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| author |   Yonghong Song <yhs@fb.com> | 2017-05-02 19:58:14 -0700 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2017-05-03 09:51:25 -0400 |
| commit | 6ead18fb18c8182a81d70f24942f9547e56a35d2 (patch) | |
| tree | 06dfd33dbb26086f8cc593f51a6e47f53f784200 /tools/testing/selftests/bpf/gnu | |
| parent | xdp: use common helper for netlink extended ack reporting (diff) | |
| download | linux-dev-6ead18fb18c8182a81d70f24942f9547e56a35d2.tar.xz linux-dev-6ead18fb18c8182a81d70f24942f9547e56a35d2.zip | |
selftests/bpf: add a test case to check verifier pointer arithmetic
With clang/llvm 4.0+, the test case is able to generate
the following pattern:
....
440: (b7) r1 = 15
441: (05) goto pc+73
515: (79) r6 = *(u64 *)(r10 -152)
516: (bf) r7 = r10
517: (07) r7 += -112
518: (bf) r2 = r7
519: (0f) r2 += r1
520: (71) r1 = *(u8 *)(r8 +0)
521: (73) *(u8 *)(r2 +45) = r1
....
commit 332270fdc8b6 ("bpf: enhance verifier to understand stack
pointer arithmetic") improved verifier to handle such a pattern.
This patch adds a C test case to actually generate such a pattern.
A dummy tracepoint interface is used to load the program
into the kernel.
Signed-off-by: Yonghong Song <yhs@fb.com>
Acked-by: Martin KaFai Lau <kafai@fb.com>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'tools/testing/selftests/bpf/gnu')
0 files changed, 0 insertions, 0 deletions