Jan Kara dd2421b5ed
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.
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 >
[wt: dropped hfsplus changes : no xattr in 3.10]
Signed-off-by: Willy Tarreau <w@1wt.eu >
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Jan Kara
dd2421b5ed