linux-kernel - Re: [PATCH] mm/slub: Add slub_debug option to panic on memory corruption

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Message-ID: <202103181007.BD08B37D00@keescook>
Date:   Thu, 18 Mar 2021 10:08:29 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Vlastimil Babka <vbabka@...e.cz>
Cc:     Georgi Djakov <georgi.djakov@...aro.org>, linux-mm@...ck.org,
        akpm@...ux-foundation.org, cl@...ux.com, penberg@...nel.org,
        rientjes@...gle.com, iamjoonsoo.kim@....com, corbet@....net,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm/slub: Add slub_debug option to panic on memory
 corruption

On Thu, Mar 18, 2021 at 01:56:05PM +0100, Vlastimil Babka wrote:
> I was going to suggest adding a panic_on_taint parameter... but turns out it was
> already added last year! And various memory corruption detections already use
> TAINT_BAD_PAGE, including SLUB.
> If anything's missing an add_taint() it can be added, and with the parameter you
> should get what you want.

Ah-ha! That works too. I hadn't seen that -- I wonder if I can wire some
other hardening things up to that. (e.g. refactor BUG_ON_CORRUPTION
finally.)

-- 
Kees Cook