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

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Message-ID: <20151208032405.GA47397@ast-mbp.thefacebook.com>
Date:	Mon, 7 Dec 2015 19:24:06 -0800
From:	Alexei Starovoitov <alexei.starovoitov@...il.com>
To:	Dmitry Vyukov <dvyukov@...gle.com>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	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 Mon, Dec 07, 2015 at 05:09:21PM +0100, Dmitry Vyukov wrote:
> > So it would be _awesome_ if we could somehow extend this callchain to
> > include the site that calls call_rcu().
> 
> We have a patch for KASAN in works that adds so-called stack depot
> which allows to map a stack trace onto uint32 id. Then we can plumb

I was hacking something similar to categorize stack traces with u32 id.
How are you planning to limit the number of such stack traces ?
and what is the interface for user space to get stack trace from an id?

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