1/*
2 * AppArmor security module
3 *
4 * This file contains basic common functions used in AppArmor
5 *
6 * Copyright (C) 1998-2008 Novell/SUSE
7 * Copyright 2009-2010 Canonical Ltd.
8 *
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License as
11 * published by the Free Software Foundation, version 2 of the
12 * License.
13 */
14
15#include <linux/mm.h>
16#include <linux/slab.h>
17#include <linux/string.h>
18#include <linux/vmalloc.h>
19
20#include "include/audit.h"
21#include "include/apparmor.h"
22
23
24/**
25 * aa_split_fqname - split a fqname into a profile and namespace name
26 * @fqname: a full qualified name in namespace profile format (NOT NULL)
27 * @ns_name: pointer to portion of the string containing the ns name (NOT NULL)
28 *
29 * Returns: profile name or NULL if one is not specified
30 *
31 * Split a namespace name from a profile name (see policy.c for naming
32 * description).  If a portion of the name is missing it returns NULL for
33 * that portion.
34 *
35 * NOTE: may modify the @fqname string.  The pointers returned point
36 *       into the @fqname string.
37 */
38char *aa_split_fqname(char *fqname, char **ns_name)
39{
40	char *name = strim(fqname);
41
42	*ns_name = NULL;
43	if (name[0] == ':') {
44		char *split = strchr(&name[1], ':');
45		*ns_name = skip_spaces(&name[1]);
46		if (split) {
47			/* overwrite ':' with \0 */
48			*split++ = 0;
49			if (strncmp(split, "//", 2) == 0)
50				split += 2;
51			name = skip_spaces(split);
52		} else
53			/* a ns name without a following profile is allowed */
54			name = NULL;
55	}
56	if (name && *name == 0)
57		name = NULL;
58
59	return name;
60}
61
62/**
63 * aa_info_message - log a none profile related status message
64 * @str: message to log
65 */
66void aa_info_message(const char *str)
67{
68	if (audit_enabled) {
69		struct common_audit_data sa;
70		struct apparmor_audit_data aad = {0,};
71		sa.type = LSM_AUDIT_DATA_NONE;
72		sa.aad = &aad;
73		aad.info = str;
74		aa_audit_msg(AUDIT_APPARMOR_STATUS, &sa, NULL);
75	}
76	printk(KERN_INFO "AppArmor: %s\n", str);
77}
78
79/**
80 * __aa_kvmalloc - do allocation preferring kmalloc but falling back to vmalloc
81 * @size: how many bytes of memory are required
82 * @flags: the type of memory to allocate (see kmalloc).
83 *
84 * Return: allocated buffer or NULL if failed
85 *
86 * It is possible that policy being loaded from the user is larger than
87 * what can be allocated by kmalloc, in those cases fall back to vmalloc.
88 */
89void *__aa_kvmalloc(size_t size, gfp_t flags)
90{
91	void *buffer = NULL;
92
93	if (size == 0)
94		return NULL;
95
96	/* do not attempt kmalloc if we need more than 16 pages at once */
97	if (size <= (16*PAGE_SIZE))
98		buffer = kmalloc(size, flags | GFP_NOIO | __GFP_NOWARN);
99	if (!buffer) {
100		if (flags & __GFP_ZERO)
101			buffer = vzalloc(size);
102		else
103			buffer = vmalloc(size);
104	}
105	return buffer;
106}
107