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

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Message-Id: <20150525.001536.383553511855379504.davem@davemloft.net>
Date:	Mon, 25 May 2015 00:15:36 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	daniel@...earbox.net
Cc:	ast@...mgrid.com, edumazet@...gle.com, netdev@...r.kernel.org
Subject: Re: [PATCH net-next] test_bpf: add more eBPF jump torture cases

From: Daniel Borkmann <daniel@...earbox.net>
Date: Sat, 23 May 2015 01:10:07 +0200

> 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 <daniel@...earbox.net>

Applied, thank you.
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