8bb227ac34
Remove address space overrides using set_fs() for User Mode Linux. Note that just like the existing kernel access case of the uaccess routines the new nofault kernel handlers do not actually have any exception handling. This is probably broken, but not change to the status quo. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Richard Weinberger <richard@nod.at>
63 lines
2 KiB
C
63 lines
2 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
/*
|
|
* Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
|
|
* Copyright (C) 2015 Richard Weinberger (richard@nod.at)
|
|
*/
|
|
|
|
#ifndef __UM_UACCESS_H
|
|
#define __UM_UACCESS_H
|
|
|
|
#include <asm/elf.h>
|
|
#include <asm/unaligned.h>
|
|
|
|
#define __under_task_size(addr, size) \
|
|
(((unsigned long) (addr) < TASK_SIZE) && \
|
|
(((unsigned long) (addr) + (size)) < TASK_SIZE))
|
|
|
|
#define __access_ok_vsyscall(addr, size) \
|
|
(((unsigned long) (addr) >= FIXADDR_USER_START) && \
|
|
((unsigned long) (addr) + (size) <= FIXADDR_USER_END) && \
|
|
((unsigned long) (addr) + (size) >= (unsigned long)(addr)))
|
|
|
|
#define __addr_range_nowrap(addr, size) \
|
|
((unsigned long) (addr) <= ((unsigned long) (addr) + (size)))
|
|
|
|
extern unsigned long raw_copy_from_user(void *to, const void __user *from, unsigned long n);
|
|
extern unsigned long raw_copy_to_user(void __user *to, const void *from, unsigned long n);
|
|
extern unsigned long __clear_user(void __user *mem, unsigned long len);
|
|
static inline int __access_ok(unsigned long addr, unsigned long size);
|
|
|
|
/* Teach asm-generic/uaccess.h that we have C functions for these. */
|
|
#define __access_ok __access_ok
|
|
#define __clear_user __clear_user
|
|
|
|
#define INLINE_COPY_FROM_USER
|
|
#define INLINE_COPY_TO_USER
|
|
|
|
#include <asm-generic/uaccess.h>
|
|
|
|
static inline int __access_ok(unsigned long addr, unsigned long size)
|
|
{
|
|
return __addr_range_nowrap(addr, size) &&
|
|
(__under_task_size(addr, size) ||
|
|
__access_ok_vsyscall(addr, size));
|
|
}
|
|
|
|
/* no pagefaults for kernel addresses in um */
|
|
#define HAVE_GET_KERNEL_NOFAULT 1
|
|
|
|
#define __get_kernel_nofault(dst, src, type, err_label) \
|
|
do { \
|
|
*((type *)dst) = get_unaligned((type *)(src)); \
|
|
if (0) /* make sure the label looks used to the compiler */ \
|
|
goto err_label; \
|
|
} while (0)
|
|
|
|
#define __put_kernel_nofault(dst, src, type, err_label) \
|
|
do { \
|
|
put_unaligned(*((type *)src), (type *)(dst)); \
|
|
if (0) /* make sure the label looks used to the compiler */ \
|
|
goto err_label; \
|
|
} while (0)
|
|
|
|
#endif
|