1 files changed, 114 insertions, 178 deletions

diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index 5c9f25ba1c95..9b40f4c0ac70 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -87,9 +87,6 @@
 #include "netlabel.h"
 #include "audit.h"
 
-#define XATTR_SELINUX_SUFFIX "selinux"
-#define XATTR_NAME_SELINUX XATTR_SECURITY_PREFIX XATTR_SELINUX_SUFFIX
-
 #define NUM_SEL_MNT_OPTS 5
 
 extern int selinux_nlmsg_lookup(u16 sclass, u16 nlmsg_type, u32 *perm);
@@ -188,7 +185,7 @@ static inline u32 task_sid(const struct task_struct *task)
  */
 static inline u32 current_sid(void)
 {
-        const struct task_security_struct *tsec = current_cred()->security;
+        const struct task_security_struct *tsec = current_security();
 
         return tsec->sid;
 }
@@ -279,32 +276,6 @@ static void superblock_free_security(struct super_block *sb)
         kfree(sbsec);
 }
 
-static int sk_alloc_security(struct sock *sk, int family, gfp_t priority)
-{
-        struct sk_security_struct *sksec;
-
-        sksec = kzalloc(sizeof(*sksec), priority);
-        if (!sksec)
-                return -ENOMEM;
-
-        sksec->peer_sid = SECINITSID_UNLABELED;
-        sksec->sid = SECINITSID_UNLABELED;
-        sk->sk_security = sksec;
-
-        selinux_netlbl_sk_security_reset(sksec);
-
-        return 0;
-}
-
-static void sk_free_security(struct sock *sk)
-{
-        struct sk_security_struct *sksec = sk->sk_security;
-
-        sk->sk_security = NULL;
-        selinux_netlbl_sk_security_free(sksec);
-        kfree(sksec);
-}
-
 /* The security server must be initialized before
    any labeling or access decisions can be provided. */
 extern int ss_initialized;
@@ -1584,8 +1555,7 @@ static int may_create(struct inode *dir,
                       struct dentry *dentry,
                       u16 tclass)
 {
-        const struct cred *cred = current_cred();
-        const struct task_security_struct *tsec = cred->security;
+        const struct task_security_struct *tsec = current_security();
         struct inode_security_struct *dsec;
         struct superblock_security_struct *sbsec;
         u32 sid, newsid;
@@ -1806,27 +1776,9 @@ static inline u32 open_file_to_av(struct file *file)
 {
         u32 av = file_to_av(file);
 
-        if (selinux_policycap_openperm) {
-                mode_t mode = file->f_path.dentry->d_inode->i_mode;
-                /*
-                 * lnk files and socks do not really have an 'open'
-                 */
-                if (S_ISREG(mode))
-                        av |= FILE__OPEN;
-                else if (S_ISCHR(mode))
-                        av |= CHR_FILE__OPEN;
-                else if (S_ISBLK(mode))
-                        av |= BLK_FILE__OPEN;
-                else if (S_ISFIFO(mode))
-                        av |= FIFO_FILE__OPEN;
-                else if (S_ISDIR(mode))
-                        av |= DIR__OPEN;
-                else if (S_ISSOCK(mode))
-                        av |= SOCK_FILE__OPEN;
-                else
-                        printk(KERN_ERR "SELinux: WARNING: inside %s with "
-                                "unknown mode:%o\n", __func__, mode);
-        }
+        if (selinux_policycap_openperm)
+                av |= FILE__OPEN;
+
         return av;
 }
 
@@ -2183,8 +2135,7 @@ static int selinux_bprm_set_creds(struct linux_binprm *bprm)
 
 static int selinux_bprm_secureexec(struct linux_binprm *bprm)
 {
-        const struct cred *cred = current_cred();
-        const struct task_security_struct *tsec = cred->security;
+        const struct task_security_struct *tsec = current_security();
         u32 sid, osid;
         int atsecure = 0;
 
@@ -2559,8 +2510,7 @@ static int selinux_inode_init_security(struct inode *inode, struct inode *dir,
                                        char **name, void **value,
                                        size_t *len)
 {
-        const struct cred *cred = current_cred();
-        const struct task_security_struct *tsec = cred->security;
+        const struct task_security_struct *tsec = current_security();
         struct inode_security_struct *dsec;
         struct superblock_security_struct *sbsec;
         u32 sid, newsid, clen;
@@ -2676,14 +2626,26 @@ static int selinux_inode_follow_link(struct dentry *dentry, struct nameidata *na
 static int selinux_inode_permission(struct inode *inode, int mask)
 {
         const struct cred *cred = current_cred();
+        struct common_audit_data ad;
+        u32 perms;
+        bool from_access;
 
-        if (!mask) {
-                /* No permission to check.  Existence test. */
+        from_access = mask & MAY_ACCESS;
+        mask &= (MAY_READ|MAY_WRITE|MAY_EXEC|MAY_APPEND);
+
+        /* No permission to check.  Existence test. */
+        if (!mask)
                 return 0;
-        }
 
-        return inode_has_perm(cred, inode,
-                              file_mask_to_av(inode->i_mode, mask), NULL);
+        COMMON_AUDIT_DATA_INIT(&ad, FS);
+        ad.u.fs.inode = inode;
+
+        if (from_access)
+                ad.selinux_audit_data.auditdeny |= FILE__AUDIT_ACCESS;
+
+        perms = file_mask_to_av(inode->i_mode, mask);
+
+        return inode_has_perm(cred, inode, perms, &ad);
 }
 
 static int selinux_inode_setattr(struct dentry *dentry, struct iattr *iattr)
@@ -3671,71 +3633,54 @@ static int selinux_skb_peerlbl_sid(struct sk_buff *skb, u16 family, u32 *sid)
 }
 
 /* socket security operations */
-static int socket_has_perm(struct task_struct *task, struct socket *sock,
-                           u32 perms)
+
+static u32 socket_sockcreate_sid(const struct task_security_struct *tsec)
 {
-        struct inode_security_struct *isec;
-        struct common_audit_data ad;
-        u32 sid;
-        int err = 0;
+        return tsec->sockcreate_sid ? : tsec->sid;
+}
 
-        isec = SOCK_INODE(sock)->i_security;
+static int sock_has_perm(struct task_struct *task, struct sock *sk, u32 perms)
+{
+        struct sk_security_struct *sksec = sk->sk_security;
+        struct common_audit_data ad;
+        u32 tsid = task_sid(task);
 
-        if (isec->sid == SECINITSID_KERNEL)
-                goto out;
-        sid = task_sid(task);
+        if (sksec->sid == SECINITSID_KERNEL)
+                return 0;
 
         COMMON_AUDIT_DATA_INIT(&ad, NET);
-        ad.u.net.sk = sock->sk;
-        err = avc_has_perm(sid, isec->sid, isec->sclass, perms, &ad);
+        ad.u.net.sk = sk;
 
-out:
-        return err;
+        return avc_has_perm(tsid, sksec->sid, sksec->sclass, perms, &ad);
 }
 
 static int selinux_socket_create(int family, int type,
                                  int protocol, int kern)
 {
-        const struct cred *cred = current_cred();
-        const struct task_security_struct *tsec = cred->security;
-        u32 sid, newsid;
+        const struct task_security_struct *tsec = current_security();
+        u32 newsid;
         u16 secclass;
-        int err = 0;
 
         if (kern)
-                goto out;
-
-        sid = tsec->sid;
-        newsid = tsec->sockcreate_sid ?: sid;
+                return 0;
 
+        newsid = socket_sockcreate_sid(tsec);
         secclass = socket_type_to_security_class(family, type, protocol);
-        err = avc_has_perm(sid, newsid, secclass, SOCKET__CREATE, NULL);
-
-out:
-        return err;
+        return avc_has_perm(tsec->sid, newsid, secclass, SOCKET__CREATE, NULL);
 }
 
 static int selinux_socket_post_create(struct socket *sock, int family,
                                       int type, int protocol, int kern)
 {
-        const struct cred *cred = current_cred();
-        const struct task_security_struct *tsec = cred->security;
-        struct inode_security_struct *isec;
+        const struct task_security_struct *tsec = current_security();
+        struct inode_security_struct *isec = SOCK_INODE(sock)->i_security;
         struct sk_security_struct *sksec;
-        u32 sid, newsid;
         int err = 0;
 
-        sid = tsec->sid;
-        newsid = tsec->sockcreate_sid;
-
-        isec = SOCK_INODE(sock)->i_security;
-
         if (kern)
                 isec->sid = SECINITSID_KERNEL;
-        else if (newsid)
-                isec->sid = newsid;
         else
-                isec->sid = sid;
+                isec->sid = socket_sockcreate_sid(tsec);
 
         isec->sclass = socket_type_to_security_class(family, type, protocol);
         isec->initialized = 1;
@@ -3756,10 +3701,11 @@ static int selinux_socket_post_create(struct socket *sock, int family,
 
 static int selinux_socket_bind(struct socket *sock, struct sockaddr *address, int addrlen)
 {
+        struct sock *sk = sock->sk;
         u16 family;
         int err;
 
-        err = socket_has_perm(current, sock, SOCKET__BIND);
+        err = sock_has_perm(current, sk, SOCKET__BIND);
         if (err)
                 goto out;
 
@@ -3768,19 +3714,16 @@ static int selinux_socket_bind(struct socket *sock, struct sockaddr *address, in
          * Multiple address binding for SCTP is not supported yet: we just
          * check the first address now.
          */
-        family = sock->sk->sk_family;
+        family = sk->sk_family;
         if (family == PF_INET || family == PF_INET6) {
                 char *addrp;
-                struct inode_security_struct *isec;
+                struct sk_security_struct *sksec = sk->sk_security;
                 struct common_audit_data ad;
                 struct sockaddr_in *addr4 = NULL;
                 struct sockaddr_in6 *addr6 = NULL;
                 unsigned short snum;
-                struct sock *sk = sock->sk;
                 u32 sid, node_perm;
 
-                isec = SOCK_INODE(sock)->i_security;
-
                 if (family == PF_INET) {
                         addr4 = (struct sockaddr_in *)address;
                         snum = ntohs(addr4->sin_port);
@@ -3804,15 +3747,15 @@ static int selinux_socket_bind(struct socket *sock, struct sockaddr *address, in
                                 COMMON_AUDIT_DATA_INIT(&ad, NET);
                                 ad.u.net.sport = htons(snum);
                                 ad.u.net.family = family;
-                                err = avc_has_perm(isec->sid, sid,
-                                                   isec->sclass,
+                                err = avc_has_perm(sksec->sid, sid,
+                                                   sksec->sclass,
                                                    SOCKET__NAME_BIND, &ad);
                                 if (err)
                                         goto out;
                         }
                 }
 
-                switch (isec->sclass) {
+                switch (sksec->sclass) {
                 case SECCLASS_TCP_SOCKET:
                         node_perm = TCP_SOCKET__NODE_BIND;
                         break;
@@ -3843,8 +3786,8 @@ static int selinux_socket_bind(struct socket *sock, struct sockaddr *address, in
                 else
                         ipv6_addr_copy(&ad.u.net.v6info.saddr, &addr6->sin6_addr);
 
-                err = avc_has_perm(isec->sid, sid,
-                                   isec->sclass, node_perm, &ad);
+                err = avc_has_perm(sksec->sid, sid,
+                                   sksec->sclass, node_perm, &ad);
                 if (err)
                         goto out;
         }
@@ -3855,19 +3798,18 @@ out:
 static int selinux_socket_connect(struct socket *sock, struct sockaddr *address, int addrlen)
 {
         struct sock *sk = sock->sk;
-        struct inode_security_struct *isec;
+        struct sk_security_struct *sksec = sk->sk_security;
         int err;
 
-        err = socket_has_perm(current, sock, SOCKET__CONNECT);
+        err = sock_has_perm(current, sk, SOCKET__CONNECT);
         if (err)
                 return err;
 
         /*
          * If a TCP or DCCP socket, check name_connect permission for the port.
          */
-        isec = SOCK_INODE(sock)->i_security;
-        if (isec->sclass == SECCLASS_TCP_SOCKET ||
-            isec->sclass == SECCLASS_DCCP_SOCKET) {
+        if (sksec->sclass == SECCLASS_TCP_SOCKET ||
+            sksec->sclass == SECCLASS_DCCP_SOCKET) {
                 struct common_audit_data ad;
                 struct sockaddr_in *addr4 = NULL;
                 struct sockaddr_in6 *addr6 = NULL;
@@ -3890,13 +3832,13 @@ static int selinux_socket_connect(struct socket *sock, struct sockaddr *address,
                 if (err)
                         goto out;
 
-                perm = (isec->sclass == SECCLASS_TCP_SOCKET) ?
+                perm = (sksec->sclass == SECCLASS_TCP_SOCKET) ?
                        TCP_SOCKET__NAME_CONNECT : DCCP_SOCKET__NAME_CONNECT;
 
                 COMMON_AUDIT_DATA_INIT(&ad, NET);
                 ad.u.net.dport = htons(snum);
                 ad.u.net.family = sk->sk_family;
-                err = avc_has_perm(isec->sid, sid, isec->sclass, perm, &ad);
+                err = avc_has_perm(sksec->sid, sid, sksec->sclass, perm, &ad);
                 if (err)
                         goto out;
         }
@@ -3909,7 +3851,7 @@ out:
 
 static int selinux_socket_listen(struct socket *sock, int backlog)
 {
-        return socket_has_perm(current, sock, SOCKET__LISTEN);
+        return sock_has_perm(current, sock->sk, SOCKET__LISTEN);
 }
 
 static int selinux_socket_accept(struct socket *sock, struct socket *newsock)
@@ -3918,7 +3860,7 @@ static int selinux_socket_accept(struct socket *sock, struct socket *newsock)
         struct inode_security_struct *isec;
         struct inode_security_struct *newisec;
 
-        err = socket_has_perm(current, sock, SOCKET__ACCEPT);
+        err = sock_has_perm(current, sock->sk, SOCKET__ACCEPT);
         if (err)
                 return err;
 
@@ -3935,30 +3877,30 @@ static int selinux_socket_accept(struct socket *sock, struct socket *newsock)
 static int selinux_socket_sendmsg(struct socket *sock, struct msghdr *msg,
                                   int size)
 {
-        return socket_has_perm(current, sock, SOCKET__WRITE);
+        return sock_has_perm(current, sock->sk, SOCKET__WRITE);
 }
 
 static int selinux_socket_recvmsg(struct socket *sock, struct msghdr *msg,
                                   int size, int flags)
 {
-        return socket_has_perm(current, sock, SOCKET__READ);
+        return sock_has_perm(current, sock->sk, SOCKET__READ);
 }
 
 static int selinux_socket_getsockname(struct socket *sock)
 {
-        return socket_has_perm(current, sock, SOCKET__GETATTR);
+        return sock_has_perm(current, sock->sk, SOCKET__GETATTR);
 }
 
 static int selinux_socket_getpeername(struct socket *sock)
 {
-        return socket_has_perm(current, sock, SOCKET__GETATTR);
+        return sock_has_perm(current, sock->sk, SOCKET__GETATTR);
 }
 
 static int selinux_socket_setsockopt(struct socket *sock, int level, int optname)
 {
         int err;
 
-        err = socket_has_perm(current, sock, SOCKET__SETOPT);
+        err = sock_has_perm(current, sock->sk, SOCKET__SETOPT);
         if (err)
                 return err;
 
@@ -3968,68 +3910,58 @@ static int selinux_socket_setsockopt(struct socket *sock, int level, int optname
 static int selinux_socket_getsockopt(struct socket *sock, int level,
                                      int optname)
 {
-        return socket_has_perm(current, sock, SOCKET__GETOPT);
+        return sock_has_perm(current, sock->sk, SOCKET__GETOPT);
 }
 
 static int selinux_socket_shutdown(struct socket *sock, int how)
 {
-        return socket_has_perm(current, sock, SOCKET__SHUTDOWN);
+        return sock_has_perm(current, sock->sk, SOCKET__SHUTDOWN);
 }
 
 static int selinux_socket_unix_stream_connect(struct socket *sock,
                                               struct socket *other,
                                               struct sock *newsk)
 {
-        struct sk_security_struct *sksec;
-        struct inode_security_struct *isec;
-        struct inode_security_struct *other_isec;
+        struct sk_security_struct *sksec_sock = sock->sk->sk_security;
+        struct sk_security_struct *sksec_other = other->sk->sk_security;
+        struct sk_security_struct *sksec_new = newsk->sk_security;
         struct common_audit_data ad;
         int err;
 
-        isec = SOCK_INODE(sock)->i_security;
-        other_isec = SOCK_INODE(other)->i_security;
-
         COMMON_AUDIT_DATA_INIT(&ad, NET);
         ad.u.net.sk = other->sk;
 
-        err = avc_has_perm(isec->sid, other_isec->sid,
-                           isec->sclass,
+        err = avc_has_perm(sksec_sock->sid, sksec_other->sid,
+                           sksec_other->sclass,
                            UNIX_STREAM_SOCKET__CONNECTTO, &ad);
         if (err)
                 return err;
 
-        /* connecting socket */
-        sksec = sock->sk->sk_security;
-        sksec->peer_sid = other_isec->sid;
-
         /* server child socket */
-        sksec = newsk->sk_security;
-        sksec->peer_sid = isec->sid;
-        err = security_sid_mls_copy(other_isec->sid, sksec->peer_sid, &sksec->sid);
+        sksec_new->peer_sid = sksec_sock->sid;
+        err = security_sid_mls_copy(sksec_other->sid, sksec_sock->sid,
+                                    &sksec_new->sid);
+        if (err)
+                return err;
 
-        return err;
+        /* connecting socket */
+        sksec_sock->peer_sid = sksec_new->sid;
+
+        return 0;
 }
 
 static int selinux_socket_unix_may_send(struct socket *sock,
                                         struct socket *other)
 {
-        struct inode_security_struct *isec;
-        struct inode_security_struct *other_isec;
+        struct sk_security_struct *ssec = sock->sk->sk_security;
+        struct sk_security_struct *osec = other->sk->sk_security;
         struct common_audit_data ad;
-        int err;
-
-        isec = SOCK_INODE(sock)->i_security;
-        other_isec = SOCK_INODE(other)->i_security;
 
         COMMON_AUDIT_DATA_INIT(&ad, NET);
         ad.u.net.sk = other->sk;
 
-        err = avc_has_perm(isec->sid, other_isec->sid,
-                           isec->sclass, SOCKET__SENDTO, &ad);
-        if (err)
-                return err;
-
-        return 0;
+        return avc_has_perm(ssec->sid, osec->sid, osec->sclass, SOCKET__SENDTO,
+                            &ad);
 }
 
 static int selinux_inet_sys_rcv_skb(int ifindex, char *addrp, u16 family,
@@ -4168,26 +4100,18 @@ static int selinux_socket_getpeersec_stream(struct socket *sock, char __user *op
         int err = 0;
         char *scontext;
         u32 scontext_len;
-        struct sk_security_struct *sksec;
-        struct inode_security_struct *isec;
+        struct sk_security_struct *sksec = sock->sk->sk_security;
         u32 peer_sid = SECSID_NULL;
 
-        isec = SOCK_INODE(sock)->i_security;
-
-        if (isec->sclass == SECCLASS_UNIX_STREAM_SOCKET ||
-            isec->sclass == SECCLASS_TCP_SOCKET) {
-                sksec = sock->sk->sk_security;
+        if (sksec->sclass == SECCLASS_UNIX_STREAM_SOCKET ||
+            sksec->sclass == SECCLASS_TCP_SOCKET)
                 peer_sid = sksec->peer_sid;
-        }
-        if (peer_sid == SECSID_NULL) {
-                err = -ENOPROTOOPT;
-                goto out;
-        }
+        if (peer_sid == SECSID_NULL)
+                return -ENOPROTOOPT;
 
         err = security_sid_to_context(peer_sid, &scontext, &scontext_len);
-
         if (err)
-                goto out;
+                return err;
 
         if (scontext_len > len) {
                 err = -ERANGE;
@@ -4200,9 +4124,7 @@ static int selinux_socket_getpeersec_stream(struct socket *sock, char __user *op
 out_len:
         if (put_user(scontext_len, optlen))
                 err = -EFAULT;
-
         kfree(scontext);
-out:
         return err;
 }
 
@@ -4234,12 +4156,27 @@ out:
 
 static int selinux_sk_alloc_security(struct sock *sk, int family, gfp_t priority)
 {
-        return sk_alloc_security(sk, family, priority);
+        struct sk_security_struct *sksec;
+
+        sksec = kzalloc(sizeof(*sksec), priority);
+        if (!sksec)
+                return -ENOMEM;
+
+        sksec->peer_sid = SECINITSID_UNLABELED;
+        sksec->sid = SECINITSID_UNLABELED;
+        selinux_netlbl_sk_security_reset(sksec);
+        sk->sk_security = sksec;
+
+        return 0;
 }
 
 static void selinux_sk_free_security(struct sock *sk)
 {
-        sk_free_security(sk);
+        struct sk_security_struct *sksec = sk->sk_security;
+
+        sk->sk_security = NULL;
+        selinux_netlbl_sk_security_free(sksec);
+        kfree(sksec);
 }
 
 static void selinux_sk_clone_security(const struct sock *sk, struct sock *newsk)
@@ -4399,8 +4336,7 @@ static int selinux_nlmsg_perm(struct sock *sk, struct sk_buff *skb)
         int err = 0;
         u32 perm;
         struct nlmsghdr *nlh;
-        struct socket *sock = sk->sk_socket;
-        struct inode_security_struct *isec = SOCK_INODE(sock)->i_security;
+        struct sk_security_struct *sksec = sk->sk_security;
 
         if (skb->len < NLMSG_SPACE(0)) {
                 err = -EINVAL;
@@ -4408,13 +4344,13 @@ static int selinux_nlmsg_perm(struct sock *sk, struct sk_buff *skb)
         }
         nlh = nlmsg_hdr(skb);
 
-        err = selinux_nlmsg_lookup(isec->sclass, nlh->nlmsg_type, &perm);
+        err = selinux_nlmsg_lookup(sksec->sclass, nlh->nlmsg_type, &perm);
         if (err) {
                 if (err == -EINVAL) {
                         audit_log(current->audit_context, GFP_KERNEL, AUDIT_SELINUX_ERR,
                                   "SELinux:  unrecognized netlink message"
                                   " type=%hu for sclass=%hu\n",
-                                  nlh->nlmsg_type, isec->sclass);
+                                  nlh->nlmsg_type, sksec->sclass);
                         if (!selinux_enforcing || security_get_allow_unknown())
                                 err = 0;
                 }
@@ -4425,7 +4361,7 @@ static int selinux_nlmsg_perm(struct sock *sk, struct sk_buff *skb)
                 goto out;
         }
 
-        err = socket_has_perm(current, sock, perm);
+        err = sock_has_perm(current, sk, perm);
 out:
         return err;
 }