Subject: Re: [PATCH v2 45/63] ath11k: Use memset_startat() for clearing queue descriptors

From: Kees Cook <[email-masked]>
Date: Thu, 19 Aug 2021 09:25:01 -0700

On Thu, Aug 19, 2021 at 04:19:37PM +0300, Kalle Valo wrote:
> Kees Cook <[email-masked]> writes:
> 
> > In preparation for FORTIFY_SOURCE performing compile-time and run-time
> > field bounds checking for memset(), avoid intentionally writing across
> > neighboring fields.
> >
> > Use memset_startat() so memset() doesn't get confused about writing
> > beyond the destination member that is intended to be the starting point
> > of zeroing through the end of the struct. Additionally split up a later
> > field-spanning memset() so that memset() can reason about the size.
> >
> > Cc: Kalle Valo <[email-masked]>
> > Cc: "David S. Miller" <[email-masked]>
> > Cc: Jakub Kicinski <[email-masked]>
> > Cc: [email-masked]
> > Cc: [email-masked]
> > Cc: [email-masked]
> > Signed-off-by: Kees Cook <[email-masked]>
> 
> To avoid conflicts I prefer taking this via my ath tree.

The memset helpers are introduced as part of this series, so that makes
things more difficult. Do you want me to create a branch with the
helpers that you can merge?

-Kees

-- 
Kees Cook