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| author | John Fastabend <john.fastabend@gmail.com> | 2020-05-29 10:29:18 -0700 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2020-05-29 13:34:06 -0700 |
| commit | cf66c29bd7534813d2e1971fab71e25fe87c7e0a (patch) | |
| tree | eb3bc7075c713962947025b9927e9e71eaeb5a26 | |
| parent | e3effcdfe02eb20f23d4f1833c75658ddc49e65a (diff) | |
| download | linux-cf66c29bd7534813d2e1971fab71e25fe87c7e0a.tar.bz2 | |
bpf, selftests: Add a verifier test for assigning 32bit reg states to 64bit ones
Added a verifier test for assigning 32bit reg states to
64bit where 32bit reg holds a constant value of 0.
Without previous kernel verifier.c fix, the test in
this patch will fail.
Signed-off-by: Yonghong Song <yhs@fb.com>
Signed-off-by: John Fastabend <john.fastabend@gmail.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/159077335867.6014.2075350327073125374.stgit@john-Precision-5820-Tower
| -rw-r--r-- | tools/testing/selftests/bpf/verifier/bounds.c | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/tools/testing/selftests/bpf/verifier/bounds.c b/tools/testing/selftests/bpf/verifier/bounds.c index fafa5409bdac..58f4aa593b1b 100644 --- a/tools/testing/selftests/bpf/verifier/bounds.c +++ b/tools/testing/selftests/bpf/verifier/bounds.c @@ -535,3 +535,25 @@ }, .result = ACCEPT }, +{ + "assigning 32bit bounds to 64bit for wA = 0, wB = wA", + .insns = { + BPF_LDX_MEM(BPF_W, BPF_REG_8, BPF_REG_1, + offsetof(struct __sk_buff, data_end)), + BPF_LDX_MEM(BPF_W, BPF_REG_7, BPF_REG_1, + offsetof(struct __sk_buff, data)), + BPF_MOV32_IMM(BPF_REG_9, 0), + BPF_MOV32_REG(BPF_REG_2, BPF_REG_9), + BPF_MOV64_REG(BPF_REG_6, BPF_REG_7), + BPF_ALU64_REG(BPF_ADD, BPF_REG_6, BPF_REG_2), + BPF_MOV64_REG(BPF_REG_3, BPF_REG_6), + BPF_ALU64_IMM(BPF_ADD, BPF_REG_3, 8), + BPF_JMP_REG(BPF_JGT, BPF_REG_3, BPF_REG_8, 1), + BPF_LDX_MEM(BPF_W, BPF_REG_5, BPF_REG_6, 0), + BPF_MOV64_IMM(BPF_REG_0, 0), + BPF_EXIT_INSN(), + }, + .prog_type = BPF_PROG_TYPE_SCHED_CLS, + .result = ACCEPT, + .flags = F_NEEDS_EFFICIENT_UNALIGNED_ACCESS, +}, |