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 Accepted
Commit a4bc2d977a67b423bb04959661d6627bac3d8c8f
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

Comments

patchwork-bot+netdevbpf@kernel.org Nov. 25, 2024, 10:20 p.m. UTC | #1 
Hello:

This series was applied to bpf/bpf-next.git (master)
by Alexei Starovoitov <ast@kernel.org>:

On Mon, 25 Nov 2024 15:26:02 +0000 you wrote:
> 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).
> 
> [...]

Here is the summary with links:
  - [bpf-next,1/2] bpf: fix cgroup_skb prog test run direct packet access
    https://git.kernel.org/bpf/bpf-next/c/a4bc2d977a67
  - [bpf-next,2/2] selftests/bpf: add cgroup skb direct packet access test
    https://git.kernel.org/bpf/bpf-next/c/6398ef949aba

You are awesome, thank you!
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: