bpf: Add loop test case with 32 bit reg comparison against 0
authorDaniel Borkmann <daniel@iogearbox.net>
Wed, 2 Oct 2019 23:45:12 +0000 (01:45 +0200)
committerAlexei Starovoitov <ast@kernel.org>
Fri, 4 Oct 2019 19:27:36 +0000 (12:27 -0700)
commit4bbbf164f1a5e970543dcdb7a396fc1cf477725b
tree2a39e91267f10f8ef586dbad422821c07fceb7a0
parent38f51c07054ff4796e473dba3bff2e648378002c
bpf: Add loop test case with 32 bit reg comparison against 0

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>
tools/testing/selftests/bpf/verifier/loops1.c