linux-kernel - Re: [RFC PATCH] arm64: bpf: fix endianness conversion bugs

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Message-ID: <20150626131744.GF3078@e104818-lin.cambridge.arm.com>
Date:	Fri, 26 Jun 2015 14:17:44 +0100
From:	Catalin Marinas <catalin.marinas@....com>
To:	Xi Wang <xi.wang@...il.com>
Cc:	linux-arm-kernel@...ts.infradead.org,
	Zi Shen Lim <zlim.lnx@...il.com>,
	linux-kernel@...r.kernel.org, Alexei Starovoitov <ast@...mgrid.com>
Subject: Re: [RFC PATCH] arm64: bpf: fix endianness conversion bugs

On Thu, Jun 25, 2015 at 06:39:15PM -0700, Xi Wang wrote:
> Upper bits should be zeroed in endianness conversion:
> 
> - even when there's no need to change endianness (i.e., BPF_FROM_BE
>   on big endian or BPF_FROM_LE on little endian);
> 
> - after rev16.
> 
> This patch fixes such bugs by emitting extra instructions to clear
> upper bits.
> 
> Cc: Zi Shen Lim <zlim.lnx@...il.com>
> Cc: Alexei Starovoitov <ast@...mgrid.com>
> Fixes: e54bcde3d69d ("arm64: eBPF JIT compiler")
> Signed-off-by: Xi Wang <xi.wang@...il.com>

Applied. Thanks.

-- 
Catalin
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