Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933694Ab3EGN5E (ORCPT ); Tue, 7 May 2013 09:57:04 -0400 Received: from mail-ee0-f44.google.com ([74.125.83.44]:37613 "EHLO mail-ee0-f44.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933578Ab3EGN47 (ORCPT ); Tue, 7 May 2013 09:56:59 -0400 Date: Tue, 7 May 2013 15:56:54 +0200 From: Miklos Szeredi To: raven@themaw.net Cc: autofs@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, sukadev@linux.vnet.ibm.com, serge.hallyn@canonical.com, ebiederm@xmission.com Subject: [PATCH 2/2] autofs4: translate pids to the right namespace for the daemon Message-ID: <20130507135654.GB6129@tucsk.piliscsaba.szeredi.hu> References: <20130507135446.GA6129@tucsk.piliscsaba.szeredi.hu> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20130507135446.GA6129@tucsk.piliscsaba.szeredi.hu> User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2157 Lines: 64 From: Miklos Szeredi The PID and the TGID of the process tringgering the mount are sent to the daemon. Currently the global pid values are sent (ones valid in the initial pid namespace) but this is wrong if the autofs daemon itself is not running in the initial pid namespace. So send the pid values that are valid in the namespace of the autofs daemon. The namespace to use is taken from the oz_pgrp pid pointer, which was set at mount time to the mounting process' pid namespace. If the pid translation fails (the triggering process is in an unrelated pid namespace) then the automount fails with ENOENT. Cc: Serge E. Hallyn Cc: Eric Biederman Signed-off-by: Miklos Szeredi --- fs/autofs4/waitq.c | 16 ++++++++++++++-- 1 file changed, 14 insertions(+), 2 deletions(-) --- a/fs/autofs4/waitq.c +++ b/fs/autofs4/waitq.c @@ -353,11 +353,23 @@ int autofs4_wait(struct autofs_sb_info * struct qstr qstr; char *name; int status, ret, type; + pid_t pid; + pid_t tgid; /* In catatonic mode, we don't wait for nobody */ if (sbi->catatonic) return -ENOENT; + /* + * Try translating pids to the namespace of the daemon. + * + * Zero means failure: we are in an unrelated pid namespace. + */ + pid = task_pid_nr_ns(current, ns_of_pid(sbi->oz_pgrp)); + tgid = task_tgid_nr_ns(current, ns_of_pid(sbi->oz_pgrp)); + if (pid == 0 || tgid == 0) + return -ENOENT; + if (!dentry->d_inode) { /* * A wait for a negative dentry is invalid for certain @@ -423,8 +435,8 @@ int autofs4_wait(struct autofs_sb_info * wq->ino = autofs4_get_ino(sbi); wq->uid = current_uid(); wq->gid = current_gid(); - wq->pid = current->pid; - wq->tgid = current->tgid; + wq->pid = pid; + wq->tgid = tgid; wq->status = -EINTR; /* Status return if interrupted */ wq->wait_ctr = 2; mutex_unlock(&sbi->wq_mutex); -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/