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generic ...copy_..._user primitives

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provide raw_copy_..._user() and select ARCH_HAS_RAW_COPY_USER to use those.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro
2017-03-20 21:56:06 -04:00
parent c1aad8dcc4
commit d597580d37
5 changed files with 229 additions and 0 deletions
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26
lib/usercopy.c Normal file
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@@ -0,0 +1,26 @@
#include <linux/uaccess.h>
/* out-of-line parts */
#ifndef INLINE_COPY_FROM_USER
unsigned long _copy_from_user(void *to, const void __user *from, unsigned long n)
{
unsigned long res = n;
if (likely(access_ok(VERIFY_READ, from, n)))
res = raw_copy_from_user(to, from, n);
if (unlikely(res))
memset(to + (n - res), 0, res);
return res;
}
EXPORT_SYMBOL(_copy_from_user);
#endif
#ifndef INLINE_COPY_TO_USER
unsigned long _copy_to_user(void *to, const void __user *from, unsigned long n)
{
if (likely(access_ok(VERIFY_WRITE, to, n)))
n = raw_copy_to_user(to, from, n);
return n;
}
EXPORT_SYMBOL(_copy_to_user);
#endif