diff options
authorArnaldo Carvalho de Melo <acme@redhat.com>2018-12-06 11:29:48 -0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2019-01-26 09:37:04 +0100
commit9010bb9eaa30a52d3155a18eb0907dc9c5c77fb2 (patch)
parente5ae88fabeab15a87ea4663d7a9ca98a9b593b74 (diff)
perf svghelper: Fix unchecked usage of strncpy()
[ Upstream commit 2f5302533f306d5ee87bd375aef9ca35b91762cb ] The strncpy() function may leave the destination string buffer unterminated, better use strlcpy() that we have a __weak fallback implementation for systems without it. In this specific case this would only happen if fgets() was buggy, as its man page states that it should read one less byte than the size of the destination buffer, so that it can put the nul byte at the end of it, so it would never copy 255 non-nul chars, as fgets reads into the orig buffer at most 254 non-nul chars and terminates it. But lets just switch to strlcpy to keep the original intent and silence the gcc 8.2 warning. This fixes this warning on an Alpine Linux Edge system with gcc 8.2: In function 'cpu_model', inlined from 'svg_cpu_box' at util/svghelper.c:378:2: util/svghelper.c:337:5: error: 'strncpy' output may be truncated copying 255 bytes from a string of length 255 [-Werror=stringop-truncation] strncpy(cpu_m, &buf[13], 255); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Arjan van de Ven <arjan@linux.intel.com> Fixes: f48d55ce7871 ("perf: Add a SVG helper library file") Link: https://lkml.kernel.org/n/tip-xzkoo0gyr56gej39ltivuh9g@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> Signed-off-by: Sasha Levin <sashal@kernel.org>
1 files changed, 1 insertions, 1 deletions
diff --git a/tools/perf/util/svghelper.c b/tools/perf/util/svghelper.c
index 1cbada2dc6be..f735ee038713 100644
--- a/tools/perf/util/svghelper.c
+++ b/tools/perf/util/svghelper.c
@@ -334,7 +334,7 @@ static char *cpu_model(void)
if (file) {
while (fgets(buf, 255, file)) {
if (strstr(buf, "model name")) {
- strncpy(cpu_m, &buf[13], 255);
+ strlcpy(cpu_m, &buf[13], 255);