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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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55
arch/x86/lib/usercopy.c
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@@ -4,12 +4,9 @@
* For licencing details see kernel-base/COPYING
*/
#include <linux/highmem.h>
#include <linux/uaccess.h>
#include <linux/export.h>
#include <asm/word-at-a-time.h>
#include <linux/sched.h>
/*
* We rely on the nested NMI work to allow atomic faults from the NMI path; the
* nested NMI paths are careful to preserve CR2.
@@ -34,53 +31,3 @@ copy_from_user_nmi(void *to, const void __user *from, unsigned long n)
return ret;
}
EXPORT_SYMBOL_GPL(copy_from_user_nmi);
/**
* copy_to_user: - Copy a block of data into user space.
* @to: Destination address, in user space.
* @from: Source address, in kernel space.
* @n: Number of bytes to copy.
*
* Context: User context only. This function may sleep if pagefaults are
* enabled.
*
* Copy data from kernel space to user space.
*
* Returns number of bytes that could not be copied.
* On success, this will be zero.
*/
unsigned long _copy_to_user(void __user *to, const void *from, unsigned n)
{
if (access_ok(VERIFY_WRITE, to, n))
n = __copy_to_user(to, from, n);
return n;
}
EXPORT_SYMBOL(_copy_to_user);
/**
* copy_from_user: - Copy a block of data from user space.
* @to: Destination address, in kernel space.
* @from: Source address, in user space.
* @n: Number of bytes to copy.
*
* Context: User context only. This function may sleep if pagefaults are
* enabled.
*
* Copy data from user space to kernel space.
*
* Returns number of bytes that could not be copied.
* On success, this will be zero.
*
* If some data could not be copied, this function will pad the copied
* data to the requested size using zero bytes.
*/
unsigned long _copy_from_user(void *to, const void __user *from, unsigned n)
{
unsigned long res = n;
if (access_ok(VERIFY_READ, from, n))
res = __copy_from_user_inatomic(to, from, n);
if (unlikely(res))
memset(to + n - res, 0, res);
return res;
}
EXPORT_SYMBOL(_copy_from_user);