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bpf, selftests: Add verifier test for mem_or_null register with offset. 

Add a new test case with mem_or_null typed register with off > 0 to ensure
it gets rejected by the verifier:

  # ./test_verifier 1011
  #1009/u check with invalid reg offset 0 OK
  #1009/p check with invalid reg offset 0 OK
  Summary: 2 PASSED, 0 SKIPPED, 0 FAILED

Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Daniel Borkmann 2022-01-05 11:33:34 -08:00 committed by Alexei Starovoitov
parent e60b0d12a9
commit ca796fe66f
1 changed files with 28 additions and 0 deletions
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28
tools/testing/selftests/bpf/verifier/spill_fill.c
View File

@ -58,6 +58,34 @@
.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 mem_or_null prohibited",
},
{
"check corrupted spill/fill",
.insns = {