netdev - Re: [PATCH v2 net] net: filter: x86: fix JIT address randomization

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Message-ID: <1400019540.7973.62.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Tue, 13 May 2014 15:19:00 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Alexei Starovoitov <ast@...mgrid.com>
Cc:	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Daniel Borkmann <dborkman@...hat.com>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	netdev@...r.kernel.org
Subject: Re: [PATCH v2 net] net: filter: x86: fix JIT address randomization

On Tue, 2014-05-13 at 15:05 -0700, Alexei Starovoitov wrote:

> 
> Fix it by making sure that &header->image[prandom_u32() % hole] and &header
> are in the same page
> 
> Fixes: 314beb9bcabfd ("x86: bpf_jit_comp: secure bpf jit against spraying attacks")
> Signed-off-by: Alexei Starovoitov <ast@...mgrid.com>
> ---
>  arch/x86/net/bpf_jit_comp.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)

Thanks Alexei.

Acked-by: Eric Dumazet <edumazet@...gle.com>


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