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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/slab.h> |
16 | #include <linux/string.h> |
17 | #include <linux/vmalloc.h> |
18 | |
19 | #include "include/audit.h" |
20 | |
21 | |
22 | /** |
23 | * aa_split_fqname - split a fqname into a profile and namespace name |
24 | * @fqname: a full qualified name in namespace profile format (NOT NULL) |
25 | * @ns_name: pointer to portion of the string containing the ns name (NOT NULL) |
26 | * |
27 | * Returns: profile name or NULL if one is not specified |
28 | * |
29 | * Split a namespace name from a profile name (see policy.c for naming |
30 | * description). If a portion of the name is missing it returns NULL for |
31 | * that portion. |
32 | * |
33 | * NOTE: may modify the @fqname string. The pointers returned point |
34 | * into the @fqname string. |
35 | */ |
36 | char *aa_split_fqname(char *fqname, char **ns_name) |
37 | { |
38 | char *name = strim(fqname); |
39 | |
40 | *ns_name = NULL; |
41 | if (name[0] == ':') { |
42 | char *split = strchr(&name[1], ':'); |
43 | *ns_name = skip_spaces(&name[1]); |
44 | if (split) { |
45 | /* overwrite ':' with \0 */ |
46 | *split = 0; |
47 | name = skip_spaces(split + 1); |
48 | } else |
49 | /* a ns name without a following profile is allowed */ |
50 | name = NULL; |
51 | } |
52 | if (name && *name == 0) |
53 | name = NULL; |
54 | |
55 | return name; |
56 | } |
57 | |
58 | /** |
59 | * aa_info_message - log a none profile related status message |
60 | * @str: message to log |
61 | */ |
62 | void aa_info_message(const char *str) |
63 | { |
64 | if (audit_enabled) { |
65 | struct common_audit_data sa; |
66 | COMMON_AUDIT_DATA_INIT(&sa, NONE); |
67 | sa.aad.info = str; |
68 | aa_audit_msg(AUDIT_APPARMOR_STATUS, &sa, NULL); |
69 | } |
70 | printk(KERN_INFO "AppArmor: %s\n", str); |
71 | } |
72 | |
73 | /** |
74 | * kvmalloc - do allocation preferring kmalloc but falling back to vmalloc |
75 | * @size: size of allocation |
76 | * |
77 | * Return: allocated buffer or NULL if failed |
78 | * |
79 | * It is possible that policy being loaded from the user is larger than |
80 | * what can be allocated by kmalloc, in those cases fall back to vmalloc. |
81 | */ |
82 | void *kvmalloc(size_t size) |
83 | { |
84 | void *buffer = NULL; |
85 | |
86 | if (size == 0) |
87 | return NULL; |
88 | |
89 | /* do not attempt kmalloc if we need more than 16 pages at once */ |
90 | if (size <= (16*PAGE_SIZE)) |
91 | buffer = kmalloc(size, GFP_NOIO | __GFP_NOWARN); |
92 | if (!buffer) { |
93 | /* see kvfree for why size must be at least work_struct size |
94 | * when allocated via vmalloc |
95 | */ |
96 | if (size < sizeof(struct work_struct)) |
97 | size = sizeof(struct work_struct); |
98 | buffer = vmalloc(size); |
99 | } |
100 | return buffer; |
101 | } |
102 | |
103 | /** |
104 | * do_vfree - workqueue routine for freeing vmalloced memory |
105 | * @work: data to be freed |
106 | * |
107 | * The work_struct is overlaid to the data being freed, as at the point |
108 | * the work is scheduled the data is no longer valid, be its freeing |
109 | * needs to be delayed until safe. |
110 | */ |
111 | static void do_vfree(struct work_struct *work) |
112 | { |
113 | vfree(work); |
114 | } |
115 | |
116 | /** |
117 | * kvfree - free an allocation do by kvmalloc |
118 | * @buffer: buffer to free (MAYBE_NULL) |
119 | * |
120 | * Free a buffer allocated by kvmalloc |
121 | */ |
122 | void kvfree(void *buffer) |
123 | { |
124 | if (is_vmalloc_addr(buffer)) { |
125 | /* Data is no longer valid so just use the allocated space |
126 | * as the work_struct |
127 | */ |
128 | struct work_struct *work = (struct work_struct *) buffer; |
129 | INIT_WORK(work, do_vfree); |
130 | schedule_work(work); |
131 | } else |
132 | kfree(buffer); |
133 | } |
134 |
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