linux-kernel - Re: [PATCH 7/15] sanitize AUDIT_MQ

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Message-Id: <20081216235656.d7985f1d.akpm@linux-foundation.org>
Date:	Tue, 16 Dec 2008 23:56:56 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Al Viro <viro@....linux.org.uk>
Cc:	linux-audit@...hat.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 7/15] sanitize AUDIT_MQ_SENDRECV

On Wed, 17 Dec 2008 05:12:10 +0000 Al Viro <viro@....linux.org.uk> wrote:

> 
> * logging the original value of *msg_prio in mq_timedreceive(2)
>   is insane - the argument is write-only (i.e. syscall always
>   ignores the original value and only overwrites it).
> * merge __audit_mq_timed{send,receive}
> * don't do copy_from_user() twice
> * don't mess with allocations in auditsc part
> * ... and don't bother checking !audit_enabled and !context in there -
>   we'd already checked for audit_dummy_context().
> 
> ...
>
> +		if (copy_from_user(&ts, u_abs_timeout, 
> +					sizeof(struct timespec)))

Well that's odd.  afacit timespec has different sizes on 32-bit and
64-bit userspace.

But the old audit code did this copy too, and it presumably worked.
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