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

apparmor: fix regression in mount mediation when feature set is pinned

to the 4.14-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...

The filename of the patch is: apparmor-fix-regression-in-mount-mediation-when-feature-set-is-pinned.patch and it can be found in the queue-4.14 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 5b9f57cf47b87f07210875d6a24776b4496b818d Mon Sep 17 00:00:00 2001

From: John Johansen john.johansen@canonical.com Date: Thu, 7 Dec 2017 00:28:27 -0800 Subject: apparmor: fix regression in mount mediation when feature set is pinned MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit

From: John Johansen john.johansen@canonical.com

commit 5b9f57cf47b87f07210875d6a24776b4496b818d upstream.

When the mount code was refactored for Labels it was not correctly updated to check whether policy supported mediation of the mount class. This causes a regression when the kernel feature set is reported as supporting mount and policy is pinned to a feature set that does not support mount mediation.

BugLink: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=882697#41 Fixes: 2ea3ffb7782a ("apparmor: add mount mediation") Reported-by: Fabian Grünbichler f.gruenbichler@proxmox.com Signed-off-by: John Johansen john.johansen@canonical.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org

--- security/apparmor/mount.c | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-)

--- a/security/apparmor/mount.c +++ b/security/apparmor/mount.c @@ -330,6 +330,9 @@ static int match_mnt_path_str(struct aa_ AA_BUG(!mntpath); AA_BUG(!buffer);

+ if (!PROFILE_MEDIATES(profile, AA_CLASS_MOUNT)) + return 0; + error = aa_path_name(mntpath, path_flags(profile, mntpath), buffer, &mntpnt, &info, profile->disconnected); if (error) @@ -381,6 +384,9 @@ static int match_mnt(struct aa_profile * AA_BUG(!profile); AA_BUG(devpath && !devbuffer);

+ if (!PROFILE_MEDIATES(profile, AA_CLASS_MOUNT)) + return 0; + if (devpath) { error = aa_path_name(devpath, path_flags(profile, devpath), devbuffer, &devname, &info, @@ -559,6 +565,9 @@ static int profile_umount(struct aa_prof AA_BUG(!profile); AA_BUG(!path);

+ if (!PROFILE_MEDIATES(profile, AA_CLASS_MOUNT)) + return 0; + error = aa_path_name(path, path_flags(profile, path), buffer, &name, &info, profile->disconnected); if (error) @@ -614,7 +623,8 @@ static struct aa_label *build_pivotroot( AA_BUG(!new_path); AA_BUG(!old_path);

- if (profile_unconfined(profile)) + if (profile_unconfined(profile) || + !PROFILE_MEDIATES(profile, AA_CLASS_MOUNT)) return aa_get_newest_label(&profile->label);

error = aa_path_name(old_path, path_flags(profile, old_path),

Patches currently in stable-queue which might be from john.johansen@canonical.com are

queue-4.14/apparmor-fix-regression-in-mount-mediation-when-feature-set-is-pinned.patch