/* * AppArmor security module * * This file contains basic common functions used in AppArmor * * Copyright (C) 1998-2008 Novell/SUSE * Copyright 2009-2010 Canonical Ltd. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License as * published by the Free Software Foundation, version 2 of the * License. */ #include <linux/mm.h>#include <linux/slab.h>#include <linux/string.h>#include <linux/vmalloc.h> #include "include/audit.h"#include "include/apparmor.h"  /** * aa_split_fqname - split a fqname into a profile and namespace name * @fqname: a full qualified name in namespace profile format (NOT NULL) * @ns_name: pointer to portion of the string containing the ns name (NOT NULL) * * Returns: profile name or NULL if one is not specified * * Split a namespace name from a profile name (see policy.c for naming * description).  If a portion of the name is missing it returns NULL for * that portion. * * NOTE: may modify the @fqname string.  The pointers returned point *       into the @fqname string. */char *aa_split_fqname(char *fqname, char **ns_name){	char *name = strim(fqname); 	*ns_name = NULL;	if (name[0] == ':') {		char *split = strchr(&name[1], ':');		*ns_name = skip_spaces(&name[1]);		if (split) {			/* overwrite ':' with \0 */			*split = 0;			name = skip_spaces(split + 1);		} else			/* a ns name without a following profile is allowed */			name = NULL;	}	if (name && *name == 0)		name = NULL; 	return name;} /** * aa_info_message - log a none profile related status message * @str: message to log */void aa_info_message(const char *str){	if (audit_enabled) {		struct common_audit_data sa;		COMMON_AUDIT_DATA_INIT(&sa, NONE);		sa.aad.info = str;		aa_audit_msg(AUDIT_APPARMOR_STATUS, &sa, NULL);	}	printk(KERN_INFO "AppArmor: %s\n", str);} /** * kvmalloc - do allocation preferring kmalloc but falling back to vmalloc * @size: size of allocation * * Return: allocated buffer or NULL if failed * * It is possible that policy being loaded from the user is larger than * what can be allocated by kmalloc, in those cases fall back to vmalloc. */void *kvmalloc(size_t size){	void *buffer = NULL; 	if (size == 0)		return NULL; 	/* do not attempt kmalloc if we need more than 16 pages at once */	if (size <= (16*PAGE_SIZE))		buffer = kmalloc(size, GFP_NOIO | __GFP_NOWARN);	if (!buffer) {		/* see kvfree for why size must be at least work_struct size		 * when allocated via vmalloc		 */		if (size < sizeof(struct work_struct))			size = sizeof(struct work_struct);		buffer = vmalloc(size);	}	return buffer;} /** * do_vfree - workqueue routine for freeing vmalloced memory * @work: data to be freed * * The work_struct is overlaid to the data being freed, as at the point * the work is scheduled the data is no longer valid, be its freeing * needs to be delayed until safe. */static void do_vfree(struct work_struct *work){	vfree(work);} /** * kvfree - free an allocation do by kvmalloc * @buffer: buffer to free (MAYBE_NULL) * * Free a buffer allocated by kvmalloc */void kvfree(void *buffer){	if (is_vmalloc_addr(buffer)) {		/* Data is no longer valid so just use the allocated space		 * as the work_struct		 */		struct work_struct *work = (struct work_struct *) buffer;		INIT_WORK(work, do_vfree);		schedule_work(work);	} else		kfree(buffer);}