Patch "libfs: Modify mount_pseudo_xattr to be clear it is not a userspace mount" has been added to the 4.9-stable tree

Patch "libfs: Modify mount_pseudo_xattr to be clear it is not a userspace mount" has been added to the 4.9-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    libfs: Modify mount_pseudo_xattr to be clear it is not a userspace mount

to the 4.9-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     libfs-modify-mount_pseudo_xattr-to-be-clear-it-is-not-a-userspace-mount.patch
and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From foo@baz Wed Dec  6 17:39:55 CET 2017
From: "Eric W. Biederman" <ebiederm@xmission.com>
Date: Wed, 4 Jan 2017 17:37:27 +1300
Subject: libfs: Modify mount_pseudo_xattr to be clear it is not a userspace mount

From: "Eric W. Biederman" <ebiederm@xmission.com>


[ Upstream commit 75422726b0f717d67db3283c2eb5bc14fa2619c5 ]

Add MS_KERNMOUNT to the flags that are passed.
Use sget_userns and force &init_user_ns instead of calling sget so that
even if called from a weird context the internal filesystem will be
considered to be in the intial user namespace.

Luis Ressel reported that the the failure to pass MS_KERNMOUNT into
mount_pseudo broke his in development graphics driver that uses the
generic drm infrastructure.  I am not certain the deriver was bug
free in it's usage of that infrastructure but since
mount_pseudo_xattr can never be triggered by userspace it is clearer
and less error prone, and less problematic for the code to be explicit.

Reported-by: Luis Ressel <aranea@aixah.de>
Tested-by: Luis Ressel <aranea@aixah.de>
Acked-by: Al Viro <viro@ZenIV.linux.org.uk>
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 fs/libfs.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/fs/libfs.c
+++ b/fs/libfs.c
@@ -245,7 +245,8 @@ struct dentry *mount_pseudo_xattr(struct
 	struct inode *root;
 	struct qstr d_name = QSTR_INIT(name, strlen(name));
 
-	s = sget(fs_type, NULL, set_anon_super, MS_NOUSER, NULL);
+	s = sget_userns(fs_type, NULL, set_anon_super, MS_KERNMOUNT|MS_NOUSER,
+			&init_user_ns, NULL);
 	if (IS_ERR(s))
 		return ERR_CAST(s);
 


Patches currently in stable-queue which might be from ebiederm@xmission.com are

queue-4.9/libfs-modify-mount_pseudo_xattr-to-be-clear-it-is-not-a-userspace-mount.patch