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/* SPDX-License-Identifier: GPL-2.0 */
/*
* This header provides generic wrappers for memory access instrumentation that
* the compiler cannot emit for: KASAN, KCSAN.
*/
#ifndef _LINUX_INSTRUMENTED_H
#define _LINUX_INSTRUMENTED_H
#include <linux/compiler.h>
#include <linux/kasan-checks.h>
#include <linux/kcsan-checks.h>
#include <linux/types.h>
/**
* instrument_read - instrument regular read access
*
* Instrument a regular read access. The instrumentation should be inserted
* before the actual read happens.
*
* @ptr address of access
* @size size of access
*/
static __always_inline void instrument_read(const volatile void *v, size_t size)
{
kasan_check_read(v, size);
kcsan_check_read(v, size);
}
/**
* instrument_write - instrument regular write access
*
* Instrument a regular write access. The instrumentation should be inserted
* before the actual write happens.
*
* @ptr address of access
* @size size of access
*/
static __always_inline void instrument_write(const volatile void *v, size_t size)
{
kasan_check_write(v, size);
kcsan_check_write(v, size);
}
/**
* instrument_atomic_read - instrument atomic read access
*
* Instrument an atomic read access. The instrumentation should be inserted
* before the actual read happens.
*
* @ptr address of access
* @size size of access
*/
static __always_inline void instrument_atomic_read(const volatile void *v, size_t size)
{
kasan_check_read(v, size);
kcsan_check_atomic_read(v, size);
}
/**
* instrument_atomic_write - instrument atomic write access
*
* Instrument an atomic write access. The instrumentation should be inserted
* before the actual write happens.
*
* @ptr address of access
* @size size of access
*/
static __always_inline void instrument_atomic_write(const volatile void *v, size_t size)
{
kasan_check_write(v, size);
kcsan_check_atomic_write(v, size);
}
/**
* instrument_copy_to_user - instrument reads of copy_to_user
*
* Instrument reads from kernel memory, that are due to copy_to_user (and
* variants). The instrumentation must be inserted before the accesses.
*
* @to destination address
* @from source address
* @n number of bytes to copy
*/
static __always_inline void
instrument_copy_to_user(void __user *to, const void *from, unsigned long n)
{
kasan_check_read(from, n);
kcsan_check_read(from, n);
}
/**
* instrument_copy_from_user - instrument writes of copy_from_user
*
* Instrument writes to kernel memory, that are due to copy_from_user (and
* variants). The instrumentation should be inserted before the accesses.
*
* @to destination address
* @from source address
* @n number of bytes to copy
*/
static __always_inline void
instrument_copy_from_user(const void *to, const void __user *from, unsigned long n)
{
kasan_check_write(to, n);
kcsan_check_write(to, n);
}
#endif /* _LINUX_INSTRUMENTED_H */
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