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Date:   Fri, 19 Apr 2019 09:35:17 -0400
From:   Sasha Levin <sashal@kernel.org>
To:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        linux-kernel@vger.kernel.org, stable@vger.kernel.org,
        Changbin Du <changbin.du@gmail.com>,
        Jiri Olsa <jolsa@kernel.org>,
        Alexei Starovoitov <ast@kernel.org>,
        Daniel Borkmann <daniel@iogearbox.net>,
        Namhyung Kim <namhyung@kernel.org>,
        Peter Zijlstra <peterz@infradead.org>,
        "Steven Rostedt (VMware)" <rostedt@goodmis.org>,
        Arnaldo Carvalho de Melo <acme@redhat.com>
Subject: Re: [PATCH 5.0 39/93] perf top: Delete the evlist before
 perf_session, fixing heap-use-after-free issue
Message-ID: <20190419133517.GE17719@sasha-vm>
References: <20190418160436.781762249@linuxfoundation.org>
 <20190418160441.339477070@linuxfoundation.org>
 <20190418193143.aq2i7g2upngge7e6@xps.therub.org>
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On Thu, Apr 18, 2019 at 02:31:43PM -0500, Dan Rue wrote:
>On Thu, Apr 18, 2019 at 07:57:17PM +0200, Greg Kroah-Hartman wrote:
>> [ Upstream commit 0dba9e4be95b59e77060645ca8e37ca3231061f5 ]
>>
>> The evlist should be destroyed before the perf session.
>>
>> Detected with gcc's ASan:
>>
>>   =================================================================
>>   ==27350==ERROR: AddressSanitizer: heap-use-after-free on address 0x62b000002e38 at pc 0x5611da276999 bp 0x7ffce8f1d1a0 sp 0x7ffce8f1d190
>>   WRITE of size 8 at 0x62b000002e38 thread T0
>>       #0 0x5611da276998 in __list_del /home/work/linux/tools/include/linux/list.h:89
>>       #1 0x5611da276d4a in __list_del_entry /home/work/linux/tools/include/linux/list.h:102
>>       #2 0x5611da276e77 in list_del_init /home/work/linux/tools/include/linux/list.h:145
>>       #3 0x5611da2781cd in thread__put util/thread.c:130
>>       #4 0x5611da2cc0a8 in __thread__zput util/thread.h:68
>>       #5 0x5611da2d2dcb in hist_entry__delete util/hist.c:1148
>>       #6 0x5611da2cdf91 in hists__delete_entry util/hist.c:337
>>       #7 0x5611da2ce19e in hists__delete_entries util/hist.c:365
>>       #8 0x5611da2db2ab in hists__delete_all_entries util/hist.c:2639
>>       #9 0x5611da2db325 in hists_evsel__exit util/hist.c:2651
>>       #10 0x5611da1c5352 in perf_evsel__exit util/evsel.c:1304
>>       #11 0x5611da1c5390 in perf_evsel__delete util/evsel.c:1309
>>       #12 0x5611da1b35f0 in perf_evlist__purge util/evlist.c:124
>>       #13 0x5611da1b38e2 in perf_evlist__delete util/evlist.c:148
>>       #14 0x5611da069781 in cmd_top /home/changbin/work/linux/tools/perf/builtin-top.c:1645
>>       #15 0x5611da17d038 in run_builtin /home/changbin/work/linux/tools/perf/perf.c:302
>>       #16 0x5611da17d577 in handle_internal_command /home/changbin/work/linux/tools/perf/perf.c:354
>>       #17 0x5611da17d97b in run_argv /home/changbin/work/linux/tools/perf/perf.c:398
>>       #18 0x5611da17e0e9 in main /home/changbin/work/linux/tools/perf/perf.c:520
>>       #19 0x7fdcc970f09a in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x2409a)
>>       #20 0x5611d9ff35c9 in _start (/home/work/linux/tools/perf/perf+0x3e95c9)
>>
>>   0x62b000002e38 is located 11320 bytes inside of 27448-byte region [0x62b000000200,0x62b000006d38)
>>   freed by thread T0 here:
>>       #0 0x7fdccb04ab70 in free (/usr/lib/x86_64-linux-gnu/libasan.so.5+0xedb70)
>>       #1 0x5611da260df4 in perf_session__delete util/session.c:201
>>       #2 0x5611da063de5 in __cmd_top /home/changbin/work/linux/tools/perf/builtin-top.c:1300
>>       #3 0x5611da06973c in cmd_top /home/changbin/work/linux/tools/perf/builtin-top.c:1642
>>       #4 0x5611da17d038 in run_builtin /home/changbin/work/linux/tools/perf/perf.c:302
>>       #5 0x5611da17d577 in handle_internal_command /home/changbin/work/linux/tools/perf/perf.c:354
>>       #6 0x5611da17d97b in run_argv /home/changbin/work/linux/tools/perf/perf.c:398
>>       #7 0x5611da17e0e9 in main /home/changbin/work/linux/tools/perf/perf.c:520
>>       #8 0x7fdcc970f09a in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x2409a)
>>
>>   previously allocated by thread T0 here:
>>       #0 0x7fdccb04b138 in calloc (/usr/lib/x86_64-linux-gnu/libasan.so.5+0xee138)
>>       #1 0x5611da26010c in zalloc util/util.h:23
>>       #2 0x5611da260824 in perf_session__new util/session.c:118
>>       #3 0x5611da0633a6 in __cmd_top /home/changbin/work/linux/tools/perf/builtin-top.c:1192
>>       #4 0x5611da06973c in cmd_top /home/changbin/work/linux/tools/perf/builtin-top.c:1642
>>       #5 0x5611da17d038 in run_builtin /home/changbin/work/linux/tools/perf/perf.c:302
>>       #6 0x5611da17d577 in handle_internal_command /home/changbin/work/linux/tools/perf/perf.c:354
>>       #7 0x5611da17d97b in run_argv /home/changbin/work/linux/tools/perf/perf.c:398
>>       #8 0x5611da17e0e9 in main /home/changbin/work/linux/tools/perf/perf.c:520
>>       #9 0x7fdcc970f09a in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x2409a)
>>
>>   SUMMARY: AddressSanitizer: heap-use-after-free /home/work/linux/tools/include/linux/list.h:89 in __list_del
>>   Shadow bytes around the buggy address:
>>     0x0c567fff8570: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
>>     0x0c567fff8580: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
>>     0x0c567fff8590: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
>>     0x0c567fff85a0: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
>>     0x0c567fff85b0: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
>>   =>0x0c567fff85c0: fd fd fd fd fd fd fd[fd]fd fd fd fd fd fd fd fd
>>     0x0c567fff85d0: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
>>     0x0c567fff85e0: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
>>     0x0c567fff85f0: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
>>     0x0c567fff8600: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
>>     0x0c567fff8610: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
>>   Shadow byte legend (one shadow byte represents 8 application bytes):
>>     Addressable:           00
>>     Partially addressable: 01 02 03 04 05 06 07
>>     Heap left redzone:       fa
>>     Freed heap region:       fd
>>     Stack left redzone:      f1
>>     Stack mid redzone:       f2
>>     Stack right redzone:     f3
>>     Stack after return:      f5
>>     Stack use after scope:   f8
>>     Global redzone:          f9
>>     Global init order:       f6
>>     Poisoned by user:        f7
>>     Container overflow:      fc
>>     Array cookie:            ac
>>     Intra object redzone:    bb
>>     ASan internal:           fe
>>     Left alloca redzone:     ca
>>     Right alloca redzone:    cb
>>   ==27350==ABORTING
>
>I'm seeing the following build error as a result of this patch being
>backported to 5.0:
>
>    builtin-top.c: In function ‘__cmd_top’:
>    builtin-top.c:1241:3: error: label ‘out_delete’ used but not defined
>       goto out_delete;
>       ^~~~
>      CC       builtin-script.o
>
>Dropping this patch from 5.0 (along with ad59b96f965a ("perf data: Don't store
>auxtrace index for directory data file") does fix the perf build.

Now dropped, thanks again!

--
Thanks,
Sasha