linux-kernel - Re: uprobes/perf: KASAN: use-after-free in uprobe_perf

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Date:   Thu, 22 Feb 2018 18:09:47 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Oleg Nesterov <oleg@...hat.com>
Cc:     Prashant Bhole <bhole_prashant_q7@....ntt.co.jp>,
        Ingo Molnar <mingo@...hat.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        linux-kernel@...r.kernel.org
Subject: Re: uprobes/perf: KASAN: use-after-free in uprobe_perf_close

On Thu, Feb 22, 2018 at 06:04:27PM +0100, Peter Zijlstra wrote:
> On Thu, Feb 22, 2018 at 05:37:15PM +0100, Oleg Nesterov wrote:

> > This all makes me think that we should change (fix) kernel/events/core.c...
> 
> That's going to be mighty dodgy though, holding a reference on the task
> will avoid the task from dying which will avoid the events from being
> destroyed which will avoid the task from dying which will... if you get
> my drift :-)

Hmm, it might not be all that bad.. I need to re-read some of that code.