This is a note to let you know that I've just added the patch titled
libbpf: Fix logic for finding matching program for CO-RE relocation
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
libbpf-fix-logic-for-finding-matching-program-for-co.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit d226963c7942277b093dd9d802045d3fb3677cfb
Author: Andrii Nakryiko <andrii@xxxxxxxxxx>
Date: Mon Apr 25 17:45:04 2022 -0700
libbpf: Fix logic for finding matching program for CO-RE relocation
[ Upstream commit 966a7509325395c51c5f6d89e7352b0585e4804b ]
Fix the bug in bpf_object__relocate_core() which can lead to finding
invalid matching BPF program when processing CO-RE relocation. IF
matching program is not found, last encountered program will be assumed
to be correct program and thus error detection won't detect the problem.
Fixes: 9c82a63cf370 ("libbpf: Fix CO-RE relocs against .text section")
Signed-off-by: Andrii Nakryiko <andrii@xxxxxxxxxx>
Signed-off-by: Alexei Starovoitov <ast@xxxxxxxxxx>
Link: https://lore.kernel.org/bpf/20220426004511.2691730-4-andrii@xxxxxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
index 5612d0938fc9..1ba2dd3523f8 100644
--- a/tools/lib/bpf/libbpf.c
+++ b/tools/lib/bpf/libbpf.c
@@ -5221,9 +5221,10 @@ bpf_object__relocate_core(struct bpf_object *obj, const char *targ_btf_path)
*/
prog = NULL;
for (i = 0; i < obj->nr_programs; i++) {
- prog = &obj->programs[i];
- if (strcmp(prog->sec_name, sec_name) == 0)
+ if (strcmp(obj->programs[i].sec_name, sec_name) == 0) {
+ prog = &obj->programs[i];
break;
+ }
}
if (!prog) {
pr_warn("sec '%s': failed to find a BPF program\n", sec_name);
