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@xxxxxxxxx> 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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