4.4-stable review patch. If anyone has any objections, please let me know.
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From: Ben Hutchings ben@decadent.org.uk
commit 11a64a05dc649815670b1be9fe63d205cb076401 upstream.
Depending on which functions are inlined in util/pmu.c, the snprintf() calls in perf_pmu__parse_{scale,unit,per_pkg,snapshot}() might trigger a warning:
util/pmu.c: In function 'pmu_aliases': util/pmu.c:178:31: error: '%s' directive output may be truncated writing up to 255 bytes into a region of size between 0 and 4095 [-Werror=format-truncation=] snprintf(path, PATH_MAX, "%s/%s.unit", dir, name); ^~
I found this when trying to build perf from Linux 3.16 with gcc 8. However I can reproduce the problem in mainline if I force __perf_pmu__new_alias() to be inlined.
Suppress this by using scnprintf() as has been done elsewhere in perf.
Signed-off-by: Ben Hutchings ben@decadent.org.uk Cc: Alexander Shishkin alexander.shishkin@linux.intel.com Cc: Jiri Olsa jolsa@redhat.com Cc: Namhyung Kim namhyung@kernel.org Cc: Peter Zijlstra peterz@infradead.org Cc: stable@vger.kernel.org Link: http://lkml.kernel.org/r/20181111184524.fux4taownc6ndbx6@decadent.org.uk Signed-off-by: Arnaldo Carvalho de Melo acme@redhat.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- tools/perf/util/pmu.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-)
--- a/tools/perf/util/pmu.c +++ b/tools/perf/util/pmu.c @@ -100,7 +100,7 @@ static int perf_pmu__parse_scale(struct char path[PATH_MAX]; const char *lc;
- snprintf(path, PATH_MAX, "%s/%s.scale", dir, name); + scnprintf(path, PATH_MAX, "%s/%s.scale", dir, name);
fd = open(path, O_RDONLY); if (fd == -1) @@ -147,7 +147,7 @@ static int perf_pmu__parse_unit(struct p ssize_t sret; int fd;
- snprintf(path, PATH_MAX, "%s/%s.unit", dir, name); + scnprintf(path, PATH_MAX, "%s/%s.unit", dir, name);
fd = open(path, O_RDONLY); if (fd == -1) @@ -177,7 +177,7 @@ perf_pmu__parse_per_pkg(struct perf_pmu_ char path[PATH_MAX]; int fd;
- snprintf(path, PATH_MAX, "%s/%s.per-pkg", dir, name); + scnprintf(path, PATH_MAX, "%s/%s.per-pkg", dir, name);
fd = open(path, O_RDONLY); if (fd == -1) @@ -195,7 +195,7 @@ static int perf_pmu__parse_snapshot(stru char path[PATH_MAX]; int fd;
- snprintf(path, PATH_MAX, "%s/%s.snapshot", dir, name); + scnprintf(path, PATH_MAX, "%s/%s.snapshot", dir, name);
fd = open(path, O_RDONLY); if (fd == -1)