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ff1383a7
2006 Mar 15
0
implicit grant unmap hacking [was RE: Grant tables from dom0 userspace?]
...I never see the printk() when the OS squashes the
mapping PTE. Instead, I get the backtrace I already mentioned, namely:
(XEN) [<ff13603e>] put_page_from_l1e+0xd0/0x1af
(XEN) [<ff13a891>] revalidate_l1+0x159/0x168
(XEN) [<ff13aac1>] ptwr_flush+0x221/0x32f
(XEN) [<ff13b6a7>] cleanup_writable_pagetable+0x5c/0x7d
(XEN) [<ff137c20>] do_mmuext_op+0x85/0x8c1
(XEN) [<ff149e0f>] hypercall+0x8f/0xaf
I was hoping that ptwr_do_page_fault() would happen first, but it
doesn''t happen at all. I conclude that the page table is writable by
the paravi...