release/src-rt-6.x.4708/linux/linux-2.6.36/fs/reiserfs/xattr_trusted.c

   1 #include <linux/reiserfs_fs.h>
   2 #include <linux/capability.h>
   3 #include <linux/errno.h>
   4 #include <linux/fs.h>
   5 #include <linux/pagemap.h>
   6 #include <linux/xattr.h>
   7 #include <linux/reiserfs_xattr.h>
   8 #include <asm/uaccess.h>
   9
  10 static int
  11 trusted_get(struct dentry *dentry, const char *name, void *buffer, size_t size,
  12             int handler_flags)
  13 {
  14         if (strlen(name) < sizeof(XATTR_TRUSTED_PREFIX))
  15                 return -EINVAL;
  16
  17         if (!capable(CAP_SYS_ADMIN) || IS_PRIVATE(dentry->d_inode))
  18                 return -EPERM;
  19
  20         return reiserfs_xattr_get(dentry->d_inode, name, buffer, size);
  21 }
  22
  23 static int
  24 trusted_set(struct dentry *dentry, const char *name, const void *buffer,
  25             size_t size, int flags, int handler_flags)
  26 {
  27         if (strlen(name) < sizeof(XATTR_TRUSTED_PREFIX))
  28                 return -EINVAL;
  29
  30         if (!capable(CAP_SYS_ADMIN) || IS_PRIVATE(dentry->d_inode))
  31                 return -EPERM;
  32
  33         return reiserfs_xattr_set(dentry->d_inode, name, buffer, size, flags);
  34 }
  35
  36 static size_t trusted_list(struct dentry *dentry, char *list, size_t list_size,
  37                            const char *name, size_t name_len, int handler_flags)
  38 {
  39         const size_t len = name_len + 1;
  40
  41         if (!capable(CAP_SYS_ADMIN) || IS_PRIVATE(dentry->d_inode))
  42                 return 0;
  43
  44         if (list && len <= list_size) {
  45                 memcpy(list, name, name_len);
  46                 list[name_len] = '\0';
  47         }
  48         return len;
  49 }
  50
  51 const struct xattr_handler reiserfs_xattr_trusted_handler = {
  52         .prefix = XATTR_TRUSTED_PREFIX,
  53         .get = trusted_get,
  54         .set = trusted_set,
  55         .list = trusted_list,
  56 };