linux-hardening - Re: [PATCH v13 5/9] drm/i915: Check for integer truncation on scatterlist creation

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Message-ID: <202209281102.A86D736@keescook>
Date:   Wed, 28 Sep 2022 11:06:07 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Gwan-gyeong Mun <gwan-gyeong.mun@...el.com>,
        intel-gfx@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, mchehab@...nel.org,
        chris@...is-wilson.co.uk, matthew.auld@...el.com,
        thomas.hellstrom@...ux.intel.com, jani.nikula@...el.com,
        nirmoy.das@...el.com, airlied@...hat.com, daniel@...ll.ch,
        andi.shyti@...ux.intel.com, andrzej.hajda@...el.com,
        mauro.chehab@...ux.intel.com, linux@...musvillemoes.dk,
        vitor@...saru.org, dlatypov@...gle.com, ndesaulniers@...gle.com,
        trix@...hat.com, llvm@...ts.linux.dev,
        linux-hardening@...r.kernel.org, linux-sparse@...r.kernel.org,
        nathan@...nel.org, gustavoars@...nel.org,
        luc.vanoostenryck@...il.com
Subject: Re: [PATCH v13 5/9] drm/i915: Check for integer truncation on
 scatterlist creation

On Wed, Sep 28, 2022 at 10:09:04AM -0700, Linus Torvalds wrote:
> Kees, you need to reign in the craziness in overflow.h.

Understood. I've been trying to help the drm folks walk a line between
having a bunch of custom macros hidden away in the drm includes and
building up generalized versions that are actually helpful beyond drm.
But I can see that it doesn't help to have a "do two things at the same
time" macro for the assignment checking.

-- 
Kees Cook