[bpf-next,v2,2/3] bpf: selftests: Test constant key extraction on irrelevant maps

Commit Message

Daniel Xu Feb. 4, 2025, 5:25 p.m. UTC

Test that very high constant map keys are not interpreted as an error
value by the verifier. This would previously fail.

Acked-by: Eduard Zingerman <[e-mail]>
Signed-off-by: Daniel Xu <[e-mail]>
---
 .../selftests/bpf/progs/verifier_array_access.c   | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

Patch

diff --git a/tools/testing/selftests/bpf/progs/verifier_array_access.c b/tools/testing/selftests/bpf/progs/verifier_array_access.c
index 29eb9568633f..0a187ff725cc 100644
--- a/tools/testing/selftests/bpf/progs/verifier_array_access.c
+++ b/tools/testing/selftests/bpf/progs/verifier_array_access.c
@@ -713,4 +713,19 @@  unsigned int non_stack_key_lookup(void)
 	return val->index;
 }
 
+SEC("socket")
+__description("doesn't reject UINT64_MAX as s64 for irrelevant maps")
+__success __retval(42)
+unsigned int doesnt_reject_irrelevant_maps(void)
+{
+	__u64 key = 0xFFFFFFFFFFFFFFFF;
+	struct test_val *val;
+
+	val = bpf_map_lookup_elem(&map_hash_48b, &key);
+	if (val)
+		return val->index;
+
+	return 42;
+}
+
 char _license[] SEC("license") = "GPL";