{ "BPF_ATOMIC XOR without fetch", .insns = { /* val = 0x110; */ BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 0x110), /* atomic_xor(&val, 0x011); */ BPF_MOV64_IMM(BPF_REG_1, 0x011), BPF_ATOMIC_OP(BPF_DW, BPF_XOR, BPF_REG_10, BPF_REG_1, -8), /* if (val != 0x101) exit(2); */ BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_10, -8), BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0x101, 2), BPF_MOV64_IMM(BPF_REG_0, 2), BPF_EXIT_INSN(), /* r1 should not be clobbered, no BPF_FETCH flag */ BPF_MOV64_IMM(BPF_REG_0, 0), BPF_JMP_IMM(BPF_JEQ, BPF_REG_1, 0x011, 1), BPF_MOV64_IMM(BPF_REG_0, 1), BPF_EXIT_INSN(), }, .result = ACCEPT, }, { "BPF_ATOMIC XOR with fetch", .insns = { BPF_MOV64_IMM(BPF_REG_0, 123), /* val = 0x110; */ BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 0x110), /* old = atomic_fetch_xor(&val, 0x011); */ BPF_MOV64_IMM(BPF_REG_1, 0x011), BPF_ATOMIC_OP(BPF_DW, BPF_XOR | BPF_FETCH, BPF_REG_10, BPF_REG_1, -8), /* if (old != 0x110) exit(3); */ BPF_JMP_IMM(BPF_JEQ, BPF_REG_1, 0x110, 2), BPF_MOV64_IMM(BPF_REG_0, 3), BPF_EXIT_INSN(), /* if (val != 0x101) exit(2); */ BPF_LDX_MEM(BPF_DW, BPF_REG_1, BPF_REG_10, -8), BPF_JMP_IMM(BPF_JEQ, BPF_REG_1, 0x101, 2), BPF_MOV64_IMM(BPF_REG_1, 2), BPF_EXIT_INSN(), /* Check R0 wasn't clobbered (fxor fear of x86 JIT bug) */ BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 123, 2), BPF_MOV64_IMM(BPF_REG_0, 1), BPF_EXIT_INSN(), /* exit(0); */ BPF_MOV64_IMM(BPF_REG_0, 0), BPF_EXIT_INSN(), }, .result = ACCEPT, }, { "BPF_ATOMIC XOR with fetch 32bit", .insns = { /* r0 = (s64) -1 */ BPF_MOV64_IMM(BPF_REG_0, 0), BPF_ALU64_IMM(BPF_SUB, BPF_REG_0, 1), /* val = 0x110; */ BPF_ST_MEM(BPF_W, BPF_REG_10, -4, 0x110), /* old = atomic_fetch_xor(&val, 0x011); */ BPF_MOV32_IMM(BPF_REG_1, 0x011), BPF_ATOMIC_OP(BPF_W, BPF_XOR | BPF_FETCH, BPF_REG_10, BPF_REG_1, -4), /* if (old != 0x110) exit(3); */ BPF_JMP32_IMM(BPF_JEQ, BPF_REG_1, 0x110, 2), BPF_MOV32_IMM(BPF_REG_0, 3), BPF_EXIT_INSN(), /* if (val != 0x101) exit(2); */ BPF_LDX_MEM(BPF_W, BPF_REG_1, BPF_REG_10, -4), BPF_JMP32_IMM(BPF_JEQ, BPF_REG_1, 0x101, 2), BPF_MOV32_IMM(BPF_REG_1, 2), BPF_EXIT_INSN(), /* Check R0 wasn't clobbered (fxor fear of x86 JIT bug) * It should be -1 so add 1 to get exit code. */ BPF_ALU64_IMM(BPF_ADD, BPF_REG_0, 1), BPF_EXIT_INSN(), }, .result = ACCEPT, },