linux-kernel - Re: [PATCH 09/13] powerpc: Disable KMSAN checks on functions which walk the stack

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Message-ID: <87wmtfu9dh.fsf@kernel.org>
Date: Fri, 15 Dec 2023 14:32:02 +0530
From: Aneesh Kumar K.V <aneesh.kumar@...nel.org>
To: Nicholas Miehlbradt <nicholas@...ux.ibm.com>, glider@...gle.com,
	elver@...gle.com, dvyukov@...gle.com, akpm@...ux-foundation.org,
	mpe@...erman.id.au, npiggin@...il.com, christophe.leroy@...roup.eu
Cc: linux-mm@...ck.org, kasan-dev@...glegroups.com, iii@...ux.ibm.com,
	linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
	Nicholas Miehlbradt <nicholas@...ux.ibm.com>
Subject: Re: [PATCH 09/13] powerpc: Disable KMSAN checks on functions which
 walk the stack

Nicholas Miehlbradt <nicholas@...ux.ibm.com> writes:

> Functions which walk the stack read parts of the stack which cannot be
> instrumented by KMSAN e.g. the backchain. Disable KMSAN sanitization of
> these functions to prevent false positives.
>

Is the annotation needed to avoid uninitialized access check when
reading parts of the stack? Can you provide a false positive example for
the commit message?

-aneesh