Re: nmap on sparc/linux

On Mon, 2002-12-16 at 17:09, Cliff Woolley wrote:

> I assume it's a valid assumption among this group that everybody knows
> that SIGBUS on a Sparc usually means an unaligned access was attempted,
> right?

As Cliff pointed out, it is probably an unaligned access error. Here is
the culprit line after the preprocessor has had its way:

A = (ntohl(*(bpf_u_int32 *)&p[k]));

(gdb) disassemble ntohl
Dump of assembler code for function ntohl:
0x702ce540 <ntohl>: nop
0x702ce544 <ntohl+4>: retl
0x702ce548 <ntohl+8>: nop

ntohl is a noop because we are on a big endian architecture.

(gdb) print k
$15 = 30
(gdb) print &p[k]
$16 = (u_char *) 0x7267be "\n\aĆ\034\b"

Can we just make a char* an int* and dereference it? Only if it is 4
byte aligned.

-tduffy

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