linux-kernel - Re: [PATCH v2 0/4] mm: kmemleak: store objects allocated with physical address separately and check when scan

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Message-ID: <CAGcnep-57CcH+7-zaPu16v7AeVgRD=MTvPG8DJR+ucfg6RYREQ@mail.gmail.com>
Date:   Thu, 9 Jun 2022 07:44:11 +0800
From:   patrick wang <patrick.wang.shcn@...il.com>
To:     Kuan-Ying Lee <Kuan-Ying.Lee@...iatek.com>
Cc:     "catalin.marinas@....com" <catalin.marinas@....com>,
        "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Yee Lee (李建誼) <Yee.Lee@...iatek.com>
Subject: Re: [PATCH v2 0/4] mm: kmemleak: store objects allocated with
 physical address separately and check when scan

On Wed, Jun 8, 2022 at 10:46 AM Kuan-Ying Lee
<Kuan-Ying.Lee@...iatek.com> wrote:
>
> On Fri, 2022-06-03 at 11:54 +0800, Patrick Wang wrote:
> > The kmemleak_*_phys() interface uses "min_low_pfn" and
> > "max_low_pfn" to check address. But on some architectures,
> > kmemleak_*_phys() is called before those two variables
> > initialized. The following steps will be taken:
> >
> > 1) Add OBJECT_PHYS flag and rbtree for the objects allocated
> >    with physical address
> > 2) Store physical address in objects if allocated with OBJECT_PHYS
> > 3) Check the boundary when scan instead of in kmemleak_*_phys()
> >
> > This patch set will solve:
> > https://lore.kernel.org/r/20220527032504.30341-1-yee.lee@mediatek.com
> >
> https://lore.kernel.org/r/9dd08bb5-f39e-53d8-f88d-bec598a08c93@gmail.com
>
> Hi Patrick,
>
> If this patchset fix the above issue, I think we need to add
> the below fixes tag.
>
> Fixes: 23c2d497de21 ("mm: kmemleak: take a full lowmem check in
> kmemleak_*_phys()")

Hi Kuan-Ying,

Thanks for taking a look.

This series should solve the false positive on ppc32 and arm64.
And the false positive on arm64 is triggered by commit
23c2d497de21. So I will add the fixes tag.

Thanks,
Patrick