Date: Fri, 13 Jan 2012 19:20:33 +0000 (UTC) From: John Baldwin <jhb@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-8@freebsd.org Subject: svn commit: r230075 - in stable/8/sys: netinet netinet6 Message-ID: <201201131920.q0DJKXCP076127@svn.freebsd.org>
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Author: jhb Date: Fri Jan 13 19:20:33 2012 New Revision: 230075 URL: http://svn.freebsd.org/changeset/base/230075 Log: MFC 229414,229476,229477: Various fixes to the SIOC[DG]LIFADDR ioctl handlers: - Grab a reference on any matching interface address (ifa) before dropping the IF_ADDR_LOCK() and release the reference after using it to prevent a potential use-after-free. - Fix the IPv4 ioctl handlers in in_lifaddr_ioctl() to work with IPv4 interface addresses rather than IPv6. - Add missing interface address list locking in the IPv4 handlers. Modified: stable/8/sys/netinet/in.c stable/8/sys/netinet6/in6.c Directory Properties: stable/8/sys/ (props changed) stable/8/sys/amd64/include/xen/ (props changed) stable/8/sys/cddl/contrib/opensolaris/ (props changed) stable/8/sys/contrib/dev/acpica/ (props changed) stable/8/sys/contrib/pf/ (props changed) Modified: stable/8/sys/netinet/in.c ============================================================================== --- stable/8/sys/netinet/in.c Fri Jan 13 19:20:09 2012 (r230074) +++ stable/8/sys/netinet/in.c Fri Jan 13 19:20:33 2012 (r230075) @@ -720,7 +720,7 @@ in_lifaddr_ioctl(struct socket *so, u_lo if (iflr->flags & IFLR_PREFIX) return (EINVAL); - /* copy args to in_aliasreq, perform ioctl(SIOCAIFADDR_IN6). */ + /* copy args to in_aliasreq, perform ioctl(SIOCAIFADDR). */ bzero(&ifra, sizeof(ifra)); bcopy(iflr->iflr_name, ifra.ifra_name, sizeof(ifra.ifra_name)); @@ -769,8 +769,9 @@ in_lifaddr_ioctl(struct socket *so, u_lo } } + IF_ADDR_LOCK(ifp); TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { - if (ifa->ifa_addr->sa_family != AF_INET6) + if (ifa->ifa_addr->sa_family != AF_INET) continue; if (match.s_addr == 0) break; @@ -779,6 +780,9 @@ in_lifaddr_ioctl(struct socket *so, u_lo if (candidate.s_addr == match.s_addr) break; } + if (ifa != NULL) + ifa_ref(ifa); + IF_ADDR_UNLOCK(ifp); if (ifa == NULL) return (EADDRNOTAVAIL); ia = (struct in_ifaddr *)ifa; @@ -797,12 +801,13 @@ in_lifaddr_ioctl(struct socket *so, u_lo in_mask2len(&ia->ia_sockmask.sin_addr); iflr->flags = 0; /*XXX*/ + ifa_free(ifa); return (0); } else { struct in_aliasreq ifra; - /* fill in_aliasreq and do ioctl(SIOCDIFADDR_IN6) */ + /* fill in_aliasreq and do ioctl(SIOCDIFADDR) */ bzero(&ifra, sizeof(ifra)); bcopy(iflr->iflr_name, ifra.ifra_name, sizeof(ifra.ifra_name)); @@ -815,6 +820,7 @@ in_lifaddr_ioctl(struct socket *so, u_lo } bcopy(&ia->ia_sockmask, &ifra.ifra_dstaddr, ia->ia_sockmask.sin_len); + ifa_free(ifa); return (in_control(so, SIOCDIFADDR, (caddr_t)&ifra, ifp, td)); Modified: stable/8/sys/netinet6/in6.c ============================================================================== --- stable/8/sys/netinet6/in6.c Fri Jan 13 19:20:09 2012 (r230074) +++ stable/8/sys/netinet6/in6.c Fri Jan 13 19:20:33 2012 (r230075) @@ -1655,6 +1655,8 @@ in6_lifaddr_ioctl(struct socket *so, u_l if (IN6_ARE_ADDR_EQUAL(&candidate, &match)) break; } + if (ifa != NULL) + ifa_ref(ifa); IF_ADDR_UNLOCK(ifp); if (!ifa) return EADDRNOTAVAIL; @@ -1667,16 +1669,20 @@ in6_lifaddr_ioctl(struct socket *so, u_l bcopy(&ia->ia_addr, &iflr->addr, ia->ia_addr.sin6_len); error = sa6_recoverscope( (struct sockaddr_in6 *)&iflr->addr); - if (error != 0) + if (error != 0) { + ifa_free(ifa); return (error); + } if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { bcopy(&ia->ia_dstaddr, &iflr->dstaddr, ia->ia_dstaddr.sin6_len); error = sa6_recoverscope( (struct sockaddr_in6 *)&iflr->dstaddr); - if (error != 0) + if (error != 0) { + ifa_free(ifa); return (error); + } } else bzero(&iflr->dstaddr, sizeof(iflr->dstaddr)); @@ -1684,6 +1690,7 @@ in6_lifaddr_ioctl(struct socket *so, u_l in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); iflr->flags = ia->ia6_flags; /* XXX */ + ifa_free(ifa); return 0; } else { @@ -1707,6 +1714,7 @@ in6_lifaddr_ioctl(struct socket *so, u_l ia->ia_prefixmask.sin6_len); ifra.ifra_flags = ia->ia6_flags; + ifa_free(ifa); return in6_control(so, SIOCDIFADDR_IN6, (caddr_t)&ifra, ifp, td); }
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