diff mbox series

[bpf-next,1/2] bpf: fix cgroup_skb prog test run direct packet access

Message ID 20241125152603.375898-1-mahe.tardy@gmail.com (mailing list archive)
State New
Delegated to: BPF
Headers show
Series [bpf-next,1/2] bpf: fix cgroup_skb prog test run direct packet access | expand

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Commit Message

Mahe Tardy Nov. 25, 2024, 3:26 p.m. UTC 
This is needed in the context of Tetragon to test cgroup_skb programs
using BPF_PROG_TEST_RUN with direct packet access.

Commit b39b5f411dcf ("bpf: add cg_skb_is_valid_access for
BPF_PROG_TYPE_CGROUP_SKB") added direct packet access for cgroup_skb
programs and following commit 2cb494a36c98 ("bpf: add tests for direct
packet access from CGROUP_SKB") added tests to the verifier to ensure
that access to skb fields was possible and also fixed
bpf_prog_test_run_skb. However, is_direct_pkt_access was never set to
true for this program type, so data pointers were not computed when
using prog_test_run, making data_end always equal to zero (data_meta is
not accessible for cgroup_skb).

Signed-off-by: Mahe Tardy <mahe.tardy@gmail.com>
---
 net/bpf/test_run.c | 1 +
 1 file changed, 1 insertion(+)

--
2.34.1
diff mbox series

Patch

diff --git a/net/bpf/test_run.c b/net/bpf/test_run.c
index 501ec4249fed..5586c1392607 100644
--- a/net/bpf/test_run.c
+++ b/net/bpf/test_run.c
@@ -1018,6 +1018,7 @@  int bpf_prog_test_run_skb(struct bpf_prog *prog, const union bpf_attr *kattr,
 	case BPF_PROG_TYPE_LWT_IN:
 	case BPF_PROG_TYPE_LWT_OUT:
 	case BPF_PROG_TYPE_LWT_XMIT:
+	case BPF_PROG_TYPE_CGROUP_SKB:
 		is_direct_pkt_access = true;
 		break;
 	default: