Plug routing sysctl leaks.
Various structures exported by sysctl_rtsock() contain padding fields which were not being zeroed. Reported by: Thomas Barabosch, Fraunhofer FKIE Reviewed by: ae MFC after: 3 days Security: kernel memory disclosure Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D18333
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Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=340968
@ -271,6 +271,7 @@ struct if_msghdr {
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int ifm_addrs; /* like rtm_addrs */
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int ifm_flags; /* value of if_flags */
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u_short ifm_index; /* index for associated ifp */
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u_short _ifm_spare1;
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struct if_data ifm_data;/* statistics and other data about if */
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};
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@ -296,6 +297,7 @@ struct if_msghdrl {
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u_short _ifm_spare1; /* spare space to grow if_index, see if_var.h */
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u_short ifm_len; /* length of if_msghdrl incl. if_data */
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u_short ifm_data_off; /* offset of if_data from beginning */
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int _ifm_spare2;
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struct if_data ifm_data;/* statistics and other data about if */
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};
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@ -311,6 +313,7 @@ struct ifa_msghdr {
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int ifam_addrs; /* like rtm_addrs */
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int ifam_flags; /* value of ifa_flags */
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u_short ifam_index; /* index for associated ifp */
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u_short _ifam_spare1;
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int ifam_metric; /* value of ifa_ifp->if_metric */
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};
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@ -352,6 +355,7 @@ struct ifma_msghdr {
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int ifmam_addrs; /* like rtm_addrs */
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int ifmam_flags; /* value of ifa_flags */
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u_short ifmam_index; /* index for associated ifp */
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u_short _ifmam_spare1;
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};
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/*
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@ -251,6 +251,7 @@ struct rt_msghdr {
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u_char rtm_version; /* future binary compatibility */
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u_char rtm_type; /* message type */
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u_short rtm_index; /* index for associated ifp */
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u_short _rtm_spare1;
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int rtm_flags; /* flags, incl. kern & message, e.g. DONE */
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int rtm_addrs; /* bitmask identifying sockaddrs in msg */
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pid_t rtm_pid; /* identify sender */
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@ -83,6 +83,7 @@ struct if_msghdr32 {
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int32_t ifm_addrs;
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int32_t ifm_flags;
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uint16_t ifm_index;
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uint16_t _ifm_spare1;
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struct if_data ifm_data;
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};
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@ -96,6 +97,7 @@ struct if_msghdrl32 {
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uint16_t _ifm_spare1;
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uint16_t ifm_len;
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uint16_t ifm_data_off;
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uint32_t _ifm_spare2;
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struct if_data ifm_data;
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};
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@ -1219,9 +1221,12 @@ rtsock_msg_buffer(int type, struct rt_addrinfo *rtinfo, struct walkarg *w, int *
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dlen = ALIGN(len) - len;
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if (buflen < dlen)
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cp = NULL;
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else
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else {
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bzero(cp, dlen);
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cp += dlen;
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buflen -= dlen;
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}
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}
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len = ALIGN(len);
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if (cp != NULL) {
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@ -1577,6 +1582,8 @@ sysctl_dumpentry(struct radix_node *rn, void *vw)
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if (w->w_req && w->w_tmem) {
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struct rt_msghdr *rtm = (struct rt_msghdr *)w->w_tmem;
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bzero(&rtm->rtm_index,
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sizeof(*rtm) - offsetof(struct rt_msghdr, rtm_index));
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if (rt->rt_flags & RTF_GWFLAG_COMPAT)
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rtm->rtm_flags = RTF_GATEWAY |
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(rt->rt_flags & ~RTF_GWFLAG_COMPAT);
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@ -1584,7 +1591,6 @@ sysctl_dumpentry(struct radix_node *rn, void *vw)
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rtm->rtm_flags = rt->rt_flags;
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rt_getmetrics(rt, &rtm->rtm_rmx);
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rtm->rtm_index = rt->rt_ifp->if_index;
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rtm->rtm_errno = rtm->rtm_pid = rtm->rtm_seq = 0;
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rtm->rtm_addrs = info.rti_addrs;
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error = SYSCTL_OUT(w->w_req, (caddr_t)rtm, size);
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return (error);
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@ -1612,6 +1618,7 @@ sysctl_iflist_ifml(struct ifnet *ifp, const struct if_data *src_ifd,
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ifm32->_ifm_spare1 = 0;
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ifm32->ifm_len = sizeof(*ifm32);
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ifm32->ifm_data_off = offsetof(struct if_msghdrl32, ifm_data);
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ifm32->_ifm_spare2 = 0;
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ifd = &ifm32->ifm_data;
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} else
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#endif
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@ -1622,6 +1629,7 @@ sysctl_iflist_ifml(struct ifnet *ifp, const struct if_data *src_ifd,
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ifm->_ifm_spare1 = 0;
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ifm->ifm_len = sizeof(*ifm);
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ifm->ifm_data_off = offsetof(struct if_msghdrl, ifm_data);
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ifm->_ifm_spare2 = 0;
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ifd = &ifm->ifm_data;
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}
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@ -1647,6 +1655,7 @@ sysctl_iflist_ifm(struct ifnet *ifp, const struct if_data *src_ifd,
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ifm32->ifm_addrs = info->rti_addrs;
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ifm32->ifm_flags = ifp->if_flags | ifp->if_drv_flags;
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ifm32->ifm_index = ifp->if_index;
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ifm32->_ifm_spare1 = 0;
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ifd = &ifm32->ifm_data;
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} else
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#endif
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@ -1654,6 +1663,7 @@ sysctl_iflist_ifm(struct ifnet *ifp, const struct if_data *src_ifd,
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ifm->ifm_addrs = info->rti_addrs;
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ifm->ifm_flags = ifp->if_flags | ifp->if_drv_flags;
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ifm->ifm_index = ifp->if_index;
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ifm->_ifm_spare1 = 0;
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ifd = &ifm->ifm_data;
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}
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@ -1722,6 +1732,7 @@ sysctl_iflist_ifam(struct ifaddr *ifa, struct rt_addrinfo *info,
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ifam->ifam_addrs = info->rti_addrs;
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ifam->ifam_flags = ifa->ifa_flags;
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ifam->ifam_index = ifa->ifa_ifp->if_index;
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ifam->_ifam_spare1 = 0;
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ifam->ifam_metric = ifa->ifa_ifp->if_metric;
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return (SYSCTL_OUT(w->w_req, w->w_tmem, len));
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@ -1833,6 +1844,7 @@ sysctl_ifmalist(int af, struct walkarg *w)
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ifmam->ifmam_index = ifma->ifma_ifp->if_index;
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ifmam->ifmam_flags = 0;
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ifmam->ifmam_addrs = info.rti_addrs;
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ifmam->_ifmam_spare1 = 0;
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error = SYSCTL_OUT(w->w_req, w->w_tmem, len);
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if (error != 0)
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break;
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