From mboxrd@z Thu Jan 1 00:00:00 1970 From: Dave Chinner Subject: Re: [PATCH -V1 09/22] vfs: Make acl_permission_check() work for richacls Date: Tue, 29 Apr 2014 10:20:13 +1000 Message-ID: <20140429002013.GR15995@dastard> References: <1398615293-22931-1-git-send-email-aneesh.kumar@linux.vnet.ibm.com> <1398615293-22931-10-git-send-email-aneesh.kumar@linux.vnet.ibm.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: agruen@kernel.org, bfields@fieldses.org, akpm@linux-foundation.org, viro@zeniv.linux.org.uk, dhowells@redhat.com, linux-fsdevel@vger.kernel.org, linux-nfs@vger.kernel.org, linux-kernel@vger.kernel.org To: "Aneesh Kumar K.V" Return-path: Content-Disposition: inline In-Reply-To: <1398615293-22931-10-git-send-email-aneesh.kumar@linux.vnet.ibm.com> Sender: linux-kernel-owner@vger.kernel.org List-Id: linux-fsdevel.vger.kernel.org On Sun, Apr 27, 2014 at 09:44:40PM +0530, Aneesh Kumar K.V wrote: > From: Andreas Gruenbacher > > Signed-off-by: Andreas Gruenbacher > Signed-off-by: Aneesh Kumar K.V > --- > fs/namei.c | 13 +++++++++++++ > 1 file changed, 13 insertions(+) > > diff --git a/fs/namei.c b/fs/namei.c > index 26b9a8212837..06474553c08d 100644 > --- a/fs/namei.c > +++ b/fs/namei.c > @@ -284,6 +284,19 @@ static int acl_permission_check(struct inode *inode, int mask) > { > unsigned int mode = inode->i_mode; > > + if (IS_RICHACL(inode)) { > + int error = check_acl(inode, mask); > + if (error != -EAGAIN) > + return error; > + if (mask & (MAY_DELETE_SELF | MAY_TAKE_OWNERSHIP | > + MAY_CHMOD | MAY_SET_TIMES)) { > + /* > + * The file permission bit cannot grant these > + * permissions. > + */ > + return -EACCES; > + } > + } > if (likely(uid_eq(current_fsuid(), inode->i_uid))) > mode >>= 6; > else { why does this take priority over a simple uid match? Some comments explaining this for people unfamiliar with richacls would be nice. Not to mention the commit message should also explain the change... Cheers, Dave. -- Dave Chinner david@fromorbit.com