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| {
| "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 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,
| },
|
|
