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author | Maxim Mikityanskiy <maximmi@nvidia.com> | 2021-12-07 11:15:21 +0300 |
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committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-12-14 13:32:46 +0300 |
commit | d428e5477493946b77d1071e84b1475241974930 (patch) | |
tree | d7ef7358a6909dd68e485eb07a8df550b1bbadb4 /scripts | |
parent | 0ec0eda3f3c3483872157a7780cebdf9bf3a11c4 (diff) | |
download | linux-d428e5477493946b77d1071e84b1475241974930.tar.xz |
bpf: Add selftests to cover packet access corner cases
commit b560b21f71eb4ef9dfc7c8ec1d0e4d7f9aa54b51 upstream.
This commit adds BPF verifier selftests that cover all corner cases by
packet boundary checks. Specifically, 8-byte packet reads are tested at
the beginning of data and at the beginning of data_meta, using all kinds
of boundary checks (all comparison operators: <, >, <=, >=; both
permutations of operands: data + length compared to end, end compared to
data + length). For each case there are three tests:
1. Length is just enough for an 8-byte read. Length is either 7 or 8,
depending on the comparison.
2. Length is increased by 1 - should still pass the verifier. These
cases are useful, because they failed before commit 2fa7d94afc1a
("bpf: Fix the off-by-two error in range markings").
3. Length is decreased by 1 - should be rejected by the verifier.
Some existing tests are just renamed to avoid duplication.
Signed-off-by: Maxim Mikityanskiy <maximmi@nvidia.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20211207081521.41923-1-maximmi@nvidia.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'scripts')
0 files changed, 0 insertions, 0 deletions