linux-kernel - Re: [PATCH 1/2] SELinux: Fix lsm_get_self

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: Fri, 23 Feb 2024 16:05:16 -0500
From: Paul Moore <paul@...l-moore.com>
To: Mickaël Salaün <mic@...ikod.net>
Cc: Casey Schaufler <casey@...aufler-ca.com>, John Johansen <john.johansen@...onical.com>, 
	James Morris <jmorris@...ei.org>, "Serge E . Hallyn" <serge@...lyn.com>, linux-kernel@...r.kernel.org, 
	linux-security-module@...r.kernel.org, stable@...r.kernel.org, 
	selinux@...r.kernel.org
Subject: Re: [PATCH 1/2] SELinux: Fix lsm_get_self_attr()

On Fri, Feb 23, 2024 at 3:04 PM Mickaël Salaün <mic@...ikod.net> wrote:
>
> On Fri, Feb 23, 2024 at 08:59:34PM +0100, Mickaël Salaün wrote:
> > On Fri, Feb 23, 2024 at 08:05:45PM +0100, Mickaël Salaün wrote:
> > > selinux_lsm_getattr() may not initialize the value's pointer in some
> > > case.  As for proc_pid_attr_read(), initialize this pointer to NULL in
> > > selinux_getselfattr() to avoid an UAF in the kfree() call.
> >
> > Not UAF but NULL pointer dereference (both patches)...
>
> Well, that may be the result (as observed with the kfree() call), but
> the cause is obviously an uninitialized pointer.

Adding the SELinux list to the CC line; SELinux folks the original post is here:

* https://lore.kernel.org/all/20240223190546.3329966-1-mic@digikod.net

Thanks for finding this and testing the patch, based on our off-list
discussion, do you mind if I add a Suggested-by?  Looking at this a
bit more I think we'll want to make a few changes to
selinux_lsm_getattr() later, but this patch is a good one for stable
as it not only fixes the bug, but it is a trivial one-liner with very
low risk.

I do think we need to tweak the commit description a bit, what do you
think of the following?

  "selinux_getselfattr() doesn't properly initialize the string
   pointer it passes to selinux_lsm_getattr() which can cause a
   problem when an attribute hasn't been explicitly set;
   selinux_lsm_getattr() returns 0/success, but does not set or
   initialize the string label/attribute.  Failure to properly
   initialize the string causes problems later in
   selinux_getselfattr() when the function attempts to kfree()
   the string."

-- 
paul-moore.com