Page Fault

[Enzo Desiage]

Thanks for the answer!

I set the clear interrupt flag from this article:
http://vulnfactory.org/blog/2011/08/12/wp-safe-or-not/
As apparently if not done it could lead to a scheduling problem on SMP
systems?

Thanks,
Enzo

On Thu, Apr 23, 2020 at 2:05 AM 양원혁 <kjhg4321 at naver.com> wrote:

> According to the log, the page frame of sys_call_table is not currently
> present.
>
> So it should be handled by page fault handler.
> But. disable_write_protection blocks the interrupt via the cli
> instruction.
> So the page fault handler cannot be performed.
>
>
>
> > [ 4024.772066] Module loading
> > [ 4024.790716] + sys_call_table address = 00000000055df43d
> > [ 4024.790718] Execve syscall # 59
> > [ 4024.791116] BUG: unable to handle page fault for address:
> 000000008004020b
> > [ 4024.792614] #PF: supervisor write access in kernel mode
> > [ 4024.793944] #PF: error_code(0x0002) - not-present page
>
>
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