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arm: 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 08:23:33 -04:00
parent 0f9b38cd79
commit 4de5b63e76
2 changed files with 17 additions and 48 deletions
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1
arch/arm/Kconfig
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@ -96,6 +96,7 @@ config ARM
select PERF_USE_VMALLOC
select RTC_LIB
select SYS_SUPPORTS_APM_EMULATION
select ARCH_HAS_RAW_COPY_USER
# Above selects are sorted alphabetically; please add new ones
# according to that. Thanks.
help

64
arch/arm/include/asm/uaccess.h
View File

@ -455,7 +455,7 @@ extern unsigned long __must_check
arm_copy_from_user(void *to, const void __user *from, unsigned long n);
static inline unsigned long __must_check
__arch_copy_from_user(void *to, const void __user *from, unsigned long n)
raw_copy_from_user(void *to, const void __user *from, unsigned long n)
{
unsigned int __ua_flags;
@ -471,7 +471,7 @@ extern unsigned long __must_check
__copy_to_user_std(void __user *to, const void *from, unsigned long n);
static inline unsigned long __must_check
__arch_copy_to_user(void __user *to, const void *from, unsigned long n)
raw_copy_to_user(void __user *to, const void *from, unsigned long n)
{
#ifndef CONFIG_UACCESS_WITH_MEMCPY
unsigned int __ua_flags;
@ -499,54 +499,22 @@ __clear_user(void __user *addr, unsigned long n)
}
#else
#define __arch_copy_from_user(to, from, n) \
(memcpy(to, (void __force *)from, n), 0)
#define __arch_copy_to_user(to, from, n) \
(memcpy((void __force *)to, from, n), 0)
static inline unsigned long
raw_copy_from_user(void *to, const void __user *from, unsigned long n)
{
memcpy(to, (const void __force *)from, n);
return 0;
}
static inline unsigned long
raw_copy_to_user(void __user *to, const void *from, unsigned long n)
{
memcpy((void __force *)to, from, n);
return 0;
}
#define __clear_user(addr, n) (memset((void __force *)addr, 0, n), 0)
#endif
static inline unsigned long __must_check
__copy_from_user(void *to, const void __user *from, unsigned long n)
{
check_object_size(to, n, false);
return __arch_copy_from_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;
check_object_size(to, n, false);
if (likely(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)
{
check_object_size(from, n, true);
return __arch_copy_to_user(to, from, n);
}
static inline unsigned long __must_check
copy_to_user(void __user *to, const void *from, unsigned long n)
{
check_object_size(from, n, true);
if (access_ok(VERIFY_WRITE, to, n))
n = __arch_copy_to_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)
{