linux-kernel - Re: [PATCH] powerpc/kasan: Fix early region not updated correctly

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Message-Id: <164490280217.270256.12753879562641501185.b4-ty@ellerman.id.au>
Date:   Tue, 15 Feb 2022 16:26:42 +1100
From:   Michael Ellerman <patch-notifications@...erman.id.au>
To:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Chen Jingwen <chenjingwen6@...wei.com>,
        kasan-dev <kasan-dev@...glegroups.com>,
        linuxppc-dev@...ts.ozlabs.org,
        Michael Ellerman <mpe@...erman.id.au>,
        Paul Mackerras <paulus@...ba.org>,
        linux-kernel@...r.kernel.org,
        Christophe Leroy <christophe.leroy@....fr>
Subject: Re: [PATCH] powerpc/kasan: Fix early region not updated correctly

On Wed, 29 Dec 2021 11:52:26 +0800, Chen Jingwen wrote:
> The shadow's page table is not updated when PTE_RPN_SHIFT is 24
> and PAGE_SHIFT is 12. It not only causes false positives but
> also false negative as shown the following text.
> 
> Fix it by bringing the logic of kasan_early_shadow_page_entry here.
> 
> 1. False Positive:
> ==================================================================
> BUG: KASAN: vmalloc-out-of-bounds in pcpu_alloc+0x508/0xa50
> Write of size 16 at addr f57f3be0 by task swapper/0/1
> 
> [...]

Applied to powerpc/next.

[1/1] powerpc/kasan: Fix early region not updated correctly
      https://git.kernel.org/powerpc/c/dd75080aa8409ce10d50fb58981c6b59bf8707d3

cheers