Guy Harris wrote:
No, because I don't have the Linux kernel source handy at present, but
what you want to do is edit net/core/dev.c, look for "case
SIOCGIFHWADDR:" somewhere around line 2362, and change the code to do
Actually, the existing code already refuses to copy more than "sizeof
ifr->ifr_hwaddr.sa_data" bytes, so you might just want to take the patch at
http://oss.oracle.com/projects/rhel4kernels/src/mainline/current/SOURCES/linux-2.6.9-net-SIOCGIFHWADDR-NULL-dev_addr.patch
and apply it to the Linux kernel with "patch -R", to back that patch out.
If you're ambitious, you could then change the code to
case SIOCGIFHWADDR:
if (!dev->addr_len)
memset(ifr->ifr_hwaddr.sa_data, 0, sizeof ifr->ifr_hwaddr.sa_data);
else
memcpy(ifr->ifr_hwaddr.sa_data, dev->dev_addr,
min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len));
ifr->ifr_hwaddr.sa_family = dev->type;
return 0;
(so as not to lose the "memset()").
Or just upgrade to a more recent kernel, such as 2.6.10, which *already*
works like that - but don't pick up Red Hat's change that caused the
ioctl to return an error.
