7 files changed, 182 insertions, 3 deletions

diff --git a/fs/9p/Kconfig b/fs/9p/Kconfig
index 55abfd62654a..6489e1fc1afd 100644
--- a/fs/9p/Kconfig
+++ b/fs/9p/Kconfig
@@ -31,3 +31,16 @@ config 9P_FS_POSIX_ACL
           If you don't know what Access Control Lists are, say N
 
 endif
+
+
+config 9P_FS_SECURITY
+        bool "9P Security Labels"
+        depends on 9P_FS
+        help
+          Security labels support alternative access control models
+          implemented by security modules like SELinux.  This option
+          enables an extended attribute handler for file security
+          labels in the 9P filesystem.
+
+          If you are not using a security module that requires using
+          extended attributes for file security labels, say N.
diff --git a/fs/9p/Makefile b/fs/9p/Makefile
index ab8c12780634..ff7be98f84f2 100644
--- a/fs/9p/Makefile
+++ b/fs/9p/Makefile
@@ -11,7 +11,9 @@ obj-$(CONFIG_9P_FS) := 9p.o
         v9fs.o \
         fid.o  \
         xattr.o \
-        xattr_user.o
+        xattr_user.o \
+        xattr_trusted.o
 
 9p-$(CONFIG_9P_FSCACHE) += cache.o
 9p-$(CONFIG_9P_FS_POSIX_ACL) += acl.o
+9p-$(CONFIG_9P_FS_SECURITY) += xattr_security.o
diff --git a/fs/9p/vfs_inode.c b/fs/9p/vfs_inode.c
index d86edc8d3fd0..25b018efb8ab 100644
--- a/fs/9p/vfs_inode.c
+++ b/fs/9p/vfs_inode.c
@@ -1054,13 +1054,11 @@ static int
 v9fs_vfs_getattr(struct vfsmount *mnt, struct dentry *dentry,
                  struct kstat *stat)
 {
-        int err;
         struct v9fs_session_info *v9ses;
         struct p9_fid *fid;
         struct p9_wstat *st;
 
         p9_debug(P9_DEBUG_VFS, "dentry: %p\n", dentry);
-        err = -EPERM;
         v9ses = v9fs_dentry2v9ses(dentry);
         if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
                 generic_fillattr(dentry->d_inode, stat);
diff --git a/fs/9p/xattr.c b/fs/9p/xattr.c
index c45e016b190f..3c28cdfb8c47 100644
--- a/fs/9p/xattr.c
+++ b/fs/9p/xattr.c
@@ -167,9 +167,13 @@ ssize_t v9fs_listxattr(struct dentry *dentry, char *buffer, size_t buffer_size)
 
 const struct xattr_handler *v9fs_xattr_handlers[] = {
         &v9fs_xattr_user_handler,
+        &v9fs_xattr_trusted_handler,
 #ifdef CONFIG_9P_FS_POSIX_ACL
         &v9fs_xattr_acl_access_handler,
         &v9fs_xattr_acl_default_handler,
 #endif
+#ifdef CONFIG_9P_FS_SECURITY
+        &v9fs_xattr_security_handler,
+#endif
         NULL
 };
diff --git a/fs/9p/xattr.h b/fs/9p/xattr.h
index eec348a3df71..d3e2ea3840be 100644
--- a/fs/9p/xattr.h
+++ b/fs/9p/xattr.h
@@ -20,6 +20,8 @@
 
 extern const struct xattr_handler *v9fs_xattr_handlers[];
 extern struct xattr_handler v9fs_xattr_user_handler;
+extern struct xattr_handler v9fs_xattr_trusted_handler;
+extern struct xattr_handler v9fs_xattr_security_handler;
 extern const struct xattr_handler v9fs_xattr_acl_access_handler;
 extern const struct xattr_handler v9fs_xattr_acl_default_handler;
 
diff --git a/fs/9p/xattr_security.c b/fs/9p/xattr_security.c
new file mode 100644
index 000000000000..cb247a142a6e
--- /dev/null
+++ b/fs/9p/xattr_security.c
@@ -0,0 +1,80 @@
+/*
+ * Copyright IBM Corporation, 2010
+ * Author Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of version 2.1 of the GNU Lesser General Public License
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it would be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ */
+
+
+#include <linux/module.h>
+#include <linux/string.h>
+#include <linux/fs.h>
+#include <linux/slab.h>
+#include "xattr.h"
+
+static int v9fs_xattr_security_get(struct dentry *dentry, const char *name,
+                        void *buffer, size_t size, int type)
+{
+        int retval;
+        char *full_name;
+        size_t name_len;
+        size_t prefix_len = XATTR_SECURITY_PREFIX_LEN;
+
+        if (name == NULL)
+                return -EINVAL;
+
+        if (strcmp(name, "") == 0)
+                return -EINVAL;
+
+        name_len = strlen(name);
+        full_name = kmalloc(prefix_len + name_len + 1 , GFP_KERNEL);
+        if (!full_name)
+                return -ENOMEM;
+        memcpy(full_name, XATTR_SECURITY_PREFIX, prefix_len);
+        memcpy(full_name+prefix_len, name, name_len);
+        full_name[prefix_len + name_len] = '\0';
+
+        retval = v9fs_xattr_get(dentry, full_name, buffer, size);
+        kfree(full_name);
+        return retval;
+}
+
+static int v9fs_xattr_security_set(struct dentry *dentry, const char *name,
+                        const void *value, size_t size, int flags, int type)
+{
+        int retval;
+        char *full_name;
+        size_t name_len;
+        size_t prefix_len = XATTR_SECURITY_PREFIX_LEN;
+
+        if (name == NULL)
+                return -EINVAL;
+
+        if (strcmp(name, "") == 0)
+                return -EINVAL;
+
+        name_len = strlen(name);
+        full_name = kmalloc(prefix_len + name_len + 1 , GFP_KERNEL);
+        if (!full_name)
+                return -ENOMEM;
+        memcpy(full_name, XATTR_SECURITY_PREFIX, prefix_len);
+        memcpy(full_name + prefix_len, name, name_len);
+        full_name[prefix_len + name_len] = '\0';
+
+        retval = v9fs_xattr_set(dentry, full_name, value, size, flags);
+        kfree(full_name);
+        return retval;
+}
+
+struct xattr_handler v9fs_xattr_security_handler = {
+        .prefix = XATTR_SECURITY_PREFIX,
+        .get    = v9fs_xattr_security_get,
+        .set    = v9fs_xattr_security_set,
+};
diff --git a/fs/9p/xattr_trusted.c b/fs/9p/xattr_trusted.c
new file mode 100644
index 000000000000..e30d33b8a3fb
--- /dev/null
+++ b/fs/9p/xattr_trusted.c
@@ -0,0 +1,80 @@
+/*
+ * Copyright IBM Corporation, 2010
+ * Author Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of version 2.1 of the GNU Lesser General Public License
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it would be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ */
+
+
+#include <linux/module.h>
+#include <linux/string.h>
+#include <linux/fs.h>
+#include <linux/slab.h>
+#include "xattr.h"
+
+static int v9fs_xattr_trusted_get(struct dentry *dentry, const char *name,
+                        void *buffer, size_t size, int type)
+{
+        int retval;
+        char *full_name;
+        size_t name_len;
+        size_t prefix_len = XATTR_TRUSTED_PREFIX_LEN;
+
+        if (name == NULL)
+                return -EINVAL;
+
+        if (strcmp(name, "") == 0)
+                return -EINVAL;
+
+        name_len = strlen(name);
+        full_name = kmalloc(prefix_len + name_len + 1 , GFP_KERNEL);
+        if (!full_name)
+                return -ENOMEM;
+        memcpy(full_name, XATTR_TRUSTED_PREFIX, prefix_len);
+        memcpy(full_name+prefix_len, name, name_len);
+        full_name[prefix_len + name_len] = '\0';
+
+        retval = v9fs_xattr_get(dentry, full_name, buffer, size);
+        kfree(full_name);
+        return retval;
+}
+
+static int v9fs_xattr_trusted_set(struct dentry *dentry, const char *name,
+                        const void *value, size_t size, int flags, int type)
+{
+        int retval;
+        char *full_name;
+        size_t name_len;
+        size_t prefix_len = XATTR_TRUSTED_PREFIX_LEN;
+
+        if (name == NULL)
+                return -EINVAL;
+
+        if (strcmp(name, "") == 0)
+                return -EINVAL;
+
+        name_len = strlen(name);
+        full_name = kmalloc(prefix_len + name_len + 1 , GFP_KERNEL);
+        if (!full_name)
+                return -ENOMEM;
+        memcpy(full_name, XATTR_TRUSTED_PREFIX, prefix_len);
+        memcpy(full_name + prefix_len, name, name_len);
+        full_name[prefix_len + name_len] = '\0';
+
+        retval = v9fs_xattr_set(dentry, full_name, value, size, flags);
+        kfree(full_name);
+        return retval;
+}
+
+struct xattr_handler v9fs_xattr_trusted_handler = {
+        .prefix = XATTR_TRUSTED_PREFIX,
+        .get    = v9fs_xattr_trusted_get,
+        .set    = v9fs_xattr_trusted_set,
+};