Messages in this thread | | | Subject | Re: [REGRESSION][PATCH] bpf_jit drops the ball on indirect negative mem references | From | Eric Dumazet <> | Date | Wed, 28 Mar 2012 22:05:29 +0200 |
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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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