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arm64: switch to RAW_COPY_USER

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Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2017-03-21 08:40:57 -04:00
parent 46583939b9
commit 92430dab36
4 changed files with 9 additions and 53 deletions
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1
arch/arm64/Kconfig
View File

@ -115,6 +115,7 @@ config ARM64
select SPARSE_IRQ
select SYSCTL_EXCEPTION_TRACE
select THREAD_INFO_IN_TASK
select ARCH_HAS_RAW_COPY_USER
help
ARM 64-bit (AArch64) Linux support.

55
arch/arm64/include/asm/uaccess.h
View File

@ -331,58 +331,13 @@ do { \
})
extern unsigned long __must_check __arch_copy_from_user(void *to, const void __user *from, unsigned long n);
#define raw_copy_from_user __arch_copy_from_user
extern unsigned long __must_check __arch_copy_to_user(void __user *to, const void *from, unsigned long n);
extern unsigned long __must_check __copy_in_user(void __user *to, const void __user *from, unsigned long n);
#define raw_copy_to_user __arch_copy_to_user
extern unsigned long __must_check raw_copy_in_user(void __user *to, const void __user *from, unsigned long n);
extern unsigned long __must_check __clear_user(void __user *addr, unsigned long n);
static inline unsigned long __must_check __copy_from_user(void *to, const void __user *from, unsigned long n)
{
kasan_check_write(to, n);
check_object_size(to, n, false);
return __arch_copy_from_user(to, from, n);
}
static inline unsigned long __must_check __copy_to_user(void __user *to, const void *from, unsigned long n)
{
kasan_check_read(from, n);
check_object_size(from, n, true);
return __arch_copy_to_user(to, from, n);
}
static inline unsigned long __must_check copy_from_user(void *to, const void __user *from, unsigned long n)
{
unsigned long res = n;
kasan_check_write(to, n);
check_object_size(to, n, false);
if (access_ok(VERIFY_READ, from, n)) {
res = __arch_copy_from_user(to, from, n);
}
if (unlikely(res))
memset(to + (n - res), 0, res);
return res;
}
static inline unsigned long __must_check copy_to_user(void __user *to, const void *from, unsigned long n)
{
kasan_check_read(from, n);
check_object_size(from, n, true);
if (access_ok(VERIFY_WRITE, to, n)) {
n = __arch_copy_to_user(to, from, n);
}
return n;
}
static inline unsigned long __must_check copy_in_user(void __user *to, const void __user *from, unsigned long n)
{
if (access_ok(VERIFY_READ, from, n) && access_ok(VERIFY_WRITE, to, n))
n = __copy_in_user(to, from, n);
return n;
}
#define __copy_to_user_inatomic __copy_to_user
#define __copy_from_user_inatomic __copy_from_user
#define INLINE_COPY_TO_USER
#define INLINE_COPY_FROM_USER
static inline unsigned long __must_check clear_user(void __user *to, unsigned long n)
{

2
arch/arm64/kernel/arm64ksyms.c
View File

@ -38,7 +38,7 @@ EXPORT_SYMBOL(clear_page);
EXPORT_SYMBOL(__arch_copy_from_user);
EXPORT_SYMBOL(__arch_copy_to_user);
EXPORT_SYMBOL(__clear_user);
EXPORT_SYMBOL(__copy_in_user);
EXPORT_SYMBOL(raw_copy_in_user);
/* physical memory */
EXPORT_SYMBOL(memstart_addr);

4
arch/arm64/lib/copy_in_user.S
View File

@ -64,14 +64,14 @@
.endm
end .req x5
ENTRY(__copy_in_user)
ENTRY(raw_copy_in_user)
uaccess_enable_not_uao x3, x4
add end, x0, x2
#include "copy_template.S"
uaccess_disable_not_uao x3
mov x0, #0
ret
ENDPROC(__copy_in_user)
ENDPROC(raw_copy_in_user)
.section .fixup,"ax"
.align 2