[PATCH 4/4] libbpf: Search /lib64 and /lib in resolve_full_path()

["Ricardo B. Marlière" <rbm@suse.com>]

attach_probe/uprobe-lib and uprobe_autoattach selftests fail with "failed
to resolve full path for libc.so.6" on older non-usrmerged distros, where
libc.so.6 lives under a top-level /lib64 or /lib rather than /usr/lib64 or
/usr/lib. Add /lib64:/lib to the search paths, alongside the existing
/usr/lib64:/usr/lib and Debian multiarch entries.

Signed-off-by: Ricardo B. Marlière <rbm@suse.com>
---
 tools/lib/bpf/libbpf.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
index 1368752aa13c..1ab939dfb7f0 100644
--- a/tools/lib/bpf/libbpf.c
+++ b/tools/lib/bpf/libbpf.c
@@ -12973,13 +12973,14 @@ static const char *arch_specific_lib_paths(void)
 /* Get full path to program/shared library. */
 static int resolve_full_path(const char *file, char *result, size_t result_sz)
 {
-	const char *search_paths[3] = {};
+	const char *search_paths[4] = {};
 	int i, perm;
 
 	if (str_has_sfx(file, ".so") || strstr(file, ".so.")) {
 		search_paths[0] = getenv("LD_LIBRARY_PATH");
 		search_paths[1] = "/usr/lib64:/usr/lib";
 		search_paths[2] = arch_specific_lib_paths();
+		search_paths[3] = "/lib64:/lib";
 		perm = R_OK;
 	} else {
 		search_paths[0] = getenv("PATH");

-- 
2.54.0