[PATCH net-next 14/14] selftests/bpf: Use non-trivial test payload in xdp_context tests
From: Jakub Sitnicki <jakub@cloudflare.com>
Date: 2026-08-14 08:14:48
Also in:
bpf
Subsystem:
bpf [general] (safe dynamic programs and tools), bpf [selftests] (test runners & infrastructure), kernel selftest framework, the rest, xdp (express data path) · Maintainers:
Alexei Starovoitov, Daniel Borkmann, Andrii Nakryiko, Eduard Zingerman, Kumar Kartikeya Dwivedi, Shuah Khan, Shuah Khan, Linus Torvalds, David S. Miller, Jakub Kicinski, Jesper Dangaard Brouer, John Fastabend
Replace the sequential test payload pattern (0x01..0x38) with higher-entropy values that don't alias common protocol header fields such as IP version/IHL or ethertype LSBs. This reduces the chance of false positives from stray packets. Signed-off-by: Jakub Sitnicki <jakub@cloudflare.com> --- tools/testing/selftests/bpf/prog_tests/xdp_context_test_run.c | 8 ++++---- tools/testing/selftests/bpf/progs/test_xdp_meta.c | 8 ++++---- 2 files changed, 8 insertions(+), 8 deletions(-)
diff --git a/tools/testing/selftests/bpf/prog_tests/xdp_context_test_run.c b/tools/testing/selftests/bpf/prog_tests/xdp_context_test_run.c
index f5fbc19757e3..8bf586b5af32 100644
--- a/tools/testing/selftests/bpf/prog_tests/xdp_context_test_run.c
+++ b/tools/testing/selftests/bpf/prog_tests/xdp_context_test_run.c@@ -21,10 +21,10 @@ #define TEST_PAYLOAD_LEN 32 static const __u8 test_payload[TEST_PAYLOAD_LEN] = { - 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, - 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, - 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28, - 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38, + 0x49, 0x20, 0x63, 0x72, 0x6f, 0x73, 0x73, 0x65, + 0x64, 0x20, 0x68, 0x6f, 0x6f, 0x6b, 0x73, 0x20, + 0x26, 0x20, 0x6c, 0x69, 0x76, 0x65, 0x64, 0x20, + 0x74, 0x6f, 0x20, 0x74, 0x65, 0x6c, 0x6c, 0x21, }; void test_xdp_context_error(int prog_fd, struct bpf_test_run_opts opts,
diff --git a/tools/testing/selftests/bpf/progs/test_xdp_meta.c b/tools/testing/selftests/bpf/progs/test_xdp_meta.c
index 4c224d5fe1b2..b0ab7f4f7a1b 100644
--- a/tools/testing/selftests/bpf/progs/test_xdp_meta.c
+++ b/tools/testing/selftests/bpf/progs/test_xdp_meta.c@@ -24,10 +24,10 @@ bool test_pass; static const __u8 meta_want[META_SIZE] = { - 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, - 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, - 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28, - 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38, + 0x49, 0x20, 0x63, 0x72, 0x6f, 0x73, 0x73, 0x65, + 0x64, 0x20, 0x68, 0x6f, 0x6f, 0x6b, 0x73, 0x20, + 0x26, 0x20, 0x6c, 0x69, 0x76, 0x65, 0x64, 0x20, + 0x74, 0x6f, 0x20, 0x74, 0x65, 0x6c, 0x6c, 0x21, }; static bool check_metadata(const char *file, int line, __u8 *meta_have)
--
2.43.0