This is a note to let you know that I've just added the patch titled
selftests/bpf: fix stacktrace_build_id with missing kprobe/urandom_read
to the 5.18-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:
selftests-bpf-fix-stacktrace_build_id-with-missing-k.patch
and it can be found in the queue-5.18 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit f63502c33024c89f59c3389b3f2a2450fea19fc9
Author: Song Liu <song@xxxxxxxxxx>
Date: Thu May 26 12:16:08 2022 -0700
selftests/bpf: fix stacktrace_build_id with missing kprobe/urandom_read
[ Upstream commit 59ed76fe2f981bccde37bdddb465f260a96a2404 ]
Kernel function urandom_read is replaced with urandom_read_iter.
Therefore, kprobe on urandom_read is not working any more:
[root@eth50-1 bpf]# ./test_progs -n 161
test_stacktrace_build_id:PASS:skel_open_and_load 0 nsec
libbpf: kprobe perf_event_open() failed: No such file or directory
libbpf: prog 'oncpu': failed to create kprobe 'urandom_read+0x0' \
perf event: No such file or directory
libbpf: prog 'oncpu': failed to auto-attach: -2
test_stacktrace_build_id:FAIL:attach_tp err -2
161 stacktrace_build_id:FAIL
Fix this by replacing urandom_read with urandom_read_iter in the test.
Fixes: 1b388e7765f2 ("random: convert to using fops->read_iter()")
Reported-by: Mykola Lysenko <mykolal@xxxxxx>
Signed-off-by: Song Liu <song@xxxxxxxxxx>
Acked-by: David Vernet <void@xxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20220526191608.2364049-1-song@xxxxxxxxxx
Signed-off-by: Alexei Starovoitov <ast@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/tools/testing/selftests/bpf/progs/test_stacktrace_build_id.c b/tools/testing/selftests/bpf/progs/test_stacktrace_build_id.c
index 6c62bfb8bb6f..0c4426592a26 100644
--- a/tools/testing/selftests/bpf/progs/test_stacktrace_build_id.c
+++ b/tools/testing/selftests/bpf/progs/test_stacktrace_build_id.c
@@ -39,7 +39,7 @@ struct {
__type(value, stack_trace_t);
} stack_amap SEC(".maps");
-SEC("kprobe/urandom_read")
+SEC("kprobe/urandom_read_iter")
int oncpu(struct pt_regs *args)
{
__u32 max_len = sizeof(struct bpf_stack_build_id)
