Subject: Re: [PATCH net-next] test_bpf: add more eBPF jump torture cases

From: Alexei Starovoitov <[email-masked]>
Date: Fri, 22 May 2015 16:28:57 -0700

On 5/22/15 4:10 PM, Daniel Borkmann wrote:
> Add two more eBPF test cases for JITs, i.e. the second one revealed a
> bug in the x86_64 JIT compiler, where only an int3 filled image from
> the allocator was emitted and later wrongly set by the compiler as the
> bpf_func program code since optimization pass boundary was surpassed
> w/o actually emitting opcodes.
>
> Interpreter:
>
>    [   45.782892] test_bpf: #242 BPF_MAXINSNS: Very long jump backwards jited:0 11 PASS
>    [   45.783062] test_bpf: #243 BPF_MAXINSNS: Edge hopping nuthouse jited:0 14705 PASS
>
> After x86_64 JIT (fixed):
>
>    [   80.495638] test_bpf: #242 BPF_MAXINSNS: Very long jump backwards jited:1 6 PASS
>    [   80.495957] test_bpf: #243 BPF_MAXINSNS: Edge hopping nuthouse jited:1 17157 PASS
>
> Reference: http://thread.gmane.org/gmane.linux.network/364729
> Signed-off-by: Daniel Borkmann <[email-masked]>

Thanks a lot for great tests!

Acked-by: Alexei Starovoitov <[email-masked]>