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blackfin: no access_ok() for __copy_{to,from}_user()

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callers have checked that already

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2016-09-10 18:53:30 -04:00
parent 4855bd255f
commit b065444286
1 changed files with 20 additions and 12 deletions
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32
arch/blackfin/include/asm/uaccess.h
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@ -163,18 +163,29 @@ static inline int bad_user_access_length(void)
: "a" (__ptr(ptr))); \
})
#define __copy_from_user(to, from, n) copy_from_user(to, from, n)
#define __copy_to_user(to, from, n) copy_to_user(to, from, n)
#define __copy_to_user_inatomic __copy_to_user
#define __copy_from_user_inatomic __copy_from_user
static inline unsigned long __must_check
__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 __must_check
__copy_to_user(void __user *to, const void *from, unsigned long n)
{
memcpy((void __force *)to, from, n);
SSYNC();
return 0;
}
static inline unsigned long __must_check
copy_from_user(void *to, const void __user *from, unsigned long n)
{
if (likely(access_ok(VERIFY_READ, from, n))) {
memcpy(to, (const void __force *)from, n);
return 0;
}
if (likely(access_ok(VERIFY_READ, from, n)))
return __copy_from_user(to, from, n);
memset(to, 0, n);
return n;
}
@ -182,12 +193,9 @@ copy_from_user(void *to, const void __user *from, unsigned long n)
static inline unsigned long __must_check
copy_to_user(void __user *to, const void *from, unsigned long n)
{
if (access_ok(VERIFY_WRITE, to, n))
memcpy((void __force *)to, from, n);
else
return n;
SSYNC();
return 0;
if (likely(access_ok(VERIFY_WRITE, to, n)))
return __copy_to_user(to, from, n);
return n;
}
/*