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Fix the bind security fix introduced in rev 1.38 to work with multicast:

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- Don't bother checking for conflicting sockets if we're binding to a
  multicast address.
- Don't return an error if we're binding to INADDR_ANY, the conflicting
  socket is bound to INADDR_ANY, and the conflicting socket has SO_REUSEPORT
  set.

PR:		kern/7713
This commit is contained in:
Bill Fenner 1998-09-17 18:42:16 +00:00
parent 0aba3bf3d2
commit 52b65dbe85
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=39426
1 changed files with 9 additions and 3 deletions
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12
sys/netinet/in_pcb.c
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@ -31,7 +31,7 @@
* SUCH DAMAGE.
*
* @(#)in_pcb.c 8.4 (Berkeley) 5/24/95
* $Id: in_pcb.c,v 1.43 1998/04/19 17:22:30 phk Exp $
* $Id: in_pcb.c,v 1.44 1998/05/15 20:11:32 wollman Exp $
*/
#include <sys/param.h>
@ -197,10 +197,16 @@ in_pcbbind(inp, nam, p)
if (ntohs(lport) < IPPORT_RESERVED && p &&
suser(p->p_ucred, &p->p_acflag))
return (EACCES);
if (so->so_uid) {
if (so->so_uid &&
!IN_MULTICAST(ntohl(sin->sin_addr.s_addr))) {
t = in_pcblookup_local(inp->inp_pcbinfo,
sin->sin_addr, lport, INPLOOKUP_WILDCARD);
if (t && (so->so_uid != t->inp_socket->so_uid))
if (t &&
(ntohl(sin->sin_addr.s_addr) != INADDR_ANY ||
ntohl(t->inp_laddr.s_addr) != INADDR_ANY ||
(t->inp_socket->so_options &
SO_REUSEPORT) == 0) &&
(so->so_uid != t->inp_socket->so_uid))
return (EADDRINUSE);
}
t = in_pcblookup_local(pcbinfo, sin->sin_addr,