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{
"BPF_ATOMIC OR without fetch",
.insns = {
/* val = 0x110; */
BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 0x110),
/* atomic_or(&val, 0x011); */
BPF_MOV64_IMM(BPF_REG_1, 0x011),
BPF_ATOMIC_OP(BPF_DW, BPF_OR, BPF_REG_10, BPF_REG_1, -8),
/* if (val != 0x111) exit(2); */
BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_10, -8),
BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0x111, 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 OR 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_or(&val, 0x011); */
BPF_MOV64_IMM(BPF_REG_1, 0x011),
BPF_ATOMIC_OP(BPF_DW, BPF_OR | 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 != 0x111) exit(2); */
BPF_LDX_MEM(BPF_DW, BPF_REG_1, BPF_REG_10, -8),
BPF_JMP_IMM(BPF_JEQ, BPF_REG_1, 0x111, 2),
BPF_MOV64_IMM(BPF_REG_1, 2),
BPF_EXIT_INSN(),
/* Check R0 wasn't clobbered (for 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 OR 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_or(&val, 0x011); */
BPF_MOV32_IMM(BPF_REG_1, 0x011),
BPF_ATOMIC_OP(BPF_W, BPF_OR | 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 != 0x111) exit(2); */
BPF_LDX_MEM(BPF_W, BPF_REG_1, BPF_REG_10, -4),
BPF_JMP32_IMM(BPF_JEQ, BPF_REG_1, 0x111, 2),
BPF_MOV32_IMM(BPF_REG_1, 2),
BPF_EXIT_INSN(),
/* Check R0 wasn't clobbered (for 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,
},
{
"BPF_W atomic_fetch_or should zero top 32 bits",
.insns = {
/* r1 = U64_MAX; */
BPF_MOV64_IMM(BPF_REG_1, 0),
BPF_ALU64_IMM(BPF_SUB, BPF_REG_1, 1),
/* u64 val = r1; */
BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_1, -8),
/* r1 = (u32)atomic_fetch_or((u32 *)&val, 2); */
BPF_MOV32_IMM(BPF_REG_1, 2),
BPF_ATOMIC_OP(BPF_W, BPF_OR | BPF_FETCH, BPF_REG_10, BPF_REG_1, -8),
/* r2 = 0x00000000FFFFFFFF; */
BPF_MOV64_IMM(BPF_REG_2, 1),
BPF_ALU64_IMM(BPF_LSH, BPF_REG_2, 32),
BPF_ALU64_IMM(BPF_SUB, BPF_REG_2, 1),
/* if (r2 != r1) exit(1); */
BPF_JMP_REG(BPF_JEQ, BPF_REG_2, BPF_REG_1, 2),
BPF_MOV64_REG(BPF_REG_0, BPF_REG_1),
BPF_EXIT_INSN(),
/* exit(0); */
BPF_MOV32_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
},
.result = ACCEPT,
},
|
