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Al Viro 写道:
>asmlinkage int sys_tas(int *addr)
>{
> int oldval;
> unsigned long flags;
>
> if (!access_ok(VERIFY_WRITE, addr, sizeof (int)))
> return -EFAULT;
> local_irq_save(flags);
> oldval = *addr;
> if (!oldval)
> *addr = 1;
> local_irq_restore(flags);
> return oldval;
>}
>in arch/m32r/kernel/sys_m32r.c. Trivial oops *AND* ability to trigger
>IO with interrupts disabled.
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The memory that parameter addr pointer is in user-space.
To access these memory, you should use function like copy_from_user().
-liyu
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