lkml.org 
[lkml]   [2012]   [Mar]   [28]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [REGRESSION][PATCH] bpf_jit drops the ball on indirect negative mem references
From
Date
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 ?





\
 
 \ /
  Last update: 2012-03-28 22:07    [W:0.069 / U:0.468 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site