linux-kernel - Re: [PATCH v3 net-next] bpf: fix bpf_perf_event

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Message-ID: <5629ADC8.20009@huawei.com>
Date:	Fri, 23 Oct 2015 11:47:20 +0800
From:	"Wangnan (F)" <wangnan0@...wei.com>
To:	Alexei Starovoitov <ast@...mgrid.com>,
	"David S. Miller" <davem@...emloft.net>
CC:	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	He Kuang <hekuang@...wei.com>, Kaixu Xia <xiakaixu@...wei.com>,
	"Daniel Borkmann" <daniel@...earbox.net>, <netdev@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 net-next] bpf: fix bpf_perf_event_read() helper



On 2015/10/23 8:10, Alexei Starovoitov wrote:
> Fix safety checks for bpf_perf_event_read():
> - only non-inherited events can be added to perf_event_array map
>    (do this check statically at map insertion time)
> - dynamically check that event is local and !pmu->count
> Otherwise buggy bpf program can cause kernel splat.
>
> Also fix error path after perf_event_attrs()
> and remove redundant 'extern'.
>
> Fixes: 35578d798400 ("bpf: Implement function bpf_perf_event_read() that get the selected hardware PMU conuter")
> Signed-off-by: Alexei Starovoitov <ast@...nel.org>

Tested-by: Wang Nan <wangnan0@...wei.com>


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