[IPVS]: Fix for overflows

From: <pageexec@freemail.hu>

$subject was fixed in 2.4 already, 2.6 needs it as well.

The impact of the bugs is a kernel stack overflow and privilege escalation
from CAP_NET_ADMIN via the IP_VS_SO_SET_STARTDAEMON/IP_VS_SO_GET_DAEMON
ioctls.  People running with 'root=all caps' (i.e., most users) are not
really affected (there's nothing to escalate), but SELinux and similar
users should take it seriously if they grant CAP_NET_ADMIN to other users.

Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 7 insertions, 5 deletions

diff --git a/net/ipv4/ipvs/ip_vs_ctl.c b/net/ipv4/ipvs/ip_vs_ctl.c
index 218d9701036e..12a82e91d22a 100644
--- a/net/ipv4/ipvs/ip_vs_ctl.c
+++ b/net/ipv4/ipvs/ip_vs_ctl.c
@@ -2059,7 +2059,7 @@ ip_vs_copy_service(struct ip_vs_service_entry *dst, struct ip_vs_service *src)
         dst->addr = src->addr;
         dst->port = src->port;
         dst->fwmark = src->fwmark;
-        strcpy(dst->sched_name, src->scheduler->name);
+        strlcpy(dst->sched_name, src->scheduler->name, sizeof(dst->sched_name));
         dst->flags = src->flags;
         dst->timeout = src->timeout / HZ;
         dst->netmask = src->netmask;
@@ -2080,6 +2080,7 @@ __ip_vs_get_service_entries(const struct ip_vs_get_services *get,
                 list_for_each_entry(svc, &ip_vs_svc_table[idx], s_list) {
                         if (count >= get->num_services)
                                 goto out;
+                        memset(&entry, 0, sizeof(entry));
                         ip_vs_copy_service(&entry, svc);
                         if (copy_to_user(&uptr->entrytable[count],
                                          &entry, sizeof(entry))) {
@@ -2094,6 +2095,7 @@ __ip_vs_get_service_entries(const struct ip_vs_get_services *get,
                 list_for_each_entry(svc, &ip_vs_svc_fwm_table[idx], f_list) {
                         if (count >= get->num_services)
                                 goto out;
+                        memset(&entry, 0, sizeof(entry));
                         ip_vs_copy_service(&entry, svc);
                         if (copy_to_user(&uptr->entrytable[count],
                                          &entry, sizeof(entry))) {
@@ -2304,12 +2306,12 @@ do_ip_vs_get_ctl(struct sock *sk, int cmd, void __user *user, int *len)
                 memset(&d, 0, sizeof(d));
                 if (ip_vs_sync_state & IP_VS_STATE_MASTER) {
                         d[0].state = IP_VS_STATE_MASTER;
-                        strcpy(d[0].mcast_ifn, ip_vs_master_mcast_ifn);
+                        strlcpy(d[0].mcast_ifn, ip_vs_master_mcast_ifn, sizeof(d[0].mcast_ifn));
                         d[0].syncid = ip_vs_master_syncid;
                 }
                 if (ip_vs_sync_state & IP_VS_STATE_BACKUP) {
                         d[1].state = IP_VS_STATE_BACKUP;
-                        strcpy(d[1].mcast_ifn, ip_vs_backup_mcast_ifn);
+                        strlcpy(d[1].mcast_ifn, ip_vs_backup_mcast_ifn, sizeof(d[1].mcast_ifn));
                         d[1].syncid = ip_vs_backup_syncid;
                 }
                 if (copy_to_user(user, &d, sizeof(d)) != 0)
diff --git a/net/ipv4/ipvs/ip_vs_sync.c b/net/ipv4/ipvs/ip_vs_sync.c
index 25c479550a32..574d1f509b46 100644
--- a/net/ipv4/ipvs/ip_vs_sync.c
+++ b/net/ipv4/ipvs/ip_vs_sync.c
@@ -839,10 +839,10 @@ int start_sync_thread(int state, char *mcast_ifn, __u8 syncid)
 
         ip_vs_sync_state |= state;
         if (state == IP_VS_STATE_MASTER) {
-                strcpy(ip_vs_master_mcast_ifn, mcast_ifn);
+                strlcpy(ip_vs_master_mcast_ifn, mcast_ifn, sizeof(ip_vs_master_mcast_ifn));
                 ip_vs_master_syncid = syncid;
         } else {
-                strcpy(ip_vs_backup_mcast_ifn, mcast_ifn);
+                strlcpy(ip_vs_backup_mcast_ifn, mcast_ifn, sizeof(ip_vs_backup_mcast_ifn));
                 ip_vs_backup_syncid = syncid;
         }