Messages in this thread | | | Date | Mon, 11 Aug 2003 17:22:31 +0200 | From | Manfred Spraul <> | Subject | Re: 4GB+DEBUG_PAGEALLOC oopses with 2.6.0-test3-mm1 |
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Ingo Molnar wrote:
>(in theory it's possible that kernel-internal mounts pass in a pointer >where pointer + PAGE_SIZE is not a valid kernel address - if this happens >then we'd get a hard crash.) > > Exactly that happens. I'm running with CONFIG_PAGE_DEBUG, i.e. unallocated pages are marked as non-present in the linear mapping.
Regarding the i386 trap handler: show_registers tries to hexdump the current instructions. It did a __get_user, to avoid causing a fault when %eip is invalid. Now it contains:
> if ((user_mode(regs) && get_user(c, eip)) || > (!user_mode(regs) && __direct_get_user(c, eip))) { > printk(" Bad EIP value."); > break; > }
I.e. it's already fixed.
-- Manfred
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