From: Arnaldo Carvalho de Melo <acme@kernel.org>
To: "Wangnan (F)" <wangnan0@huawei.com>
Cc: He Kuang <hekuang@huawei.com>,
peterz@infradead.org, mingo@redhat.com,
alexander.shishkin@linux.intel.com, jolsa@redhat.com,
jpoimboe@redhat.com, ak@linux.intel.com, eranian@google.com,
namhyung@kernel.org, adrian.hunter@intel.com,
sukadev@linux.vnet.ibm.com, masami.hiramatsu.pt@hitachi.com,
tumanova@linux.vnet.ibm.com, kan.liang@intel.com,
penberg@kernel.org, dsahern@gmail.com,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 5/5] perf tools: Fix NULL pointer deference when vdso not found
Date: Thu, 23 Jun 2016 09:07:04 -0300 [thread overview]
Message-ID: <20160623120704.GL4213@kernel.org> (raw)
In-Reply-To: <576B433F.4080202@huawei.com>
Em Thu, Jun 23, 2016 at 10:02:39AM +0800, Wangnan (F) escreveu:
> Hi,
>
> This patch fixes a real crash problem when we do 'perf report'
> on an arm64 platform with arm32 program.
> It is introduced by commit f9b2bdf228 ("perf tools: Find vdso
> with the consider of cross-platform"). From dmesg report, perf
> crashes in dso__type() because dso is NULL.
Ok, I removed f9b2bdf228 because of this crash, Ingo reported it, now
that I see this new patch and checked that the crash was introduced by
f9b2bdf228 I'll just combine those two and test again using a 32-bit
hackbench on top of f9b2bdf228, to reproduce the crash, then on top of
both patches combined.
- Arnaldo
> Still don't know why on x86 it never crash, but it is obviously
> that we need to check the return vaule from __dso__find(): it can
> be NULL.
>
> So please consider pulling.
>
> Thank you.
>
> On 2016/6/22 14:57, He Kuang wrote:
> > We should check if 'dso' is a null pointer before passing it to the
> > function dso__type(), otherwise a segfault will be raised in
> > dso__data_get_fd(). In function machine__find_vdso(), the return value
> > checking of 'dso' is missed and this patch fixes this issue.
> >
> > Signed-off-by: He Kuang <hekuang@huawei.com>
> > ---
> > tools/perf/util/vdso.c | 2 +-
> > 1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/tools/perf/util/vdso.c b/tools/perf/util/vdso.c
> > index 8f81c41..7bdcad4 100644
> > --- a/tools/perf/util/vdso.c
> > +++ b/tools/perf/util/vdso.c
> > @@ -296,7 +296,7 @@ static struct dso *machine__find_vdso(struct machine *machine,
> > if (!dso) {
> > dso = __dsos__find(&machine->dsos, DSO__NAME_VDSO,
> > true);
> > - if (dso_type != dso__type(dso, machine))
> > + if (dso && dso_type != dso__type(dso, machine))
> > dso = NULL;
> > }
> > break;
>
next prev parent reply other threads:[~2016-06-23 12:07 UTC|newest]
Thread overview: 55+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-06-22 6:57 [PATCH 0/5] Fixes on perf unwind He Kuang
2016-06-22 6:57 ` [PATCH 1/5] perf unwind: Change macro names of perf register He Kuang
2016-06-26 10:56 ` [tip:perf/core] " tip-bot for He Kuang
2016-06-22 6:57 ` [PATCH 2/5] perf unwind: Fix wrongly used regs for x86_32 unwind He Kuang
2016-06-26 10:56 ` [tip:perf/core] " tip-bot for He Kuang
2016-06-22 6:57 ` [PATCH 3/5] perf unwind: Fix wrongly used regs for aarch64 unwind He Kuang
2016-06-26 10:57 ` [tip:perf/core] " tip-bot for He Kuang
2016-06-22 6:57 ` [PATCH 4/5] perf tools: Let python use correct gcc for build_ext He Kuang
2016-06-26 10:54 ` [tip:perf/core] " tip-bot for He Kuang
2016-06-22 6:57 ` [PATCH 5/5] perf tools: Fix NULL pointer deference when vdso not found He Kuang
2016-06-23 2:02 ` Wangnan (F)
2016-06-23 3:03 ` Hekuang
2016-06-23 12:07 ` Arnaldo Carvalho de Melo [this message]
2016-06-23 13:28 ` Arnaldo Carvalho de Melo
2016-06-26 10:55 ` [tip:perf/core] perf tools: Find right DSO taking into account if binary is 32 or 64-bit tip-bot for He Kuang
2016-06-23 13:30 ` [PATCH 0/5] Fixes on perf unwind Arnaldo Carvalho de Melo
-- strict thread matches above, loose matches on Subject: below --
2016-05-12 8:43 [PATCH v3 0/7] Add support for remote unwind He Kuang
2016-05-12 8:43 ` [PATCH v3 1/7] perf tools: Set vdso name to vdso[64,32] depending on platform He Kuang
2016-05-12 10:06 ` Adrian Hunter
2016-05-13 8:51 ` [PATCH v3 1/7 UPDATE] perf tools: Find vdso with the consider of cross-platform He Kuang
2016-05-16 13:32 ` Arnaldo Carvalho de Melo
2016-05-17 7:34 ` Adrian Hunter
2016-05-17 7:33 ` Adrian Hunter
2016-05-17 9:04 ` [PATCH v3 1/7 UPDATE2] " He Kuang
2016-05-17 9:17 ` Adrian Hunter
2016-05-17 12:46 ` Arnaldo Carvalho de Melo
2016-06-15 13:34 ` Arnaldo Carvalho de Melo
2016-06-16 0:22 ` Hekuang
2016-06-16 13:00 ` Adrian Hunter
2016-06-16 16:33 ` Arnaldo Carvalho de Melo
2016-05-17 9:05 ` [PATCH v3 1/7 UPDATE] " Hekuang
2016-05-13 8:53 ` [PATCH v3 1/7] perf tools: Set vdso name to vdso[64,32] depending on platform Hekuang
2016-05-12 8:43 ` [PATCH v3 2/7] perf tools: Store vdso buildid unconditionally He Kuang
2016-05-12 13:09 ` Arnaldo Carvalho de Melo
2016-05-20 6:43 ` [tip:perf/urgent] perf symbols: " tip-bot for He Kuang
2016-05-12 8:43 ` [PATCH v3 3/7] perf tools: Remove the logical that skip buildid cache if symfs is given He Kuang
2016-05-12 13:09 ` Arnaldo Carvalho de Melo
2016-05-12 20:23 ` David Ahern
2016-05-12 20:33 ` Arnaldo Carvalho de Melo
2016-05-13 7:19 ` Hekuang
2016-05-13 14:27 ` David Ahern
2016-05-13 18:01 ` Arnaldo Carvalho de Melo
2016-05-14 8:19 ` [PATCH v3 3/7 UPDATE] perf tools: Add option for the path of buildid dsos under symfs He Kuang
2016-05-14 14:43 ` David Ahern
2016-05-16 1:30 ` Hekuang
2016-05-16 2:50 ` David Ahern
2016-05-16 6:40 ` Hekuang
2016-05-18 1:47 ` Hekuang
2016-05-18 1:51 ` David Ahern
2016-05-18 2:48 ` Hekuang
2016-05-18 3:04 ` David Ahern
2016-05-12 8:43 ` [PATCH v3 4/7] perf tools: Promote proper messages for cross-platform unwind He Kuang
2016-05-12 8:43 ` [PATCH v3 5/7] perf callchain: Add support " He Kuang
2016-05-12 8:43 ` [PATCH v3 6/7] perf callchain: Support x86 target platform He Kuang
2016-05-12 8:43 ` [PATCH v3 7/7] perf callchain: Support aarch64 cross-platform He Kuang
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