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Plug routing sysctl leaks.

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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
This commit is contained in:
Mark Johnston 2018-11-26 13:42:18 +00:00
parent 7d69e4cde7
commit d25f8522be
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=340968
3 changed files with 19 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
sys/net/if.h
View File

@ -271,6 +271,7 @@ struct if_msghdr {
int ifm_addrs; /* like rtm_addrs */
int ifm_flags; /* value of if_flags */
u_short ifm_index; /* index for associated ifp */
u_short _ifm_spare1;
struct if_data ifm_data;/* statistics and other data about if */
};
@ -296,6 +297,7 @@ struct if_msghdrl {
u_short _ifm_spare1; /* spare space to grow if_index, see if_var.h */
u_short ifm_len; /* length of if_msghdrl incl. if_data */
u_short ifm_data_off; /* offset of if_data from beginning */
int _ifm_spare2;
struct if_data ifm_data;/* statistics and other data about if */
};
@ -311,6 +313,7 @@ struct ifa_msghdr {
int ifam_addrs; /* like rtm_addrs */
int ifam_flags; /* value of ifa_flags */
u_short ifam_index; /* index for associated ifp */
u_short _ifam_spare1;
int ifam_metric; /* value of ifa_ifp->if_metric */
};
@ -352,6 +355,7 @@ struct ifma_msghdr {
int ifmam_addrs; /* like rtm_addrs */
int ifmam_flags; /* value of ifa_flags */
u_short ifmam_index; /* index for associated ifp */
u_short _ifmam_spare1;
};
/*

1
sys/net/route.h
View File

@ -251,6 +251,7 @@ struct rt_msghdr {
u_char rtm_version; /* future binary compatibility */
u_char rtm_type; /* message type */
u_short rtm_index; /* index for associated ifp */
u_short _rtm_spare1;
int rtm_flags; /* flags, incl. kern & message, e.g. DONE */
int rtm_addrs; /* bitmask identifying sockaddrs in msg */
pid_t rtm_pid; /* identify sender */

16
sys/net/rtsock.c
View File

@ -83,6 +83,7 @@ struct if_msghdr32 {
int32_t ifm_addrs;
int32_t ifm_flags;
uint16_t ifm_index;
uint16_t _ifm_spare1;
struct if_data ifm_data;
};
@ -96,6 +97,7 @@ struct if_msghdrl32 {
uint16_t _ifm_spare1;
uint16_t ifm_len;
uint16_t ifm_data_off;
uint32_t _ifm_spare2;
struct if_data ifm_data;
};
@ -1219,8 +1221,11 @@ rtsock_msg_buffer(int type, struct rt_addrinfo *rtinfo, struct walkarg *w, int *
dlen = ALIGN(len) - len;
if (buflen < dlen)
cp = NULL;
else
else {
bzero(cp, dlen);
cp += dlen;
buflen -= dlen;
}
}
len = ALIGN(len);
@ -1577,6 +1582,8 @@ sysctl_dumpentry(struct radix_node *rn, void *vw)
if (w->w_req && w->w_tmem) {
struct rt_msghdr *rtm = (struct rt_msghdr *)w->w_tmem;
bzero(&rtm->rtm_index,
sizeof(*rtm) - offsetof(struct rt_msghdr, rtm_index));
if (rt->rt_flags & RTF_GWFLAG_COMPAT)
rtm->rtm_flags = RTF_GATEWAY |
(rt->rt_flags & ~RTF_GWFLAG_COMPAT);
@ -1584,7 +1591,6 @@ sysctl_dumpentry(struct radix_node *rn, void *vw)
rtm->rtm_flags = rt->rt_flags;
rt_getmetrics(rt, &rtm->rtm_rmx);
rtm->rtm_index = rt->rt_ifp->if_index;
rtm->rtm_errno = rtm->rtm_pid = rtm->rtm_seq = 0;
rtm->rtm_addrs = info.rti_addrs;
error = SYSCTL_OUT(w->w_req, (caddr_t)rtm, size);
return (error);
@ -1612,6 +1618,7 @@ sysctl_iflist_ifml(struct ifnet *ifp, const struct if_data *src_ifd,
ifm32->_ifm_spare1 = 0;
ifm32->ifm_len = sizeof(*ifm32);
ifm32->ifm_data_off = offsetof(struct if_msghdrl32, ifm_data);
ifm32->_ifm_spare2 = 0;
ifd = &ifm32->ifm_data;
} else
#endif
@ -1622,6 +1629,7 @@ sysctl_iflist_ifml(struct ifnet *ifp, const struct if_data *src_ifd,
ifm->_ifm_spare1 = 0;
ifm->ifm_len = sizeof(*ifm);
ifm->ifm_data_off = offsetof(struct if_msghdrl, ifm_data);
ifm->_ifm_spare2 = 0;
ifd = &ifm->ifm_data;
}
@ -1647,6 +1655,7 @@ sysctl_iflist_ifm(struct ifnet *ifp, const struct if_data *src_ifd,
ifm32->ifm_addrs = info->rti_addrs;
ifm32->ifm_flags = ifp->if_flags | ifp->if_drv_flags;
ifm32->ifm_index = ifp->if_index;
ifm32->_ifm_spare1 = 0;
ifd = &ifm32->ifm_data;
} else
#endif
@ -1654,6 +1663,7 @@ sysctl_iflist_ifm(struct ifnet *ifp, const struct if_data *src_ifd,
ifm->ifm_addrs = info->rti_addrs;
ifm->ifm_flags = ifp->if_flags | ifp->if_drv_flags;
ifm->ifm_index = ifp->if_index;
ifm->_ifm_spare1 = 0;
ifd = &ifm->ifm_data;
}
@ -1722,6 +1732,7 @@ sysctl_iflist_ifam(struct ifaddr *ifa, struct rt_addrinfo *info,
ifam->ifam_addrs = info->rti_addrs;
ifam->ifam_flags = ifa->ifa_flags;
ifam->ifam_index = ifa->ifa_ifp->if_index;
ifam->_ifam_spare1 = 0;
ifam->ifam_metric = ifa->ifa_ifp->if_metric;
return (SYSCTL_OUT(w->w_req, w->w_tmem, len));
@ -1833,6 +1844,7 @@ sysctl_ifmalist(int af, struct walkarg *w)
ifmam->ifmam_index = ifma->ifma_ifp->if_index;
ifmam->ifmam_flags = 0;
ifmam->ifmam_addrs = info.rti_addrs;
ifmam->_ifmam_spare1 = 0;
error = SYSCTL_OUT(w->w_req, w->w_tmem, len);
if (error != 0)
break;