diff options
| author | Jan Kara <jack@suse.cz> | 2016-09-19 18:39:09 +0300 |
|---|---|---|
| committer | Ben Hutchings <ben@decadent.org.uk> | 2016-11-20 04:17:38 +0300 |
| commit | f2ba3e2310b3967720b83126db8684c69ce41894 (patch) | |
| tree | 30b237b20b24ab7692e160bfc01d353f2a3e29b7 /fs/reiserfs | |
| parent | 3418703a9d04fa65f993e89a3fa6bfeed3c1fe7c (diff) | |
| download | linux-f2ba3e2310b3967720b83126db8684c69ce41894.tar.xz | |
posix_acl: Clear SGID bit when setting file permissions
commit 073931017b49d9458aa351605b43a7e34598caef upstream.
When file permissions are modified via chmod(2) and the user is not in
the owning group or capable of CAP_FSETID, the setgid bit is cleared in
inode_change_ok(). Setting a POSIX ACL via setxattr(2) sets the file
permissions as well as the new ACL, but doesn't clear the setgid bit in
a similar way; this allows to bypass the check in chmod(2). Fix that.
References: CVE-2016-7097
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
[bwh: Backported to 3.16:
- Drop changes to orangefs
- Adjust context
- Update ext3 as well]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Diffstat (limited to 'fs/reiserfs')
| -rw-r--r-- | fs/reiserfs/xattr_acl.c | 8 |
1 files changed, 2 insertions, 6 deletions
diff --git a/fs/reiserfs/xattr_acl.c b/fs/reiserfs/xattr_acl.c index 44503e293790..7071c2230a92 100644 --- a/fs/reiserfs/xattr_acl.c +++ b/fs/reiserfs/xattr_acl.c @@ -246,13 +246,9 @@ __reiserfs_set_acl(struct reiserfs_transaction_handle *th, struct inode *inode, case ACL_TYPE_ACCESS: name = POSIX_ACL_XATTR_ACCESS; if (acl) { - error = posix_acl_equiv_mode(acl, &inode->i_mode); - if (error < 0) + error = posix_acl_update_mode(inode, &inode->i_mode, &acl); + if (error) return error; - else { - if (error == 0) - acl = NULL; - } } break; case ACL_TYPE_DEFAULT: |