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SubjectRe: [PATCH 3/3 V13] RO/NX protection for loadable kernel
Kees Cook a écrit :
> Hi,
>
> I was just shown this[1] on Xen from an Ubuntu bug report[2].
>
> [ 1.230382] NX-protecting the kernel data: 3884k
> [ 1.231002] BUG: unable to handle kernel paging request at c1782ae0
> ...
> [ 1.231145] Call Trace:
> [ 1.231152] [<c0138481>] ? __change_page_attr+0x2c1/0x370
> [ 1.231161] [<c02163a1>] ? __purge_vmap_area_lazy+0xc1/0x180
> [ 1.231169] [<c013857c>] ? __change_page_attr_set_clr+0x4c/0xb0
> [ 1.231176] [<c0138838>] ? change_page_attr_set_clr+0x128/0x300
> [ 1.231183] [<c010798e>] ? __raw_callee_save_xen_restore_fl+0x6/0x8
> [ 1.231192] [<c0159ca1>] ? vprintk+0x171/0x3f0
> [ 1.231198] [<c0138bdf>] ? set_memory_nx+0x5f/0x70
>
>
> Does Xen have different size page table allocations or something weird?
>
Note that this one isn't related to this one but to "Add NX protection for kernel data".

But have no idea how xen page table work.

Matthieu
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