linux-kernel - Re: [PATCH] seccomp: Check flags on seccomp

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Date:   Fri, 27 Dec 2019 07:38:39 -0700
From:   Tycho Andersen <tycho@...ho.ws>
To:     Sargun Dhillon <sargun@...gun.me>
Cc:     Christian Brauner <christian.brauner@...ntu.com>,
        Aleksa Sarai <cyphar@...har.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Linux API <linux-api@...r.kernel.org>,
        Jann Horn <jannh@...gle.com>, Kees Cook <keescook@...omium.org>
Subject: Re: [PATCH] seccomp: Check flags on seccomp_notif is unset

On Fri, Dec 27, 2019 at 09:22:20AM -0500, Sargun Dhillon wrote:
> Just doing a simple copy_from_user, and for now, calling memchr_inv
> on the whole thing. We can drop the memset, and just leave a note to
> indicate that if unpadded fields are introduced in the future, this structure
> must be manually zeroed out. Although, this might be laying a trap for
> ourselves.

Yes, please keep the memset().

Tycho