| { |
| "check valid spill/fill", |
| .insns = { |
| /* spill R1(ctx) into stack */ |
| BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_1, -8), |
| /* fill it back into R2 */ |
| BPF_LDX_MEM(BPF_DW, BPF_REG_2, BPF_REG_10, -8), |
| /* should be able to access R0 = *(R2 + 8) */ |
| /* BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_2, 8), */ |
| BPF_MOV64_REG(BPF_REG_0, BPF_REG_2), |
| BPF_EXIT_INSN(), |
| }, |
| .errstr_unpriv = "R0 leaks addr", |
| .result = ACCEPT, |
| .result_unpriv = REJECT, |
| .retval = POINTER_VALUE, |
| }, |
| { |
| "check valid spill/fill, skb mark", |
| .insns = { |
| BPF_ALU64_REG(BPF_MOV, BPF_REG_6, BPF_REG_1), |
| BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_6, -8), |
| BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_10, -8), |
| BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_0, |
| offsetof(struct __sk_buff, mark)), |
| BPF_EXIT_INSN(), |
| }, |
| .result = ACCEPT, |
| .result_unpriv = ACCEPT, |
| }, |
| { |
| "check valid spill/fill, ptr to mem", |
| .insns = { |
| /* reserve 8 byte ringbuf memory */ |
| BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 0), |
| BPF_LD_MAP_FD(BPF_REG_1, 0), |
| BPF_MOV64_IMM(BPF_REG_2, 8), |
| BPF_MOV64_IMM(BPF_REG_3, 0), |
| BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_ringbuf_reserve), |
| /* store a pointer to the reserved memory in R6 */ |
| BPF_MOV64_REG(BPF_REG_6, BPF_REG_0), |
| /* check whether the reservation was successful */ |
| BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 6), |
| /* spill R6(mem) into the stack */ |
| BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_6, -8), |
| /* fill it back in R7 */ |
| BPF_LDX_MEM(BPF_DW, BPF_REG_7, BPF_REG_10, -8), |
| /* should be able to access *(R7) = 0 */ |
| BPF_ST_MEM(BPF_DW, BPF_REG_7, 0, 0), |
| /* submit the reserved ringbuf memory */ |
| BPF_MOV64_REG(BPF_REG_1, BPF_REG_7), |
| BPF_MOV64_IMM(BPF_REG_2, 0), |
| BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_ringbuf_submit), |
| BPF_MOV64_IMM(BPF_REG_0, 0), |
| BPF_EXIT_INSN(), |
| }, |
| .fixup_map_ringbuf = { 1 }, |
| .result = ACCEPT, |
| .result_unpriv = ACCEPT, |
| }, |
| { |
| "check corrupted spill/fill", |
| .insns = { |
| /* spill R1(ctx) into stack */ |
| BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_1, -8), |
| /* mess up with R1 pointer on stack */ |
| BPF_ST_MEM(BPF_B, BPF_REG_10, -7, 0x23), |
| /* fill back into R0 is fine for priv. |
| * R0 now becomes SCALAR_VALUE. |
| */ |
| BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_10, -8), |
| /* Load from R0 should fail. */ |
| BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_0, 8), |
| BPF_EXIT_INSN(), |
| }, |
| .errstr_unpriv = "attempt to corrupt spilled", |
| .errstr = "R0 invalid mem access 'inv", |
| .result = REJECT, |
| .flags = F_NEEDS_EFFICIENT_UNALIGNED_ACCESS, |
| }, |
| { |
| "check corrupted spill/fill, LSB", |
| .insns = { |
| BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_1, -8), |
| BPF_ST_MEM(BPF_H, BPF_REG_10, -8, 0xcafe), |
| BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_10, -8), |
| BPF_EXIT_INSN(), |
| }, |
| .errstr_unpriv = "attempt to corrupt spilled", |
| .result_unpriv = REJECT, |
| .result = ACCEPT, |
| .retval = POINTER_VALUE, |
| }, |
| { |
| "check corrupted spill/fill, MSB", |
| .insns = { |
| BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_1, -8), |
| BPF_ST_MEM(BPF_W, BPF_REG_10, -4, 0x12345678), |
| BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_10, -8), |
| BPF_EXIT_INSN(), |
| }, |
| .errstr_unpriv = "attempt to corrupt spilled", |
| .result_unpriv = REJECT, |
| .result = ACCEPT, |
| .retval = POINTER_VALUE, |
| }, |
