Revision 1a60864fc1c3b268a921549bcfc707c98083260b authored by Linus Torvalds on 15 January 2014, 08:07:36 UTC, committed by Linus Torvalds on 15 January 2014, 08:07:36 UTC
Pull late md fixes from Neil Brown: "Half a dozen md bug fixes. All of these fix real bugs the people have hit, and are tagged for -stable. Sorry they are late .... Christmas holidays and all that. Hopefully they can still squeak into 3.13" * tag 'md/3.13-fixes' of git://neil.brown.name/md: md: fix problem when adding device to read-only array with bitmap. md/raid10: fix bug when raid10 recovery fails to recover a block. md/raid5: fix a recently broken BUG_ON(). md/raid1: fix request counting bug in new 'barrier' code. md/raid10: fix two bugs in handling of known-bad-blocks. md/raid5: Fix possible confusion when multiple write errors occur.
maccess.c
/*
* Access kernel memory without faulting.
*/
#include <linux/export.h>
#include <linux/mm.h>
#include <linux/uaccess.h>
/**
* probe_kernel_read(): safely attempt to read from a location
* @dst: pointer to the buffer that shall take the data
* @src: address to read from
* @size: size of the data chunk
*
* Safely read from address @src to the buffer at @dst. If a kernel fault
* happens, handle that and return -EFAULT.
*/
long __weak probe_kernel_read(void *dst, const void *src, size_t size)
__attribute__((alias("__probe_kernel_read")));
long __probe_kernel_read(void *dst, const void *src, size_t size)
{
long ret;
mm_segment_t old_fs = get_fs();
set_fs(KERNEL_DS);
pagefault_disable();
ret = __copy_from_user_inatomic(dst,
(__force const void __user *)src, size);
pagefault_enable();
set_fs(old_fs);
return ret ? -EFAULT : 0;
}
EXPORT_SYMBOL_GPL(probe_kernel_read);
/**
* probe_kernel_write(): safely attempt to write to a location
* @dst: address to write to
* @src: pointer to the data that shall be written
* @size: size of the data chunk
*
* Safely write to address @dst from the buffer at @src. If a kernel fault
* happens, handle that and return -EFAULT.
*/
long __weak probe_kernel_write(void *dst, const void *src, size_t size)
__attribute__((alias("__probe_kernel_write")));
long __probe_kernel_write(void *dst, const void *src, size_t size)
{
long ret;
mm_segment_t old_fs = get_fs();
set_fs(KERNEL_DS);
pagefault_disable();
ret = __copy_to_user_inatomic((__force void __user *)dst, src, size);
pagefault_enable();
set_fs(old_fs);
return ret ? -EFAULT : 0;
}
EXPORT_SYMBOL_GPL(probe_kernel_write);
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