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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: [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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