346 lines
11 KiB
C
346 lines
11 KiB
C
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{
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"check valid spill/fill",
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.insns = {
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/* spill R1(ctx) into stack */
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BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_1, -8),
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/* fill it back into R2 */
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BPF_LDX_MEM(BPF_DW, BPF_REG_2, BPF_REG_10, -8),
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/* should be able to access R0 = *(R2 + 8) */
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/* BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_2, 8), */
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BPF_MOV64_REG(BPF_REG_0, BPF_REG_2),
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BPF_EXIT_INSN(),
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},
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.errstr_unpriv = "R0 leaks addr",
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.result = ACCEPT,
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.result_unpriv = REJECT,
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.retval = POINTER_VALUE,
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},
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{
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"check valid spill/fill, skb mark",
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.insns = {
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BPF_ALU64_REG(BPF_MOV, BPF_REG_6, BPF_REG_1),
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BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_6, -8),
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BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_10, -8),
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BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_0,
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offsetof(struct __sk_buff, mark)),
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BPF_EXIT_INSN(),
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},
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.result = ACCEPT,
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.result_unpriv = ACCEPT,
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},
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{
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"check valid spill/fill, ptr to mem",
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.insns = {
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/* reserve 8 byte ringbuf memory */
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BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 0),
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BPF_LD_MAP_FD(BPF_REG_1, 0),
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BPF_MOV64_IMM(BPF_REG_2, 8),
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BPF_MOV64_IMM(BPF_REG_3, 0),
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BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_ringbuf_reserve),
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/* store a pointer to the reserved memory in R6 */
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BPF_MOV64_REG(BPF_REG_6, BPF_REG_0),
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/* check whether the reservation was successful */
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BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 6),
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/* spill R6(mem) into the stack */
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BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_6, -8),
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/* fill it back in R7 */
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BPF_LDX_MEM(BPF_DW, BPF_REG_7, BPF_REG_10, -8),
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/* should be able to access *(R7) = 0 */
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BPF_ST_MEM(BPF_DW, BPF_REG_7, 0, 0),
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/* submit the reserved ringbuf memory */
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BPF_MOV64_REG(BPF_REG_1, BPF_REG_7),
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BPF_MOV64_IMM(BPF_REG_2, 0),
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BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_ringbuf_submit),
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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_ringbuf = { 1 },
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.result = ACCEPT,
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.result_unpriv = ACCEPT,
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},
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{
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"check with invalid reg offset 0",
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.insns = {
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/* reserve 8 byte ringbuf memory */
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BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 0),
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BPF_LD_MAP_FD(BPF_REG_1, 0),
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BPF_MOV64_IMM(BPF_REG_2, 8),
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BPF_MOV64_IMM(BPF_REG_3, 0),
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BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_ringbuf_reserve),
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/* store a pointer to the reserved memory in R6 */
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BPF_MOV64_REG(BPF_REG_6, BPF_REG_0),
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/* add invalid offset to memory or NULL */
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BPF_ALU64_IMM(BPF_ADD, BPF_REG_0, 1),
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/* check whether the reservation was successful */
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BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 4),
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/* should not be able to access *(R7) = 0 */
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BPF_ST_MEM(BPF_W, BPF_REG_6, 0, 0),
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/* submit the reserved ringbuf memory */
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BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),
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BPF_MOV64_IMM(BPF_REG_2, 0),
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BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_ringbuf_submit),
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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_ringbuf = { 1 },
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.result = REJECT,
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.errstr = "R0 pointer arithmetic on ringbuf_mem_or_null prohibited",
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},
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{
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"check corrupted spill/fill",
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.insns = {
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/* spill R1(ctx) into stack */
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BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_1, -8),
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/* mess up with R1 pointer on stack */
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BPF_ST_MEM(BPF_B, BPF_REG_10, -7, 0x23),
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/* fill back into R0 is fine for priv.
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* R0 now becomes SCALAR_VALUE.
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*/
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BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_10, -8),
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/* Load from R0 should fail. */
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BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_0, 8),
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BPF_EXIT_INSN(),
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},
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.errstr_unpriv = "attempt to corrupt spilled",
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.errstr = "R0 invalid mem access 'scalar'",
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.result = REJECT,
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.flags = F_NEEDS_EFFICIENT_UNALIGNED_ACCESS,
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},
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{
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"check corrupted spill/fill, LSB",
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.insns = {
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BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_1, -8),
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BPF_ST_MEM(BPF_H, BPF_REG_10, -8, 0xcafe),
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BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_10, -8),
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BPF_EXIT_INSN(),
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},
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.errstr_unpriv = "attempt to corrupt spilled",
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.result_unpriv = REJECT,
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.result = ACCEPT,
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.retval = POINTER_VALUE,
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},
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{
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"check corrupted spill/fill, MSB",
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.insns = {
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BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_1, -8),
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BPF_ST_MEM(BPF_W, BPF_REG_10, -4, 0x12345678),
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BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_10, -8),
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BPF_EXIT_INSN(),
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},
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.errstr_unpriv = "attempt to corrupt spilled",
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.result_unpriv = REJECT,
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.result = ACCEPT,
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.retval = POINTER_VALUE,
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},
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{
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"Spill and refill a u32 const scalar. Offset to skb->data",
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.insns = {
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BPF_LDX_MEM(BPF_W, BPF_REG_2, BPF_REG_1,
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offsetof(struct __sk_buff, data)),
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BPF_LDX_MEM(BPF_W, BPF_REG_3, BPF_REG_1,
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offsetof(struct __sk_buff, data_end)),
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/* r4 = 20 */
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BPF_MOV32_IMM(BPF_REG_4, 20),
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/* *(u32 *)(r10 -8) = r4 */
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BPF_STX_MEM(BPF_W, BPF_REG_10, BPF_REG_4, -8),
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/* r4 = *(u32 *)(r10 -8) */
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BPF_LDX_MEM(BPF_W, BPF_REG_4, BPF_REG_10, -8),
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/* r0 = r2 */
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BPF_MOV64_REG(BPF_REG_0, BPF_REG_2),
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/* r0 += r4 R0=pkt R2=pkt R3=pkt_end R4=20 */
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BPF_ALU64_REG(BPF_ADD, BPF_REG_0, BPF_REG_4),
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/* if (r0 > r3) R0=pkt,off=20 R2=pkt R3=pkt_end R4=20 */
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BPF_JMP_REG(BPF_JGT, BPF_REG_0, BPF_REG_3, 1),
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/* r0 = *(u32 *)r2 R0=pkt,off=20,r=20 R2=pkt,r=20 R3=pkt_end R4=20 */
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BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_2, 0),
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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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.result = ACCEPT,
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.prog_type = BPF_PROG_TYPE_SCHED_CLS,
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},
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{
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"Spill a u32 const, refill from another half of the uninit u32 from the stack",
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.insns = {
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/* r4 = 20 */
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BPF_MOV32_IMM(BPF_REG_4, 20),
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/* *(u32 *)(r10 -8) = r4 */
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BPF_STX_MEM(BPF_W, BPF_REG_10, BPF_REG_4, -8),
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/* r4 = *(u32 *)(r10 -4) fp-8=????rrrr*/
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BPF_LDX_MEM(BPF_W, BPF_REG_4, BPF_REG_10, -4),
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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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.result_unpriv = REJECT,
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.errstr_unpriv = "invalid read from stack off -4+0 size 4",
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/* in privileged mode reads from uninitialized stack locations are permitted */
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.result = ACCEPT,
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},
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{
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"Spill a u32 const scalar. Refill as u16. Offset to skb->data",
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.insns = {
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BPF_LDX_MEM(BPF_W, BPF_REG_2, BPF_REG_1,
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offsetof(struct __sk_buff, data)),
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BPF_LDX_MEM(BPF_W, BPF_REG_3, BPF_REG_1,
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offsetof(struct __sk_buff, data_end)),
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/* r4 = 20 */
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BPF_MOV32_IMM(BPF_REG_4, 20),
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/* *(u32 *)(r10 -8) = r4 */
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BPF_STX_MEM(BPF_W, BPF_REG_10, BPF_REG_4, -8),
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/* r4 = *(u16 *)(r10 -8) */
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BPF_LDX_MEM(BPF_H, BPF_REG_4, BPF_REG_10, -8),
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/* r0 = r2 */
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BPF_MOV64_REG(BPF_REG_0, BPF_REG_2),
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/* r0 += r4 R0=pkt R2=pkt R3=pkt_end R4=umax=65535 */
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BPF_ALU64_REG(BPF_ADD, BPF_REG_0, BPF_REG_4),
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/* if (r0 > r3) R0=pkt,umax=65535 R2=pkt R3=pkt_end R4=umax=65535 */
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BPF_JMP_REG(BPF_JGT, BPF_REG_0, BPF_REG_3, 1),
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/* r0 = *(u32 *)r2 R0=pkt,umax=65535 R2=pkt R3=pkt_end R4=20 */
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BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_2, 0),
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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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.result = REJECT,
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.errstr = "invalid access to packet",
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.prog_type = BPF_PROG_TYPE_SCHED_CLS,
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},
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{
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"Spill u32 const scalars. Refill as u64. Offset to skb->data",
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.insns = {
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BPF_LDX_MEM(BPF_W, BPF_REG_2, BPF_REG_1,
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offsetof(struct __sk_buff, data)),
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BPF_LDX_MEM(BPF_W, BPF_REG_3, BPF_REG_1,
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offsetof(struct __sk_buff, data_end)),
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/* r6 = 0 */
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BPF_MOV32_IMM(BPF_REG_6, 0),
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/* r7 = 20 */
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BPF_MOV32_IMM(BPF_REG_7, 20),
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/* *(u32 *)(r10 -4) = r6 */
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BPF_STX_MEM(BPF_W, BPF_REG_10, BPF_REG_6, -4),
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/* *(u32 *)(r10 -8) = r7 */
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BPF_STX_MEM(BPF_W, BPF_REG_10, BPF_REG_7, -8),
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/* r4 = *(u64 *)(r10 -8) */
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BPF_LDX_MEM(BPF_H, BPF_REG_4, BPF_REG_10, -8),
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/* r0 = r2 */
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BPF_MOV64_REG(BPF_REG_0, BPF_REG_2),
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/* r0 += r4 R0=pkt R2=pkt R3=pkt_end R4=umax=65535 */
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BPF_ALU64_REG(BPF_ADD, BPF_REG_0, BPF_REG_4),
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/* if (r0 > r3) R0=pkt,umax=65535 R2=pkt R3=pkt_end R4=umax=65535 */
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BPF_JMP_REG(BPF_JGT, BPF_REG_0, BPF_REG_3, 1),
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/* r0 = *(u32 *)r2 R0=pkt,umax=65535 R2=pkt R3=pkt_end R4=20 */
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BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_2, 0),
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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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.result = REJECT,
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.errstr = "invalid access to packet",
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.prog_type = BPF_PROG_TYPE_SCHED_CLS,
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},
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{
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"Spill a u32 const scalar. Refill as u16 from fp-6. Offset to skb->data",
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.insns = {
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BPF_LDX_MEM(BPF_W, BPF_REG_2, BPF_REG_1,
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offsetof(struct __sk_buff, data)),
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BPF_LDX_MEM(BPF_W, BPF_REG_3, BPF_REG_1,
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offsetof(struct __sk_buff, data_end)),
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/* r4 = 20 */
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BPF_MOV32_IMM(BPF_REG_4, 20),
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/* *(u32 *)(r10 -8) = r4 */
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BPF_STX_MEM(BPF_W, BPF_REG_10, BPF_REG_4, -8),
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/* r4 = *(u16 *)(r10 -6) */
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BPF_LDX_MEM(BPF_H, BPF_REG_4, BPF_REG_10, -6),
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/* r0 = r2 */
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BPF_MOV64_REG(BPF_REG_0, BPF_REG_2),
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/* r0 += r4 R0=pkt R2=pkt R3=pkt_end R4=umax=65535 */
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BPF_ALU64_REG(BPF_ADD, BPF_REG_0, BPF_REG_4),
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/* if (r0 > r3) R0=pkt,umax=65535 R2=pkt R3=pkt_end R4=umax=65535 */
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BPF_JMP_REG(BPF_JGT, BPF_REG_0, BPF_REG_3, 1),
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/* r0 = *(u32 *)r2 R0=pkt,umax=65535 R2=pkt R3=pkt_end R4=20 */
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BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_2, 0),
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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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.result = REJECT,
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.errstr = "invalid access to packet",
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.prog_type = BPF_PROG_TYPE_SCHED_CLS,
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},
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{
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"Spill and refill a u32 const scalar at non 8byte aligned stack addr. Offset to skb->data",
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.insns = {
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BPF_LDX_MEM(BPF_W, BPF_REG_2, BPF_REG_1,
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offsetof(struct __sk_buff, data)),
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BPF_LDX_MEM(BPF_W, BPF_REG_3, BPF_REG_1,
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offsetof(struct __sk_buff, data_end)),
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/* r4 = 20 */
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BPF_MOV32_IMM(BPF_REG_4, 20),
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/* *(u32 *)(r10 -8) = r4 */
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BPF_STX_MEM(BPF_W, BPF_REG_10, BPF_REG_4, -8),
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/* *(u32 *)(r10 -4) = r4 */
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BPF_STX_MEM(BPF_W, BPF_REG_10, BPF_REG_4, -4),
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/* r4 = *(u32 *)(r10 -4), */
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BPF_LDX_MEM(BPF_W, BPF_REG_4, BPF_REG_10, -4),
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/* r0 = r2 */
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BPF_MOV64_REG(BPF_REG_0, BPF_REG_2),
|
||
|
|
/* r0 += r4 R0=pkt R2=pkt R3=pkt_end R4=umax=U32_MAX */
|
||
|
|
BPF_ALU64_REG(BPF_ADD, BPF_REG_0, BPF_REG_4),
|
||
|
|
/* if (r0 > r3) R0=pkt,umax=U32_MAX R2=pkt R3=pkt_end R4= */
|
||
|
|
BPF_JMP_REG(BPF_JGT, BPF_REG_0, BPF_REG_3, 1),
|
||
|
|
/* r0 = *(u32 *)r2 R0=pkt,umax=U32_MAX R2=pkt R3=pkt_end R4= */
|
||
|
|
BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_2, 0),
|
||
|
|
BPF_MOV64_IMM(BPF_REG_0, 0),
|
||
|
|
BPF_EXIT_INSN(),
|
||
|
|
},
|
||
|
|
.result = REJECT,
|
||
|
|
.errstr = "invalid access to packet",
|
||
|
|
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
|
||
|
|
},
|
||
|
|
{
|
||
|
|
"Spill and refill a umax=40 bounded scalar. Offset to skb->data",
|
||
|
|
.insns = {
|
||
|
|
BPF_LDX_MEM(BPF_W, BPF_REG_2, BPF_REG_1,
|
||
|
|
offsetof(struct __sk_buff, data)),
|
||
|
|
BPF_LDX_MEM(BPF_W, BPF_REG_3, BPF_REG_1,
|
||
|
|
offsetof(struct __sk_buff, data_end)),
|
||
|
|
BPF_LDX_MEM(BPF_DW, BPF_REG_4, BPF_REG_1,
|
||
|
|
offsetof(struct __sk_buff, tstamp)),
|
||
|
|
BPF_JMP_IMM(BPF_JLE, BPF_REG_4, 40, 2),
|
||
|
|
BPF_MOV64_IMM(BPF_REG_0, 0),
|
||
|
|
BPF_EXIT_INSN(),
|
||
|
|
/* *(u32 *)(r10 -8) = r4 R4=umax=40 */
|
||
|
|
BPF_STX_MEM(BPF_W, BPF_REG_10, BPF_REG_4, -8),
|
||
|
|
/* r4 = (*u32 *)(r10 - 8) */
|
||
|
|
BPF_LDX_MEM(BPF_W, BPF_REG_4, BPF_REG_10, -8),
|
||
|
|
/* r2 += r4 R2=pkt R4=umax=40 */
|
||
|
|
BPF_ALU64_REG(BPF_ADD, BPF_REG_2, BPF_REG_4),
|
||
|
|
/* r0 = r2 R2=pkt,umax=40 R4=umax=40 */
|
||
|
|
BPF_MOV64_REG(BPF_REG_0, BPF_REG_2),
|
||
|
|
/* r2 += 20 R0=pkt,umax=40 R2=pkt,umax=40 */
|
||
|
|
BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, 20),
|
||
|
|
/* if (r2 > r3) R0=pkt,umax=40 R2=pkt,off=20,umax=40 */
|
||
|
|
BPF_JMP_REG(BPF_JGT, BPF_REG_2, BPF_REG_3, 1),
|
||
|
|
/* r0 = *(u32 *)r0 R0=pkt,r=20,umax=40 R2=pkt,off=20,r=20,umax=40 */
|
||
|
|
BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_0, 0),
|
||
|
|
BPF_MOV64_IMM(BPF_REG_0, 0),
|
||
|
|
BPF_EXIT_INSN(),
|
||
|
|
},
|
||
|
|
.result = ACCEPT,
|
||
|
|
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
|
||
|
|
},
|
||
|
|
{
|
||
|
|
"Spill a u32 scalar at fp-4 and then at fp-8",
|
||
|
|
.insns = {
|
||
|
|
/* r4 = 4321 */
|
||
|
|
BPF_MOV32_IMM(BPF_REG_4, 4321),
|
||
|
|
/* *(u32 *)(r10 -4) = r4 */
|
||
|
|
BPF_STX_MEM(BPF_W, BPF_REG_10, BPF_REG_4, -4),
|
||
|
|
/* *(u32 *)(r10 -8) = r4 */
|
||
|
|
BPF_STX_MEM(BPF_W, BPF_REG_10, BPF_REG_4, -8),
|
||
|
|
/* r4 = *(u64 *)(r10 -8) */
|
||
|
|
BPF_LDX_MEM(BPF_DW, BPF_REG_4, BPF_REG_10, -8),
|
||
|
|
BPF_MOV64_IMM(BPF_REG_0, 0),
|
||
|
|
BPF_EXIT_INSN(),
|
||
|
|
},
|
||
|
|
.result = ACCEPT,
|
||
|
|
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
|
||
|
|
},
|