linux-kernel - Re: [PATCH v2] kasan: add test for SLAB_TYPESAFE_BY

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Message-ID: <CA+fCnZcYBCfPA5ObUEWq9iJnXFMw95GKHFZaaZPr84GUtbVNnw@mail.gmail.com>
Date: Fri, 15 Aug 2025 06:42:50 +0200
From: Andrey Konovalov <andreyknvl@...il.com>
To: Jann Horn <jannh@...gle.com>
Cc: Andrey Ryabinin <ryabinin.a.a@...il.com>, Alexander Potapenko <glider@...gle.com>, 
	Dmitry Vyukov <dvyukov@...gle.com>, Vincenzo Frascino <vincenzo.frascino@....com>, 
	Andrew Morton <akpm@...ux-foundation.org>, Vlastimil Babka <vbabka@...e.cz>, kasan-dev@...glegroups.com, 
	linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] kasan: add test for SLAB_TYPESAFE_BY_RCU quarantine skipping

On Thu, Aug 14, 2025 at 5:05 PM Jann Horn <jannh@...gle.com> wrote:
>
> > I think this might fail for the HW_TAGS mode? The location will be
> > reused, but the tag will be different.
>
> No, it's a SLAB_TYPESAFE_BY_RCU cache, so the tag can't really be
> different. poison_slab_object() will bail out, and assign_tag() will
> reuse the already-assigned tag.

Ah, right!