1 files changed, 22 insertions, 0 deletions

diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c
index ff81026f6ddb..b20ef0602267 100644
--- a/security/smack/smack_lsm.c
+++ b/security/smack/smack_lsm.c
@@ -1860,12 +1860,34 @@ static int smack_file_receive(struct file *file)
         int may = 0;
         struct smk_audit_info ad;
         struct inode *inode = file_inode(file);
+        struct socket *sock;
+        struct task_smack *tsp;
+        struct socket_smack *ssp;
 
         if (unlikely(IS_PRIVATE(inode)))
                 return 0;
 
         smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
         smk_ad_setfield_u_fs_path(&ad, file->f_path);
+
+        if (S_ISSOCK(inode->i_mode)) {
+                sock = SOCKET_I(inode);
+                ssp = sock->sk->sk_security;
+                tsp = current_security();
+                /*
+                 * If the receiving process can't write to the
+                 * passed socket or if the passed socket can't
+                 * write to the receiving process don't accept
+                 * the passed socket.
+                 */
+                rc = smk_access(tsp->smk_task, ssp->smk_out, MAY_WRITE, &ad);
+                rc = smk_bu_file(file, may, rc);
+                if (rc < 0)
+                        return rc;
+                rc = smk_access(ssp->smk_in, tsp->smk_task, MAY_WRITE, &ad);
+                rc = smk_bu_file(file, may, rc);
+                return rc;
+        }
         /*
          * This code relies on bitmasks.
          */