From 14af20fcb1833dd776822361891963c90f7b0262 Mon Sep 17 00:00:00 2001 From: =?utf8?q?Ernesto=20A=2E=20Fern=C3=A1ndez?= Date: Sun, 23 Jul 2017 22:32:54 -0300 Subject: [PATCH] f2fs: preserve i_mode if __f2fs_set_acl() fails MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit When changing a file's acl mask, __f2fs_set_acl() will first set the group bits of i_mode to the value of the mask, and only then set the actual extended attribute representing the new acl. If the second part fails (due to lack of space, for example) and the file had no acl attribute to begin with, the system will from now on assume that the mask permission bits are actual group permission bits, potentially granting access to the wrong users. Prevent this by only changing the inode mode after the acl has been set. Signed-off-by: Ernesto A. Fernández Reviewed-by: Chao Yu Signed-off-by: Jaegeuk Kim --- fs/f2fs/acl.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/fs/f2fs/acl.c b/fs/f2fs/acl.c index b4b8438c42ef..436b3a1464d9 100644 --- a/fs/f2fs/acl.c +++ b/fs/f2fs/acl.c @@ -207,15 +207,16 @@ static int __f2fs_set_acl(struct inode *inode, int type, void *value = NULL; size_t size = 0; int error; + umode_t mode = inode->i_mode; switch (type) { case ACL_TYPE_ACCESS: name_index = F2FS_XATTR_INDEX_POSIX_ACL_ACCESS; if (acl && !ipage) { - error = posix_acl_update_mode(inode, &inode->i_mode, &acl); + error = posix_acl_update_mode(inode, &mode, &acl); if (error) return error; - set_acl_inode(inode, inode->i_mode); + set_acl_inode(inode, mode); } break; -- 2.20.1