linux-kernel - Re: [PATCH v5 0/3] binder: use cred instead of task for security context

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Message-ID: <CAHC9VhQ6W=8rX6hryk_d+iTc90MAoZOw=KVDhjXsXE5Laccn_A@mail.gmail.com>
Date:   Thu, 14 Oct 2021 17:33:48 -0400
From:   Paul Moore <paul@...l-moore.com>
To:     Todd Kjos <tkjos@...gle.com>
Cc:     gregkh@...uxfoundation.org, arve@...roid.com, tkjos@...roid.com,
        maco@...roid.com, christian@...uner.io,
        James Morris <jmorris@...ei.org>,
        Serge Hallyn <serge@...lyn.com>,
        Stephen Smalley <stephen.smalley.work@...il.com>,
        Eric Paris <eparis@...isplace.org>, keescook@...omium.org,
        jannh@...gle.com, Jeffrey Vander Stoep <jeffv@...gle.com>,
        zohar@...ux.ibm.com, linux-security-module@...r.kernel.org,
        selinux@...r.kernel.org, devel@...verdev.osuosl.org,
        linux-kernel@...r.kernel.org, joel@...lfernandes.org,
        kernel-team@...roid.com
Subject: Re: [PATCH v5 0/3] binder: use cred instead of task for security context

On Tue, Oct 12, 2021 at 12:56 PM Todd Kjos <tkjos@...gle.com> wrote:
>
> This series fixes the possible use of an incorrect security context
> when checking selinux permissions, getting a security ID, or lookup
> up the euid.
>
> The previous behavior was to save the group_leader 'struct task_struct'
> in binder_open() and using that to obtain security IDs or euids.
>
> This has been shown to be unreliable, so this series instead saves the
> 'struct cred' of the task that called binder_open(). This cred is used
> for these lookups instead of the task.

Hi Todd,

I just merged all three patches into selinux/next, thanks for your
help patience on this patchset.  Ultimately I merged these patches
into selinux/next as opposed to selinux/stable-5.15 because I felt
that a couple of weeks in -next before going to Linus would be a good
thing.  I'm also not certain how widespread binder is outside of
Android so I figured the practical difference between next and
stable-5.15 is likely very small.  Regardless, all of your Fixes and
stable tags remain in the patches so as soon as they go up to Linus
during the next merge window the stable folks will be notified.

-- 
paul moore
www.paul-moore.com