mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-15 19:46:45 +07:00
01eb42afb4
arch/s390/lib/uaccess.c is built without kasan instrumentation. Kasan checks are performed explicitly in copy_from_user/copy_to_user functions. But since those functions could be inlined, calls from files like uaccess.c with instrumentation disabled won't generate kasan reports. This is currently the case with strncpy_from_user function which was revealed by newly added kasan test. Avoid inlining of copy_from_user/copy_to_user when the kernel is built with kasan support to make sure kasan checks are fully functional. Signed-off-by: Vasily Gorbik <gor@linux.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
282 lines
6.5 KiB
C
282 lines
6.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
/*
|
|
* S390 version
|
|
* Copyright IBM Corp. 1999, 2000
|
|
* Author(s): Hartmut Penner (hp@de.ibm.com),
|
|
* Martin Schwidefsky (schwidefsky@de.ibm.com)
|
|
*
|
|
* Derived from "include/asm-i386/uaccess.h"
|
|
*/
|
|
#ifndef __S390_UACCESS_H
|
|
#define __S390_UACCESS_H
|
|
|
|
/*
|
|
* User space memory access functions
|
|
*/
|
|
#include <asm/processor.h>
|
|
#include <asm/ctl_reg.h>
|
|
#include <asm/extable.h>
|
|
#include <asm/facility.h>
|
|
|
|
/*
|
|
* The fs value determines whether argument validity checking should be
|
|
* performed or not. If get_fs() == USER_DS, checking is performed, with
|
|
* get_fs() == KERNEL_DS, checking is bypassed.
|
|
*
|
|
* For historical reasons, these macros are grossly misnamed.
|
|
*/
|
|
|
|
#define KERNEL_DS (0)
|
|
#define KERNEL_DS_SACF (1)
|
|
#define USER_DS (2)
|
|
#define USER_DS_SACF (3)
|
|
|
|
#define get_fs() (current->thread.mm_segment)
|
|
#define segment_eq(a,b) (((a) & 2) == ((b) & 2))
|
|
|
|
void set_fs(mm_segment_t fs);
|
|
|
|
static inline int __range_ok(unsigned long addr, unsigned long size)
|
|
{
|
|
return 1;
|
|
}
|
|
|
|
#define __access_ok(addr, size) \
|
|
({ \
|
|
__chk_user_ptr(addr); \
|
|
__range_ok((unsigned long)(addr), (size)); \
|
|
})
|
|
|
|
#define access_ok(addr, size) __access_ok(addr, size)
|
|
|
|
unsigned long __must_check
|
|
raw_copy_from_user(void *to, const void __user *from, unsigned long n);
|
|
|
|
unsigned long __must_check
|
|
raw_copy_to_user(void __user *to, const void *from, unsigned long n);
|
|
|
|
#ifndef CONFIG_KASAN
|
|
#define INLINE_COPY_FROM_USER
|
|
#define INLINE_COPY_TO_USER
|
|
#endif
|
|
|
|
#ifdef CONFIG_HAVE_MARCH_Z10_FEATURES
|
|
|
|
#define __put_get_user_asm(to, from, size, spec) \
|
|
({ \
|
|
register unsigned long __reg0 asm("0") = spec; \
|
|
int __rc; \
|
|
\
|
|
asm volatile( \
|
|
"0: mvcos %1,%3,%2\n" \
|
|
"1: xr %0,%0\n" \
|
|
"2:\n" \
|
|
".pushsection .fixup, \"ax\"\n" \
|
|
"3: lhi %0,%5\n" \
|
|
" jg 2b\n" \
|
|
".popsection\n" \
|
|
EX_TABLE(0b,3b) EX_TABLE(1b,3b) \
|
|
: "=d" (__rc), "+Q" (*(to)) \
|
|
: "d" (size), "Q" (*(from)), \
|
|
"d" (__reg0), "K" (-EFAULT) \
|
|
: "cc"); \
|
|
__rc; \
|
|
})
|
|
|
|
static inline int __put_user_fn(void *x, void __user *ptr, unsigned long size)
|
|
{
|
|
unsigned long spec = 0x010000UL;
|
|
int rc;
|
|
|
|
switch (size) {
|
|
case 1:
|
|
rc = __put_get_user_asm((unsigned char __user *)ptr,
|
|
(unsigned char *)x,
|
|
size, spec);
|
|
break;
|
|
case 2:
|
|
rc = __put_get_user_asm((unsigned short __user *)ptr,
|
|
(unsigned short *)x,
|
|
size, spec);
|
|
break;
|
|
case 4:
|
|
rc = __put_get_user_asm((unsigned int __user *)ptr,
|
|
(unsigned int *)x,
|
|
size, spec);
|
|
break;
|
|
case 8:
|
|
rc = __put_get_user_asm((unsigned long __user *)ptr,
|
|
(unsigned long *)x,
|
|
size, spec);
|
|
break;
|
|
}
|
|
return rc;
|
|
}
|
|
|
|
static inline int __get_user_fn(void *x, const void __user *ptr, unsigned long size)
|
|
{
|
|
unsigned long spec = 0x01UL;
|
|
int rc;
|
|
|
|
switch (size) {
|
|
case 1:
|
|
rc = __put_get_user_asm((unsigned char *)x,
|
|
(unsigned char __user *)ptr,
|
|
size, spec);
|
|
break;
|
|
case 2:
|
|
rc = __put_get_user_asm((unsigned short *)x,
|
|
(unsigned short __user *)ptr,
|
|
size, spec);
|
|
break;
|
|
case 4:
|
|
rc = __put_get_user_asm((unsigned int *)x,
|
|
(unsigned int __user *)ptr,
|
|
size, spec);
|
|
break;
|
|
case 8:
|
|
rc = __put_get_user_asm((unsigned long *)x,
|
|
(unsigned long __user *)ptr,
|
|
size, spec);
|
|
break;
|
|
}
|
|
return rc;
|
|
}
|
|
|
|
#else /* CONFIG_HAVE_MARCH_Z10_FEATURES */
|
|
|
|
static inline int __put_user_fn(void *x, void __user *ptr, unsigned long size)
|
|
{
|
|
size = raw_copy_to_user(ptr, x, size);
|
|
return size ? -EFAULT : 0;
|
|
}
|
|
|
|
static inline int __get_user_fn(void *x, const void __user *ptr, unsigned long size)
|
|
{
|
|
size = raw_copy_from_user(x, ptr, size);
|
|
return size ? -EFAULT : 0;
|
|
}
|
|
|
|
#endif /* CONFIG_HAVE_MARCH_Z10_FEATURES */
|
|
|
|
/*
|
|
* These are the main single-value transfer routines. They automatically
|
|
* use the right size if we just have the right pointer type.
|
|
*/
|
|
#define __put_user(x, ptr) \
|
|
({ \
|
|
__typeof__(*(ptr)) __x = (x); \
|
|
int __pu_err = -EFAULT; \
|
|
__chk_user_ptr(ptr); \
|
|
switch (sizeof (*(ptr))) { \
|
|
case 1: \
|
|
case 2: \
|
|
case 4: \
|
|
case 8: \
|
|
__pu_err = __put_user_fn(&__x, ptr, \
|
|
sizeof(*(ptr))); \
|
|
break; \
|
|
default: \
|
|
__put_user_bad(); \
|
|
break; \
|
|
} \
|
|
__builtin_expect(__pu_err, 0); \
|
|
})
|
|
|
|
#define put_user(x, ptr) \
|
|
({ \
|
|
might_fault(); \
|
|
__put_user(x, ptr); \
|
|
})
|
|
|
|
|
|
int __put_user_bad(void) __attribute__((noreturn));
|
|
|
|
#define __get_user(x, ptr) \
|
|
({ \
|
|
int __gu_err = -EFAULT; \
|
|
__chk_user_ptr(ptr); \
|
|
switch (sizeof(*(ptr))) { \
|
|
case 1: { \
|
|
unsigned char __x = 0; \
|
|
__gu_err = __get_user_fn(&__x, ptr, \
|
|
sizeof(*(ptr))); \
|
|
(x) = *(__force __typeof__(*(ptr)) *) &__x; \
|
|
break; \
|
|
}; \
|
|
case 2: { \
|
|
unsigned short __x = 0; \
|
|
__gu_err = __get_user_fn(&__x, ptr, \
|
|
sizeof(*(ptr))); \
|
|
(x) = *(__force __typeof__(*(ptr)) *) &__x; \
|
|
break; \
|
|
}; \
|
|
case 4: { \
|
|
unsigned int __x = 0; \
|
|
__gu_err = __get_user_fn(&__x, ptr, \
|
|
sizeof(*(ptr))); \
|
|
(x) = *(__force __typeof__(*(ptr)) *) &__x; \
|
|
break; \
|
|
}; \
|
|
case 8: { \
|
|
unsigned long long __x = 0; \
|
|
__gu_err = __get_user_fn(&__x, ptr, \
|
|
sizeof(*(ptr))); \
|
|
(x) = *(__force __typeof__(*(ptr)) *) &__x; \
|
|
break; \
|
|
}; \
|
|
default: \
|
|
__get_user_bad(); \
|
|
break; \
|
|
} \
|
|
__builtin_expect(__gu_err, 0); \
|
|
})
|
|
|
|
#define get_user(x, ptr) \
|
|
({ \
|
|
might_fault(); \
|
|
__get_user(x, ptr); \
|
|
})
|
|
|
|
int __get_user_bad(void) __attribute__((noreturn));
|
|
|
|
unsigned long __must_check
|
|
raw_copy_in_user(void __user *to, const void __user *from, unsigned long n);
|
|
|
|
/*
|
|
* Copy a null terminated string from userspace.
|
|
*/
|
|
|
|
long __strncpy_from_user(char *dst, const char __user *src, long count);
|
|
|
|
static inline long __must_check
|
|
strncpy_from_user(char *dst, const char __user *src, long count)
|
|
{
|
|
might_fault();
|
|
return __strncpy_from_user(dst, src, count);
|
|
}
|
|
|
|
unsigned long __must_check __strnlen_user(const char __user *src, unsigned long count);
|
|
|
|
static inline unsigned long strnlen_user(const char __user *src, unsigned long n)
|
|
{
|
|
might_fault();
|
|
return __strnlen_user(src, n);
|
|
}
|
|
|
|
/*
|
|
* Zero Userspace
|
|
*/
|
|
unsigned long __must_check __clear_user(void __user *to, unsigned long size);
|
|
|
|
static inline unsigned long __must_check clear_user(void __user *to, unsigned long n)
|
|
{
|
|
might_fault();
|
|
return __clear_user(to, n);
|
|
}
|
|
|
|
int copy_to_user_real(void __user *dest, void *src, unsigned long count);
|
|
void s390_kernel_write(void *dst, const void *src, size_t size);
|
|
|
|
#endif /* __S390_UACCESS_H */
|