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authorArnaldo Carvalho de Melo <acme@redhat.com>2020-03-02 11:23:03 -0300
committerArnaldo Carvalho de Melo <acme@redhat.com>2020-03-02 11:23:03 -0300
commitebcb9464a2ae3a547e97de476575c82ece0e93e2 (patch)
treedc434255f86483e86cb6675d7a37759bccf7b4b7
parentperf tests bp_account: Make global variable static (diff)
downloadlinux-dev-ebcb9464a2ae3a547e97de476575c82ece0e93e2.tar.xz
linux-dev-ebcb9464a2ae3a547e97de476575c82ece0e93e2.zip
perf env: Do not return pointers to local variables
It is possible to return a pointer to a local variable when looking up the architecture name for the running system and no normalization is done on that value, i.e. we may end up returning the uts.machine local variable. While this doesn't happen on most arches, as normalization takes place, lets fix this by making that a static variable and optimize it a bit by not always running uname(), only the first time. Noticed in fedora rawhide running with: [perfbuilder@a5ff49d6e6e4 ~]$ gcc --version gcc (GCC) 10.0.1 20200216 (Red Hat 10.0.1-0.8) Reported-by: Jiri Olsa <jolsa@kernel.org> Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Namhyung Kim <namhyung@kernel.org> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to '')
-rw-r--r--tools/perf/util/env.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/tools/perf/util/env.c b/tools/perf/util/env.c
index 6242a9215df7..4154f944f474 100644
--- a/tools/perf/util/env.c
+++ b/tools/perf/util/env.c
@@ -343,11 +343,11 @@ static const char *normalize_arch(char *arch)
const char *perf_env__arch(struct perf_env *env)
{
- struct utsname uts;
char *arch_name;
if (!env || !env->arch) { /* Assume local operation */
- if (uname(&uts) < 0)
+ static struct utsname uts = { .machine[0] = '\0', };
+ if (uts.machine[0] == '\0' && uname(&uts) < 0)
return NULL;
arch_name = uts.machine;
} else