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| author | Arnaldo Carvalho de Melo <acme@redhat.com> | 2017-02-09 14:48:46 -0300 |
|---|---|---|
| committer | Ben Hutchings <ben@decadent.org.uk> | 2017-06-05 21:17:06 +0100 |
| commit | 6f7c08b2168bb13c5936cdf62c93fe826e5b5e03 (patch) | |
| tree | 32b3b199aed245db424168cfd1ccad7bc38a9840 /tools | |
| parent | 5f1c2e6aa322c4a885d9a99c2a27054848740e77 (diff) | |
| download | linux-stable-6f7c08b2168bb13c5936cdf62c93fe826e5b5e03.tar.gz linux-stable-6f7c08b2168bb13c5936cdf62c93fe826e5b5e03.tar.bz2 linux-stable-6f7c08b2168bb13c5936cdf62c93fe826e5b5e03.zip | |
perf tests: Avoid possible truncation with dirent->d_name + snprintf
commit 2e2bbc039fad9eabad6c4c1a473c8b2554cdd2d4 upstream.
Addressing a few cases spotted by a new warning in gcc 7:
tests/parse-events.c: In function 'test_pmu_events':
tests/parse-events.c:1790:39: error: '%s' directive output may be truncated writing up to 255 bytes into a region of size 90 [-Werror=format-truncation=]
snprintf(name, MAX_NAME, "cpu/event=%s/u", ent->d_name);
^~
In file included from /usr/include/stdio.h:939:0,
from /git/linux/tools/perf/util/map.h:9,
from /git/linux/tools/perf/util/symbol.h:7,
from /git/linux/tools/perf/util/evsel.h:10,
from tests/parse-events.c:3:
/usr/include/bits/stdio2.h:64:10: note: '__builtin___snprintf_chk' output between 13 and 268 bytes into a destination of size 100
return __builtin___snprintf_chk (__s, __n, __USE_FORTIFY_LEVEL - 1,
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
__bos (__s), __fmt, __va_arg_pack ());
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
tests/parse-events.c:1798:29: error: '%s' directive output may be truncated writing up to 255 bytes into a region of size 100 [-Werror=format-truncation=]
snprintf(name, MAX_NAME, "%s:u,cpu/event=%s/u", ent->d_name, ent->d_name);
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Wang Nan <wangnan0@huawei.com>
Fixes: 945aea220bb8 ("perf tests: Move test objects into 'tests' directory")
Link: http://lkml.kernel.org/n/tip-ty4q2p8zp1dp3mskvubxskm5@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
[bwh: Backported to 3.16: only one snprintf() call needs fixing]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Diffstat (limited to 'tools')
| -rw-r--r-- | tools/perf/tests/parse-events.c | 6 |
1 files changed, 2 insertions, 4 deletions
diff --git a/tools/perf/tests/parse-events.c b/tools/perf/tests/parse-events.c index deba66955f8c..bfeecd4b9467 100644 --- a/tools/perf/tests/parse-events.c +++ b/tools/perf/tests/parse-events.c @@ -1539,21 +1539,19 @@ static int test_pmu_events(void) } while (!ret && (ent = readdir(dir))) { -#define MAX_NAME 100 struct evlist_test e; - char name[MAX_NAME]; + char name[2 * NAME_MAX + 1 + 12 + 3]; if (!strcmp(ent->d_name, ".") || !strcmp(ent->d_name, "..")) continue; - snprintf(name, MAX_NAME, "cpu/event=%s/u", ent->d_name); + snprintf(name, sizeof(name), "cpu/event=%s/u", ent->d_name); e.name = name; e.check = test__checkevent_pmu_events; ret = test_event(&e); -#undef MAX_NAME } closedir(dir); |