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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