Re: [PATCH bpf 2/2] selftests/bpf: Add tests for allowed helpers

This patch adds tests that bpf_ktime_get_coarse_ns() and bpf_timer_* and
bpf_spin_lock()/bpf_spin_unlock() helpers are forbidden in tracing
progs as it may result in various locking issues.

Signed-off-by: Dmitrii Banshchikov <redacted>
---
 tools/testing/selftests/bpf/test_verifier.c   |  36 +++-
 .../selftests/bpf/verifier/helper_allowed.c   | 196 ++++++++++++++++++
 2 files changed, 231 insertions(+), 1 deletion(-)
 create mode 100644 tools/testing/selftests/bpf/verifier/helper_allowed.c

diff --git a/tools/testing/selftests/bpf/test_verifier.c b/tools/testing/selftests/bpf/test_verifier.c
index 25afe423b3f0..e16eab6fc3a9 100644
--- a/tools/testing/selftests/bpf/test_verifier.c
+++ b/tools/testing/selftests/bpf/test_verifier.c

@@ -92,6 +92,7 @@ struct bpf_test {
 	int fixup_map_event_output[MAX_FIXUPS];
 	int fixup_map_reuseport_array[MAX_FIXUPS];
 	int fixup_map_ringbuf[MAX_FIXUPS];
+	int fixup_map_timer[MAX_FIXUPS];
 	/* Expected verifier log output for result REJECT or VERBOSE_ACCEPT.
 	 * Can be a tab-separated sequence of expected strings. An empty string
 	 * means no log verification.

@@ -605,7 +606,7 @@ static int create_cgroup_storage(bool percpu)
  *   struct bpf_spin_lock l;
  * };
  */
-static const char btf_str_sec[] = "\0bpf_spin_lock\0val\0cnt\0l";
+static const char btf_str_sec[] = "\0bpf_spin_lock\0val\0cnt\0l\0bpf_timer\0";