linux-kernel - Re: [PATCH] md: fix potential OOB in multipath_remove

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Message-ID: <CAPhsuW54pW7As-A1G4H+OWALUh7_a5+-zkLXghTh6_JjcWZoMQ@mail.gmail.com>
Date:   Sat, 29 Jul 2023 18:46:01 +0800
From:   Song Liu <song@...nel.org>
To:     Zhang Shurong <zhang_shurong@...mail.com>
Cc:     Christoph Hellwig <hch@...radead.org>, linux-raid@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] md: fix potential OOB in multipath_remove_disk()

On Sat, Jul 15, 2023 at 5:45 PM Zhang Shurong <zhang_shurong@...mail.com> wrote:
>
> 在 2023年7月13日星期四 CST 上午12:50:19，Christoph Hellwig 写道：
> > On Thu, Jul 13, 2023 at 12:46:05AM +0800, Zhang Shurong wrote:
> > > If rddev->raid_disk is greater than mddev->raid_disks, there will be
> > > an out-of-bounds in multipath_remove_disk. We have already found
> > > similar reports as follows:
> > >
> > > 1) commit d17f744e883b ("md-raid10: fix KASAN warning")
> > > 2) commit 1ebc2cec0b7d ("dm raid: fix KASAN warning in raid5_remove_disk")
> > >
> > > Fix this bug by checking whether the "number" variable is
> > > valid.
> >
> > I think it might just be time to finally dropped the deprecated md
> > multipath code instead..
> Should I write another patch to delete them?

Yes, please write a patch to delete the multipath code.

Thanks,
Song