linux-kernel - Re: [PATCH] kasan: Disable Software Tag-Based KASAN with GCC

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Message-Id: <172898869113.658437.16326042568646594201.b4-ty@kernel.org>
Date: Tue, 15 Oct 2024 13:39:08 +0100
From: Will Deacon <will@...nel.org>
To: linux-arm-kernel@...ts.infradead.org,
	Will Deacon <will@...nel.org>
Cc: catalin.marinas@....com,
	kernel-team@...roid.com,
	linux-kernel@...r.kernel.org,
	ryabinin.a.a@...il.com,
	glider@...gle.com,
	kasan-dev@...glegroups.com,
	Andrey Konovalov <andreyknvl@...il.com>,
	Mark Rutland <mark.rutland@....com>,
	syzbot+908886656a02769af987@...kaller.appspotmail.com
Subject: Re: [PATCH] kasan: Disable Software Tag-Based KASAN with GCC

On Mon, 14 Oct 2024 17:11:00 +0100, Will Deacon wrote:
> Syzbot reports a KASAN failure early during boot on arm64 when building
> with GCC 12.2.0 and using the Software Tag-Based KASAN mode:
> 
>   | BUG: KASAN: invalid-access in smp_build_mpidr_hash arch/arm64/kernel/setup.c:133 [inline]
>   | BUG: KASAN: invalid-access in setup_arch+0x984/0xd60 arch/arm64/kernel/setup.c:356
>   | Write of size 4 at addr 03ff800086867e00 by task swapper/0
>   | Pointer tag: [03], memory tag: [fe]
> 
> [...]

Applied to arm64 (for-next/fixes), thanks!

[1/1] kasan: Disable Software Tag-Based KASAN with GCC
      https://git.kernel.org/arm64/c/7aed6a2c51ff

Cheers,
-- 
Will

https://fixes.arm64.dev
https://next.arm64.dev
https://will.arm64.dev