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netinet6: require network epoch for in6_pcbconnect()

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This removes recursive epoch entry in the syncache case.  Fixes
unprotected access to V_in6_ifaddrhead in in6_pcbladdr(), as
well as access to prison IP address lists. It also matches what
IPv4 in_pcbconnect() does.

Reviewed by:		markj
Differential revision:	https://reviews.freebsd.org/D38355
This commit is contained in:
Gleb Smirnoff 2023-02-03 11:33:36 -08:00
parent 221b9e3d06
commit 3d76be28ec
3 changed files with 9 additions and 8 deletions
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3
sys/netinet/tcp_usrreq.c
View file

@ -1471,13 +1471,16 @@ static int
tcp6_connect(struct tcpcb *tp, struct sockaddr *nam, struct thread *td)
{
struct inpcb *inp = tptoinpcb(tp);
struct epoch_tracker et;
int error;
INP_WLOCK_ASSERT(inp);
NET_EPOCH_ENTER(et);
INP_HASH_WLOCK(&V_tcbinfo);
error = in6_pcbconnect(inp, nam, td->td_ucred, true);
INP_HASH_WUNLOCK(&V_tcbinfo);
NET_EPOCH_EXIT(et);
if (error != 0)
return (error);

10
sys/netinet6/in6_pcb.c
View file

@ -357,8 +357,8 @@ in6_pcbladdr(struct inpcb *inp, struct sockaddr_in6 *sin6,
int error = 0;
int scope_ambiguous = 0;
struct in6_addr in6a;
struct epoch_tracker et;
NET_EPOCH_ASSERT();
INP_WLOCK_ASSERT(inp);
INP_HASH_WLOCK_ASSERT(inp->inp_pcbinfo); /* XXXRW: why? */
@ -381,10 +381,8 @@ in6_pcbladdr(struct inpcb *inp, struct sockaddr_in6 *sin6,
if ((error = prison_remote_ip6(inp->inp_cred, &sin6->sin6_addr)) != 0)
return (error);
NET_EPOCH_ENTER(et);
error = in6_selectsrc_socket(sin6, inp->in6p_outputopts,
inp, inp->inp_cred, scope_ambiguous, &in6a, NULL);
NET_EPOCH_EXIT(et);
if (error)
return (error);
@ -422,6 +420,9 @@ in6_pcbconnect(struct inpcb *inp, struct sockaddr *nam, struct ucred *cred,
struct sockaddr_in6 laddr6;
int error;
NET_EPOCH_ASSERT();
INP_WLOCK_ASSERT(inp);
INP_HASH_WLOCK_ASSERT(pcbinfo);
KASSERT(sin6->sin6_family == AF_INET6,
("%s: invalid address family for %p", __func__, sin6));
KASSERT(sin6->sin6_len == sizeof(*sin6),
@ -430,9 +431,6 @@ in6_pcbconnect(struct inpcb *inp, struct sockaddr *nam, struct ucred *cred,
bzero(&laddr6, sizeof(laddr6));
laddr6.sin6_family = AF_INET6;
INP_WLOCK_ASSERT(inp);
INP_HASH_WLOCK_ASSERT(pcbinfo);
#ifdef ROUTE_MPATH
if (CALC_FLOWID_OUTBOUND) {
uint32_t hash_type, hash_val;

4
sys/netinet6/udp6_usrreq.c
View file

@ -1101,9 +1101,7 @@ udp6_close(struct socket *so)
static int
udp6_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
{
#ifdef INET
struct epoch_tracker et;
#endif
struct inpcb *inp;
struct inpcbinfo *pcbinfo;
struct sockaddr_in6 *sin6;
@ -1181,9 +1179,11 @@ udp6_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
vflagsav = inp->inp_vflag;
inp->inp_vflag &= ~INP_IPV4;
inp->inp_vflag |= INP_IPV6;
NET_EPOCH_ENTER(et);
INP_HASH_WLOCK(pcbinfo);
error = in6_pcbconnect(inp, nam, td->td_ucred, true);
INP_HASH_WUNLOCK(pcbinfo);
NET_EPOCH_EXIT(et);
/*
* If connect succeeds, mark socket as connected. If
* connect fails and socket is unbound, reset inp_vflag