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add safe_read before pointer dereference in drsyscall_linux.c #1

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Merged
Egor-OSSRevival merged 1 commit into from
Apr 1, 2025
Merged

add safe_read before pointer dereference in drsyscall_linux.c #1

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8 changes: 6 additions & 2 deletions drsyscall/drsyscall_linux.c
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Original file line number Diff line number Diff line change
Expand Up @@ -978,8 +978,12 @@ handle_semctl(void *drcontext, cls_syscall_t *pt, sysarg_iter_info_t *ii,
ASSERT(argnum_semid + 3 < SYSCALL_NUM_ARG_STORE, "index too high");
cmd = (uint) pt->sysarg[argnum_semid + 2];
arg_val = (ptr_int_t) pt->sysarg[argnum_semid + 3];
/* XXX i#2547: Use safe_read to de-reference below. */
arg_ptr = (union semun *)arg_val;
union semun temp_arg;
if (!d_r_safe_read((void *)arg_val, sizeof(temp_arg), &temp_arg)) {
ELOGF(0, f_global, "ERROR: Failed to safe_read arg_val at %p\n", (void *)arg_val);
return;
}
arg_ptr = &temp_arg;
semid = (int) pt->sysarg[argnum_semid];
if (!ii->arg->pre && (ptr_int_t)dr_syscall_get_result(drcontext) < 0)
return;
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