88 lines
3.1 KiB
C
88 lines
3.1 KiB
C
#include "libafl/hooks/syscall.h"
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struct libafl_pre_syscall_hook* libafl_pre_syscall_hooks;
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size_t libafl_pre_syscall_hooks_num = 0;
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struct libafl_post_syscall_hook* libafl_post_syscall_hooks;
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size_t libafl_post_syscall_hooks_num = 0;
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GEN_REMOVE_HOOK1(pre_syscall)
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GEN_REMOVE_HOOK1(post_syscall)
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size_t libafl_add_pre_syscall_hook(libafl_pre_syscall_cb callback,
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uint64_t data)
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{
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struct libafl_pre_syscall_hook* hook =
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calloc(sizeof(struct libafl_pre_syscall_hook), 1);
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hook->callback = callback;
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hook->data = data;
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hook->num = libafl_pre_syscall_hooks_num++;
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hook->next = libafl_pre_syscall_hooks;
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libafl_pre_syscall_hooks = hook;
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return hook->num;
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}
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size_t libafl_add_post_syscall_hook(
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target_ulong (*callback)(uint64_t data, target_ulong ret, int sys_num,
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target_ulong arg0, target_ulong arg1,
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target_ulong arg2, target_ulong arg3,
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target_ulong arg4, target_ulong arg5,
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target_ulong arg6, target_ulong arg7),
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uint64_t data)
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{
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struct libafl_post_syscall_hook* hook =
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calloc(sizeof(struct libafl_post_syscall_hook), 1);
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hook->callback = callback;
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hook->data = data;
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hook->num = libafl_post_syscall_hooks_num++;
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hook->next = libafl_post_syscall_hooks;
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libafl_post_syscall_hooks = hook;
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return hook->num;
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}
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bool libafl_hook_syscall_pre_run(CPUArchState* env, int num, abi_long arg1,
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abi_long arg2, abi_long arg3, abi_long arg4,
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abi_long arg5, abi_long arg6, abi_long arg7,
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abi_long arg8, abi_long* ret)
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{
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bool skip_syscall = false;
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struct libafl_pre_syscall_hook* h = libafl_pre_syscall_hooks;
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while (h) {
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// no null check
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struct libafl_syshook_ret hook_ret = h->callback(
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h->data, num, (target_ulong)arg1, (target_ulong)arg2,
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(target_ulong)arg3, (target_ulong)arg4, (target_ulong)arg5,
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(target_ulong)arg6, (target_ulong)arg7, (target_ulong)arg8);
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if (hook_ret.tag == LIBAFL_SYSHOOK_SKIP) {
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skip_syscall = true;
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*ret = (abi_ulong)hook_ret.syshook_skip_retval;
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}
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h = h->next;
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}
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return skip_syscall;
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}
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void libafl_hook_syscall_post_run(int num, abi_long arg1, abi_long arg2,
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abi_long arg3, abi_long arg4, abi_long arg5,
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abi_long arg6, abi_long arg7, abi_long arg8,
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abi_long* ret)
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{
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struct libafl_post_syscall_hook* p = libafl_post_syscall_hooks;
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while (p) {
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// no null check
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*ret = (abi_ulong)p->callback(p->data, (target_ulong)*ret, num,
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(target_ulong)arg1, (target_ulong)arg2,
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(target_ulong)arg3, (target_ulong)arg4,
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(target_ulong)arg5, (target_ulong)arg6,
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(target_ulong)arg7, (target_ulong)arg8);
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p = p->next;
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}
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}
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