diff -uprN linux-2.6.8.1-ve022stab038/arch/i386/kernel/ldt.c linux-2.6.8.1-ve022stab038-m/arch/i386/kernel/ldt.c --- linux-2.6.8.1-ve022stab038/arch/i386/kernel/ldt.c Fri Oct 7 06:16:48 2005 +++ linux-2.6.8.1-ve022stab038-m/arch/i386/kernel/ldt.c Thu Oct 13 12:33:22 2005 @@ -39,6 +39,10 @@ static int alloc_ldt(mm_context_t *pc, i * LDT got larger - reallocate if necessary. */ oldsize = pc->size; +/* AUDIT-UN: we sanity-check for large newsize (BUG_ON in the loop below), + * yet we don't check for possible integer overflow on the calculation + * of newsize from mincount. (This does not appear to be triggerable with + * the current code due to checks in the callers, hence non-security.) */ mincount = (mincount+511)&(~511); newsize = mincount*LDT_ENTRY_SIZE; for (i = 0; i < newsize; i += PAGE_SIZE) { diff -uprN linux-2.6.8.1-ve022stab038/arch/ia64/kernel/perfmon.c linux-2.6.8.1-ve022stab038-m/arch/ia64/kernel/perfmon.c --- linux-2.6.8.1-ve022stab038/arch/ia64/kernel/perfmon.c Fri Oct 7 06:16:48 2005 +++ linux-2.6.8.1-ve022stab038-m/arch/ia64/kernel/perfmon.c Thu Oct 27 08:41:03 2005 @@ -2387,6 +2387,8 @@ pfm_bad_permissions(struct task_struct * task->egid, task->sgid)); +/* AUDIT-V?: need VPS check here? and/or enhance pfm_get_task() to use + * find_task_by_pid_ve() */ return ((current->uid != task->euid) || (current->uid != task->suid) || (current->uid != task->uid) @@ -2619,6 +2621,7 @@ pfm_get_task(pfm_context_t *ctx, pid_t p read_lock(&tasklist_lock); +/* AUDIT-V?: should be find_task_by_pid_ve()? */ p = find_task_by_pid(pid); /* make sure task cannot go away while we operate on it */ diff -uprN linux-2.6.8.1-ve022stab038/drivers/acpi/asus_acpi.c linux-2.6.8.1-ve022stab038-m/drivers/acpi/asus_acpi.c --- linux-2.6.8.1-ve022stab038/drivers/acpi/asus_acpi.c Sat Aug 14 09:36:44 2004 +++ linux-2.6.8.1-ve022stab038-m/drivers/acpi/asus_acpi.c Mon Oct 17 19:12:02 2005 @@ -826,6 +826,7 @@ static int __init asus_hotk_add_fs(struc * and then set to -rw-rw---- */ +/* AUDIT-UM: so much for "safe defaults"... */ if ((asus_uid == 0) && (asus_gid == 0)){ mode = S_IFREG | S_IRUGO | S_IWUGO; } else { diff -uprN linux-2.6.8.1-ve022stab038/drivers/char/agp/frontend.c linux-2.6.8.1-ve022stab038-m/drivers/char/agp/frontend.c --- linux-2.6.8.1-ve022stab038/drivers/char/agp/frontend.c Sat Aug 14 09:36:17 2004 +++ linux-2.6.8.1-ve022stab038-m/drivers/char/agp/frontend.c Mon Oct 17 16:35:47 2005 @@ -716,6 +716,7 @@ static int agp_open(struct inode *inode, set_bit(AGP_FF_ALLOW_CLIENT, &priv->access_flags); priv->my_pid = current->pid; +/* AUDIT-UL, AUDIT-V?: should check a capability not available to VPS root. */ if ((current->uid == 0) || (current->suid == 0)) { /* Root priv, can be controller */ set_bit(AGP_FF_ALLOW_CONTROLLER, &priv->access_flags); diff -uprN linux-2.6.8.1-ve022stab038/drivers/net/ethertap.c linux-2.6.8.1-ve022stab038-m/drivers/net/ethertap.c --- linux-2.6.8.1-ve022stab038/drivers/net/ethertap.c Sat Aug 14 09:36:32 2004 +++ linux-2.6.8.1-ve022stab038-m/drivers/net/ethertap.c Mon Oct 17 18:52:01 2005 @@ -245,6 +245,8 @@ static __inline__ int ethertap_rx_skb(st kfree_skb(skb); return -EINVAL; } +/* AUDIT-UL: doesn't this grant privs to UID 0 even when running SECURE_NOROOT? */ +/* AUDIT-V?: should this be allowed for VPS root? */ if (NETLINK_CREDS(skb)->uid) { printk(KERN_INFO "%s : user %d\n", dev->name, NETLINK_CREDS(skb)->uid); kfree_skb(skb); diff -uprN linux-2.6.8.1-ve022stab038/drivers/net/wan/sbni.c linux-2.6.8.1-ve022stab038-m/drivers/net/wan/sbni.c --- linux-2.6.8.1-ve022stab038/drivers/net/wan/sbni.c Sat Aug 14 09:36:45 2004 +++ linux-2.6.8.1-ve022stab038-m/drivers/net/wan/sbni.c Mon Oct 17 17:41:51 2005 @@ -1321,6 +1321,7 @@ sbni_ioctl( struct net_device *dev, st break; case SIOCDEVRESINSTATS : +/* AUDIT-UL: should check a capability */ if( current->euid != 0 ) /* root only */ return -EPERM; memset( &nl->in_stats, 0, sizeof(struct sbni_in_stats) ); @@ -1338,6 +1339,7 @@ sbni_ioctl( struct net_device *dev, st break; case SIOCDEVSHWSTATE : +/* AUDIT-UL: should check a capability */ if( current->euid != 0 ) /* root only */ return -EPERM; @@ -1359,6 +1361,7 @@ sbni_ioctl( struct net_device *dev, st #ifdef CONFIG_SBNI_MULTILINE case SIOCDEVENSLAVE : +/* AUDIT-UL: should check a capability */ if( current->euid != 0 ) /* root only */ return -EPERM; @@ -1374,6 +1377,7 @@ sbni_ioctl( struct net_device *dev, st return enslave( dev, slave_dev ); case SIOCDEVEMANSIPATE : +/* AUDIT-UL: should check a capability */ if( current->euid != 0 ) /* root only */ return -EPERM; diff -uprN linux-2.6.8.1-ve022stab038/drivers/s390/crypto/z90main.c linux-2.6.8.1-ve022stab038-m/drivers/s390/crypto/z90main.c --- linux-2.6.8.1-ve022stab038/drivers/s390/crypto/z90main.c Sat Aug 14 09:36:11 2004 +++ linux-2.6.8.1-ve022stab038-m/drivers/s390/crypto/z90main.c Mon Oct 17 17:44:18 2005 @@ -1870,6 +1870,7 @@ z90crypt_ioctl(struct inode *inode, stru break; case Z90QUIESCE: +/* AUDIT-UL: should check a capability */ if (current->euid != 0) { PRINTK("QUIESCE fails: euid %d\n", current->euid); diff -uprN linux-2.6.8.1-ve022stab038/fs/fcntl.c linux-2.6.8.1-ve022stab038-m/fs/fcntl.c --- linux-2.6.8.1-ve022stab038/fs/fcntl.c Fri Oct 7 06:16:49 2005 +++ linux-2.6.8.1-ve022stab038-m/fs/fcntl.c Mon Oct 17 15:37:45 2005 @@ -439,6 +439,9 @@ static long band_table[NSIGPOLL] = { static inline int sigio_perm(struct task_struct *p, struct fown_struct *fown) { +/* AUDIT-UL: shouldn't this be checking a capability instead of euid == 0? */ +/* AUDIT-VN: this does not appear to be a security problem for OVZ due to + * checks in send_sigio() and no intention to run SECURE_NOROOT OVZ systems. */ return ((fown->euid == 0) || (fown->euid == p->suid) || (fown->euid == p->uid) || (fown->uid == p->suid) || (fown->uid == p->uid)); diff -uprN linux-2.6.8.1-ve022stab038/fs/open.c linux-2.6.8.1-ve022stab038-m/fs/open.c --- linux-2.6.8.1-ve022stab038/fs/open.c Fri Oct 7 06:16:49 2005 +++ linux-2.6.8.1-ve022stab038-m/fs/open.c Mon Oct 17 19:15:52 2005 @@ -530,6 +530,7 @@ asmlinkage long sys_access(const char __ * value below. We should hold task_capabilities_lock, * but we cannot because user_path_walk can sleep. */ +/* AUDIT-UL: should also check for SECURE_NOROOT */ if (current->uid) cap_clear(current->cap_effective); else diff -uprN linux-2.6.8.1-ve022stab038/fs/proc/base.c linux-2.6.8.1-ve022stab038-m/fs/proc/base.c --- linux-2.6.8.1-ve022stab038/fs/proc/base.c Fri Oct 7 06:16:49 2005 +++ linux-2.6.8.1-ve022stab038-m/fs/proc/base.c Thu Oct 27 08:53:59 2005 @@ -295,6 +295,8 @@ static int may_ptrace_attach(struct task if (!task->mm) goto out; +/* AUDIT-OK: we're safe due to the uses of find_task_by_pid_ve(), but could + * want to enhance this with a VPS check anyway (defensive programming). */ if (((current->uid != task->euid) || (current->uid != task->suid) || (current->uid != task->uid) || diff -uprN linux-2.6.8.1-ve022stab038/fs/umsdos/ioctl.c linux-2.6.8.1-ve022stab038-m/fs/umsdos/ioctl.c --- linux-2.6.8.1-ve022stab038/fs/umsdos/ioctl.c Sat Aug 14 09:36:16 2004 +++ linux-2.6.8.1-ve022stab038-m/fs/umsdos/ioctl.c Mon Oct 17 17:41:16 2005 @@ -115,6 +115,7 @@ dentry->d_parent->d_name.name, dentry->d goto out; ret = -EPERM; +/* AUDIT-UL: should check a capability */ if (current->euid != 0 && cmd != UMSDOS_GETVERSION) goto out; diff -uprN linux-2.6.8.1-ve022stab038/ipc/mqueue.c linux-2.6.8.1-ve022stab038-m/ipc/mqueue.c --- linux-2.6.8.1-ve022stab038/ipc/mqueue.c Fri Oct 7 06:16:50 2005 +++ linux-2.6.8.1-ve022stab038-m/ipc/mqueue.c Mon Nov 14 15:45:10 2005 @@ -269,6 +269,10 @@ static int mqueue_create(struct inode *d int error; spin_lock(&mq_lock); +/* AUDIT-VM: queues_count is not virtualized - possible to DoS the + * functionality for the entire system? */ +/* AUDIT-VM: potential integer overflow, possible other side-effects of + * queues_count becoming very large? */ if (queues_count >= queues_max && !capable(CAP_SYS_RESOURCE)) { error = -ENOSPC; goto out_lock; @@ -572,6 +576,7 @@ static int mq_attr_ok(struct mq_attr *at { if (attr->mq_maxmsg <= 0 || attr->mq_msgsize <= 0) return 0; +/* AUDIT-OK: semi-OK due to HARD_MSGMAX */ if (capable(CAP_SYS_RESOURCE)) { if (attr->mq_maxmsg > HARD_MSGMAX) return 0; diff -uprN linux-2.6.8.1-ve022stab038/ipc/msg.c linux-2.6.8.1-ve022stab038-m/ipc/msg.c --- linux-2.6.8.1-ve022stab038/ipc/msg.c Fri Oct 7 06:16:50 2005 +++ linux-2.6.8.1-ve022stab038-m/ipc/msg.c Mon Nov 14 15:35:34 2005 @@ -480,6 +480,11 @@ asmlinkage long sys_msgctl (int msqid, i case IPC_SET: { err = -EPERM; +/* AUDIT-VM: load_msg() does beancounted allocations, however allowing for + * message queues to grow arbitrarily large might not be safe because of + * potential integer overflows and the use of plain linked lists (slow). + * Recommendation: either drop the capability check or impose another + * limitation. */ if (setbuf.qbytes > msg_ctlmnb && !capable(CAP_SYS_RESOURCE)) goto out_unlock_up; @@ -604,6 +609,8 @@ retry: if (err) goto out_unlock_free; +/* AUDIT-V?: potential integer overflow here if q_qbytes is very large and + * thus msq->q_cbytes and/or msq->q_qnum were allowed to grow large. */ if(msgsz + msq->q_cbytes > msq->q_qbytes || 1 + msq->q_qnum > msq->q_qbytes) { struct msg_sender s; @@ -635,6 +642,8 @@ retry: if(!pipelined_send(msq,msg)) { /* noone is waiting for this message, enqueue it */ +/* AUDIT-V?: the linked list as well as q_cbytes and q_qnum may grow very + * large if q_qbytes allows for that. */ list_add_tail(&msg->m_list,&msq->q_messages); msq->q_cbytes += msgsz; msq->q_qnum++; diff -uprN linux-2.6.8.1-ve022stab038/kernel/ptrace.c linux-2.6.8.1-ve022stab038-m/kernel/ptrace.c --- linux-2.6.8.1-ve022stab038/kernel/ptrace.c Fri Oct 7 06:16:50 2005 +++ linux-2.6.8.1-ve022stab038-m/kernel/ptrace.c Thu Oct 27 08:58:00 2005 @@ -89,6 +89,11 @@ int ptrace_attach(struct task_struct *ta goto bad; if (!task->mm) goto bad; +/* AUDIT-OK: we're safe due to the uses of find_task_by_pid_ve() in arch + * code on i386 and x86_64 (including 32-bit compat), but we could want to + * enhance this with a VPS check anyway to be safe for other archs and as + * a defensive programming measure. */ +/* AUDIT-VH: ia64 ptrace.c is not patched */ if(((current->uid != task->euid) || (current->uid != task->suid) || (current->uid != task->uid) || diff -uprN linux-2.6.8.1-ve022stab038/kernel/sys.c linux-2.6.8.1-ve022stab038-m/kernel/sys.c --- linux-2.6.8.1-ve022stab038/kernel/sys.c Fri Oct 7 06:16:50 2005 +++ linux-2.6.8.1-ve022stab038-m/kernel/sys.c Thu Oct 20 03:45:46 2005 @@ -754,6 +754,13 @@ int set_user(uid_t new_ruid, int dumpcle { struct user_struct *new_user; +/* AUDIT-UM: This may cause setreuid, setuid, and setresuid to fail on + * transient errors, which older and/or poorly-written user-space apps + * might not expect. A similar Linux 2.2 kernel problem is known to + * result in a root compromise with older versions of Sendmail: + * http://www.sendmail.org/sendmail.8.10.1.LINUX-SECURITY.txt + * That Linux 2.2 problem had been fixed, however this new one is + * introduced somewhere between 2.2 and 2.4... */ new_user = alloc_uid(new_ruid); if (!new_user) return -EAGAIN; diff -uprN linux-2.6.8.1-ve022stab038/kernel/ub/ub_sys.c linux-2.6.8.1-ve022stab038-m/kernel/ub/ub_sys.c --- linux-2.6.8.1-ve022stab038/kernel/ub/ub_sys.c Fri Oct 7 06:16:50 2005 +++ linux-2.6.8.1-ve022stab038-m/kernel/ub/ub_sys.c Thu Oct 20 04:05:44 2005 @@ -60,6 +60,8 @@ asmlinkage long sys_setluid(uid_t uid) struct task_beancounter *task_bc; int error; +/* AUDIT-VN: better check ve_is_super() first, then CAP_SETUID, and only then + * proceed to lookup task_bc. */ task_bc = task_bc(current); /* You may not disown a setluid */ diff -uprN linux-2.6.8.1-ve022stab038/kernel/vecalls.c linux-2.6.8.1-ve022stab038-m/kernel/vecalls.c --- linux-2.6.8.1-ve022stab038/kernel/vecalls.c Fri Oct 7 06:16:50 2005 +++ linux-2.6.8.1-ve022stab038-m/kernel/vecalls.c Thu Oct 27 08:11:43 2005 @@ -1899,6 +1899,7 @@ static int do_env_create(envid_t veid, u goto err_ve_hook; move_task(tsk, ve, old); +/* AUDIT-V?F: race */ set_task_caps(tsk, ve); ve->is_running = 1; @@ -2066,6 +2067,7 @@ static int do_env_enter(struct ve_struct SET_VE_LINKS(tsk); write_unlock_irq(&tasklist_lock); +/* AUDIT-VMF: race */ set_task_caps(tsk, ve); err = VE_TASK_INFO(tsk)->owner_env->veid; diff -uprN linux-2.6.8.1-ve022stab038/mm/mlock.c linux-2.6.8.1-ve022stab038-m/mm/mlock.c --- linux-2.6.8.1-ve022stab038/mm/mlock.c Fri Oct 7 06:16:50 2005 +++ linux-2.6.8.1-ve022stab038-m/mm/mlock.c Thu Oct 20 05:04:53 2005 @@ -128,6 +128,7 @@ asmlinkage long sys_mlock(unsigned long start &= PAGE_MASK; locked = len >> PAGE_SHIFT; +/* AUDIT-UL, AUDIT-V?: integer overflow, may bypass RLIMIT_MEMLOCK */ locked += current->mm->locked_vm; lock_limit = current->rlim[RLIMIT_MEMLOCK].rlim_cur; diff -uprN linux-2.6.8.1-ve022stab038/mm/mmap.c linux-2.6.8.1-ve022stab038-m/mm/mmap.c --- linux-2.6.8.1-ve022stab038/mm/mmap.c Fri Oct 7 06:16:50 2005 +++ linux-2.6.8.1-ve022stab038-m/mm/mmap.c Thu Oct 20 05:10:23 2005 @@ -848,6 +848,8 @@ unsigned long do_mmap_pgoff(struct file /* mlock MCL_FUTURE? */ if (vm_flags & VM_LOCKED) { unsigned long locked = mm->locked_vm << PAGE_SHIFT; +/* AUDIT-UL, AUDIT-V?: integer overflow, RLIMIT_MEMLOCK bypass (the checks on + * len above likely mitigate this for many systems). */ locked += len; if (locked > current->rlim[RLIMIT_MEMLOCK].rlim_cur) return -EAGAIN; diff -uprN linux-2.6.8.1-ve022stab038/net/bridge/netfilter/ebtables.c linux-2.6.8.1-ve022stab038-m/net/bridge/netfilter/ebtables.c --- linux-2.6.8.1-ve022stab038/net/bridge/netfilter/ebtables.c Sat Aug 14 09:36:45 2004 +++ linux-2.6.8.1-ve022stab038-m/net/bridge/netfilter/ebtables.c Sun Oct 16 06:03:44 2005 @@ -915,6 +915,7 @@ static int do_replace(void __user *user, if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) return -EFAULT; +/* AUDIT-UN, AUDIT-V?: these BUGPRINT()s are printk()s with no rate limits */ if (len != sizeof(tmp) + tmp.entries_size) { BUGPRINT("Wrong len argument\n"); return -EINVAL; @@ -924,6 +925,8 @@ static int do_replace(void __user *user, BUGPRINT("Entries_size never zero\n"); return -EINVAL; } +/* AUDIT-UL, AUDIT-V?: integer overflow, see comments in ip_tables.c */ +/* AUDIT-V?: uncounted/unlimited vmalloc() */ countersize = COUNTER_OFFSET(tmp.nentries) * NR_CPUS; newinfo = (struct ebt_table_info *) vmalloc(sizeof(struct ebt_table_info) + countersize); @@ -933,6 +936,7 @@ static int do_replace(void __user *user, if (countersize) memset(newinfo->counters, 0, countersize); +/* AUDIT-V?: uncounted/unlimited vmalloc() */ newinfo->entries = (char *)vmalloc(tmp.entries_size); if (!newinfo->entries) { ret = -ENOMEM; @@ -948,6 +952,8 @@ static int do_replace(void __user *user, /* the user wants counters back the check on the size is done later, when we have the lock */ if (tmp.num_counters) { +/* AUDIT-U?, AUDIT-V?: integer overflow, see comments in ip_tables.c */ +/* AUDIT-V?: uncounted/unlimited vmalloc() */ counterstmp = (struct ebt_counter *) vmalloc(tmp.num_counters * sizeof(struct ebt_counter)); if (!counterstmp) { @@ -975,6 +981,7 @@ static int do_replace(void __user *user, if (t->check && (ret = t->check(newinfo, tmp.valid_hooks))) goto free_unlock; +/* This check might make the integer overflow unexploitable */ if (tmp.num_counters && tmp.num_counters != t->private->nentries) { BUGPRINT("Wrong nr. of counters requested\n"); ret = -EINVAL; @@ -1227,11 +1234,14 @@ static int update_counters(void __user * if (copy_from_user(&hlp, user, sizeof(hlp))) return -EFAULT; +/* AUDIT-UN, AUDIT-VN: integer overflow, see comments in ip_tables.c */ if (len != sizeof(hlp) + hlp.num_counters * sizeof(struct ebt_counter)) return -EINVAL; if (hlp.num_counters == 0) return -EINVAL; +/* AUDIT-UN, AUDIT-V?: integer overflow, see comments in ip_tables.c */ +/* AUDIT-V?: unlimited vmalloc() */ if ( !(tmp = (struct ebt_counter *) vmalloc(hlp.num_counters * sizeof(struct ebt_counter))) ){ MEMPRINT("Update_counters && nomemory\n"); @@ -1242,6 +1252,7 @@ static int update_counters(void __user * if (!t) goto free_tmp; +/* This check might make the integer overflow unexploitable */ if (hlp.num_counters != t->private->nentries) { BUGPRINT("Wrong nr of counters\n"); ret = -EINVAL; diff -uprN linux-2.6.8.1-ve022stab038/net/core/sock.c linux-2.6.8.1-ve022stab038-m/net/core/sock.c --- linux-2.6.8.1-ve022stab038/net/core/sock.c Fri Oct 7 06:16:50 2005 +++ linux-2.6.8.1-ve022stab038-m/net/core/sock.c Thu Oct 20 04:38:16 2005 @@ -371,6 +371,8 @@ int sock_setsockopt(struct socket *sock, if (!valbool) { sk->sk_bound_dev_if = 0; } else { +/* The check is signed, but that's OK due to optlen having been checked for + * possibly being negative right in sys_setsockopt(). */ if (optlen > IFNAMSIZ) optlen = IFNAMSIZ; if (copy_from_user(devname, optval, optlen)) { @@ -384,6 +386,13 @@ int sock_setsockopt(struct socket *sock, if (devname[0] == '\0') { sk->sk_bound_dev_if = 0; } else { +/* AUDIT-UN, AUDIT-VL: devname comes from userspace (is under VPS root control) + * and it might not be NUL-terminated. dev_get_by_name() uses strncmp() on it + * with IFNAMSIZ as the max length (good), however the actual number of bytes + * initialized in devname[] may be less than that (if optlen is less), + * resulting in the strncmp() checking uninitialized kernel stack space. + * Potential data leaks, one bit per call? */ +/* dev_get_by_name() is VPS-aware - good */ struct net_device *dev = dev_get_by_name(devname); if (!dev) { ret = -ENODEV; diff -uprN linux-2.6.8.1-ve022stab038/net/ipv4/netfilter/arp_tables.c linux-2.6.8.1-ve022stab038-m/net/ipv4/netfilter/arp_tables.c --- linux-2.6.8.1-ve022stab038/net/ipv4/netfilter/arp_tables.c Sat Aug 14 09:38:11 2004 +++ linux-2.6.8.1-ve022stab038-m/net/ipv4/netfilter/arp_tables.c Sun Oct 16 06:02:16 2005 @@ -789,6 +789,7 @@ static int copy_entries_to_user(unsigned * about). */ countersize = sizeof(struct arpt_counters) * table->private->number; +/* AUDIT-V?: uncounted vmalloc() (it's freed soon, though) */ counters = vmalloc(countersize); if (counters == NULL) @@ -882,6 +883,8 @@ static int do_replace(void __user *user, if ((SMP_ALIGN(tmp.size) >> PAGE_SHIFT) + 2 > num_physpages) return -ENOMEM; +/* AUDIT-UL, AUDIT-V?: integer overflow, see comments in ip_tables.c */ +/* AUDIT-V?: uncounted/unlimited vmalloc() */ newinfo = vmalloc(sizeof(struct arpt_table_info) + SMP_ALIGN(tmp.size) * NR_CPUS); if (!newinfo) @@ -893,6 +896,8 @@ static int do_replace(void __user *user, goto free_newinfo; } +/* AUDIT-UL, AUDIT-V?: integer overflow, see comments in ip_tables.c */ +/* AUDIT-V?: uncounted/unlimited vmalloc() */ counters = vmalloc(tmp.num_counters * sizeof(struct arpt_counters)); if (!counters) { ret = -ENOMEM; @@ -989,9 +994,11 @@ static int do_add_counters(void __user * if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) return -EFAULT; +/* AUDIT-UN, AUDIT-V?: integer overflow, see comments in ip_tables.c */ if (len != sizeof(tmp) + tmp.num_counters*sizeof(struct arpt_counters)) return -EINVAL; +/* AUDIT-V?: uncounted/unlimited vmalloc() */ paddc = vmalloc(len); if (!paddc) return -ENOMEM; @@ -1006,6 +1013,7 @@ static int do_add_counters(void __user * goto free; write_lock_bh(&t->lock); +/* AUDIT-UN, AUDIT-V?: race condition, see comments in ip_tables.c */ if (t->private->number != paddc->num_counters) { ret = -EINVAL; goto unlock_up_free; diff -uprN linux-2.6.8.1-ve022stab038/net/ipv4/netfilter/ip_tables.c linux-2.6.8.1-ve022stab038-m/net/ipv4/netfilter/ip_tables.c --- linux-2.6.8.1-ve022stab038/net/ipv4/netfilter/ip_tables.c Fri Oct 7 06:16:50 2005 +++ linux-2.6.8.1-ve022stab038-m/net/ipv4/netfilter/ip_tables.c Mon Oct 17 19:20:09 2005 @@ -1212,6 +1212,16 @@ do_replace(void __user *user, unsigned i if ((SMP_ALIGN(tmp.size) >> PAGE_SHIFT) + 2 > num_physpages) return -ENOMEM; +/* AUDIT-UL: Could overflow on addition within SMP_ALIGN() and/or on + * multiplication by NR_CPUS, resulting in a buffer overflow on the + * copy_from_user(). In practice, the overflow on addition is triggerable + * on all systems, whereas the multiplication one might require much + * physical memory to be present due to the check above. Either is + * sufficient to overwrite arbitrary amounts of kernel memory. */ +/* AUDIT-VHF: On OVZ, the above becomes a security vulnerability triggerable + * by VPS root. Additionally, the allocation size is almost unlimited + * (even with no integer overflow involved). + * FIXED in OVZ by pre-checking for possible integer overflow. */ newinfo = ipt_table_info_alloc(sizeof(struct ipt_table_info) + SMP_ALIGN(tmp.size) * NR_CPUS); if (!newinfo) @@ -1222,6 +1232,10 @@ do_replace(void __user *user, unsigned i goto free_newinfo; } +/* AUDIT-UL: Could overflow on multiplication; tmp.num_counters comes from + * userspace. */ +/* AUDIT-VHF: The above becomes a security issue when VPS root is untrusted. + * FIXED in OVZ by pre-checking for possible integer overflow. */ counters = ub_vmalloc_best(tmp.num_counters * sizeof(struct ipt_counters)); if (!counters) { @@ -1329,6 +1343,7 @@ do_add_counters(void __user *user, unsig if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) return -EFAULT; +/* AUDIT-UN: integer overflow. */ if (len != sizeof(tmp) + tmp.num_counters*sizeof(struct ipt_counters)) return -EINVAL; @@ -1336,6 +1351,9 @@ do_add_counters(void __user *user, unsig if (!paddc) return -ENOMEM; +/* AUDIT-UN: race condition: the beginning of paddc is supposed + * to be the same as tmp which was sanity-checked above, but it might not + * be the same in reality. */ if (copy_from_user(paddc, user, len) != 0) { ret = -EFAULT; goto free; @@ -1346,6 +1364,14 @@ do_add_counters(void __user *user, unsig goto free; write_lock_bh(&t->lock); +/* AUDIT-UN, AUDIT-VMF: in case the integer overflow and/or the race condition + * above are triggered, paddc->num_counters might not match the allocation + * size for paddc. If the check below nevertheless passes (this + * requires the race condition to be triggered), IPT_ENTRY_ITERATE() would + * read kernel memory beyond the allocation size, potentially leaking + * sensitive data (e.g., passwords from host system or from another VPS) via + * counter increments. + * FIXED in OVZ -044 by using tmp.num_counters here */ if (t->private->number != paddc->num_counters) { ret = -EINVAL; goto unlock_up_free; @@ -1631,6 +1657,12 @@ int ipt_register_table(struct ipt_table struct ipt_table_info *newinfo; ret = -ENOMEM; +/* AUDIT-UN: is table->table->size trusted? - YES. Who calls us? + * Callers: iptable_filter.c, ip_nat_rule.c, iptable_mangle.c, iptable_raw.c; + * in all cases, "size" comes from a pre-initialized struct, which is + * hopefully not overwritten. However, since ipt_register_table() is + * exported for use by modules, theoretically other callers may be added. + * A sanity check on "size" wouldn't hurt. */ newinfo = ipt_table_info_alloc(sizeof(struct ipt_table_info) + SMP_ALIGN(table->table->size) * NR_CPUS); if (!newinfo) diff -uprN linux-2.6.8.1-ve022stab038/net/ipv6/netfilter/ip6_tables.c linux-2.6.8.1-ve022stab038-m/net/ipv6/netfilter/ip6_tables.c --- linux-2.6.8.1-ve022stab038/net/ipv6/netfilter/ip6_tables.c Sat Aug 14 09:37:40 2004 +++ linux-2.6.8.1-ve022stab038-m/net/ipv6/netfilter/ip6_tables.c Sun Oct 16 06:07:34 2005 @@ -1037,6 +1037,7 @@ copy_entries_to_user(unsigned int total_ (other than comefrom, which userspace doesn't care about). */ countersize = sizeof(struct ip6t_counters) * table->private->number; +/* AUDIT-V?: uncounted vmalloc() (it's freed soon, though) */ counters = vmalloc(countersize); if (counters == NULL) @@ -1146,6 +1147,8 @@ do_replace(void __user *user, unsigned i if ((SMP_ALIGN(tmp.size) >> PAGE_SHIFT) + 2 > num_physpages) return -ENOMEM; +/* AUDIT-UL, AUDIT-V?: integer overflow, see comments in ip_tables.c */ +/* AUDIT-V?: uncounted/unlimited vmalloc() */ newinfo = vmalloc(sizeof(struct ip6t_table_info) + SMP_ALIGN(tmp.size) * NR_CPUS); if (!newinfo) @@ -1157,6 +1160,8 @@ do_replace(void __user *user, unsigned i goto free_newinfo; } +/* AUDIT-UL, AUDIT-V?: integer overflow, see comments in ip_tables.c */ +/* AUDIT-V?: uncounted/unlimited vmalloc() */ counters = vmalloc(tmp.num_counters * sizeof(struct ip6t_counters)); if (!counters) { ret = -ENOMEM; @@ -1262,9 +1267,11 @@ do_add_counters(void __user *user, unsig if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) return -EFAULT; +/* AUDIT-UN, AUDIT-V?: integer overflow, see comments in ip_tables.c */ if (len != sizeof(tmp) + tmp.num_counters*sizeof(struct ip6t_counters)) return -EINVAL; +/* AUDIT-V?: uncounted/unlimited vmalloc() */ paddc = vmalloc(len); if (!paddc) return -ENOMEM; @@ -1279,6 +1286,7 @@ do_add_counters(void __user *user, unsig goto free; write_lock_bh(&t->lock); +/* AUDIT-UN, AUDIT-V?: race condition, see comments in ip_tables.c */ if (t->private->number != paddc->num_counters) { ret = -EINVAL; goto unlock_up_free; 
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