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Diffstat (limited to 'tools/testing/selftests/bpf/verifier/spill_fill.c')
-rw-r--r--tools/testing/selftests/bpf/verifier/spill_fill.c344
1 files changed, 344 insertions, 0 deletions
diff --git a/tools/testing/selftests/bpf/verifier/spill_fill.c b/tools/testing/selftests/bpf/verifier/spill_fill.c
new file mode 100644
index 000000000..e23f07175
--- /dev/null
+++ b/tools/testing/selftests/bpf/verifier/spill_fill.c
@@ -0,0 +1,344 @@
+{
+ "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 with invalid reg offset 0",
+ .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),
+ /* add invalid offset to memory or NULL */
+ BPF_ALU64_IMM(BPF_ADD, BPF_REG_0, 1),
+ /* check whether the reservation was successful */
+ BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 4),
+ /* should not be able to access *(R7) = 0 */
+ BPF_ST_MEM(BPF_W, BPF_REG_6, 0, 0),
+ /* submit the reserved ringbuf memory */
+ BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),
+ 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 = REJECT,
+ .errstr = "R0 pointer arithmetic on alloc_mem_or_null prohibited",
+},
+{
+ "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 'scalar'",
+ .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,
+},
+{
+ "Spill and refill a u32 const 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)),
+ /* r4 = 20 */
+ BPF_MOV32_IMM(BPF_REG_4, 20),
+ /* *(u32 *)(r10 -8) = r4 */
+ 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),
+ /* r0 = r2 */
+ BPF_MOV64_REG(BPF_REG_0, BPF_REG_2),
+ /* r0 += r4 R0=pkt R2=pkt R3=pkt_end R4=20 */
+ BPF_ALU64_REG(BPF_ADD, BPF_REG_0, BPF_REG_4),
+ /* if (r0 > r3) R0=pkt,off=20 R2=pkt R3=pkt_end R4=20 */
+ BPF_JMP_REG(BPF_JGT, BPF_REG_0, BPF_REG_3, 1),
+ /* r0 = *(u32 *)r2 R0=pkt,off=20,r=20 R2=pkt,r=20 R3=pkt_end R4=20 */
+ BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_2, 0),
+ BPF_MOV64_IMM(BPF_REG_0, 0),
+ BPF_EXIT_INSN(),
+ },
+ .result = ACCEPT,
+ .prog_type = BPF_PROG_TYPE_SCHED_CLS,
+},
+{
+ "Spill a u32 const, refill from another half of the uninit u32 from the stack",
+ .insns = {
+ /* r4 = 20 */
+ BPF_MOV32_IMM(BPF_REG_4, 20),
+ /* *(u32 *)(r10 -8) = r4 */
+ BPF_STX_MEM(BPF_W, BPF_REG_10, BPF_REG_4, -8),
+ /* r4 = *(u32 *)(r10 -4) fp-8=????rrrr*/
+ BPF_LDX_MEM(BPF_W, BPF_REG_4, BPF_REG_10, -4),
+ BPF_MOV64_IMM(BPF_REG_0, 0),
+ BPF_EXIT_INSN(),
+ },
+ .result = REJECT,
+ .errstr = "invalid read from stack off -4+0 size 4",
+ .prog_type = BPF_PROG_TYPE_SCHED_CLS,
+},
+{
+ "Spill a u32 const scalar. Refill as u16. 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)),
+ /* r4 = 20 */
+ BPF_MOV32_IMM(BPF_REG_4, 20),
+ /* *(u32 *)(r10 -8) = r4 */
+ BPF_STX_MEM(BPF_W, BPF_REG_10, BPF_REG_4, -8),
+ /* r4 = *(u16 *)(r10 -8) */
+ BPF_LDX_MEM(BPF_H, BPF_REG_4, BPF_REG_10, -8),
+ /* r0 = r2 */
+ BPF_MOV64_REG(BPF_REG_0, BPF_REG_2),
+ /* r0 += r4 R0=pkt R2=pkt R3=pkt_end R4=umax=65535 */
+ BPF_ALU64_REG(BPF_ADD, BPF_REG_0, BPF_REG_4),
+ /* if (r0 > r3) R0=pkt,umax=65535 R2=pkt R3=pkt_end R4=umax=65535 */
+ BPF_JMP_REG(BPF_JGT, BPF_REG_0, BPF_REG_3, 1),
+ /* r0 = *(u32 *)r2 R0=pkt,umax=65535 R2=pkt R3=pkt_end R4=20 */
+ 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 u32 const scalars. Refill as u64. 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)),
+ /* r6 = 0 */
+ BPF_MOV32_IMM(BPF_REG_6, 0),
+ /* r7 = 20 */
+ BPF_MOV32_IMM(BPF_REG_7, 20),
+ /* *(u32 *)(r10 -4) = r6 */
+ BPF_STX_MEM(BPF_W, BPF_REG_10, BPF_REG_6, -4),
+ /* *(u32 *)(r10 -8) = r7 */
+ BPF_STX_MEM(BPF_W, BPF_REG_10, BPF_REG_7, -8),
+ /* r4 = *(u64 *)(r10 -8) */
+ BPF_LDX_MEM(BPF_H, BPF_REG_4, BPF_REG_10, -8),
+ /* r0 = r2 */
+ BPF_MOV64_REG(BPF_REG_0, BPF_REG_2),
+ /* r0 += r4 R0=pkt R2=pkt R3=pkt_end R4=umax=65535 */
+ BPF_ALU64_REG(BPF_ADD, BPF_REG_0, BPF_REG_4),
+ /* if (r0 > r3) R0=pkt,umax=65535 R2=pkt R3=pkt_end R4=umax=65535 */
+ BPF_JMP_REG(BPF_JGT, BPF_REG_0, BPF_REG_3, 1),
+ /* r0 = *(u32 *)r2 R0=pkt,umax=65535 R2=pkt R3=pkt_end R4=20 */
+ 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 a u32 const scalar. Refill as u16 from fp-6. 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)),
+ /* r4 = 20 */
+ BPF_MOV32_IMM(BPF_REG_4, 20),
+ /* *(u32 *)(r10 -8) = r4 */
+ BPF_STX_MEM(BPF_W, BPF_REG_10, BPF_REG_4, -8),
+ /* r4 = *(u16 *)(r10 -6) */
+ BPF_LDX_MEM(BPF_H, BPF_REG_4, BPF_REG_10, -6),
+ /* r0 = r2 */
+ BPF_MOV64_REG(BPF_REG_0, BPF_REG_2),
+ /* r0 += r4 R0=pkt R2=pkt R3=pkt_end R4=umax=65535 */
+ BPF_ALU64_REG(BPF_ADD, BPF_REG_0, BPF_REG_4),
+ /* if (r0 > r3) R0=pkt,umax=65535 R2=pkt R3=pkt_end R4=umax=65535 */
+ BPF_JMP_REG(BPF_JGT, BPF_REG_0, BPF_REG_3, 1),
+ /* r0 = *(u32 *)r2 R0=pkt,umax=65535 R2=pkt R3=pkt_end R4=20 */
+ 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 u32 const scalar at non 8byte aligned stack addr. 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)),
+ /* r4 = 20 */
+ BPF_MOV32_IMM(BPF_REG_4, 20),
+ /* *(u32 *)(r10 -8) = r4 */
+ BPF_STX_MEM(BPF_W, BPF_REG_10, BPF_REG_4, -8),
+ /* *(u32 *)(r10 -4) = r4 */
+ BPF_STX_MEM(BPF_W, BPF_REG_10, BPF_REG_4, -4),
+ /* r4 = *(u32 *)(r10 -4), */
+ BPF_LDX_MEM(BPF_W, BPF_REG_4, BPF_REG_10, -4),
+ /* r0 = r2 */
+ 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,
+},