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cdff2642 JJ |
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], ':'); | |
04ccd53f | 43 | *ns_name = skip_spaces(&name[1]); |
cdff2642 JJ |
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; | |
cdff2642 JJ |
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 | } |