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Add extra padding in cmsgdata buffer; there wasn't enough on

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NetBSD/sparc, resulting in overwriting the address.

Add code to check if overwriting is happening, at least for now.

Set msg_flags to MSG_DONTROUTE; they had been stack garbage.
This commit is contained in:
gdt 2004-08-11 15:58:00 +00:00
parent 246c135ecf
commit 80893817f2
1 changed files with 18 additions and 1 deletions
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19
zebra/rtadv.c
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@ -157,7 +157,14 @@ rtadv_send_packet (int sock, struct interface *ifp)
#ifdef HAVE_SOCKADDR_DL
struct sockaddr_dl *sdl;
#endif /* HAVE_SOCKADDR_DL */
char adata [sizeof (struct cmsghdr) + sizeof (struct in6_pktinfo)];
/*
* XXX: Alignment padding follows cmsghdr, and there is not
* necessarily a portable way to determine this. Add 16 bytes as a
* pessimistic assumption. (NetBSD/i386 aligns to 4, and
* NetBSD/sparc to 8.) Note check below that buf is not
* overwritten. A better fix is needed.
*/
char adata [sizeof (struct cmsghdr) + 16 + sizeof (struct in6_pktinfo)];
unsigned char buf[RTADV_MSG_SIZE];
struct nd_router_advert *rtadv;
int ret;
@ -269,6 +276,7 @@ rtadv_send_packet (int sock, struct interface *ifp)
msg.msg_iovlen = 1;
msg.msg_control = (void *) adata;
msg.msg_controllen = sizeof adata;
msg.msg_flags = MSG_DONTROUTE;
iov.iov_base = buf;
iov.iov_len = len;
@ -276,7 +284,16 @@ rtadv_send_packet (int sock, struct interface *ifp)
cmsgptr->cmsg_len = sizeof adata;
cmsgptr->cmsg_level = IPPROTO_IPV6;
cmsgptr->cmsg_type = IPV6_PKTINFO;
/* XXX Check that we do not overwrite buf. */
pkt = (struct in6_pktinfo *) CMSG_DATA (cmsgptr);
if ((void *) &pkt->ipi6_ifindex + sizeof(pkt->ipi6_ifindex)
> (void *) &addr)
{
zlog_err ("rtadv_send_packet: NOT overwriting address\n");
return;
}
memset (&pkt->ipi6_addr, 0, sizeof (struct in6_addr));
pkt->ipi6_ifindex = ifp->ifindex;