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Linux/fs/reiserfs/xattr_trusted.c

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  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(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 };
 57 

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