linux-kernel - Re: [PATCH 1/3] x86: mm: disable KMSAN instrumentation for physaddr.c

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Message-ID: <pi2i2qtsrip43yjji3ao26oqazplbkelma7hv24onxymkisqzm@ee6zflgdgmrc>
Date: Fri, 21 Jun 2024 17:57:40 +0300
From: "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>
To: Alexander Potapenko <glider@...gle.com>
Cc: elver@...gle.com, dvyukov@...gle.com, dave.hansen@...ux.intel.com, 
	peterz@...radead.org, akpm@...ux-foundation.org, x86@...nel.org, 
	linux-kernel@...r.kernel.org, kasan-dev@...glegroups.com
Subject: Re: [PATCH 1/3] x86: mm: disable KMSAN instrumentation for physaddr.c

On Fri, Jun 21, 2024 at 11:48:59AM +0200, Alexander Potapenko wrote:
> Enabling CONFIG_DEBUG_VIRTUAL=y together with KMSAN led to infinite
> recursion, because kmsan_get_metadata() ended up calling instrumented
> __pfn_valid() from arch/x86/mm/physaddr.c.
> 
> Prevent it by disabling instrumentation of the whole file.
> 
> Reported-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
> Closes: https://github.com/google/kmsan/issues/95
> Signed-off-by: Alexander Potapenko <glider@...gle.com>

Reviewed-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>

-- 
  Kiryl Shutsemau / Kirill A. Shutemov