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selftests/bpf: Asm tests for the verifier regalloc tracking.
Add asm tests for register allocator tracking logic. Signed-off-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Andrii Nakryiko <andrii@kernel.org> Link: https://lore.kernel.org/bpf/20201009011240.48506-5-alexei.starovoitov@gmail.com
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Alexei Starovoitov
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Daniel Borkmann
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Oct 9, 2020
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,243 @@ | ||
| { | ||
| "regalloc basic", | ||
| .insns = { | ||
| BPF_MOV64_REG(BPF_REG_6, BPF_REG_1), | ||
| BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 0), | ||
| BPF_MOV64_REG(BPF_REG_2, BPF_REG_10), | ||
| BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -8), | ||
| BPF_LD_MAP_FD(BPF_REG_1, 0), | ||
| BPF_EMIT_CALL(BPF_FUNC_map_lookup_elem), | ||
| BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 8), | ||
| BPF_MOV64_REG(BPF_REG_7, BPF_REG_0), | ||
| BPF_EMIT_CALL(BPF_FUNC_get_prandom_u32), | ||
| BPF_MOV64_REG(BPF_REG_2, BPF_REG_0), | ||
| BPF_JMP_IMM(BPF_JSGT, BPF_REG_0, 20, 4), | ||
| BPF_JMP_IMM(BPF_JSLT, BPF_REG_2, 0, 3), | ||
| BPF_ALU64_REG(BPF_ADD, BPF_REG_7, BPF_REG_0), | ||
| BPF_ALU64_REG(BPF_ADD, BPF_REG_7, BPF_REG_2), | ||
| BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_7, 0), | ||
| BPF_EXIT_INSN(), | ||
| }, | ||
| .fixup_map_hash_48b = { 4 }, | ||
| .result = ACCEPT, | ||
| .prog_type = BPF_PROG_TYPE_TRACEPOINT, | ||
| }, | ||
| { | ||
| "regalloc negative", | ||
| .insns = { | ||
| BPF_MOV64_REG(BPF_REG_6, BPF_REG_1), | ||
| BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 0), | ||
| BPF_MOV64_REG(BPF_REG_2, BPF_REG_10), | ||
| BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -8), | ||
| BPF_LD_MAP_FD(BPF_REG_1, 0), | ||
| BPF_EMIT_CALL(BPF_FUNC_map_lookup_elem), | ||
| BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 8), | ||
| BPF_MOV64_REG(BPF_REG_7, BPF_REG_0), | ||
| BPF_EMIT_CALL(BPF_FUNC_get_prandom_u32), | ||
| BPF_MOV64_REG(BPF_REG_2, BPF_REG_0), | ||
| BPF_JMP_IMM(BPF_JSGT, BPF_REG_0, 24, 4), | ||
| BPF_JMP_IMM(BPF_JSLT, BPF_REG_2, 0, 3), | ||
| BPF_ALU64_REG(BPF_ADD, BPF_REG_7, BPF_REG_0), | ||
| BPF_ALU64_REG(BPF_ADD, BPF_REG_7, BPF_REG_2), | ||
| BPF_LDX_MEM(BPF_B, BPF_REG_0, BPF_REG_7, 0), | ||
| BPF_EXIT_INSN(), | ||
| }, | ||
| .fixup_map_hash_48b = { 4 }, | ||
| .result = REJECT, | ||
| .errstr = "invalid access to map value, value_size=48 off=48 size=1", | ||
| .prog_type = BPF_PROG_TYPE_TRACEPOINT, | ||
| }, | ||
| { | ||
| "regalloc src_reg mark", | ||
| .insns = { | ||
| BPF_MOV64_REG(BPF_REG_6, BPF_REG_1), | ||
| BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 0), | ||
| BPF_MOV64_REG(BPF_REG_2, BPF_REG_10), | ||
| BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -8), | ||
| BPF_LD_MAP_FD(BPF_REG_1, 0), | ||
| BPF_EMIT_CALL(BPF_FUNC_map_lookup_elem), | ||
| BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 9), | ||
| BPF_MOV64_REG(BPF_REG_7, BPF_REG_0), | ||
| BPF_EMIT_CALL(BPF_FUNC_get_prandom_u32), | ||
| BPF_MOV64_REG(BPF_REG_2, BPF_REG_0), | ||
| BPF_JMP_IMM(BPF_JSGT, BPF_REG_0, 20, 5), | ||
| BPF_MOV64_IMM(BPF_REG_3, 0), | ||
| BPF_JMP_REG(BPF_JSGE, BPF_REG_3, BPF_REG_2, 3), | ||
| BPF_ALU64_REG(BPF_ADD, BPF_REG_7, BPF_REG_0), | ||
| BPF_ALU64_REG(BPF_ADD, BPF_REG_7, BPF_REG_2), | ||
| BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_7, 0), | ||
| BPF_EXIT_INSN(), | ||
| }, | ||
| .fixup_map_hash_48b = { 4 }, | ||
| .result = ACCEPT, | ||
| .prog_type = BPF_PROG_TYPE_TRACEPOINT, | ||
| }, | ||
| { | ||
| "regalloc src_reg negative", | ||
| .insns = { | ||
| BPF_MOV64_REG(BPF_REG_6, BPF_REG_1), | ||
| BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 0), | ||
| BPF_MOV64_REG(BPF_REG_2, BPF_REG_10), | ||
| BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -8), | ||
| BPF_LD_MAP_FD(BPF_REG_1, 0), | ||
| BPF_EMIT_CALL(BPF_FUNC_map_lookup_elem), | ||
| BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 9), | ||
| BPF_MOV64_REG(BPF_REG_7, BPF_REG_0), | ||
| BPF_EMIT_CALL(BPF_FUNC_get_prandom_u32), | ||
| BPF_MOV64_REG(BPF_REG_2, BPF_REG_0), | ||
| BPF_JMP_IMM(BPF_JSGT, BPF_REG_0, 22, 5), | ||
| BPF_MOV64_IMM(BPF_REG_3, 0), | ||
| BPF_JMP_REG(BPF_JSGE, BPF_REG_3, BPF_REG_2, 3), | ||
| BPF_ALU64_REG(BPF_ADD, BPF_REG_7, BPF_REG_0), | ||
| BPF_ALU64_REG(BPF_ADD, BPF_REG_7, BPF_REG_2), | ||
| BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_7, 0), | ||
| BPF_EXIT_INSN(), | ||
| }, | ||
| .fixup_map_hash_48b = { 4 }, | ||
| .result = REJECT, | ||
| .errstr = "invalid access to map value, value_size=48 off=44 size=8", | ||
| .prog_type = BPF_PROG_TYPE_TRACEPOINT, | ||
| }, | ||
| { | ||
| "regalloc and spill", | ||
| .insns = { | ||
| BPF_MOV64_REG(BPF_REG_6, BPF_REG_1), | ||
| BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 0), | ||
| BPF_MOV64_REG(BPF_REG_2, BPF_REG_10), | ||
| BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -8), | ||
| BPF_LD_MAP_FD(BPF_REG_1, 0), | ||
| BPF_EMIT_CALL(BPF_FUNC_map_lookup_elem), | ||
| BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 11), | ||
| BPF_MOV64_REG(BPF_REG_7, BPF_REG_0), | ||
| BPF_EMIT_CALL(BPF_FUNC_get_prandom_u32), | ||
| BPF_MOV64_REG(BPF_REG_2, BPF_REG_0), | ||
| BPF_JMP_IMM(BPF_JSGT, BPF_REG_0, 20, 7), | ||
| /* r0 has upper bound that should propagate into r2 */ | ||
| BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_2, -8), /* spill r2 */ | ||
| BPF_MOV64_IMM(BPF_REG_0, 0), | ||
| BPF_MOV64_IMM(BPF_REG_2, 0), /* clear r0 and r2 */ | ||
| BPF_LDX_MEM(BPF_DW, BPF_REG_3, BPF_REG_10, -8), /* fill r3 */ | ||
| BPF_JMP_REG(BPF_JSGE, BPF_REG_0, BPF_REG_3, 2), | ||
| /* r3 has lower and upper bounds */ | ||
| BPF_ALU64_REG(BPF_ADD, BPF_REG_7, BPF_REG_3), | ||
| BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_7, 0), | ||
| BPF_EXIT_INSN(), | ||
| }, | ||
| .fixup_map_hash_48b = { 4 }, | ||
| .result = ACCEPT, | ||
| .prog_type = BPF_PROG_TYPE_TRACEPOINT, | ||
| }, | ||
| { | ||
| "regalloc and spill negative", | ||
| .insns = { | ||
| BPF_MOV64_REG(BPF_REG_6, BPF_REG_1), | ||
| BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 0), | ||
| BPF_MOV64_REG(BPF_REG_2, BPF_REG_10), | ||
| BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -8), | ||
| BPF_LD_MAP_FD(BPF_REG_1, 0), | ||
| BPF_EMIT_CALL(BPF_FUNC_map_lookup_elem), | ||
| BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 11), | ||
| BPF_MOV64_REG(BPF_REG_7, BPF_REG_0), | ||
| BPF_EMIT_CALL(BPF_FUNC_get_prandom_u32), | ||
| BPF_MOV64_REG(BPF_REG_2, BPF_REG_0), | ||
| BPF_JMP_IMM(BPF_JSGT, BPF_REG_0, 48, 7), | ||
| /* r0 has upper bound that should propagate into r2 */ | ||
| BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_2, -8), /* spill r2 */ | ||
| BPF_MOV64_IMM(BPF_REG_0, 0), | ||
| BPF_MOV64_IMM(BPF_REG_2, 0), /* clear r0 and r2 */ | ||
| BPF_LDX_MEM(BPF_DW, BPF_REG_3, BPF_REG_10, -8), /* fill r3 */ | ||
| BPF_JMP_REG(BPF_JSGE, BPF_REG_0, BPF_REG_3, 2), | ||
| /* r3 has lower and upper bounds */ | ||
| BPF_ALU64_REG(BPF_ADD, BPF_REG_7, BPF_REG_3), | ||
| BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_7, 0), | ||
| BPF_EXIT_INSN(), | ||
| }, | ||
| .fixup_map_hash_48b = { 4 }, | ||
| .result = REJECT, | ||
| .errstr = "invalid access to map value, value_size=48 off=48 size=8", | ||
| .prog_type = BPF_PROG_TYPE_TRACEPOINT, | ||
| }, | ||
| { | ||
| "regalloc three regs", | ||
| .insns = { | ||
| BPF_MOV64_REG(BPF_REG_6, BPF_REG_1), | ||
| BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 0), | ||
| BPF_MOV64_REG(BPF_REG_2, BPF_REG_10), | ||
| BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -8), | ||
| BPF_LD_MAP_FD(BPF_REG_1, 0), | ||
| BPF_EMIT_CALL(BPF_FUNC_map_lookup_elem), | ||
| BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 10), | ||
| BPF_MOV64_REG(BPF_REG_7, BPF_REG_0), | ||
| BPF_EMIT_CALL(BPF_FUNC_get_prandom_u32), | ||
| BPF_MOV64_REG(BPF_REG_2, BPF_REG_0), | ||
| BPF_MOV64_REG(BPF_REG_4, BPF_REG_2), | ||
| BPF_JMP_IMM(BPF_JSGT, BPF_REG_0, 12, 5), | ||
| BPF_JMP_IMM(BPF_JSLT, BPF_REG_2, 0, 4), | ||
| BPF_ALU64_REG(BPF_ADD, BPF_REG_7, BPF_REG_0), | ||
| BPF_ALU64_REG(BPF_ADD, BPF_REG_7, BPF_REG_2), | ||
| BPF_ALU64_REG(BPF_ADD, BPF_REG_7, BPF_REG_4), | ||
| BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_7, 0), | ||
| BPF_EXIT_INSN(), | ||
| }, | ||
| .fixup_map_hash_48b = { 4 }, | ||
| .result = ACCEPT, | ||
| .prog_type = BPF_PROG_TYPE_TRACEPOINT, | ||
| }, | ||
| { | ||
| "regalloc after call", | ||
| .insns = { | ||
| BPF_MOV64_REG(BPF_REG_6, BPF_REG_1), | ||
| BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 0), | ||
| BPF_MOV64_REG(BPF_REG_2, BPF_REG_10), | ||
| BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -8), | ||
| BPF_LD_MAP_FD(BPF_REG_1, 0), | ||
| BPF_EMIT_CALL(BPF_FUNC_map_lookup_elem), | ||
| BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 10), | ||
| BPF_MOV64_REG(BPF_REG_7, BPF_REG_0), | ||
| BPF_EMIT_CALL(BPF_FUNC_get_prandom_u32), | ||
| BPF_MOV64_REG(BPF_REG_8, BPF_REG_0), | ||
| BPF_MOV64_REG(BPF_REG_9, BPF_REG_0), | ||
| BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 6), | ||
| BPF_JMP_IMM(BPF_JSGT, BPF_REG_8, 20, 4), | ||
| BPF_JMP_IMM(BPF_JSLT, BPF_REG_9, 0, 3), | ||
| BPF_ALU64_REG(BPF_ADD, BPF_REG_7, BPF_REG_8), | ||
| BPF_ALU64_REG(BPF_ADD, BPF_REG_7, BPF_REG_9), | ||
| BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_7, 0), | ||
| BPF_EXIT_INSN(), | ||
| BPF_MOV64_IMM(BPF_REG_0, 0), | ||
| BPF_EXIT_INSN(), | ||
| }, | ||
| .fixup_map_hash_48b = { 4 }, | ||
| .result = ACCEPT, | ||
| .prog_type = BPF_PROG_TYPE_TRACEPOINT, | ||
| }, | ||
| { | ||
| "regalloc in callee", | ||
| .insns = { | ||
| BPF_MOV64_REG(BPF_REG_6, BPF_REG_1), | ||
| BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 0), | ||
| BPF_MOV64_REG(BPF_REG_2, BPF_REG_10), | ||
| BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -8), | ||
| BPF_LD_MAP_FD(BPF_REG_1, 0), | ||
| BPF_EMIT_CALL(BPF_FUNC_map_lookup_elem), | ||
| BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 6), | ||
| BPF_MOV64_REG(BPF_REG_7, BPF_REG_0), | ||
| BPF_EMIT_CALL(BPF_FUNC_get_prandom_u32), | ||
| BPF_MOV64_REG(BPF_REG_1, BPF_REG_0), | ||
| BPF_MOV64_REG(BPF_REG_2, BPF_REG_0), | ||
| BPF_MOV64_REG(BPF_REG_3, BPF_REG_7), | ||
| BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 1), | ||
| BPF_EXIT_INSN(), | ||
| BPF_JMP_IMM(BPF_JSGT, BPF_REG_1, 20, 5), | ||
| BPF_JMP_IMM(BPF_JSLT, BPF_REG_2, 0, 4), | ||
| BPF_ALU64_REG(BPF_ADD, BPF_REG_3, BPF_REG_1), | ||
| BPF_ALU64_REG(BPF_ADD, BPF_REG_3, BPF_REG_2), | ||
| BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_3, 0), | ||
| BPF_EXIT_INSN(), | ||
| BPF_MOV64_IMM(BPF_REG_0, 0), | ||
| BPF_EXIT_INSN(), | ||
| }, | ||
| .fixup_map_hash_48b = { 4 }, | ||
| .result = ACCEPT, | ||
| .prog_type = BPF_PROG_TYPE_TRACEPOINT, | ||
| }, |