/* * linux/fs/ext2/xattr_trusted.c * Handler for trusted extended attributes. * * Copyright (C) 2003 by Andreas Gruenbacher, <a.gruenbacher@computer.org> */ #include <linux/module.h> #include <linux/string.h> #include <linux/capability.h> #include <linux/fs.h> #include <linux/smp_lock.h> #include <linux/ext2_fs.h> #include "xattr.h" #define XATTR_TRUSTED_PREFIX "trusted." static size_t ext2_xattr_trusted_list(struct inode *inode, char *list, size_t list_size, const char *name, size_t name_len) { const int prefix_len = sizeof(XATTR_TRUSTED_PREFIX)-1; const size_t total_len = prefix_len + name_len + 1; if (!capable(CAP_SYS_ADMIN)) return 0; if (list && total_len <= list_size) { memcpy(list, XATTR_TRUSTED_PREFIX, prefix_len); memcpy(list+prefix_len, name, name_len); list[prefix_len + name_len] = '\0'; } return total_len; } static int ext2_xattr_trusted_get(struct inode *inode, const char *name, void *buffer, size_t size) { if (strcmp(name, "") == 0) return -EINVAL; return ext2_xattr_get(inode, EXT2_XATTR_INDEX_TRUSTED, name, buffer, size); } static int ext2_xattr_trusted_set(struct inode *inode, const char *name, const void *value, size_t size, int flags) { if (strcmp(name, "") == 0) return -EINVAL; return ext2_xattr_set(inode, EXT2_XATTR_INDEX_TRUSTED, name, value, size, flags); } struct xattr_handler ext2_xattr_trusted_handler = { .prefix = XATTR_TRUSTED_PREFIX, .list = ext2_xattr_trusted_list, .get = ext2_xattr_trusted_get, .set = ext2_xattr_trusted_set, };