret = libafl_syscall_hook(num,
(uint64_t)arg1,
(uint64_t)arg2,
(uint64_t)arg3,
@ -13301,10 +13306,12 @@ abi_long do_syscall(void *cpu_env, int num, abi_long arg1,
(uint64_t)arg5,
(uint64_t)arg6,
(uint64_t)arg7,
(uint64_t)arg8)) {
ret = (abi_ulong)ret64;
(uint64_t)arg8);
if (hook_ret.skip_syscall) {
ret = (abi_ulong)hook_ret.retval;
goto after_syscall;
}
}
//// --- End LibAFL code ---