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Date:   Wed, 30 Aug 2017 14:55:02 -0400
From:   Rik van Riel <>
To:     Kees Cook <>,
Cc:     Andrew Morton <>,
        Nicholas Piggin <>,
        Laura Abbott <>,
        Mickaël Salaün <>,
        Ingo Molnar <>,
        Thomas Gleixner <>,
        Andy Lutomirski <>,,,
        David Windsor <>
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 <>

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