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Message-ID: <1332965129.2325.12.camel@edumazet-glaptop>
Date: Wed, 28 Mar 2012 22:05:29 +0200
From: Eric Dumazet <eric.dumazet@...il.com>
To: Jan Seiffert <kaffeemonster@...glemail.com>
Cc: netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
"David S. Miller" <davem@...emloft.net>,
Matt Evans <matt@...abs.org>
Subject: Re: [REGRESSION][PATCH] bpf_jit drops the ball on indirect
negative mem references
On Wed, 2012-03-28 at 21:15 +0200, Jan Seiffert wrote:
> Consider the following test program:
>
> #include <stdio.h>
> #include <sys/types.h>
> #include <sys/socket.h>
> #include <netinet/in.h>
> #include <pcap-bpf.h>
>
> #define die(x) do {perror(x); return 1;} while (0)
> struct bpf_insn udp_filter[] = {
> /* 0 */ BPF_STMT(BPF_LDX|BPF_W|BPF_IMM, -1048576+(0)), /* leax net[0] */
> /* 1 */ BPF_STMT(BPF_LD|BPF_B|BPF_IND, 0), /* ldb [x+0] */
> /* 2 */ BPF_STMT(BPF_RET|BPF_A, 0), /* ret a */
> };
When this point was raised some weeks ago, we wanted to see a _real_ use
of negative mem reference.
You provide a test program but what this filter is supposed to do
exactly ?
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