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3 Commits

Author SHA1 Message Date
Daniel Borkmann
4bbbf164f1 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>
 2019-10-04 12:27:36 -07:00
Alexei Starovoitov
f1fc7249dd selftests/bpf: tests for jmp to 1st insn 
Add 2 tests that check JIT code generation to jumps to 1st insn.
1st test is similar to syzbot reproducer.
The backwards branch is never taken at runtime.
2nd test has branch to 1st insn that executes.
The test is written as two bpf functions, since it's not possible
to construct valid single bpf program that jumps to 1st insn.

Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Song Liu <songliubraving@fb.com>
 2019-08-01 13:14:29 -07:00
Alexei Starovoitov
0d3679e99a selftests/bpf: add basic verifier tests for loops 
This set of tests is a rewrite of Edward's earlier tests:
https://patchwork.ozlabs.org/patch/877221/

Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
 2019-06-19 02:22:52 +02:00