linux-kernel - Re: [syzbot] KASAN: use-after-free Read in put_pmu

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Message-ID: <CAKH8qBs1UiikX=_CBzRC_2rg3sp8CU5hhB7sOkNkNBqm8OqFEw@mail.gmail.com>
Date:   Tue, 20 Dec 2022 09:10:30 -0800
From:   Stanislav Fomichev <sdf@...gle.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     syzbot <syzbot+b8e8c01c8ade4fe6e48f@...kaller.appspotmail.com>,
        acme@...nel.org, alexander.shishkin@...ux.intel.com,
        bpf@...r.kernel.org, jolsa@...nel.org,
        linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
        mark.rutland@....com, mingo@...hat.com, namhyung@...nel.org,
        netdev@...r.kernel.org, syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] KASAN: use-after-free Read in put_pmu_ctx

On Tue, Dec 20, 2022 at 12:22 AM Peter Zijlstra <peterz@...radead.org> wrote:
>
> On Mon, Dec 19, 2022 at 11:33:29AM -0800, sdf@...gle.com wrote:
> > On 12/19, Peter Zijlstra wrote:
> > > On Mon, Dec 19, 2022 at 12:04:43AM -0800, syzbot wrote:
>
> > > > HEAD commit:    13e3c7793e2f Merge tag 'for-netdev' of
> > > https://git.kernel...
> > > > git tree:       bpf
> > > > console+strace: https://syzkaller.appspot.com/x/log.txt?x=177df7e0480000
> > > > kernel config:
> > > https://syzkaller.appspot.com/x/.config?x=b0e91ad4b5f69c47
> > > > dashboard link:
> > > https://syzkaller.appspot.com/bug?extid=b8e8c01c8ade4fe6e48f
>
> ^ so syzbot knows what tree and config were used to trigger the report,
> then why:

I haven't used it before and wasn't sure whether it would take the
last commit from the branch of the one where it failed. Adding them
shouldn't hurt, right?

> > Let's maybe try it this way:
> >
> > #syz test: https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git
> > 13e3c7793e2f
>
> do you have to repeat that again in order for it to test something?

Yeah, I was trying to understand why it doesn't like my patch. It
seems I can retry with the patch attached which hopefully should fix
the possible formatting issue; let's see.

#syz test: https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git
13e3c7793e2f

View attachment "pmu.patch" of type "text/x-patch" (433 bytes)