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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 | */ |
38 | char *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 | */ |
66 | void 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 | */ |
89 | void *__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 | |
108 | /** |
109 | * kvfree - free an allocation do by kvmalloc |
110 | * @buffer: buffer to free (MAYBE_NULL) |
111 | * |
112 | * Free a buffer allocated by kvmalloc |
113 | */ |
114 | void kvfree(void *buffer) |
115 | { |
116 | if (is_vmalloc_addr(buffer)) |
117 | vfree(buffer); |
118 | else |
119 | kfree(buffer); |
120 | } |
121 |
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