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

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Date: Fri, 23 Feb 2024 21:03:52 +0100
From: Mickaël Salaün <mic@...ikod.net>
To: Casey Schaufler <casey@...aufler-ca.com>, 
	John Johansen <john.johansen@...onical.com>, Paul Moore <paul@...l-moore.com>
Cc: 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
Subject: Re: [PATCH 1/2] SELinux: Fix lsm_get_self_attr()

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.