linux-kernel - Re: use-after-free in __perf_install_in

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Message-ID: <CACT4Y+YJ5H+xXO9A+FSFQ0uP_rEyWRVY36oEWTPp68+fF1nnsg@mail.gmail.com>
Date:	Tue, 8 Dec 2015 17:50:44 +0100
From:	Dmitry Vyukov <dvyukov@...gle.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	syzkaller <syzkaller@...glegroups.com>,
	Kostya Serebryany <kcc@...gle.com>,
	Alexander Potapenko <glider@...gle.com>,
	Eric Dumazet <edumazet@...gle.com>,
	Sasha Levin <sasha.levin@...cle.com>
Subject: Re: use-after-free in __perf_install_in_context

On Tue, Dec 8, 2015 at 5:27 PM, Peter Zijlstra <peterz@...radead.org> wrote:
> On Fri, Dec 04, 2015 at 09:04:35PM +0100, Dmitry Vyukov wrote:
>
>> I was able to reproduce it by
>> restricting syscalls only to perf_event_open, perf ioctls and bpf
>> syscall.
>
> Does that include cpu hotplug?

I have CONFIG_HOTPLUG_CPU enabled. But I don't do actual plug/unplug.


> Sasha just reminded me there is a swevent use-after-free issue on
> hotplug.
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