bpf: selftests: Test constant key extraction on irrelevant maps

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 <eddyz87@gmail.com>
Signed-off-by: Daniel Xu <dxu@dxuuu.xyz>
Link: https://lore.kernel.org/r/c0590b62eb9303f389b2f52c0c7e9cf22a358a30.1738689872.git.dxu@dxuuu.xyz
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

diff --git a/tools/testing/selftests/bpf/progs/verifier_array_access.c b/tools/testing/selftests/bpf/progs/verifier_array_access.c
index 29eb9568633ffae20f3bf6b7fd24ceef6789f462..0a187ff725cc478c374841e7c990ac2f9ef0f6a9 100644 (file)
--- 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";