| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Date: Fri, 24 Jun 2016 13:56:25 +0200
From: Marc Kleine-Budde <mkl@...gutronix.de>
To: Jiri Olsa <jolsa@...hat.com>
Cc: Peter Zijlstra <peterz@...radead.org>,
Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org,
Jiri Olsa <jolsa@...nel.org>
Subject: Re: [PATCH] perf: symbols: dso__load(): remove check of file on
uninitialized memory
On 06/24/2016 01:51 PM, Jiri Olsa wrote:
> On Fri, Jun 24, 2016 at 09:54:22AM +0200, Marc Kleine-Budde wrote:
>> On 06/24/2016 08:43 AM, Jiri Olsa wrote:
>>> On Thu, Jun 23, 2016 at 04:20:21PM +0200, Marc Kleine-Budde wrote:
>>>> In commit "403567217d3f perf symbols: Do not read symbols/data from
>>>> device files" a check to uninitialzied memory was added. This leads to
>>>> the following valgrind output:
>>>>
>>>> ==24515== Syscall param stat(file_name) points to uninitialised byte(s)
>>>> ==24515== at 0x75B26D5: _xstat (in /lib/x86_64-linux-gnu/libc-2.22.so)
>>>> ==24515== by 0x4E548D: stat (stat.h:454)
>>>> ==24515== by 0x4E548D: is_regular_file (util.c:687)
>>>> ==24515== by 0x4A5BEE: dso__load (symbol.c:1435)
>>>> ==24515== by 0x4BB1AE: map__load (map.c:289)
>>>> ==24515== by 0x4BB1AE: map__find_symbol (map.c:333)
>>>> ==24515== by 0x4835B3: thread__find_addr_location (event.c:1300)
>>>> ==24515== by 0x4B5342: add_callchain_ip (machine.c:1652)
>>>> ==24515== by 0x4B5342: thread__resolve_callchain_sample (machine.c:1906)
>>>> ==24515== by 0x4B9E7D: thread__resolve_callchain (machine.c:1958)
>>>> ==24515== by 0x441B3E: process_event (builtin-script.c:795)
>>>> ==24515== by 0x441B3E: process_sample_event (builtin-script.c:920)
>>>> ==24515== by 0x4BEE29: perf_evlist__deliver_sample (session.c:1192)
>>>> ==24515== by 0x4BEE29: machines__deliver_event (session.c:1229)
>>>> ==24515== by 0x4BF770: perf_session__deliver_event (session.c:1286)
>>>> ==24515== by 0x4BF770: ordered_events__deliver_event (session.c:114)
>>>> ==24515== by 0x4C1D17: __ordered_events__flush (ordered-events.c:207)
>>>> ==24515== by 0x4C1D17: ordered_events__flush.part.3 (ordered-events.c:274)
>>>> ==24515== by 0x4BF44C: perf_session__process_user_event (session.c:1325)
>>>> ==24515== by 0x4BF44C: perf_session__process_event (session.c:1451)
>>>> ==24515== Address 0x807c6a0 is 0 bytes inside a block of size 4,096 alloc'd
>>>> ==24515== at 0x4C29C0F: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
>>>> ==24515== by 0x4A5BCB: dso__load (symbol.c:1421)
>>>> ==24515== by 0x4BB1AE: map__load (map.c:289)
>>>> ==24515== by 0x4BB1AE: map__find_symbol (map.c:333)
>>>> ==24515== by 0x4835B3: thread__find_addr_location (event.c:1300)
>>>> ==24515== by 0x4B5342: add_callchain_ip (machine.c:1652)
>>>> ==24515== by 0x4B5342: thread__resolve_callchain_sample (machine.c:1906)
>>>> ==24515== by 0x4B9E7D: thread__resolve_callchain (machine.c:1958)
>>>> ==24515== by 0x441B3E: process_event (builtin-script.c:795)
>>>> ==24515== by 0x441B3E: process_sample_event (builtin-script.c:920)
>>>> ==24515== by 0x4BEE29: perf_evlist__deliver_sample (session.c:1192)
>>>> ==24515== by 0x4BEE29: machines__deliver_event (session.c:1229)
>>>> ==24515== by 0x4BF770: perf_session__deliver_event (session.c:1286)
>>>> ==24515== by 0x4BF770: ordered_events__deliver_event (session.c:114)
>>>> ==24515== by 0x4C1D17: __ordered_events__flush (ordered-events.c:207)
>>>> ==24515== by 0x4C1D17: ordered_events__flush.part.3 (ordered-events.c:274)
>>>> ==24515== by 0x4BF44C: perf_session__process_user_event (session.c:1325)
>>>> ==24515== by 0x4BF44C: perf_session__process_event (session.c:1451)
>>>> ==24515== by 0x4C0EAC: __perf_session__process_events (session.c:1804)
>>>> ==24515== by 0x4C0EAC: perf_session__process_events (session.c:1858)
>>>>
>>>> This patch fixes the problem by removing the check.
>>>>
>>>> Fixes: 403567217d3f perf symbols: Do not read symbols/data from device files
>>>> Signed-off-by: Marc Kleine-Budde <mkl@...gutronix.de>
>>>> ---
>>>> tools/perf/util/symbol.c | 3 +--
>>>> 1 file changed, 1 insertion(+), 2 deletions(-)
>>>>
>>>> diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c
>>>> index 8a747dc6cf86..b4070daeb17f 100644
>>>> --- a/tools/perf/util/symbol.c
>>>> +++ b/tools/perf/util/symbol.c
>>>> @@ -1432,8 +1432,7 @@ int dso__load(struct dso *dso, struct map *map, symbol_filter_t filter)
>>>> * Read the build id if possible. This is required for
>>>> * DSO_BINARY_TYPE__BUILDID_DEBUGINFO to work
>>>> */
>>>> - if (is_regular_file(name) &&
>>>> - filename__read_build_id(dso->long_name, build_id, BUILD_ID_SIZE) > 0)
>>>> + if (filename__read_build_id(dso->long_name, build_id, BUILD_ID_SIZE) > 0)
>>>> dso__set_build_id(dso, build_id);
>>>
>>> ouch copy&paste error.. we better fix it properly,
>>> could you please check attached patch?
>>
>> The use of uninitialized memory is gone, but the "--symfs" option is
>> ignored:
>>
>>> stat("/lib/libpthread-2.20.so", 0x7ffe440c1270) = -1 ENOENT (No such file or directory)
>>
>> You'll look for the dso in the root file system not in the sysroot.
>
> that seems like unrelated to the 'use of uninitialized memory' issue, right?
> I can't see how the patch I sent could do that..
Right. That's a different issue. You can add my:
Acked-by: Marc Kleine-Budde <mkl@...gutronix.de>
thanks,
Marc
--
Pengutronix e.K. | Marc Kleine-Budde |
Industrial Linux Solutions | Phone: +49-231-2826-924 |
Vertretung West/Dortmund | Fax: +49-5121-206917-5555 |
Amtsgericht Hildesheim, HRA 2686 | http://www.pengutronix.de |
Download attachment "signature.asc" of type "application/pgp-signature" (456 bytes)
Powered by blists - more mailing lists