diff options
Diffstat (limited to 'tools/testing/selftests/bpf/verifier/spill_fill.c')
| -rw-r--r-- | tools/testing/selftests/bpf/verifier/spill_fill.c | 106 |
1 files changed, 106 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..0b943897a --- /dev/null +++ b/tools/testing/selftests/bpf/verifier/spill_fill.c @@ -0,0 +1,106 @@ +{ + "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, +}, |