linux-kernel - Re: [PATCH] selinux: initialize proto variable in selinux_ip_postroute

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Date:   Mon, 27 Dec 2021 10:48:30 -0500
From:   Paul Moore <paul@...l-moore.com>
To:     trix@...hat.com
Cc:     stephen.smalley.work@...il.com, eparis@...isplace.org,
        nathan@...nel.org, ndesaulniers@...gle.com,
        selinux@...r.kernel.org, linux-kernel@...r.kernel.org,
        llvm@...ts.linux.dev
Subject: Re: [PATCH] selinux: initialize proto variable in selinux_ip_postroute_compat()

On Fri, Dec 24, 2021 at 10:07 AM <trix@...hat.com> wrote:
>
> From: Tom Rix <trix@...hat.com>
>
> Clang static analysis reports this warning
>
> hooks.c:5765:6: warning: 4th function call argument is an uninitialized value
>         if (selinux_xfrm_postroute_last(sksec->sid, skb, &ad, proto))
>             ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>
> selinux_parse_skb() can return ok without setting proto.  The later call
> to selinux_xfrm_postroute_last() does an early check of proto and can
> return ok is the garbage proto value matches.  So initialize proto.
>
> Fixes: eef9b41622f2 ("selinux: cleanup selinux_xfrm_sock_rcv_skb() and selinux_xfrm_postroute_last()")
> Signed-off-by: Tom Rix <trix@...hat.com>
> ---
>  security/selinux/hooks.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)

Thanks Tom.  I don't think this is something that could be easily
triggered on a normal system, even if the compatibility mode was
enabled, but this is something that we should fix regardless.  I've
merged this into selinux/stable-5.16 and will send this up to Linus as
soon as it clears the normal automated testing.

-- 
paul moore
www.paul-moore.com