6 files changed, 190 insertions, 78 deletions

diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index b65c201e9ff5..ccaf988f3729 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -117,6 +117,8 @@ static struct security_operations *secondary_ops = NULL;
 static LIST_HEAD(superblock_security_head);
 static DEFINE_SPINLOCK(sb_security_lock);
 
+static kmem_cache_t *sel_inode_cache;
+
 /* Allocate and free functions for each kind of security blob. */
 
 static int task_alloc_security(struct task_struct *task)
@@ -146,10 +148,11 @@ static int inode_alloc_security(struct inode *inode)
         struct task_security_struct *tsec = current->security;
         struct inode_security_struct *isec;
 
-        isec = kzalloc(sizeof(struct inode_security_struct), GFP_KERNEL);
+        isec = kmem_cache_alloc(sel_inode_cache, SLAB_KERNEL);
         if (!isec)
                 return -ENOMEM;
 
+        memset(isec, 0, sizeof(*isec));
         init_MUTEX(&isec->sem);
         INIT_LIST_HEAD(&isec->list);
         isec->inode = inode;
@@ -172,7 +175,7 @@ static void inode_free_security(struct inode *inode)
         spin_unlock(&sbsec->isec_lock);
 
         inode->i_security = NULL;
-        kfree(isec);
+        kmem_cache_free(sel_inode_cache, isec);
 }
 
 static int file_alloc_security(struct file *file)
@@ -1929,7 +1932,6 @@ static int selinux_inode_init_security(struct inode *inode, struct inode *dir,
         struct task_security_struct *tsec;
         struct inode_security_struct *dsec;
         struct superblock_security_struct *sbsec;
-        struct inode_security_struct *isec;
         u32 newsid, clen;
         int rc;
         char *namep = NULL, *context;
@@ -1937,7 +1939,6 @@ static int selinux_inode_init_security(struct inode *inode, struct inode *dir,
         tsec = current->security;
         dsec = dir->i_security;
         sbsec = dir->i_sb->s_security;
-        isec = inode->i_security;
 
         if (tsec->create_sid && sbsec->behavior != SECURITY_FS_USE_MNTPOINT) {
                 newsid = tsec->create_sid;
@@ -1957,7 +1958,7 @@ static int selinux_inode_init_security(struct inode *inode, struct inode *dir,
 
         inode_security_set_sid(inode, newsid);
 
-        if (sbsec->behavior == SECURITY_FS_USE_MNTPOINT)
+        if (!ss_initialized || sbsec->behavior == SECURITY_FS_USE_MNTPOINT)
                 return -EOPNOTSUPP;
 
         if (name) {
@@ -3318,24 +3319,38 @@ out:
         return err;
 }
 
-static int selinux_socket_getpeersec(struct socket *sock, char __user *optval,
-                                     int __user *optlen, unsigned len)
+static int selinux_socket_getpeersec_stream(struct socket *sock, char __user *optval,
+                                            int __user *optlen, unsigned len)
 {
         int err = 0;
         char *scontext;
         u32 scontext_len;
         struct sk_security_struct *ssec;
         struct inode_security_struct *isec;
+        u32 peer_sid = 0;
 
         isec = SOCK_INODE(sock)->i_security;
-        if (isec->sclass != SECCLASS_UNIX_STREAM_SOCKET) {
+
+        /* if UNIX_STREAM check peer_sid, if TCP check dst for labelled sa */
+        if (isec->sclass == SECCLASS_UNIX_STREAM_SOCKET) {
+                ssec = sock->sk->sk_security;
+                peer_sid = ssec->peer_sid;
+        }
+        else if (isec->sclass == SECCLASS_TCP_SOCKET) {
+                peer_sid = selinux_socket_getpeer_stream(sock->sk);
+
+                if (peer_sid == SECSID_NULL) {
+                        err = -ENOPROTOOPT;
+                        goto out;
+                }
+        }
+        else {
                 err = -ENOPROTOOPT;
                 goto out;
         }
 
-        ssec = sock->sk->sk_security;
-        
-        err = security_sid_to_context(ssec->peer_sid, &scontext, &scontext_len);
+        err = security_sid_to_context(peer_sid, &scontext, &scontext_len);
+
         if (err)
                 goto out;
 
@@ -3356,6 +3371,23 @@ out:
         return err;
 }
 
+static int selinux_socket_getpeersec_dgram(struct sk_buff *skb, char **secdata, u32 *seclen)
+{
+        int err = 0;
+        u32 peer_sid = selinux_socket_getpeer_dgram(skb);
+
+        if (peer_sid == SECSID_NULL)
+                return -EINVAL;
+
+        err = security_sid_to_context(peer_sid, secdata, seclen);
+        if (err)
+                return err;
+
+        return 0;
+}
+
+
+
 static int selinux_sk_alloc_security(struct sock *sk, int family, gfp_t priority)
 {
         return sk_alloc_security(sk, family, priority);
@@ -4344,7 +4376,8 @@ static struct security_operations selinux_ops = {
         .socket_setsockopt =            selinux_socket_setsockopt,
         .socket_shutdown =              selinux_socket_shutdown,
         .socket_sock_rcv_skb =          selinux_socket_sock_rcv_skb,
-        .socket_getpeersec =            selinux_socket_getpeersec,
+        .socket_getpeersec_stream =     selinux_socket_getpeersec_stream,
+        .socket_getpeersec_dgram =      selinux_socket_getpeersec_dgram,
         .sk_alloc_security =            selinux_sk_alloc_security,
         .sk_free_security =             selinux_sk_free_security,
         .sk_getsid =                    selinux_sk_getsid_security,
@@ -4376,6 +4409,9 @@ static __init int selinux_init(void)
         tsec = current->security;
         tsec->osid = tsec->sid = SECINITSID_KERNEL;
 
+        sel_inode_cache = kmem_cache_create("selinux_inode_security",
+                                            sizeof(struct inode_security_struct),
+                                            0, SLAB_PANIC, NULL, NULL);
         avc_init();
 
         original_ops = secondary_ops = security_ops;
diff --git a/security/selinux/include/xfrm.h b/security/selinux/include/xfrm.h
index 8e87996c6dd5..c10f1fc41502 100644
--- a/security/selinux/include/xfrm.h
+++ b/security/selinux/include/xfrm.h
@@ -39,6 +39,8 @@ static inline u32 selinux_no_sk_sid(struct flowi *fl)
 #ifdef CONFIG_SECURITY_NETWORK_XFRM
 int selinux_xfrm_sock_rcv_skb(u32 sid, struct sk_buff *skb);
 int selinux_xfrm_postroute_last(u32 isec_sid, struct sk_buff *skb);
+u32 selinux_socket_getpeer_stream(struct sock *sk);
+u32 selinux_socket_getpeer_dgram(struct sk_buff *skb);
 #else
 static inline int selinux_xfrm_sock_rcv_skb(u32 isec_sid, struct sk_buff *skb)
 {
@@ -49,6 +51,16 @@ static inline int selinux_xfrm_postroute_last(u32 isec_sid, struct sk_buff *skb)
 {
         return NF_ACCEPT;
 }
+
+static inline int selinux_socket_getpeer_stream(struct sock *sk)
+{
+        return SECSID_NULL;
+}
+
+static inline int selinux_socket_getpeer_dgram(struct sk_buff *skb)
+{
+        return SECSID_NULL;
+}
 #endif
 
 #endif /* _SELINUX_XFRM_H_ */
diff --git a/security/selinux/nlmsgtab.c b/security/selinux/nlmsgtab.c
index 69b9329b2054..85e399259832 100644
--- a/security/selinux/nlmsgtab.c
+++ b/security/selinux/nlmsgtab.c
@@ -88,8 +88,15 @@ static struct nlmsg_perm nlmsg_xfrm_perms[] =
         { XFRM_MSG_DELPOLICY,   NETLINK_XFRM_SOCKET__NLMSG_WRITE },
         { XFRM_MSG_GETPOLICY,   NETLINK_XFRM_SOCKET__NLMSG_READ  },
         { XFRM_MSG_ALLOCSPI,    NETLINK_XFRM_SOCKET__NLMSG_WRITE },
+        { XFRM_MSG_ACQUIRE,     NETLINK_XFRM_SOCKET__NLMSG_WRITE },
+        { XFRM_MSG_EXPIRE,      NETLINK_XFRM_SOCKET__NLMSG_WRITE },
         { XFRM_MSG_UPDPOLICY,   NETLINK_XFRM_SOCKET__NLMSG_WRITE },
         { XFRM_MSG_UPDSA,       NETLINK_XFRM_SOCKET__NLMSG_WRITE },
+        { XFRM_MSG_POLEXPIRE,   NETLINK_XFRM_SOCKET__NLMSG_WRITE },
+        { XFRM_MSG_FLUSHSA,     NETLINK_XFRM_SOCKET__NLMSG_WRITE },
+        { XFRM_MSG_FLUSHPOLICY, NETLINK_XFRM_SOCKET__NLMSG_WRITE },
+        { XFRM_MSG_NEWAE,       NETLINK_XFRM_SOCKET__NLMSG_WRITE },
+        { XFRM_MSG_GETAE,       NETLINK_XFRM_SOCKET__NLMSG_READ  },
 };
 
 static struct nlmsg_perm nlmsg_audit_perms[] =
diff --git a/security/selinux/selinuxfs.c b/security/selinux/selinuxfs.c
index b5fa02d17b1e..f5d78365488f 100644
--- a/security/selinux/selinuxfs.c
+++ b/security/selinux/selinuxfs.c
@@ -15,6 +15,7 @@
 #include <linux/slab.h>
 #include <linux/vmalloc.h>
 #include <linux/fs.h>
+#include <linux/mutex.h>
 #include <linux/init.h>
 #include <linux/string.h>
 #include <linux/security.h>
@@ -44,7 +45,7 @@ static int __init checkreqprot_setup(char *str)
 __setup("checkreqprot=", checkreqprot_setup);
 
 
-static DECLARE_MUTEX(sel_sem);
+static DEFINE_MUTEX(sel_mutex);
 
 /* global data for booleans */
 static struct dentry *bool_dir = NULL;
@@ -230,7 +231,7 @@ static ssize_t sel_write_load(struct file * file, const char __user * buf,
         ssize_t length;
         void *data = NULL;
 
-        down(&sel_sem);
+        mutex_lock(&sel_mutex);
 
         length = task_has_security(current, SECURITY__LOAD_POLICY);
         if (length)
@@ -262,7 +263,7 @@ static ssize_t sel_write_load(struct file * file, const char __user * buf,
         else
                 length = count;
 out:
-        up(&sel_sem);
+        mutex_unlock(&sel_mutex);
         vfree(data);
         return length;
 }
@@ -709,12 +710,11 @@ static ssize_t sel_read_bool(struct file *filep, char __user *buf,
 {
         char *page = NULL;
         ssize_t length;
-        ssize_t end;
         ssize_t ret;
         int cur_enforcing;
         struct inode *inode;
 
-        down(&sel_sem);
+        mutex_lock(&sel_mutex);
 
         ret = -EFAULT;
 
@@ -740,26 +740,9 @@ static ssize_t sel_read_bool(struct file *filep, char __user *buf,
 
         length = scnprintf(page, PAGE_SIZE, "%d %d", cur_enforcing,
                           bool_pending_values[inode->i_ino - BOOL_INO_OFFSET]);
-        if (length < 0) {
-                ret = length;
-                goto out;
-        }
-
-        if (*ppos >= length) {
-                ret = 0;
-                goto out;
-        }
-        if (count + *ppos > length)
-                count = length - *ppos;
-        end = count + *ppos;
-        if (copy_to_user(buf, (char *) page + *ppos, count)) {
-                ret = -EFAULT;
-                goto out;
-        }
-        *ppos = end;
-        ret = count;
+        ret = simple_read_from_buffer(buf, count, ppos, page, length);
 out:
-        up(&sel_sem);
+        mutex_unlock(&sel_mutex);
         if (page)
                 free_page((unsigned long)page);
         return ret;
@@ -773,7 +756,7 @@ static ssize_t sel_write_bool(struct file *filep, const char __user *buf,
         int new_value;
         struct inode *inode;
 
-        down(&sel_sem);
+        mutex_lock(&sel_mutex);
 
         length = task_has_security(current, SECURITY__SETBOOL);
         if (length)
@@ -812,7 +795,7 @@ static ssize_t sel_write_bool(struct file *filep, const char __user *buf,
         length = count;
 
 out:
-        up(&sel_sem);
+        mutex_unlock(&sel_mutex);
         if (page)
                 free_page((unsigned long) page);
         return length;
@@ -831,7 +814,7 @@ static ssize_t sel_commit_bools_write(struct file *filep,
         ssize_t length = -EFAULT;
         int new_value;
 
-        down(&sel_sem);
+        mutex_lock(&sel_mutex);
 
         length = task_has_security(current, SECURITY__SETBOOL);
         if (length)
@@ -869,7 +852,7 @@ static ssize_t sel_commit_bools_write(struct file *filep,
         length = count;
 
 out:
-        up(&sel_sem);
+        mutex_unlock(&sel_mutex);
         if (page)
                 free_page((unsigned long) page);
         return length;
@@ -987,7 +970,7 @@ out:
         return ret;
 err:
         kfree(values);
-        d_genocide(dir);
+        sel_remove_bools(dir);
         ret = -ENOMEM;
         goto out;
 }
@@ -1168,37 +1151,38 @@ static int sel_make_avc_files(struct dentry *dir)
                 dentry = d_alloc_name(dir, files[i].name);
                 if (!dentry) {
                         ret = -ENOMEM;
-                        goto err;
+                        goto out;
                 }
 
                 inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode);
                 if (!inode) {
                         ret = -ENOMEM;
-                        goto err;
+                        goto out;
                 }
                 inode->i_fop = files[i].ops;
                 d_add(dentry, inode);
         }
 out:
         return ret;
-err:
-        d_genocide(dir);
-        goto out;
 }
 
-static int sel_make_dir(struct super_block *sb, struct dentry *dentry)
+static int sel_make_dir(struct inode *dir, struct dentry *dentry)
 {
         int ret = 0;
         struct inode *inode;
 
-        inode = sel_make_inode(sb, S_IFDIR | S_IRUGO | S_IXUGO);
+        inode = sel_make_inode(dir->i_sb, S_IFDIR | S_IRUGO | S_IXUGO);
         if (!inode) {
                 ret = -ENOMEM;
                 goto out;
         }
         inode->i_op = &simple_dir_inode_operations;
         inode->i_fop = &simple_dir_operations;
+        /* directory inodes start off with i_nlink == 2 (for "." entry) */
+        inode->i_nlink++;
         d_add(dentry, inode);
+        /* bump link count on parent directory, too */
+        dir->i_nlink++;
 out:
         return ret;
 }
@@ -1207,7 +1191,7 @@ static int sel_fill_super(struct super_block * sb, void * data, int silent)
 {
         int ret;
         struct dentry *dentry;
-        struct inode *inode;
+        struct inode *inode, *root_inode;
         struct inode_security_struct *isec;
 
         static struct tree_descr selinux_files[] = {
@@ -1228,30 +1212,33 @@ static int sel_fill_super(struct super_block * sb, void * data, int silent)
         };
         ret = simple_fill_super(sb, SELINUX_MAGIC, selinux_files);
         if (ret)
-                return ret;
+                goto err;
+
+        root_inode = sb->s_root->d_inode;
 
         dentry = d_alloc_name(sb->s_root, BOOL_DIR_NAME);
-        if (!dentry)
-                return -ENOMEM;
+        if (!dentry) {
+                ret = -ENOMEM;
+                goto err;
+        }
 
-        inode = sel_make_inode(sb, S_IFDIR | S_IRUGO | S_IXUGO);
-        if (!inode)
-                goto out;
-        inode->i_op = &simple_dir_inode_operations;
-        inode->i_fop = &simple_dir_operations;
-        d_add(dentry, inode);
-        bool_dir = dentry;
-        ret = sel_make_bools();
+        ret = sel_make_dir(root_inode, dentry);
         if (ret)
-                goto out;
+                goto err;
+
+        bool_dir = dentry;
 
         dentry = d_alloc_name(sb->s_root, NULL_FILE_NAME);
-        if (!dentry)
-                return -ENOMEM;
+        if (!dentry) {
+                ret = -ENOMEM;
+                goto err;
+        }
 
         inode = sel_make_inode(sb, S_IFCHR | S_IRUGO | S_IWUGO);
-        if (!inode)
-                goto out;
+        if (!inode) {
+                ret = -ENOMEM;
+                goto err;
+        }
         isec = (struct inode_security_struct*)inode->i_security;
         isec->sid = SECINITSID_DEVNULL;
         isec->sclass = SECCLASS_CHR_FILE;
@@ -1262,22 +1249,23 @@ static int sel_fill_super(struct super_block * sb, void * data, int silent)
         selinux_null = dentry;
 
         dentry = d_alloc_name(sb->s_root, "avc");
-        if (!dentry)
-                return -ENOMEM;
+        if (!dentry) {
+                ret = -ENOMEM;
+                goto err;
+        }
 
-        ret = sel_make_dir(sb, dentry);
+        ret = sel_make_dir(root_inode, dentry);
         if (ret)
-                goto out;
+                goto err;
 
         ret = sel_make_avc_files(dentry);
         if (ret)
-                goto out;
-
-        return 0;
+                goto err;
 out:
-        dput(dentry);
+        return ret;
+err:
         printk(KERN_ERR "%s:  failed while creating inodes\n", __FUNCTION__);
-        return -ENOMEM;
+        goto out;
 }
 
 static struct super_block *sel_get_sb(struct file_system_type *fs_type,
diff --git a/security/selinux/ss/services.c b/security/selinux/ss/services.c
index 8a764928ff4b..63e0b7f29cb5 100644
--- a/security/selinux/ss/services.c
+++ b/security/selinux/ss/services.c
@@ -27,7 +27,8 @@
 #include <linux/in.h>
 #include <linux/sched.h>
 #include <linux/audit.h>
-#include <asm/semaphore.h>
+#include <linux/mutex.h>
+
 #include "flask.h"
 #include "avc.h"
 #include "avc_ss.h"
@@ -48,9 +49,9 @@ static DEFINE_RWLOCK(policy_rwlock);
 #define POLICY_RDUNLOCK read_unlock(&policy_rwlock)
 #define POLICY_WRUNLOCK write_unlock_irq(&policy_rwlock)
 
-static DECLARE_MUTEX(load_sem);
-#define LOAD_LOCK down(&load_sem)
-#define LOAD_UNLOCK up(&load_sem)
+static DEFINE_MUTEX(load_mutex);
+#define LOAD_LOCK mutex_lock(&load_mutex)
+#define LOAD_UNLOCK mutex_unlock(&load_mutex)
 
 static struct sidtab sidtab;
 struct policydb policydb;
diff --git a/security/selinux/xfrm.c b/security/selinux/xfrm.c
index b2af7ca496c1..dfab6c886698 100644
--- a/security/selinux/xfrm.c
+++ b/security/selinux/xfrm.c
@@ -225,6 +225,74 @@ void selinux_xfrm_state_free(struct xfrm_state *x)
 }
 
 /*
+ * SELinux internal function to retrieve the context of a connected
+ * (sk->sk_state == TCP_ESTABLISHED) TCP socket based on its security
+ * association used to connect to the remote socket.
+ *
+ * Retrieve via getsockopt SO_PEERSEC.
+ */
+u32 selinux_socket_getpeer_stream(struct sock *sk)
+{
+        struct dst_entry *dst, *dst_test;
+        u32 peer_sid = SECSID_NULL;
+
+        if (sk->sk_state != TCP_ESTABLISHED)
+                goto out;
+
+        dst = sk_dst_get(sk);
+        if (!dst)
+                goto out;
+
+        for (dst_test = dst; dst_test != 0;
+             dst_test = dst_test->child) {
+                struct xfrm_state *x = dst_test->xfrm;
+
+                if (x && selinux_authorizable_xfrm(x)) {
+                        struct xfrm_sec_ctx *ctx = x->security;
+                        peer_sid = ctx->ctx_sid;
+                        break;
+                }
+        }
+        dst_release(dst);
+
+out:
+        return peer_sid;
+}
+
+/*
+ * SELinux internal function to retrieve the context of a UDP packet
+ * based on its security association used to connect to the remote socket.
+ *
+ * Retrieve via setsockopt IP_PASSSEC and recvmsg with control message
+ * type SCM_SECURITY.
+ */
+u32 selinux_socket_getpeer_dgram(struct sk_buff *skb)
+{
+        struct sec_path *sp;
+
+        if (skb == NULL)
+                return SECSID_NULL;
+
+        if (skb->sk->sk_protocol != IPPROTO_UDP)
+                return SECSID_NULL;
+
+        sp = skb->sp;
+        if (sp) {
+                int i;
+
+                for (i = sp->len-1; i >= 0; i--) {
+                        struct xfrm_state *x = sp->x[i].xvec;
+                        if (selinux_authorizable_xfrm(x)) {
+                                struct xfrm_sec_ctx *ctx = x->security;
+                                return ctx->ctx_sid;
+                        }
+                }
+        }
+
+        return SECSID_NULL;
+}
+
+/*
  * LSM hook that controls access to unlabelled packets.  If
  * a xfrm_state is authorizable (defined by macro) then it was
  * already authorized by the IPSec process.  If not, then