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Code Issues Releases Activity

Cache SO_REUSEPORT socket option in inpcb-layer in order to avoid

Browse Source 
inp_socket->so_options dereference when we may not acquire the lock on
the inpcb.

This fixes the crash due to NULL pointer dereference in
in_pcbbind_setup() when inp_socket->so_options in a pcb returned by
in_pcblookup_local() was checked.

Reported by:	dave jones <s.dave.jones@gmail.com>, Arnaud Lacombe <lacombar@gmail.com>
Suggested by:	rwatson
Glanced by:	rwatson
Tested by:	dave jones <s.dave.jones@gmail.com>
This commit is contained in:
Mikolaj Golub 2011-11-06 10:47:20 +00:00
parent 29381b363b
commit fc06cd427e
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=227207
5 changed files with 80 additions and 22 deletions
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11
sys/netinet/in_pcb.c
View File

@ -575,8 +575,7 @@ in_pcbbind_setup(struct inpcb *inp, struct sockaddr *nam, in_addr_t *laddrp,
ntohl(t->inp_faddr.s_addr) == INADDR_ANY) &&
(ntohl(sin->sin_addr.s_addr) != INADDR_ANY ||
ntohl(t->inp_laddr.s_addr) != INADDR_ANY ||
(t->inp_socket->so_options &
SO_REUSEPORT) == 0) &&
(t->inp_flags2 & INP_REUSEPORT) == 0) &&
(inp->inp_cred->cr_uid !=
t->inp_cred->cr_uid))
return (EADDRINUSE);
@ -594,15 +593,15 @@ in_pcbbind_setup(struct inpcb *inp, struct sockaddr *nam, in_addr_t *laddrp,
if (tw == NULL ||
(reuseport & tw->tw_so_options) == 0)
return (EADDRINUSE);
} else if (t &&
(reuseport & t->inp_socket->so_options) == 0) {
} else if (t && (reuseport == 0 ||
(t->inp_flags2 & INP_REUSEPORT) == 0)) {
#ifdef INET6
if (ntohl(sin->sin_addr.s_addr) !=
INADDR_ANY ||
ntohl(t->inp_laddr.s_addr) !=
INADDR_ANY ||
INP_SOCKAF(so) ==
INP_SOCKAF(t->inp_socket))
(inp->inp_vflag & INP_IPV6PROTO) == 0 ||
(t->inp_vflag & INP_IPV6PROTO) == 0)
#endif
return (EADDRINUSE);
}

1
sys/netinet/in_pcb.h
View File

@ -540,6 +540,7 @@ void inp_4tuple_get(struct inpcb *inp, uint32_t *laddr, uint16_t *lp,
#define INP_LLE_VALID 0x00000001 /* cached lle is valid */
#define INP_RT_VALID 0x00000002 /* cached rtentry is valid */
#define INP_PCBGROUPWILD 0x00000004 /* in pcbgroup wildcard list */
#define INP_REUSEPORT 0x00000008 /* SO_REUSEPORT option is set */
/*
* Flags passed to in_pcblookup*() functions.

41
sys/netinet/ip_output.c
View File

@ -895,12 +895,43 @@ ip_ctloutput(struct socket *so, struct sockopt *sopt)
error = optval = 0;
if (sopt->sopt_level != IPPROTO_IP) {
if ((sopt->sopt_level == SOL_SOCKET) &&
(sopt->sopt_name == SO_SETFIB)) {
inp->inp_inc.inc_fibnum = so->so_fibnum;
return (0);
error = EINVAL;
if (sopt->sopt_level == SOL_SOCKET &&
sopt->sopt_dir == SOPT_SET) {
switch (sopt->sopt_name) {
case SO_REUSEADDR:
INP_WLOCK(inp);
if (IN_MULTICAST(ntohl(inp->inp_laddr.s_addr))) {
if ((so->so_options &
(SO_REUSEADDR | SO_REUSEPORT)) != 0)
inp->inp_flags2 |= INP_REUSEPORT;
else
inp->inp_flags2 &= ~INP_REUSEPORT;
}
INP_WUNLOCK(inp);
error = 0;
break;
case SO_REUSEPORT:
INP_WLOCK(inp);
if ((so->so_options & SO_REUSEPORT) != 0)
inp->inp_flags2 |= INP_REUSEPORT;
else
inp->inp_flags2 &= ~INP_REUSEPORT;
INP_WUNLOCK(inp);
error = 0;
break;
case SO_SETFIB:
INP_WLOCK(inp);
inp->inp_inc.inc_fibnum = so->so_fibnum;
INP_WUNLOCK(inp);
error = 0;
break;
default:
break;
}
}
return (EINVAL);
return (error);
}
switch (sopt->sopt_dir) {

14
sys/netinet6/in6_pcb.c
View File

@ -207,8 +207,8 @@ in6_pcbbind(register struct inpcb *inp, struct sockaddr *nam,
IN6_IS_ADDR_UNSPECIFIED(&t->in6p_faddr)) &&
(!IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr) ||
!IN6_IS_ADDR_UNSPECIFIED(&t->in6p_laddr) ||
(t->inp_socket->so_options & SO_REUSEPORT)
== 0) && (inp->inp_cred->cr_uid !=
(t->inp_flags2 & INP_REUSEPORT) == 0) &&
(inp->inp_cred->cr_uid !=
t->inp_cred->cr_uid))
return (EADDRINUSE);
#ifdef INET
@ -267,12 +267,10 @@ in6_pcbbind(register struct inpcb *inp, struct sockaddr *nam,
INP_IPV6PROTO) ==
(t->inp_vflag & INP_IPV6PROTO))))
return (EADDRINUSE);
}
else if (t &&
(reuseport & t->inp_socket->so_options)
== 0 && (ntohl(t->inp_laddr.s_addr) !=
INADDR_ANY || INP_SOCKAF(so) ==
INP_SOCKAF(t->inp_socket)))
} else if (t && (reuseport == 0 ||
(t->inp_flags2 & INP_REUSEPORT) == 0) &&
(ntohl(t->inp_laddr.s_addr) != INADDR_ANY ||
(t->inp_vflag & INP_IPV6PROTO) == 0))
return (EADDRINUSE);
}
#endif

35
sys/netinet6/ip6_output.c
View File

@ -1421,7 +1421,38 @@ ip6_ctloutput(struct socket *so, struct sockopt *sopt)
optval = 0;
uproto = (int)so->so_proto->pr_protocol;
if (level == IPPROTO_IPV6) {
if (level != IPPROTO_IPV6) {
error = EINVAL;
if (sopt->sopt_level == SOL_SOCKET &&
sopt->sopt_dir == SOPT_SET) {
switch (sopt->sopt_name) {
case SO_REUSEADDR:
INP_WLOCK(in6p);
if (IN_MULTICAST(ntohl(in6p->inp_laddr.s_addr))) {
if ((so->so_options &
(SO_REUSEADDR | SO_REUSEPORT)) != 0)
in6p->inp_flags2 |= INP_REUSEPORT;
else
in6p->inp_flags2 &= ~INP_REUSEPORT;
}
INP_WUNLOCK(in6p);
error = 0;
break;
case SO_REUSEPORT:
INP_WLOCK(in6p);
if ((so->so_options & SO_REUSEPORT) != 0)
in6p->inp_flags2 |= INP_REUSEPORT;
else
in6p->inp_flags2 &= ~INP_REUSEPORT;
INP_WUNLOCK(in6p);
error = 0;
break;
default:
break;
}
}
} else { /* level == IPPROTO_IPV6 */
switch (op) {
case SOPT_SET:
@ -2044,8 +2075,6 @@ do { \
}
break;
}
} else { /* level != IPPROTO_IPV6 */
error = EINVAL;
}
return (error);
}