107 lines
3.2 KiB
C
107 lines
3.2 KiB
C
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{
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"BPF_ATOMIC_FETCH_ADD smoketest - 64bit",
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.insns = {
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BPF_MOV64_IMM(BPF_REG_0, 0),
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/* Write 3 to stack */
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BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 3),
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/* Put a 1 in R1, add it to the 3 on the stack, and load the value back into R1 */
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BPF_MOV64_IMM(BPF_REG_1, 1),
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BPF_ATOMIC_OP(BPF_DW, BPF_ADD | BPF_FETCH, BPF_REG_10, BPF_REG_1, -8),
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/* Check the value we loaded back was 3 */
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BPF_JMP_IMM(BPF_JEQ, BPF_REG_1, 3, 2),
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BPF_MOV64_IMM(BPF_REG_0, 1),
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BPF_EXIT_INSN(),
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/* Load value from stack */
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BPF_LDX_MEM(BPF_DW, BPF_REG_1, BPF_REG_10, -8),
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/* Check value loaded from stack was 4 */
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BPF_JMP_IMM(BPF_JEQ, BPF_REG_1, 4, 1),
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BPF_MOV64_IMM(BPF_REG_0, 2),
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BPF_EXIT_INSN(),
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},
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.result = ACCEPT,
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},
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{
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"BPF_ATOMIC_FETCH_ADD smoketest - 32bit",
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.insns = {
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BPF_MOV64_IMM(BPF_REG_0, 0),
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/* Write 3 to stack */
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BPF_ST_MEM(BPF_W, BPF_REG_10, -4, 3),
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/* Put a 1 in R1, add it to the 3 on the stack, and load the value back into R1 */
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BPF_MOV32_IMM(BPF_REG_1, 1),
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BPF_ATOMIC_OP(BPF_W, BPF_ADD | BPF_FETCH, BPF_REG_10, BPF_REG_1, -4),
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/* Check the value we loaded back was 3 */
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BPF_JMP_IMM(BPF_JEQ, BPF_REG_1, 3, 2),
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BPF_MOV64_IMM(BPF_REG_0, 1),
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BPF_EXIT_INSN(),
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/* Load value from stack */
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BPF_LDX_MEM(BPF_W, BPF_REG_1, BPF_REG_10, -4),
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/* Check value loaded from stack was 4 */
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BPF_JMP_IMM(BPF_JEQ, BPF_REG_1, 4, 1),
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BPF_MOV64_IMM(BPF_REG_0, 2),
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BPF_EXIT_INSN(),
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},
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.result = ACCEPT,
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},
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{
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"Can't use ATM_FETCH_ADD on frame pointer",
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.insns = {
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BPF_MOV64_IMM(BPF_REG_0, 0),
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BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 3),
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BPF_ATOMIC_OP(BPF_DW, BPF_ADD | BPF_FETCH, BPF_REG_10, BPF_REG_10, -8),
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BPF_EXIT_INSN(),
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},
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.result = REJECT,
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.errstr_unpriv = "R10 leaks addr into mem",
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.errstr = "frame pointer is read only",
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},
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{
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"Can't use ATM_FETCH_ADD on uninit src reg",
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.insns = {
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BPF_MOV64_IMM(BPF_REG_0, 0),
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BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 3),
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BPF_ATOMIC_OP(BPF_DW, BPF_ADD | BPF_FETCH, BPF_REG_10, BPF_REG_2, -8),
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BPF_EXIT_INSN(),
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},
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.result = REJECT,
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/* It happens that the address leak check is first, but it would also be
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* complain about the fact that we're trying to modify R10.
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*/
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.errstr = "!read_ok",
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},
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{
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"Can't use ATM_FETCH_ADD on uninit dst reg",
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.insns = {
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BPF_MOV64_IMM(BPF_REG_0, 0),
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BPF_ATOMIC_OP(BPF_DW, BPF_ADD | BPF_FETCH, BPF_REG_2, BPF_REG_0, -8),
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BPF_EXIT_INSN(),
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},
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.result = REJECT,
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/* It happens that the address leak check is first, but it would also be
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* complain about the fact that we're trying to modify R10.
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*/
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.errstr = "!read_ok",
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},
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{
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"Can't use ATM_FETCH_ADD on kernel memory",
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.insns = {
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/* This is an fentry prog, context is array of the args of the
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* kernel function being called. Load first arg into R2.
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*/
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BPF_LDX_MEM(BPF_DW, BPF_REG_2, BPF_REG_1, 0),
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/* First arg of bpf_fentry_test7 is a pointer to a struct.
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* Attempt to modify that struct. Verifier shouldn't let us
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* because it's kernel memory.
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*/
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BPF_MOV64_IMM(BPF_REG_3, 1),
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BPF_ATOMIC_OP(BPF_DW, BPF_ADD | BPF_FETCH, BPF_REG_2, BPF_REG_3, 0),
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/* Done */
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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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.prog_type = BPF_PROG_TYPE_TRACING,
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.expected_attach_type = BPF_TRACE_FENTRY,
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.kfunc = "bpf_fentry_test7",
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.result = REJECT,
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.errstr = "only read is supported",
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},
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