linux-kernel - Re: [PATCH] net: filter: make JITs zero A for SKF_AD_ALU_XOR

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Message-Id: <20160106.004442.109655096478479740.davem@davemloft.net>
Date:	Wed, 06 Jan 2016 00:44:42 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	rabin@....in
Cc:	netdev@...r.kernel.org, daniel@...earbox.net, ast@...nel.org,
	linux-arm-kernel@...ts.infradead.org, linux-mips@...ux-mips.org,
	linuxppc-dev@...ts.ozlabs.org, sparclinux@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net: filter: make JITs zero A for SKF_AD_ALU_XOR_X

From: Rabin Vincent <rabin@....in>
Date: Tue,  5 Jan 2016 16:23:07 +0100

> The SKF_AD_ALU_XOR_X ancillary is not like the other ancillary data
> instructions since it XORs A with X while all the others replace A with
> some loaded value.  All the BPF JITs fail to clear A if this is used as
> the first instruction in a filter.  This was found using american fuzzy
> lop.
> 
> Add a helper to determine if A needs to be cleared given the first
> instruction in a filter, and use this in the JITs.  Except for ARM, the
> rest have only been compile-tested.
> 
> Fixes: 3480593131e0 ("net: filter: get rid of BPF_S_* enum")
> Signed-off-by: Rabin Vincent <rabin@....in>

Applied and queued up for -stable, thanks!
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