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x86: 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
2017-03-25 19:33:21 -04:00
parent a41e0d7542
commit beba3a20bf
6 changed files with 24 additions and 395 deletions
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53
arch/x86/include/asm/uaccess.h
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@@ -682,59 +682,6 @@ extern struct movsl_mask {
# include <asm/uaccess_64.h>
#endif
unsigned long __must_check _copy_from_user(void *to, const void __user *from,
unsigned n);
unsigned long __must_check _copy_to_user(void __user *to, const void *from,
unsigned n);
extern void __compiletime_error("usercopy buffer size is too small")
__bad_copy_user(void);
static inline void copy_user_overflow(int size, unsigned long count)
{
WARN(1, "Buffer overflow detected (%d < %lu)!\n", size, count);
}
static __always_inline unsigned long __must_check
copy_from_user(void *to, const void __user *from, unsigned long n)
{
int sz = __compiletime_object_size(to);
might_fault();
kasan_check_write(to, n);
if (likely(sz < 0 || sz >= n)) {
check_object_size(to, n, false);
n = _copy_from_user(to, from, n);
} else if (!__builtin_constant_p(n))
copy_user_overflow(sz, n);
else
__bad_copy_user();
return n;
}
static __always_inline unsigned long __must_check
copy_to_user(void __user *to, const void *from, unsigned long n)
{
int sz = __compiletime_object_size(from);
kasan_check_read(from, n);
might_fault();
if (likely(sz < 0 || sz >= n)) {
check_object_size(from, n, true);
n = _copy_to_user(to, from, n);
} else if (!__builtin_constant_p(n))
copy_user_overflow(sz, n);
else
__bad_copy_user();
return n;
}
/*
* We rely on the nested NMI work to allow atomic faults from the NMI path; the
* nested NMI paths are careful to preserve CR2.