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7dc484fe48
Paul Chaignon says:
====================
Support non-linear skbs for BPF_PROG_TEST_RUN
This patchset adds support for non-linear skbs when running tc programs
with BPF_PROG_TEST_RUN.
We've had multiple bugs in the past few years in Cilium caused by
missing calls to bpf_skb_pull_data(). Daniel suggested to support
non linear skb in BPF_PROG_TEST_RUN to uncover these bugs in
our BPF tests.
Changes in v8:
- Fix uninitialized data pointer spotted by Martin.
- Error out in test_loader if __linear_size tag is used on unsupported
program types.
Changes in v7:
- Refactor use of 'size' variable as suggested by Martin.
- Support copying back the non-linear area to data_out.
- Minor code changes for readability, suggested by Martin.
Changes in v6:
- Disallow non-linear skb in prog_run_skb only for LWT programs
instead of all non-L2 program types, on suggestion from Martin.
- Reject non-null ctx->data and ctx->data_meta, as suggested by Amery.
- Bound linear_size to 'PAGE_SIZE - headroom - tailroom' to be
consistent with prog_run_xdp, as suggested by Martin.
- Allocate exactly linear_size bytes in bpf_test_init, spotted by
Martin.
- Fix wrong conflict resolution on double-free fix, spotted by Amery.
- Rebased.
Changes in v5:
- Fix double free on data in first patch.
Changes in v4:
- Per Martin's suggestion, follow the XDP code pattern and use
bpf_test_init only to initialize the linear area. That way data is
directly copied to the right areas and we avoid the call to
__pskb_pull_tail.
- Fixed outdated commit descriptions.
- Rebased.
Changes in v3:
- Dropped BPF_F_TEST_SKB_NON_LINEAR and used the ctx->data_end to
determine if the user wants non-linear skb, as suggested by Amery.
- Introduced a second commit with a bit of refactoring to allow for
the above requested change.
- Fix bug found by syzkaller on third commit.
- Rebased.
Changes in v2:
- Made the linear size configurable via ctx->data_end, as suggested
by Amery.
- Reworked the selftests to allow testing the configurable linear
size.
- Fix warnings reported by kernel test robot on first commit.
- Rebased.
====================
Link: https://patch.msgid.link/cover.1760037899.git.paul.chaignon@gmail.com
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
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