linux-kernel - [PATCH 71/93] NFS: Fix error reporting in nfs_xdev

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Tue,  5 Feb 2013 20:07:00 -0200
From:	Herton Ronaldo Krzesinski <herton.krzesinski@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Trond Myklebust <Trond.Myklebust@...app.com>,
	Herton Ronaldo Krzesinski <herton.krzesinski@...onical.com>
Subject: [PATCH 71/93] NFS: Fix error reporting in nfs_xdev_mount

3.5.7.5 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: Trond Myklebust <Trond.Myklebust@...app.com>

commit dee972b967ae111ad5705733de17a3bfc4632311 upstream.

Currently, nfs_xdev_mount converts all errors from clone_server() to
ENOMEM, which can then leak to userspace (for instance to 'mount'). Fix that.
Also ensure that if nfs_fs_mount_common() returns an error, we
don't dprintk(0)...

The regression originated in commit 3d176e3fe4f6dc379b252bf43e2e146a8f7caf01
(NFS: Use nfs_fs_mount_common() for xdev mounts)

Signed-off-by: Trond Myklebust <Trond.Myklebust@...app.com>
[ herton: backport for 3.5:
  * don't change dprintk to print nfs_xdev_mount as we are still in
    nfs_xdev_mount_common
  * differing clone_server/nfs_fs_mount_common (function call and
    arguments), keep the same calls as in 3.5 ]
Signed-off-by: Herton Ronaldo Krzesinski <herton.krzesinski@...onical.com>
---
 fs/nfs/super.c |   19 +++++++------------
 1 file changed, 7 insertions(+), 12 deletions(-)

diff --git a/fs/nfs/super.c b/fs/nfs/super.c
index 2292f7e..f3cc9b6 100644
--- a/fs/nfs/super.c
+++ b/fs/nfs/super.c
@@ -2541,7 +2541,6 @@ nfs_xdev_mount_common(struct file_system_type *fs_type, int flags,
 	struct nfs_clone_mount *data = mount_info->cloned;
 	struct nfs_server *server;
 	struct dentry *mntroot = ERR_PTR(-ENOMEM);
-	int error;
 
 	dprintk("--> nfs_xdev_mount_common()\n");
 
@@ -2549,19 +2548,15 @@ nfs_xdev_mount_common(struct file_system_type *fs_type, int flags,
 
 	/* create a new volume representation */
 	server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr, data->authflavor);
-	if (IS_ERR(server)) {
-		error = PTR_ERR(server);
-		goto out_err;
-	}
+	if (IS_ERR(server))
+		mntroot = ERR_CAST(server);
+	else
+		mntroot = nfs_fs_mount_common(fs_type, server, flags,
+				dev_name, mount_info);
 
-	mntroot = nfs_fs_mount_common(fs_type, server, flags, dev_name, mount_info);
-	dprintk("<-- nfs_xdev_mount_common() = 0\n");
-out:
+	dprintk("<-- nfs_xdev_mount_common() = %ld\n",
+			IS_ERR(mntroot) ? PTR_ERR(mntroot) : 0L);
 	return mntroot;
-
-out_err:
-	dprintk("<-- nfs_xdev_mount_common() = %d [error]\n", error);
-	goto out;
 }
 
 /*
-- 
1.7.9.5

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/