mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-30 16:13:54 +08:00
04ccd53f09
As per Dan Carpenter <error27@gmail.com> If we have a ns name without a following profile then in the original code it did "*ns_name = &name[1];". "name" is NULL so "*ns_name" is 0x1. That isn't useful and could cause an oops when this function is called from aa_remove_profiles(). Beyond this the assignment of the namespace name was wrong in the case where the profile name was provided as it was being set to &name[1] after name = skip_spaces(split + 1); Move the ns_name assignment before updating name for the split and also add skip_spaces, making the interface more robust. Signed-off-by: John Johansen <john.johansen@canonical.com> Signed-off-by: James Morris <jmorris@namei.org>
134 lines
3.3 KiB
C
134 lines
3.3 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/slab.h>
|
|
#include <linux/string.h>
|
|
#include <linux/vmalloc.h>
|
|
|
|
#include "include/audit.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;
|
|
name = skip_spaces(split + 1);
|
|
} 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;
|
|
COMMON_AUDIT_DATA_INIT(&sa, NONE);
|
|
sa.aad.info = str;
|
|
aa_audit_msg(AUDIT_APPARMOR_STATUS, &sa, NULL);
|
|
}
|
|
printk(KERN_INFO "AppArmor: %s\n", str);
|
|
}
|
|
|
|
/**
|
|
* kvmalloc - do allocation preferring kmalloc but falling back to vmalloc
|
|
* @size: size of allocation
|
|
*
|
|
* 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 *kvmalloc(size_t size)
|
|
{
|
|
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, GFP_NOIO | __GFP_NOWARN);
|
|
if (!buffer) {
|
|
/* see kvfree for why size must be at least work_struct size
|
|
* when allocated via vmalloc
|
|
*/
|
|
if (size < sizeof(struct work_struct))
|
|
size = sizeof(struct work_struct);
|
|
buffer = vmalloc(size);
|
|
}
|
|
return buffer;
|
|
}
|
|
|
|
/**
|
|
* do_vfree - workqueue routine for freeing vmalloced memory
|
|
* @work: data to be freed
|
|
*
|
|
* The work_struct is overlaid to the data being freed, as at the point
|
|
* the work is scheduled the data is no longer valid, be its freeing
|
|
* needs to be delayed until safe.
|
|
*/
|
|
static void do_vfree(struct work_struct *work)
|
|
{
|
|
vfree(work);
|
|
}
|
|
|
|
/**
|
|
* kvfree - free an allocation do by kvmalloc
|
|
* @buffer: buffer to free (MAYBE_NULL)
|
|
*
|
|
* Free a buffer allocated by kvmalloc
|
|
*/
|
|
void kvfree(void *buffer)
|
|
{
|
|
if (is_vmalloc_addr(buffer)) {
|
|
/* Data is no longer valid so just use the allocated space
|
|
* as the work_struct
|
|
*/
|
|
struct work_struct *work = (struct work_struct *) buffer;
|
|
INIT_WORK(work, do_vfree);
|
|
schedule_work(work);
|
|
} else
|
|
kfree(buffer);
|
|
}
|