On Wed, 2010-08-25 at 09:15 +1000, Anton Blanchard wrote:
> /* Are we prepared to handle this fault? */
> if ((entry = search_exception_tables(regs->nip)) != NULL) {
> @@ -413,5 +415,9 @@ void bad_page_fault(struct pt_regs *regs
> printk(KERN_ALERT "Faulting instruction address: 0x%08lx\n",
> regs->nip);
>
> + stackend = end_of_stack(current);
> + if (current != &init_task && *stackend != STACK_END_MAGIC)
> + printk(KERN_ALERT "Thread overran stack, or stack corrupted\n");
> +
> die("Kernel access of bad area", regs, sig);
> }
Is it worth making it a __get_user or similar just in case ? I suppose
if the stack is really busted we wouldn't even have reached that
code ...
Cheers,
Ben.
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