Jan Kara 073931017b posix_acl: Clear SGID bit when setting file permissions
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>
2016-09-22 10:55:32 +02:00
..
2016-07-20 23:30:06 -04:00
2016-05-12 15:52:50 -07:00
2016-01-22 18:04:28 -05:00
2011-07-25 14:58:15 -07:00
2016-07-26 16:19:19 -07:00
2016-01-22 18:04:28 -05:00
2016-07-26 16:19:19 -07:00
2015-12-29 17:45:49 -08:00
2016-01-22 18:04:28 -05:00
2016-05-12 15:52:50 -07:00
2016-06-19 18:09:31 +02:00
2011-03-31 11:26:23 -03:00
2012-05-29 23:28:40 -04:00
2016-05-12 15:52:50 -07:00