linux-kernel - Re: [kernel-hardening] [PATCH v2 26/30] fork: Provide usercopy whitelisting for task

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Message-ID: <1504119302.26846.77.camel@redhat.com>
Date:   Wed, 30 Aug 2017 14:55:02 -0400
From:   Rik van Riel <riel@...hat.com>
To:     Kees Cook <keescook@...omium.org>, linux-kernel@...r.kernel.org
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Nicholas Piggin <npiggin@...il.com>,
        Laura Abbott <labbott@...hat.com>,
        Mickaël Salaün <mic@...ikod.net>,
        Ingo Molnar <mingo@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Andy Lutomirski <luto@...nel.org>, linux-mm@...ck.org,
        kernel-hardening@...ts.openwall.com,
        David Windsor <dave@...lcore.net>
Subject: Re: [kernel-hardening] [PATCH v2 26/30] fork: Provide usercopy
 whitelisting for task_struct

On Mon, 2017-08-28 at 14:35 -0700, Kees Cook wrote:
> While the blocked and saved_sigmask fields of task_struct are copied
> to
> userspace (via sigmask_to_save() and setup_rt_frame()), it is always
> copied with a static length (i.e. sizeof(sigset_t)).
> 
> The only portion of task_struct that is potentially dynamically sized
> and
> may be copied to userspace is in the architecture-specific
> thread_struct
> at the end of task_struct.
> 
Acked-by: Rik van Riel <riel@...hat.com>

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