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

Message ID d6f48c9cb8b7981fd037a19a8cfbba5def40f2ea.1738439839.git.dxu@dxuuu.xyz (mailing list archive)
State Superseded
Delegated to: BPF
Headers show
Series bpf: Some fixes for nullness elision | expand

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bpf/vmtest-bpf-next-PR success PR summary
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netdev/fixes_present success Fixes tag not required for -next series
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit fail Errors and warnings before: 5 this patch: 5
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netdev/deprecated_api success None detected
netdev/check_selftest success No net selftest shell script
netdev/verify_fixes success No Fixes tag
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Commit Message

Daniel Xu Feb. 1, 2025, 7:58 p.m. UTC 
Test that very high constant map keys are not interpreted as an error
value by the verifier. This would previously fail.

Signed-off-by: Daniel Xu <dxu@dxuuu.xyz>
---
 .../selftests/bpf/progs/verifier_array_access.c   | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

Comments

Eduard Zingerman Feb. 3, 2025, 6:48 p.m. UTC | #1 
On Sat, 2025-02-01 at 12:58 -0700, Daniel Xu wrote:
> Test that very high constant map keys are not interpreted as an error
> value by the verifier. This would previously fail.
> 
> Signed-off-by: Daniel Xu <dxu@dxuuu.xyz>
> ---

Acked-by: Eduard Zingerman <eddyz87@gmail.com>

[...]
diff mbox series

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";