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selftests/bpf: Add asm tests for pkt vs pkt_end comparison.
Add few assembly tests for packet comparison.
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Tested-by: Jiri Olsa <jolsa@redhat.com>
Acked-by: John Fastabend <john.fastabend@gmail.com>
Link: https://lore.kernel.org/bpf/20201111031213.25109-4-alexei.starovoitov@gmail.com
authored by
Alexei Starovoitov
and committed by
Daniel Borkmann
cb62d340
9cc873e8
+42
+42
tools/testing/selftests/bpf/verifier/ctx_skb.c
+42
tools/testing/selftests/bpf/verifier/ctx_skb.c
···
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.errstr_unpriv = "R1 leaks addr",
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.result = REJECT,
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},
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+
{
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+
"pkt > pkt_end taken check",
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+
.insns = {
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BPF_LDX_MEM(BPF_W, BPF_REG_2, BPF_REG_1, // 0. r2 = *(u32 *)(r1 + data_end)
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offsetof(struct __sk_buff, data_end)),
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+
BPF_LDX_MEM(BPF_W, BPF_REG_4, BPF_REG_1, // 1. r4 = *(u32 *)(r1 + data)
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offsetof(struct __sk_buff, data)),
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BPF_MOV64_REG(BPF_REG_3, BPF_REG_4), // 2. r3 = r4
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+
BPF_ALU64_IMM(BPF_ADD, BPF_REG_3, 42), // 3. r3 += 42
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+
BPF_MOV64_IMM(BPF_REG_1, 0), // 4. r1 = 0
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+
BPF_JMP_REG(BPF_JGT, BPF_REG_3, BPF_REG_2, 2), // 5. if r3 > r2 goto 8
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+
BPF_ALU64_IMM(BPF_ADD, BPF_REG_4, 14), // 6. r4 += 14
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+
BPF_MOV64_REG(BPF_REG_1, BPF_REG_4), // 7. r1 = r4
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+
BPF_JMP_REG(BPF_JGT, BPF_REG_3, BPF_REG_2, 1), // 8. if r3 > r2 goto 10
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+
BPF_LDX_MEM(BPF_H, BPF_REG_2, BPF_REG_1, 9), // 9. r2 = *(u8 *)(r1 + 9)
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+
BPF_MOV64_IMM(BPF_REG_0, 0), // 10. r0 = 0
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+
BPF_EXIT_INSN(), // 11. exit
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},
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.result = ACCEPT,
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+
.prog_type = BPF_PROG_TYPE_SK_SKB,
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+
},
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+
{
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+
"pkt_end < pkt taken check",
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+
.insns = {
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BPF_LDX_MEM(BPF_W, BPF_REG_2, BPF_REG_1, // 0. r2 = *(u32 *)(r1 + data_end)
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offsetof(struct __sk_buff, data_end)),
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+
BPF_LDX_MEM(BPF_W, BPF_REG_4, BPF_REG_1, // 1. r4 = *(u32 *)(r1 + data)
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+
offsetof(struct __sk_buff, data)),
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+
BPF_MOV64_REG(BPF_REG_3, BPF_REG_4), // 2. r3 = r4
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+
BPF_ALU64_IMM(BPF_ADD, BPF_REG_3, 42), // 3. r3 += 42
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+
BPF_MOV64_IMM(BPF_REG_1, 0), // 4. r1 = 0
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+
BPF_JMP_REG(BPF_JGT, BPF_REG_3, BPF_REG_2, 2), // 5. if r3 > r2 goto 8
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+
BPF_ALU64_IMM(BPF_ADD, BPF_REG_4, 14), // 6. r4 += 14
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+
BPF_MOV64_REG(BPF_REG_1, BPF_REG_4), // 7. r1 = r4
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+
BPF_JMP_REG(BPF_JLT, BPF_REG_2, BPF_REG_3, 1), // 8. if r2 < r3 goto 10
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+
BPF_LDX_MEM(BPF_H, BPF_REG_2, BPF_REG_1, 9), // 9. r2 = *(u8 *)(r1 + 9)
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+
BPF_MOV64_IMM(BPF_REG_0, 0), // 10. r0 = 0
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+
BPF_EXIT_INSN(), // 11. exit
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+
},
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+
.result = ACCEPT,
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+
.prog_type = BPF_PROG_TYPE_SK_SKB,
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+
},