fs/reiserfs/xattr_trusted.c

   1 #include "reiserfs.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 "xattr.h"
   8 #include <linux/uaccess.h>
   9
  10 static int
  11 trusted_get(const struct xattr_handler *handler, struct dentry *dentry,
  12             const char *name, void *buffer, size_t size)
  13 {
  14         if (strlen(name) < sizeof(XATTR_TRUSTED_PREFIX))
  15                 return -EINVAL;
  16
  17         if (!capable(CAP_SYS_ADMIN) || IS_PRIVATE(d_inode(dentry)))
  18                 return -EPERM;
  19
  20         return reiserfs_xattr_get(d_inode(dentry), name, buffer, size);
  21 }
  22
  23 static int
  24 trusted_set(const struct xattr_handler *handler, struct dentry *dentry,
  25             const char *name, const void *buffer, size_t size, int flags)
  26 {
  27         if (strlen(name) < sizeof(XATTR_TRUSTED_PREFIX))
  28                 return -EINVAL;
  29
  30         if (!capable(CAP_SYS_ADMIN) || IS_PRIVATE(d_inode(dentry)))
  31                 return -EPERM;
  32
  33         return reiserfs_xattr_set(d_inode(dentry), name, buffer, size, flags);
  34 }
  35
  36 static bool trusted_list(struct dentry *dentry)
  37 {
  38         return capable(CAP_SYS_ADMIN) && !IS_PRIVATE(d_inode(dentry));
  39 }
  40
  41 const struct xattr_handler reiserfs_xattr_trusted_handler = {
  42         .prefix = XATTR_TRUSTED_PREFIX,
  43         .get = trusted_get,
  44         .set = trusted_set,
  45         .list = trusted_list,
  46 };