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bpf: Add loop test case with 32 bit reg comparison against 0

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Add a loop test with 32 bit register against 0 immediate:

  # ./test_verifier 631
  #631/p taken loop with back jump to 1st insn, 2 OK

Disassembly:

  [...]
  1b:	test   %edi,%edi
  1d:	jne    0x0000000000000014
  [...]

Pretty much similar to prior "taken loop with back jump to 1st
insn" test case just as jmp32 variant.

Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Song Liu <songliubraving@fb.com>
This commit is contained in:
Daniel Borkmann 2019-10-03 01:45:12 +02:00 committed by Alexei Starovoitov
parent 38f51c0705
commit 4bbbf164f1
1 changed files with 17 additions and 0 deletions
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17
tools/testing/selftests/bpf/verifier/loops1.c
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@ -187,3 +187,20 @@
.prog_type = BPF_PROG_TYPE_XDP,
.retval = 55,
},
{
"taken loop with back jump to 1st insn, 2",
.insns = {
BPF_MOV64_IMM(BPF_REG_1, 10),
BPF_MOV64_IMM(BPF_REG_2, 0),
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 1),
BPF_EXIT_INSN(),
BPF_ALU64_REG(BPF_ADD, BPF_REG_2, BPF_REG_1),
BPF_ALU64_IMM(BPF_SUB, BPF_REG_1, 1),
BPF_JMP32_IMM(BPF_JNE, BPF_REG_1, 0, -3),
BPF_MOV64_REG(BPF_REG_0, BPF_REG_2),
BPF_EXIT_INSN(),
},
.result = ACCEPT,
.prog_type = BPF_PROG_TYPE_XDP,
.retval = 55,
},