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// SPDX-License-Identifier: GPL-2.0
/*
* KMSAN hooks for kernel subsystems.
*
* These functions handle creation of KMSAN metadata for memory allocations.
*
* Copyright (C) 2018-2022 Google LLC
* Author: Alexander Potapenko <glider@google.com>
*
*/
#include <linux/cacheflush.h>
#include <linux/gfp.h>
#include <linux/mm.h>
#include <linux/mm_types.h>
#include <linux/slab.h>
#include <linux/uaccess.h>
#include "../internal.h"
#include "../slab.h"
#include "kmsan.h"
/*
* Instrumented functions shouldn't be called under
* kmsan_enter_runtime()/kmsan_leave_runtime(), because this will lead to
* skipping effects of functions like memset() inside instrumented code.
*/
/* Functions from kmsan-checks.h follow. */
void kmsan_poison_memory(const void *address, size_t size, gfp_t flags)
{
if (!kmsan_enabled || kmsan_in_runtime())
return;
kmsan_enter_runtime();
/* The users may want to poison/unpoison random memory. */
kmsan_internal_poison_memory((void *)address, size, flags,
KMSAN_POISON_NOCHECK);
kmsan_leave_runtime();
}
EXPORT_SYMBOL(kmsan_poison_memory);
void kmsan_unpoison_memory(const void *address, size_t size)
{
unsigned long ua_flags;
if (!kmsan_enabled || kmsan_in_runtime())
return;
ua_flags = user_access_save();
kmsan_enter_runtime();
/* The users may want to poison/unpoison random memory. */
kmsan_internal_unpoison_memory((void *)address, size,
KMSAN_POISON_NOCHECK);
kmsan_leave_runtime();
user_access_restore(ua_flags);
}
EXPORT_SYMBOL(kmsan_unpoison_memory);
void kmsan_check_memory(const void *addr, size_t size)
{
if (!kmsan_enabled)
return;
return kmsan_internal_check_memory((void *)addr, size, /*user_addr*/ 0,
REASON_ANY);
}
EXPORT_SYMBOL(kmsan_check_memory);
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