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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 name = skip_spaces(split + 1);
50 } else
51 /* a ns name without a following profile is allowed */
52 name = NULL;
53 }
54 if (name && *name == 0)
55 name = NULL;
56
57 return name;
58}
59
60/**
61 * aa_info_message - log a none profile related status message
62 * @str: message to log
63 */
64void aa_info_message(const char *str)
65{
66 if (audit_enabled) {
67 struct common_audit_data sa;
68 struct apparmor_audit_data aad = {0,};
69 sa.type = LSM_AUDIT_DATA_NONE;
70 sa.aad = &aad;
71 aad.info = str;
72 aa_audit_msg(AUDIT_APPARMOR_STATUS, &sa, NULL);
73 }
74 printk(KERN_INFO "AppArmor: %s\n", str);
75}
76
77/**
78 * kvmalloc - do allocation preferring kmalloc but falling back to vmalloc
79 * @size: size of allocation
80 *
81 * Return: allocated buffer or NULL if failed
82 *
83 * It is possible that policy being loaded from the user is larger than
84 * what can be allocated by kmalloc, in those cases fall back to vmalloc.
85 */
86void *kvmalloc(size_t size)
87{
88 void *buffer = NULL;
89
90 if (size == 0)
91 return NULL;
92
93 /* do not attempt kmalloc if we need more than 16 pages at once */
94 if (size <= (16*PAGE_SIZE))
95 buffer = kmalloc(size, GFP_NOIO | __GFP_NOWARN);
96 if (!buffer) {
97 /* see kvfree for why size must be at least work_struct size
98 * when allocated via vmalloc
99 */
100 if (size < sizeof(struct work_struct))
101 size = sizeof(struct work_struct);
102 buffer = vmalloc(size);
103 }
104 return buffer;
105}
106
107/**
108 * do_vfree - workqueue routine for freeing vmalloced memory
109 * @work: data to be freed
110 *
111 * The work_struct is overlaid to the data being freed, as at the point
112 * the work is scheduled the data is no longer valid, be its freeing
113 * needs to be delayed until safe.
114 */
115static void do_vfree(struct work_struct *work)
116{
117 vfree(work);
118}
119
120/**
121 * kvfree - free an allocation do by kvmalloc
122 * @buffer: buffer to free (MAYBE_NULL)
123 *
124 * Free a buffer allocated by kvmalloc
125 */
126void kvfree(void *buffer)
127{
128 if (is_vmalloc_addr(buffer)) {
129 /* Data is no longer valid so just use the allocated space
130 * as the work_struct
131 */
132 struct work_struct *work = (struct work_struct *) buffer;
133 INIT_WORK(work, do_vfree);
134 schedule_work(work);
135 } else
136 kfree(buffer);
137}
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}