linux-kernel - Re: [PATCH 1/3] uprobes: fix the usage of install_special

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Message-ID: <CALCETrXZK+w61jWOtOa6ARZFwA-+JUXXu1iZvaEuTiTK+nDb6A@mail.gmail.com>
Date:	Thu, 9 Jul 2015 15:12:47 -0700
From:	Andy Lutomirski <luto@...capital.net>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Ingo Molnar <mingo@...nel.org>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/3] uprobes: fix the usage of install_special_mapping()

On Thu, Jul 9, 2015 at 3:02 PM, Oleg Nesterov <oleg@...hat.com> wrote:
> On 07/09, Andy Lutomirski wrote:
>>
>> On Thu, Jul 9, 2015 at 2:44 PM, Oleg Nesterov <oleg@...hat.com> wrote:
>> > install_special_mapping(pages) expects that "pages" is the zero-
>> > terminated array while xol_add_vma() passes &area->page, this means
>> > that special_mapping_fault() can wrongly use the next member in
>> > xol_area (vaddr) as "struct page *".
>> >
>> > Fortunately, this area is not expandable so pgoff != 0 isn't possible
>> > (modulo bugs in special_mapping_vmops), but still this does not look
>> > good.
>> >
>>
>> I fell for that awhile back, too, causing a bizarre HPET bug.
>
> I guess you mean no_pages[] = {NULL} in map_vdso() ?

Yes.

--Andy
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