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    SubjectRe: [WTF?] sys_tas() on m32r
    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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    >Please read the FAQ at http://www.tux.org/lkml/
    >
    >
    >
    >
    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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