linux-kernel - [PATCH v1 6/8] perf stat: Use sig_atomic

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Date:   Mon, 24 Oct 2022 10:35:21 -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 6/8] perf stat: Use sig_atomic_t to avoid UB

Use sig_atomic_t for variables written/accessed in signal
handlers. 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-stat.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index 265b05157972..13bb8508d228 100644
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -83,6 +83,7 @@
 #include <inttypes.h>
 #include <locale.h>
 #include <math.h>
+#include <stdatomic.h>
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <sys/wait.h>
@@ -173,7 +174,7 @@ static struct target target = {
 
 #define METRIC_ONLY_LEN 20
 
-static volatile pid_t		child_pid			= -1;
+static volatile sig_atomic_t	child_pid			= -1;
 static int			detailed_run			=  0;
 static bool			transaction_run;
 static bool			topdown_run			= false;
@@ -208,7 +209,7 @@ struct perf_stat {
 static struct perf_stat		perf_stat;
 #define STAT_RECORD		perf_stat.record
 
-static volatile int done = 0;
+static volatile sig_atomic_t done = 0;
 
 static struct perf_stat_config stat_config = {
 	.aggr_mode		= AGGR_GLOBAL,
@@ -569,7 +570,7 @@ static void disable_counters(void)
 	}
 }
 
-static volatile int workload_exec_errno;
+static volatile sig_atomic_t workload_exec_errno;
 
 /*
  * evlist__prepare_workload will send a SIGUSR1
@@ -1029,7 +1030,7 @@ static void print_counters(struct timespec *ts, int argc, const char **argv)
 	evlist__print_counters(evsel_list, &stat_config, &target, ts, argc, argv);
 }
 
-static volatile int signr = -1;
+static volatile sig_atomic_t signr = -1;
 
 static void skip_signal(int signo)
 {
-- 
2.38.0.135.g90850a2211-goog