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Linux/arch/x86/lib/usercopy.c

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  1 /*
  2  * User address space access functions.
  3  *
  4  *  For licencing details see kernel-base/COPYING
  5  */
  6 
  7 #include <linux/highmem.h>
  8 #include <linux/module.h>
  9 
 10 #include <asm/word-at-a-time.h>
 11 #include <linux/sched.h>
 12 
 13 /*
 14  * We rely on the nested NMI work to allow atomic faults from the NMI path; the
 15  * nested NMI paths are careful to preserve CR2.
 16  */
 17 unsigned long
 18 copy_from_user_nmi(void *to, const void __user *from, unsigned long n)
 19 {
 20         unsigned long ret;
 21 
 22         if (__range_not_ok(from, n, TASK_SIZE))
 23                 return n;
 24 
 25         /*
 26          * Even though this function is typically called from NMI/IRQ context
 27          * disable pagefaults so that its behaviour is consistent even when
 28          * called form other contexts.
 29          */
 30         pagefault_disable();
 31         ret = __copy_from_user_inatomic(to, from, n);
 32         pagefault_enable();
 33 
 34         return ret;
 35 }
 36 EXPORT_SYMBOL_GPL(copy_from_user_nmi);
 37 

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