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authorMiklos Szeredi <mszeredi@redhat.com>2016-09-16 12:44:20 +0200
committerMiklos Szeredi <mszeredi@redhat.com>2016-09-16 12:44:20 +0200
commitf2b20f6ee842313a0d681dbbf7f87b70291a6a3b (patch)
treeb4bea4c83e1968a4f69592e9a7fc15be81750a8c /fs/utimes.c
parente71b9dff0634edb127f449e076e883ef24a8c76c (diff)
downloadlinux-f2b20f6ee842313a0d681dbbf7f87b70291a6a3b.tar.bz2
vfs: move permission checking into notify_change() for utimes(NULL)
This fixes a bug where the permission was not properly checked in overlayfs. The testcase is ltp/utimensat01. It is also cleaner and safer to do the permission checking in the vfs helper instead of the caller. This patch introduces an additional ia_valid flag ATTR_TOUCH (since touch(1) is the most obvious user of utimes(NULL)) that is passed into notify_change whenever the conditions for this special permission checking mode are met. Reported-by: Aihua Zhang <zhangaihua1@huawei.com> Signed-off-by: Miklos Szeredi <mszeredi@redhat.com> Tested-by: Aihua Zhang <zhangaihua1@huawei.com> Cc: <stable@vger.kernel.org> # v3.18+
Diffstat (limited to 'fs/utimes.c')
-rw-r--r--fs/utimes.c17
1 files changed, 1 insertions, 16 deletions
diff --git a/fs/utimes.c b/fs/utimes.c
index 794f5f5b1fb5..ba54b9e648c9 100644
--- a/fs/utimes.c
+++ b/fs/utimes.c
@@ -87,21 +87,7 @@ static int utimes_common(struct path *path, struct timespec *times)
*/
newattrs.ia_valid |= ATTR_TIMES_SET;
} else {
- /*
- * If times is NULL (or both times are UTIME_NOW),
- * then we need to check permissions, because
- * inode_change_ok() won't do it.
- */
- error = -EPERM;
- if (IS_IMMUTABLE(inode))
- goto mnt_drop_write_and_out;
-
- error = -EACCES;
- if (!inode_owner_or_capable(inode)) {
- error = inode_permission(inode, MAY_WRITE);
- if (error)
- goto mnt_drop_write_and_out;
- }
+ newattrs.ia_valid |= ATTR_TOUCH;
}
retry_deleg:
inode_lock(inode);
@@ -113,7 +99,6 @@ retry_deleg:
goto retry_deleg;
}
-mnt_drop_write_and_out:
mnt_drop_write(path->mnt);
out:
return error;