448 lines
14 KiB
C
448 lines
14 KiB
C
{
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"spin_lock: test1 success",
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.insns = {
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BPF_ST_MEM(BPF_W, BPF_REG_10, -4, 0),
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BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
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BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -4),
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BPF_LD_MAP_FD(BPF_REG_1,
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0),
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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_MOV64_REG(BPF_REG_6, BPF_REG_0),
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BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
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BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 4),
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BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_spin_lock),
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BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),
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BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 4),
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BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_6, 0),
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BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_spin_unlock),
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BPF_MOV64_IMM(BPF_REG_0, 0),
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BPF_EXIT_INSN(),
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},
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.fixup_map_spin_lock = { 3 },
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.result = ACCEPT,
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.result_unpriv = REJECT,
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.errstr_unpriv = "",
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.prog_type = BPF_PROG_TYPE_CGROUP_SKB,
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},
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{
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"spin_lock: test2 direct ld/st",
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.insns = {
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BPF_ST_MEM(BPF_W, BPF_REG_10, -4, 0),
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BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
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BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -4),
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BPF_LD_MAP_FD(BPF_REG_1,
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0),
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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_MOV64_REG(BPF_REG_6, BPF_REG_0),
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BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
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BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 4),
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BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_spin_lock),
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BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),
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BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 4),
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BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_1, 0),
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BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_spin_unlock),
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BPF_MOV64_IMM(BPF_REG_0, 0),
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BPF_EXIT_INSN(),
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},
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.fixup_map_spin_lock = { 3 },
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.result = REJECT,
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.errstr = "cannot be accessed directly",
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.result_unpriv = REJECT,
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.errstr_unpriv = "",
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.prog_type = BPF_PROG_TYPE_CGROUP_SKB,
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},
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{
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"spin_lock: test3 direct ld/st",
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.insns = {
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BPF_ST_MEM(BPF_W, BPF_REG_10, -4, 0),
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BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
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BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -4),
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BPF_LD_MAP_FD(BPF_REG_1,
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0),
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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_MOV64_REG(BPF_REG_6, BPF_REG_0),
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BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
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BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 4),
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BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_spin_lock),
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BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),
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BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 4),
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BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_6, 1),
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BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_spin_unlock),
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BPF_MOV64_IMM(BPF_REG_0, 0),
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BPF_EXIT_INSN(),
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},
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.fixup_map_spin_lock = { 3 },
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.result = REJECT,
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.errstr = "cannot be accessed directly",
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.result_unpriv = REJECT,
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.errstr_unpriv = "",
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.prog_type = BPF_PROG_TYPE_CGROUP_SKB,
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.flags = F_NEEDS_EFFICIENT_UNALIGNED_ACCESS,
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},
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{
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"spin_lock: test4 direct ld/st",
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.insns = {
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BPF_ST_MEM(BPF_W, BPF_REG_10, -4, 0),
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BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
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BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -4),
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BPF_LD_MAP_FD(BPF_REG_1,
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0),
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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_MOV64_REG(BPF_REG_6, BPF_REG_0),
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BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
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BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 4),
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BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_spin_lock),
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BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),
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BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 4),
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BPF_LDX_MEM(BPF_H, BPF_REG_0, BPF_REG_6, 3),
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BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_spin_unlock),
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BPF_MOV64_IMM(BPF_REG_0, 0),
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BPF_EXIT_INSN(),
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},
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.fixup_map_spin_lock = { 3 },
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.result = REJECT,
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.errstr = "cannot be accessed directly",
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.result_unpriv = REJECT,
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.errstr_unpriv = "",
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.prog_type = BPF_PROG_TYPE_CGROUP_SKB,
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.flags = F_NEEDS_EFFICIENT_UNALIGNED_ACCESS,
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},
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{
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"spin_lock: test5 call within a locked region",
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.insns = {
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BPF_ST_MEM(BPF_W, BPF_REG_10, -4, 0),
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BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
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BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -4),
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BPF_LD_MAP_FD(BPF_REG_1,
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0),
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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_MOV64_REG(BPF_REG_6, BPF_REG_0),
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BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
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BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 4),
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BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_spin_lock),
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BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_get_prandom_u32),
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BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),
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BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 4),
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BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_spin_unlock),
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BPF_MOV64_IMM(BPF_REG_0, 0),
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BPF_EXIT_INSN(),
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},
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.fixup_map_spin_lock = { 3 },
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.result = REJECT,
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.errstr = "calls are not allowed",
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.result_unpriv = REJECT,
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.errstr_unpriv = "",
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.prog_type = BPF_PROG_TYPE_CGROUP_SKB,
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},
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{
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"spin_lock: test6 missing unlock",
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.insns = {
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BPF_ST_MEM(BPF_W, BPF_REG_10, -4, 0),
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BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
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BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -4),
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BPF_LD_MAP_FD(BPF_REG_1,
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0),
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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_MOV64_REG(BPF_REG_6, BPF_REG_0),
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BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
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BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 4),
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BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_spin_lock),
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BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),
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BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 4),
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BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_6, 0),
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BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 1),
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BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_spin_unlock),
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BPF_MOV64_IMM(BPF_REG_0, 0),
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BPF_EXIT_INSN(),
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},
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.fixup_map_spin_lock = { 3 },
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.result = REJECT,
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.errstr = "unlock is missing",
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.result_unpriv = REJECT,
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.errstr_unpriv = "",
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.prog_type = BPF_PROG_TYPE_CGROUP_SKB,
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},
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{
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"spin_lock: test7 unlock without lock",
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.insns = {
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BPF_ST_MEM(BPF_W, BPF_REG_10, -4, 0),
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BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
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BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -4),
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BPF_LD_MAP_FD(BPF_REG_1,
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0),
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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_MOV64_REG(BPF_REG_6, BPF_REG_0),
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BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
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BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 4),
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BPF_JMP_IMM(BPF_JNE, BPF_REG_1, 0, 1),
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BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_spin_lock),
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BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),
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BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 4),
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BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_6, 0),
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BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_spin_unlock),
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BPF_MOV64_IMM(BPF_REG_0, 0),
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BPF_EXIT_INSN(),
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},
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.fixup_map_spin_lock = { 3 },
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.result = REJECT,
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.errstr = "without taking a lock",
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.result_unpriv = REJECT,
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.errstr_unpriv = "",
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.prog_type = BPF_PROG_TYPE_CGROUP_SKB,
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},
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{
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"spin_lock: test8 double lock",
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.insns = {
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BPF_ST_MEM(BPF_W, BPF_REG_10, -4, 0),
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BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
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BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -4),
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BPF_LD_MAP_FD(BPF_REG_1,
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0),
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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_MOV64_REG(BPF_REG_6, BPF_REG_0),
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BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
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BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 4),
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BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_spin_lock),
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BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),
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BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 4),
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BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_spin_lock),
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BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),
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BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 4),
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BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_6, 0),
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BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_spin_unlock),
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BPF_MOV64_IMM(BPF_REG_0, 0),
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BPF_EXIT_INSN(),
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},
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.fixup_map_spin_lock = { 3 },
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.result = REJECT,
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.errstr = "calls are not allowed",
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.result_unpriv = REJECT,
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.errstr_unpriv = "",
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.prog_type = BPF_PROG_TYPE_CGROUP_SKB,
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},
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{
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"spin_lock: test9 different lock",
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.insns = {
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BPF_ST_MEM(BPF_W, BPF_REG_10, -4, 0),
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BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
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BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -4),
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BPF_LD_MAP_FD(BPF_REG_1,
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0),
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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_MOV64_REG(BPF_REG_6, BPF_REG_0),
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BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
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BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -4),
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BPF_LD_MAP_FD(BPF_REG_1,
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0),
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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_MOV64_REG(BPF_REG_7, BPF_REG_0),
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BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),
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BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 4),
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BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_spin_lock),
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BPF_MOV64_REG(BPF_REG_1, BPF_REG_7),
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BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 4),
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BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_spin_unlock),
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BPF_MOV64_IMM(BPF_REG_0, 0),
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BPF_EXIT_INSN(),
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},
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.fixup_map_spin_lock = { 3, 11 },
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.result = REJECT,
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.errstr = "unlock of different lock",
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.result_unpriv = REJECT,
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.errstr_unpriv = "",
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.prog_type = BPF_PROG_TYPE_CGROUP_SKB,
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},
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{
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"spin_lock: test10 lock in subprog without unlock",
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.insns = {
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BPF_ST_MEM(BPF_W, BPF_REG_10, -4, 0),
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BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
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BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -4),
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BPF_LD_MAP_FD(BPF_REG_1,
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0),
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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_MOV64_REG(BPF_REG_6, BPF_REG_0),
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BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
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BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 4),
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BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 5),
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BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),
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BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 4),
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BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_spin_unlock),
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BPF_MOV64_IMM(BPF_REG_0, 1),
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BPF_EXIT_INSN(),
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BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_spin_lock),
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BPF_MOV64_IMM(BPF_REG_0, 0),
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BPF_EXIT_INSN(),
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},
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.fixup_map_spin_lock = { 3 },
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.result = REJECT,
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.errstr = "unlock is missing",
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.result_unpriv = REJECT,
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.errstr_unpriv = "",
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.prog_type = BPF_PROG_TYPE_CGROUP_SKB,
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},
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{
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"spin_lock: test11 ld_abs under lock",
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.insns = {
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BPF_MOV64_REG(BPF_REG_6, BPF_REG_1),
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BPF_ST_MEM(BPF_W, BPF_REG_10, -4, 0),
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BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
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BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -4),
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BPF_LD_MAP_FD(BPF_REG_1,
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0),
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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_MOV64_REG(BPF_REG_7, BPF_REG_0),
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BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
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BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 4),
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BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_spin_lock),
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BPF_LD_ABS(BPF_B, 0),
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BPF_MOV64_REG(BPF_REG_1, BPF_REG_7),
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BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 4),
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BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_spin_unlock),
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BPF_MOV64_IMM(BPF_REG_0, 0),
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BPF_EXIT_INSN(),
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},
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.fixup_map_spin_lock = { 4 },
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.result = REJECT,
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.errstr = "inside bpf_spin_lock",
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.prog_type = BPF_PROG_TYPE_SCHED_CLS,
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},
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{
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"spin_lock: regsafe compare reg->id for map value",
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.insns = {
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BPF_MOV64_REG(BPF_REG_6, BPF_REG_1),
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BPF_LDX_MEM(BPF_W, BPF_REG_6, BPF_REG_6, offsetof(struct __sk_buff, mark)),
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BPF_LD_MAP_FD(BPF_REG_1, 0),
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BPF_MOV64_REG(BPF_REG_9, BPF_REG_1),
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BPF_ST_MEM(BPF_W, BPF_REG_10, -4, 0),
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BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
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|
BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -4),
|
|
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_map_lookup_elem),
|
|
BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 1),
|
|
BPF_EXIT_INSN(),
|
|
BPF_MOV64_REG(BPF_REG_7, BPF_REG_0),
|
|
BPF_MOV64_REG(BPF_REG_1, BPF_REG_9),
|
|
BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
|
|
BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -4),
|
|
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_map_lookup_elem),
|
|
BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 1),
|
|
BPF_EXIT_INSN(),
|
|
BPF_MOV64_REG(BPF_REG_8, BPF_REG_0),
|
|
BPF_MOV64_REG(BPF_REG_1, BPF_REG_7),
|
|
BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 4),
|
|
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_spin_lock),
|
|
BPF_JMP_IMM(BPF_JEQ, BPF_REG_6, 0, 1),
|
|
BPF_JMP_IMM(BPF_JA, 0, 0, 1),
|
|
BPF_MOV64_REG(BPF_REG_7, BPF_REG_8),
|
|
BPF_MOV64_REG(BPF_REG_1, BPF_REG_7),
|
|
BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 4),
|
|
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_spin_unlock),
|
|
BPF_MOV64_IMM(BPF_REG_0, 0),
|
|
BPF_EXIT_INSN(),
|
|
},
|
|
.fixup_map_spin_lock = { 2 },
|
|
.result = REJECT,
|
|
.errstr = "bpf_spin_unlock of different lock",
|
|
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
|
|
.flags = BPF_F_TEST_STATE_FREQ,
|
|
},
|
|
/* Make sure that regsafe() compares ids for spin lock records using
|
|
* check_ids():
|
|
* 1: r9 = map_lookup_elem(...) ; r9.id == 1
|
|
* 2: r8 = map_lookup_elem(...) ; r8.id == 2
|
|
* 3: r7 = ktime_get_ns()
|
|
* 4: r6 = ktime_get_ns()
|
|
* 5: if r6 > r7 goto <9>
|
|
* 6: spin_lock(r8)
|
|
* 7: r9 = r8
|
|
* 8: goto <10>
|
|
* 9: spin_lock(r9)
|
|
* 10: spin_unlock(r9) ; r9.id == 1 || r9.id == 2 and lock is active,
|
|
* ; second visit to (10) should be considered safe
|
|
* ; if check_ids() is used.
|
|
* 11: exit(0)
|
|
*/
|
|
{
|
|
"spin_lock: regsafe() check_ids() similar id mappings",
|
|
.insns = {
|
|
BPF_ST_MEM(BPF_W, BPF_REG_10, -4, 0),
|
|
/* r9 = map_lookup_elem(...) */
|
|
BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
|
|
BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -4),
|
|
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, 24),
|
|
BPF_MOV64_REG(BPF_REG_9, BPF_REG_0),
|
|
/* r8 = map_lookup_elem(...) */
|
|
BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
|
|
BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -4),
|
|
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, 18),
|
|
BPF_MOV64_REG(BPF_REG_8, BPF_REG_0),
|
|
/* r7 = ktime_get_ns() */
|
|
BPF_EMIT_CALL(BPF_FUNC_ktime_get_ns),
|
|
BPF_MOV64_REG(BPF_REG_7, BPF_REG_0),
|
|
/* r6 = ktime_get_ns() */
|
|
BPF_EMIT_CALL(BPF_FUNC_ktime_get_ns),
|
|
BPF_MOV64_REG(BPF_REG_6, BPF_REG_0),
|
|
/* if r6 > r7 goto +5 ; no new information about the state is derived from
|
|
* ; this check, thus produced verifier states differ
|
|
* ; only in 'insn_idx'
|
|
* spin_lock(r8)
|
|
* r9 = r8
|
|
* goto unlock
|
|
*/
|
|
BPF_JMP_REG(BPF_JGT, BPF_REG_6, BPF_REG_7, 5),
|
|
BPF_MOV64_REG(BPF_REG_1, BPF_REG_8),
|
|
BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 4),
|
|
BPF_EMIT_CALL(BPF_FUNC_spin_lock),
|
|
BPF_MOV64_REG(BPF_REG_9, BPF_REG_8),
|
|
BPF_JMP_A(3),
|
|
/* spin_lock(r9) */
|
|
BPF_MOV64_REG(BPF_REG_1, BPF_REG_9),
|
|
BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 4),
|
|
BPF_EMIT_CALL(BPF_FUNC_spin_lock),
|
|
/* spin_unlock(r9) */
|
|
BPF_MOV64_REG(BPF_REG_1, BPF_REG_9),
|
|
BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 4),
|
|
BPF_EMIT_CALL(BPF_FUNC_spin_unlock),
|
|
/* exit(0) */
|
|
BPF_MOV64_IMM(BPF_REG_0, 0),
|
|
BPF_EXIT_INSN(),
|
|
},
|
|
.fixup_map_spin_lock = { 3, 10 },
|
|
.result = VERBOSE_ACCEPT,
|
|
.errstr = "28: safe",
|
|
.result_unpriv = REJECT,
|
|
.errstr_unpriv = "",
|
|
.prog_type = BPF_PROG_TYPE_CGROUP_SKB,
|
|
.flags = BPF_F_TEST_STATE_FREQ,
|
|
},
|