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Pre and post syscall hooks

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This commit is contained in:
Andrea Fioraldi 2021-12-22 15:15:48 +01:00
parent a6b44da636
commit 4e5821fd56
1 changed files with 21 additions and 5 deletions
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26
linux-user/syscall.c
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@ -13193,9 +13193,12 @@ struct syshook_ret {
uint64_t retval; uint64_t retval;
bool skip_syscall; bool skip_syscall;
}; };
struct syshook_ret (*libafl_syscall_hook)(int, uint64_t, uint64_t, uint64_t, struct syshook_ret (*libafl_pre_syscall_hook)(int, uint64_t, uint64_t, uint64_t,
uint64_t, uint64_t, uint64_t, uint64_t, uint64_t, uint64_t,
uint64_t, uint64_t); uint64_t, uint64_t);
uint64_t (*libafl_post_syscall_hook)(uint64_t, int, uint64_t, uint64_t,
uint64_t, uint64_t, uint64_t, uint64_t,
uint64_t, uint64_t);
//// --- End LibAFL code --- //// --- End LibAFL code ---
@ -13230,8 +13233,8 @@ abi_long do_syscall(void *cpu_env, int num, abi_long arg1,
//// --- Begin LibAFL code --- //// --- Begin LibAFL code ---
if (libafl_syscall_hook) { if (libafl_pre_syscall_hook) {
struct syshook_ret hook_ret = libafl_syscall_hook(num, struct syshook_ret hook_ret = libafl_pre_syscall_hook(num,
(uint64_t)arg1, (uint64_t)arg1,
(uint64_t)arg2, (uint64_t)arg2,
(uint64_t)arg3, (uint64_t)arg3,
@ -13252,6 +13255,19 @@ abi_long do_syscall(void *cpu_env, int num, abi_long arg1,
arg5, arg6, arg7, arg8); arg5, arg6, arg7, arg8);
//// --- Begin LibAFL code --- //// --- Begin LibAFL code ---
if (libafl_post_syscall_hook) {
ret = (abi_ulong)libafl_post_syscall_hook((uint64_t)ret, num,
(uint64_t)arg1,
(uint64_t)arg2,
(uint64_t)arg3,
(uint64_t)arg4,
(uint64_t)arg5,
(uint64_t)arg6,
(uint64_t)arg7,
(uint64_t)arg8);
}
after_syscall: after_syscall:
//// --- End LibAFL code --- //// --- End LibAFL code ---