selftests/bpf: Add test case to assert precise scalar path pruning
Add a test case to check for precision marking of safe paths. Ensure that the verifier will not prematurely prune scalars contributing to registers needing precision. Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
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@ -217,3 +217,39 @@
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.errstr = "invalid access to memory, mem_size=1 off=42 size=8",
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.result = REJECT,
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},
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{
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"precise: program doesn't prematurely prune branches",
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.insns = {
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BPF_ALU64_IMM(BPF_MOV, BPF_REG_6, 0x400),
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BPF_ALU64_IMM(BPF_MOV, BPF_REG_7, 0),
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BPF_ALU64_IMM(BPF_MOV, BPF_REG_8, 0),
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BPF_ALU64_IMM(BPF_MOV, BPF_REG_9, 0x80000000),
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BPF_ALU64_IMM(BPF_MOD, BPF_REG_6, 0x401),
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BPF_JMP_IMM(BPF_JA, 0, 0, 0),
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BPF_JMP_REG(BPF_JLE, BPF_REG_6, BPF_REG_9, 2),
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BPF_ALU64_IMM(BPF_MOD, BPF_REG_6, 1),
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BPF_ALU64_IMM(BPF_MOV, BPF_REG_9, 0),
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BPF_JMP_REG(BPF_JLE, BPF_REG_6, BPF_REG_9, 1),
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BPF_ALU64_IMM(BPF_MOV, BPF_REG_6, 0),
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BPF_ALU64_IMM(BPF_MOV, BPF_REG_0, 0),
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BPF_STX_MEM(BPF_W, BPF_REG_10, BPF_REG_0, -4),
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BPF_LD_MAP_FD(BPF_REG_4, 0),
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BPF_ALU64_REG(BPF_MOV, BPF_REG_1, BPF_REG_4),
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BPF_ALU64_REG(BPF_MOV, BPF_REG_2, BPF_REG_10),
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BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -4),
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BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_map_lookup_elem),
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BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 1),
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BPF_EXIT_INSN(),
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BPF_ALU64_IMM(BPF_RSH, BPF_REG_6, 10),
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BPF_ALU64_IMM(BPF_MUL, BPF_REG_6, 8192),
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BPF_ALU64_REG(BPF_MOV, BPF_REG_1, BPF_REG_0),
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BPF_ALU64_REG(BPF_ADD, BPF_REG_0, BPF_REG_6),
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BPF_LDX_MEM(BPF_DW, BPF_REG_3, BPF_REG_0, 0),
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BPF_STX_MEM(BPF_DW, BPF_REG_1, BPF_REG_3, 0),
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BPF_EXIT_INSN(),
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},
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.fixup_map_array_48b = { 13 },
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.prog_type = BPF_PROG_TYPE_XDP,
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.result = REJECT,
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.errstr = "register with unbounded min value is not allowed",
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},
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