Commit-ID: 3aff8ba0a4c9c9191bb788171a1c54778e1246a2
Gitweb: http://git.kernel.org/tip/3aff8ba0a4c9c9191bb788171a1c54778e1246a2
Author: Arnaldo Carvalho de Melo <a...@redhat.com>
AuthorDate: Thu, 9 Feb 2017 14:39:42 -0300
Committer: Arnaldo Carvalho de Melo <a...@redhat.com>
CommitDate: Thu, 9 Feb 2017 14:39:42 -0300
perf bench numa: Avoid possible truncation when using snprintf()
Addressing this warning from gcc 7:
CC /tmp/build/perf/bench/numa.o
bench/numa.c: In function '__bench_numa':
bench/numa.c:1582:42: error: '%d' directive output may be truncated writing
between 1 and 10 bytes into a region of size between 8 and 17
[-Werror=format-truncation=]
snprintf(tname, 32, "process%d:thread%d", p, t);
^~
bench/numa.c:1582:25: note: directive argument in the range [0, 2147483647]
snprintf(tname, 32, "process%d:thread%d", p, t);
^~~~~~~~~~~~~~~~~~~~
In file included from /usr/include/stdio.h:939:0,
from bench/../util/util.h:47,
from bench/../builtin.h:4,
from bench/numa.c:11:
/usr/include/bits/stdio2.h:64:10: note: '__builtin___snprintf_chk' output
between 17 and 35 bytes into a destination of size 32
return __builtin___snprintf_chk (__s, __n, __USE_FORTIFY_LEVEL - 1,
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
__bos (__s), __fmt, __va_arg_pack ());
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
cc1: all warnings being treated as errors
Cc: Adrian Hunter <adrian.hun...@intel.com>
Cc: David Ahern <dsah...@gmail.com>
Cc: Jiri Olsa <jo...@kernel.org>
Cc: Namhyung Kim <namhy...@kernel.org>
Cc: Petr Holasek <phola...@redhat.com>
Cc: Wang Nan <wangn...@huawei.com>
Link: http://lkml.kernel.org/n/tip-twa37vsfqcie5gwpqwnju...@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <a...@redhat.com>
---
tools/perf/bench/numa.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/tools/perf/bench/numa.c b/tools/perf/bench/numa.c
index 8efe904..9e5a02d 100644
--- a/tools/perf/bench/numa.c
+++ b/tools/perf/bench/numa.c
@@ -1573,13 +1573,13 @@ static int __bench_numa(const char *name)
"GB/sec,", "total-speed", "GB/sec total speed");
if (g->p.show_details >= 2) {
- char tname[32];
+ char tname[14 + 2 * 10 + 1];
struct thread_data *td;
for (p = 0; p < g->p.nr_proc; p++) {
for (t = 0; t < g->p.nr_threads; t++) {
- memset(tname, 0, 32);
+ memset(tname, 0, sizeof(tname));
td = g->threads + p*g->p.nr_threads + t;
- snprintf(tname, 32, "process%d:thread%d", p, t);
+ snprintf(tname, sizeof(tname),
"process%d:thread%d", p, t);
print_res(tname, td->speed_gbs,
"GB/sec", "thread-speed",
"GB/sec/thread speed");
print_res(tname, td->system_time_ns /
NSEC_PER_SEC,
