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-rw-r--r--kernel/security/apparmor/lib.c106
1 files changed, 106 insertions, 0 deletions
diff --git a/kernel/security/apparmor/lib.c b/kernel/security/apparmor/lib.c
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+++ b/kernel/security/apparmor/lib.c
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+/*
+ * AppArmor security module
+ *
+ * This file contains basic common functions used in AppArmor
+ *
+ * Copyright (C) 1998-2008 Novell/SUSE
+ * Copyright 2009-2010 Canonical Ltd.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation, version 2 of the
+ * License.
+ */
+
+#include <linux/mm.h>
+#include <linux/slab.h>
+#include <linux/string.h>
+#include <linux/vmalloc.h>
+
+#include "include/audit.h"
+#include "include/apparmor.h"
+
+
+/**
+ * aa_split_fqname - split a fqname into a profile and namespace name
+ * @fqname: a full qualified name in namespace profile format (NOT NULL)
+ * @ns_name: pointer to portion of the string containing the ns name (NOT NULL)
+ *
+ * Returns: profile name or NULL if one is not specified
+ *
+ * Split a namespace name from a profile name (see policy.c for naming
+ * description). If a portion of the name is missing it returns NULL for
+ * that portion.
+ *
+ * NOTE: may modify the @fqname string. The pointers returned point
+ * into the @fqname string.
+ */
+char *aa_split_fqname(char *fqname, char **ns_name)
+{
+ char *name = strim(fqname);
+
+ *ns_name = NULL;
+ if (name[0] == ':') {
+ char *split = strchr(&name[1], ':');
+ *ns_name = skip_spaces(&name[1]);
+ if (split) {
+ /* overwrite ':' with \0 */
+ *split++ = 0;
+ if (strncmp(split, "//", 2) == 0)
+ split += 2;
+ name = skip_spaces(split);
+ } else
+ /* a ns name without a following profile is allowed */
+ name = NULL;
+ }
+ if (name && *name == 0)
+ name = NULL;
+
+ return name;
+}
+
+/**
+ * aa_info_message - log a none profile related status message
+ * @str: message to log
+ */
+void aa_info_message(const char *str)
+{
+ if (audit_enabled) {
+ struct common_audit_data sa;
+ struct apparmor_audit_data aad = {0,};
+ sa.type = LSM_AUDIT_DATA_NONE;
+ sa.aad = &aad;
+ aad.info = str;
+ aa_audit_msg(AUDIT_APPARMOR_STATUS, &sa, NULL);
+ }
+ printk(KERN_INFO "AppArmor: %s\n", str);
+}
+
+/**
+ * __aa_kvmalloc - do allocation preferring kmalloc but falling back to vmalloc
+ * @size: how many bytes of memory are required
+ * @flags: the type of memory to allocate (see kmalloc).
+ *
+ * Return: allocated buffer or NULL if failed
+ *
+ * It is possible that policy being loaded from the user is larger than
+ * what can be allocated by kmalloc, in those cases fall back to vmalloc.
+ */
+void *__aa_kvmalloc(size_t size, gfp_t flags)
+{
+ void *buffer = NULL;
+
+ if (size == 0)
+ return NULL;
+
+ /* do not attempt kmalloc if we need more than 16 pages at once */
+ if (size <= (16*PAGE_SIZE))
+ buffer = kmalloc(size, flags | GFP_NOIO | __GFP_NOWARN);
+ if (!buffer) {
+ if (flags & __GFP_ZERO)
+ buffer = vzalloc(size);
+ else
+ buffer = vmalloc(size);
+ }
+ return buffer;
+}