vfs: fix permission checking in sys_utimensat

If utimensat() is called with both times set to UTIME_NOW or one of them to
UTIME_NOW and the other to UTIME_OMIT, then it will update the file time
without any permission checking.

I don't think this can be used for anything other than a local DoS, but could
be quite bewildering at that (e.g.  "Why was that large source tree rebuilt
when I didn't modify anything???")

This affects all kernels from 2.6.22, when the utimensat() syscall was
introduced.

Fix by doing the same permission checking as for the "times == NULL" case.

Thanks to Michael Kerrisk, whose utimensat-non-conformances-and-fixes.patch in
-mm also fixes this (and breaks other stuff), only he didn't realize the
security implications of this bug.

Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
Cc: Ulrich Drepper <drepper@redhat.com>
Cc: Michael Kerrisk <mtk-manpages@gmx.net>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 15 insertions, 2 deletions

diff --git a/fs/utimes.c b/fs/utimes.c
index a2bef77dc9c9..af059d5cb485 100644
--- a/fs/utimes.c
+++ b/fs/utimes.c
@@ -40,9 +40,14 @@ asmlinkage long sys_utime(char __user *filename, struct utimbuf __user *times)
 
 #endif
 
+static bool nsec_special(long nsec)
+{
+        return nsec == UTIME_OMIT || nsec == UTIME_NOW;
+}
+
 static bool nsec_valid(long nsec)
 {
-        if (nsec == UTIME_OMIT || nsec == UTIME_NOW)
+        if (nsec_special(nsec))
                 return true;
 
         return nsec >= 0 && nsec <= 999999999;
@@ -119,7 +124,15 @@ long do_utimes(int dfd, char __user *filename, struct timespec *times, int flags
                         newattrs.ia_mtime.tv_nsec = times[1].tv_nsec;
                         newattrs.ia_valid |= ATTR_MTIME_SET;
                 }
-        } else {
+        }
+
+        /*
+         * If times is NULL or both times are either UTIME_OMIT or
+         * UTIME_NOW, then need to check permissions, because
+         * inode_change_ok() won't do it.
+         */
+        if (!times || (nsec_special(times[0].tv_nsec) &&
+                       nsec_special(times[1].tv_nsec))) {
                 error = -EACCES;
                 if (IS_IMMUTABLE(inode))
                         goto mnt_drop_write_and_out;