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Linux/fs/reiserfs/xattr_trusted.c

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  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 inode *inode, const char *name, void *buffer, size_t size)
 12 {
 13         if (strlen(name) < sizeof(XATTR_TRUSTED_PREFIX))
 14                 return -EINVAL;
 15 
 16         if (!capable(CAP_SYS_ADMIN) || IS_PRIVATE(inode))
 17                 return -EPERM;
 18 
 19         return reiserfs_xattr_get(inode, name, buffer, size);
 20 }
 21 
 22 static int
 23 trusted_set(struct inode *inode, const char *name, const void *buffer,
 24             size_t size, int flags)
 25 {
 26         if (strlen(name) < sizeof(XATTR_TRUSTED_PREFIX))
 27                 return -EINVAL;
 28 
 29         if (!capable(CAP_SYS_ADMIN) || IS_PRIVATE(inode))
 30                 return -EPERM;
 31 
 32         return reiserfs_xattr_set(inode, name, buffer, size, flags);
 33 }
 34 
 35 static size_t trusted_list(struct inode *inode, char *list, size_t list_size,
 36                            const char *name, size_t name_len)
 37 {
 38         const size_t len = name_len + 1;
 39 
 40         if (!capable(CAP_SYS_ADMIN) || IS_PRIVATE(inode))
 41                 return 0;
 42 
 43         if (list && len <= list_size) {
 44                 memcpy(list, name, name_len);
 45                 list[name_len] = '\0';
 46         }
 47         return len;
 48 }
 49 
 50 struct xattr_handler reiserfs_xattr_trusted_handler = {
 51         .prefix = XATTR_TRUSTED_PREFIX,
 52         .get = trusted_get,
 53         .set = trusted_set,
 54         .list = trusted_list,
 55 };
 56 

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