From cb1cf8a31f5e624f30970f8f7cd109356fa79735 Mon Sep 17 00:00:00 2001
From: Matheus <matheusuky@gmail.com>
Date: Sat, 24 Aug 2024 23:16:55 -0300
Subject: [PATCH] utime: proper auth checks

---
 kernel-src/sys/syscalls/utime.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/kernel-src/sys/syscalls/utime.c b/kernel-src/sys/syscalls/utime.c
index 2e32d1a7..abeaf05f 100644
--- a/kernel-src/sys/syscalls/utime.c
+++ b/kernel-src/sys/syscalls/utime.c
@@ -1,6 +1,7 @@
 #include <kernel/syscalls.h>
 #include <kernel/alloc.h>
 #include <kernel/timekeeper.h>
+#include <kernel/auth.h>
 
 syscallret_t syscall_utimensat(context_t *, int fd, char *upath, timespec_t uts[2], int flags) {
 	syscallret_t ret = {
@@ -67,6 +68,15 @@ syscallret_t syscall_utimensat(context_t *, int fd, char *upath, timespec_t uts[
 	attr.atime = ts[0];
 	attr.mtime = ts[1];
 
+	ret.errno = auth_filesystem_check(&_cpu()->thread->proc->cred, AUTH_ACTIONS_FILESYSTEM_SETATTR, node);
+	if (ret.errno) {
+		if (uts == NULL)
+			ret.errno = VOP_ACCESS(node, V_ACCESS_WRITE, &_cpu()->thread->proc->cred);
+
+		if (ret.errno)
+			goto cleanup;
+	}
+
 	ret.errno = VOP_SETATTR(node, &attr, V_ATTR_ATIME | V_ATTR_MTIME, &_cpu()->thread->proc->cred);
 	ret.ret = ret.errno ? -1 : 0;