linux-kernel - [PATCH v1 4/8] perf ftrace: Use sig_atomic

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Message-Id: <20221024173523.602064-5-irogers@google.com>
Date:   Mon, 24 Oct 2022 10:35:19 -0700
From:   Ian Rogers <irogers@...gle.com>
To:     Leo Yan <leo.yan@...aro.org>,
        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@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Alexey Bayduraev <alexey.v.bayduraev@...ux.intel.com>,
        German Gomez <german.gomez@....com>,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Stephane Eranian <eranian@...gle.com>,
        Ian Rogers <irogers@...gle.com>
Subject: [PATCH v1 4/8] perf ftrace: Use sig_atomic_t to avoid UB

Use sig_atomic_t for a variable written to in a signal handler and
read elsewhere. This is undefined behavior as per:
https://wiki.sei.cmu.edu/confluence/display/c/SIG31-C.+Do+not+access+shared+objects+in+signal+handlers

Signed-off-by: Ian Rogers <irogers@...gle.com>
---
 tools/perf/builtin-ftrace.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/perf/builtin-ftrace.c b/tools/perf/builtin-ftrace.c
index 7de07bb16d23..d7fe00f66b83 100644
--- a/tools/perf/builtin-ftrace.c
+++ b/tools/perf/builtin-ftrace.c
@@ -36,8 +36,8 @@
 
 #define DEFAULT_TRACER  "function_graph"
 
-static volatile int workload_exec_errno;
-static bool done;
+static volatile sig_atomic_t workload_exec_errno;
+static volatile sig_atomic_t done;
 
 static void sig_handler(int sig __maybe_unused)
 {
-- 
2.38.0.135.g90850a2211-goog