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Add intercept hook after kernel syscall completes #103

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Add intercept hook after kernel syscall completes #103

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5 changes: 5 additions & 0 deletions include/libsyscall_intercept_hook_point.h
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Original file line number Diff line number Diff line change
Expand Up @@ -59,6 +59,11 @@ extern int (*intercept_hook_point)(long syscall_number,

extern void (*intercept_hook_point_clone_child)(void);
extern void (*intercept_hook_point_clone_parent)(long pid);
extern void (*intercept_hook_point_post_kernel)(long syscall_number,
long arg0, long arg1,
long arg2, long arg3,
long arg4, long arg5,
long result);

/*
* syscall_no_intercept - syscall without interception
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22 changes: 22 additions & 0 deletions src/intercept.c
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Original file line number Diff line number Diff line change
Expand Up @@ -71,6 +71,12 @@ void (*intercept_hook_point_clone_child)(void)
__attribute__((visibility("default")));
void (*intercept_hook_point_clone_parent)(long)
__attribute__((visibility("default")));
void (*intercept_hook_point_post_kernel)(long syscall_number,
long arg0, long arg1,
long arg2, long arg3,
long arg4, long arg5,
long result)
__attribute__((visibility("default")));

bool debug_dumps_on;

Expand Down Expand Up @@ -655,6 +661,22 @@ intercept_routine(struct context *context)
desc.args[3],
desc.args[4],
desc.args[5]);


/*
* some users might want to execute code after a syscall has
* been forwarded to the kernel (for example, to check its
* return value).
*/
if (intercept_hook_point_post_kernel != NULL)
intercept_hook_point_post_kernel(desc.nr,
desc.args[0],
desc.args[1],
desc.args[2],
desc.args[3],
desc.args[4],
desc.args[5],
result);
}

intercept_log_syscall(patch, &desc, KNOWN, result);
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