linux-kernel - [PATCH v2 0/9] Improvements to memory usage by parse events

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Message-Id: <20191023005337.196160-1-irogers@google.com>
Date:   Tue, 22 Oct 2019 17:53:28 -0700
From:   Ian Rogers <irogers@...gle.com>
To:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        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
Cc:     Stephane Eranian <eranian@...gle.com>,
        Ian Rogers <irogers@...gle.com>
Subject: [PATCH v2 0/9] Improvements to memory usage by parse events

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.

These patches are preferable to an earlier proposed patch:
   perf tools: avoid reading out of scope array

Ian Rogers (9):
  perf tools: add parse events append error
  perf tools: splice events onto evlist even on error
  perf tools: ensure config and str in terms are unique
  perf tools: move ALLOC_LIST into a function
  perf tools: avoid a malloc for array events
  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

 tools/perf/util/parse-events.c | 177 ++++++++++-----
 tools/perf/util/parse-events.h |   3 +
 tools/perf/util/parse-events.y | 388 ++++++++++++++++++++++++---------
 tools/perf/util/pmu.c          |  38 ++--
 4 files changed, 431 insertions(+), 175 deletions(-)

-- 
2.23.0.866.gb869b98d4c-goog