Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / fs / ext4 / xattr_security.c

diff --git a/kernel/fs/ext4/xattr_security.c b/kernel/fs/ext4/xattr_security.c
new file mode 100644 (file)
index 0000000..95d90e0
--- /dev/null
+++ b/kernel/fs/ext4/xattr_security.c
@@ -0,0 +1,82 @@
+/*
+ * linux/fs/ext4/xattr_security.c
+ * Handler for storing security labels as extended attributes.
+ */
+
+#include <linux/string.h>
+#include <linux/fs.h>
+#include <linux/security.h>
+#include <linux/slab.h>
+#include "ext4_jbd2.h"
+#include "ext4.h"
+#include "xattr.h"
+
+static size_t
+ext4_xattr_security_list(struct dentry *dentry, char *list, size_t list_size,
+               const char *name, size_t name_len, int type)
+{
+       const size_t prefix_len = sizeof(XATTR_SECURITY_PREFIX)-1;
+       const size_t total_len = prefix_len + name_len + 1;
+
+
+       if (list && total_len <= list_size) {
+               memcpy(list, XATTR_SECURITY_PREFIX, prefix_len);
+               memcpy(list+prefix_len, name, name_len);
+               list[prefix_len + name_len] = '\0';
+       }
+       return total_len;
+}
+
+static int
+ext4_xattr_security_get(struct dentry *dentry, const char *name,
+                      void *buffer, size_t size, int type)
+{
+       if (strcmp(name, "") == 0)
+               return -EINVAL;
+       return ext4_xattr_get(d_inode(dentry), EXT4_XATTR_INDEX_SECURITY,
+                             name, buffer, size);
+}
+
+static int
+ext4_xattr_security_set(struct dentry *dentry, const char *name,
+               const void *value, size_t size, int flags, int type)
+{
+       if (strcmp(name, "") == 0)
+               return -EINVAL;
+       return ext4_xattr_set(d_inode(dentry), EXT4_XATTR_INDEX_SECURITY,
+                             name, value, size, flags);
+}
+
+static int
+ext4_initxattrs(struct inode *inode, const struct xattr *xattr_array,
+               void *fs_info)
+{
+       const struct xattr *xattr;
+       handle_t *handle = fs_info;
+       int err = 0;
+
+       for (xattr = xattr_array; xattr->name != NULL; xattr++) {
+               err = ext4_xattr_set_handle(handle, inode,
+                                           EXT4_XATTR_INDEX_SECURITY,
+                                           xattr->name, xattr->value,
+                                           xattr->value_len, 0);
+               if (err < 0)
+                       break;
+       }
+       return err;
+}
+
+int
+ext4_init_security(handle_t *handle, struct inode *inode, struct inode *dir,
+                  const struct qstr *qstr)
+{
+       return security_inode_init_security(inode, dir, qstr,
+                                           &ext4_initxattrs, handle);
+}
+
+const struct xattr_handler ext4_xattr_security_handler = {
+       .prefix = XATTR_SECURITY_PREFIX,
+       .list   = ext4_xattr_security_list,
+       .get    = ext4_xattr_security_get,
+       .set    = ext4_xattr_security_set,
+};