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authorArnaldo Carvalho de Melo <acme@redhat.com>2017-02-08 17:01:46 -0300
committerArnaldo Carvalho de Melo <acme@redhat.com>2017-02-08 17:31:28 -0300
commitbdf23a9a190d7ecea092fd5c4aabb7d4bd0a9980 (patch)
treed48d3026e20371925323aad7205aa4cdfa1e09bb /tools
parent7b0214b702ad8e124e039a317beeebb3f020d125 (diff)
downloadlinux-bdf23a9a190d7ecea092fd5c4aabb7d4bd0a9980.tar.bz2
perf thread_map: Correctly size buffer used with dirent->dt_name
The size of dirent->dt_name is NAME_MAX + 1, but the size for the 'path' buffer is hard coded at 256, which may truncate it because we also prepend "/proc/", so that all that into account and thank gcc 7 for this warning: /git/linux/tools/perf/util/thread_map.c: In function 'thread_map__new_by_uid': /git/linux/tools/perf/util/thread_map.c:119:39: error: '%s' directive output may be truncated writing up to 255 bytes into a region of size 250 [-Werror=format-truncation=] snprintf(path, sizeof(path), "/proc/%s", dirent->d_name); ^~ In file included from /usr/include/stdio.h:939:0, from /git/linux/tools/perf/util/thread_map.c:5: /usr/include/bits/stdio2.h:64:10: note: '__builtin___snprintf_chk' output between 7 and 262 bytes into a destination of size 256 return __builtin___snprintf_chk (__s, __n, __USE_FORTIFY_LEVEL - 1, ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ __bos (__s), __fmt, __va_arg_pack ()); ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 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> Link: http://lkml.kernel.org/n/tip-csy0r8zrvz5efccgd4k12c82@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools')
-rw-r--r--tools/perf/util/thread_map.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/tools/perf/util/thread_map.c b/tools/perf/util/thread_map.c
index f9eab200fd75..7c3fcc538a70 100644
--- a/tools/perf/util/thread_map.c
+++ b/tools/perf/util/thread_map.c
@@ -93,7 +93,7 @@ struct thread_map *thread_map__new_by_uid(uid_t uid)
{
DIR *proc;
int max_threads = 32, items, i;
- char path[256];
+ char path[NAME_MAX + 1 + 6];
struct dirent *dirent, **namelist = NULL;
struct thread_map *threads = thread_map__alloc(max_threads);