perf symbols: Handle /proc/sys/kernel/kptr_restrict

[firefly-linux-kernel-4.4.55.git] / tools / perf / util / header.c

diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index 0717bebc76494d24cfc68bec984aba404058438c..afb0849fe530e5f4a06937457bb98644acf681df 100644 (file)
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -193,9 +193,13 @@ int build_id_cache__add_s(const char *sbuild_id, const char *debugdir,
             *linkname = malloc(size), *targetname;
        int len, err = -1;
 
-       if (is_kallsyms)
+       if (is_kallsyms) {
+               if (symbol_conf.kptr_restrict) {
+                       pr_debug("Not caching a kptr_restrict'ed /proc/kallsyms\n");
+                       return 0;
+               }
                realname = (char *)name;
-       else
+       } else
                realname = realpath(name, NULL);
 
        if (realname == NULL || filename == NULL || linkname == NULL)