kernel: fix issue with dfd parameter retrieval

Although in most cases, this system call might not be used, or when called, AT_FDCWD(-100) is passed in.
tiann · Mar 27, 2024 · ee65e23 · ee65e23
1 parent eea2287
commit ee65e23
Showing 1 changed file with 3 additions and 3 deletions.
diff --git a/kernel/sucompat.c b/kernel/sucompat.c
@@ -134,7 +134,7 @@ int ksu_handle_execveat_sucompat(int *fd, struct filename **filename_ptr,
 
 __maybe_unused static int faccessat_handler_pre(struct kprobe *p, struct pt_regs *regs)
 {
-	int *dfd = (int *)PT_REGS_PARM1(regs);
+	int *dfd = (int *)&PT_REGS_PARM1(regs);
 	const char __user **filename_user = (const char **)&PT_REGS_PARM2(regs);
 	int *mode = (int *)&PT_REGS_PARM3(regs);
 	// Both sys_ and do_ is C function
@@ -150,7 +150,7 @@ static int sys_faccessat_handler_pre(struct kprobe *p, struct pt_regs *regs)
 #else
 	struct pt_regs *real_regs = regs;
 #endif
-	int *dfd = (int *)PT_REGS_PARM1(real_regs);
+	int *dfd = (int *)&PT_REGS_PARM1(real_regs);
 	const char __user **filename_user = (const char **)&PT_REGS_PARM2(real_regs);
 	int *mode = (int *)&PT_REGS_PARM3(real_regs);
 
@@ -261,4 +261,4 @@ void ksu_sucompat_exit() {
 	unregister_kprobe(&newfstatat_kp);
 	unregister_kprobe(&faccessat_kp);
 #endif
-}
+}