netdev - Re: [PATCH v6 00/10] Improvements to memory usage by parse events

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Date:   Thu, 7 Nov 2019 19:23:15 -0300
From:   Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>
To:     Ian Rogers <irogers@...gle.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        Andi Kleen <ak@...ux.intel.com>,
        Jin Yao <yao.jin@...ux.intel.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Kan Liang <kan.liang@...ux.intel.com>,
        John Garry <john.garry@...wei.com>,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        bpf@...r.kernel.org, clang-built-linux@...glegroups.com,
        Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH v6 00/10] Improvements to memory usage by parse events

Em Thu, Nov 07, 2019 at 02:14:18PM -0800, Ian Rogers escreveu:
> The parse events parser leaks memory for certain expressions as well
> as allowing a char* to reference stack, heap or .rodata. This series
> of patches improves the hygeine and adds free-ing operations to
> reclaim memory in the parser in error and non-error situations.
> 
> The series of patches was generated with LLVM's address sanitizer and
> libFuzzer:
> https://llvm.org/docs/LibFuzzer.html
> called on the parse_events function with randomly generated input. With
> the patches no leaks or memory corruption issues were present.
> 
> The v6 patches address a C90 compilation issue.

Please take a look at what is in my perf/core branch, to see what is
left, if something needs fixing, please send a patch on top of that,

Thanks,

- Arnaldo
 
> The v5 patches add initial error print to the set, as requested by
> Jiri Olsa. They also fix additional 2 missed frees in the patch
> 'before yyabort-ing free components' and remove a redundant new_str
> variable from the patch 'add parse events handle error' as spotted by
> Stephane Eranian.
> 
> The v4 patches address review comments from Jiri Olsa, turning a long
> error message into a single warning, fixing the data type in a list
> iterator and reordering patches.
> 
> The v3 patches address review comments from Jiri Olsa improving commit
> messages, handling ENOMEM errors from strdup better, and removing a
> printed warning if an invalid event is passed.
> 
> The v2 patches are preferable to an earlier proposed patch:
>    perf tools: avoid reading out of scope array
> 
> Ian Rogers (10):
>   perf tools: add parse events handle error
>   perf tools: move ALLOC_LIST into a function
>   perf tools: avoid a malloc for array events
>   perf tools: splice events onto evlist even on error
>   perf tools: ensure config and str in terms are unique
>   perf tools: add destructors for parse event terms
>   perf tools: before yyabort-ing free components
>   perf tools: if pmu configuration fails free terms
>   perf tools: add a deep delete for parse event terms
>   perf tools: report initial event parsing error
> 
>  tools/perf/arch/powerpc/util/kvm-stat.c |   9 +-
>  tools/perf/builtin-stat.c               |   2 +
>  tools/perf/builtin-trace.c              |  16 +-
>  tools/perf/tests/parse-events.c         |   3 +-
>  tools/perf/util/metricgroup.c           |   2 +-
>  tools/perf/util/parse-events.c          | 239 +++++++++++----
>  tools/perf/util/parse-events.h          |   7 +
>  tools/perf/util/parse-events.y          | 390 +++++++++++++++++-------
>  tools/perf/util/pmu.c                   |  32 +-
>  9 files changed, 511 insertions(+), 189 deletions(-)
> 
> -- 
> 2.24.0.432.g9d3f5f5b63-goog

-- 

- Arnaldo