106 lines
2.7 KiB
C
106 lines
2.7 KiB
C
/*
|
|
* 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;
|
|
}
|