linux-kernel - Re: [PATCH v1] audit: fix illegal pointer dereference for openat2

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Date:   Wed, 9 Feb 2022 18:44:01 -0500
From:   Paul Moore <paul@...l-moore.com>
To:     Richard Guy Briggs <rgb@...hat.com>
Cc:     Linux-Audit Mailing List <linux-audit@...hat.com>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-fsdevel@...r.kernel.org, Eric Paris <eparis@...isplace.org>,
        Steve Grubb <sgrubb@...hat.com>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Aleksa Sarai <cyphar@...har.com>,
        Arnd Bergmann <arnd@...nel.org>, stable@...r.kernel.org,
        Jeff Mahoney <jeffm@...e.com>
Subject: Re: [PATCH v1] audit: fix illegal pointer dereference for openat2

On Wed, Feb 9, 2022 at 4:51 PM Richard Guy Briggs <rgb@...hat.com> wrote:
>
> The user pointer was being illegally dereferenced directly to get the
> open_how flags data in audit_match_perm.  Use the previously saved flags
> data elsewhere in the context instead.
>
> Coverage is provided by the audit-testsuite syscalls_file test case.
>
> Cc: stable@...r.kernel.org
> Link: https://lore.kernel.org/r/c96031b4-b76d-d82c-e232-1cccbbf71946@suse.com
> Fixes: 1c30e3af8a79 ("audit: add support for the openat2 syscall")
> Reported-by: Jeff Mahoney <jeffm@...e.com>
> Signed-off-by: Richard Guy Briggs <rgb@...hat.com>
> ---
>  kernel/auditsc.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)

Thanks Richard.  As this came in ~40m after the other patch, and both
are identical code changes, I've merged the other patch but I did add
a note that you also submitted a similar patch.  Once the automated
testing completes I'll send this up to Linus.

-- 
paul-moore.com