linux-kernel - Re: [PATCH] binfmt_elf.c: core file shrinking

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Date:	Fri, 14 Oct 2011 17:04:16 +0200
From:	Thanh-Lam NGUYEN <thanh-lam.nguyen@...atel-lucent.com>
To:	Hillf Danton <dhillf@...il.com>
CC:	Alexander Viro <viro@...iv.linux.org.uk>,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] binfmt_elf.c: core file shrinking

On 14/10/2011 16:45, Hillf Danton wrote:

> On Fri, Oct 14, 2011 at 4:52 PM, Thanh-Lam NGUYEN
> <thanh-lam.nguyen@...atel-lucent.com> wrote:
>> Sorry for upping the patch,
>> as it is my first contribution I would like to know if there is any
>> problem with it.
>>
>> Best regard
>> Thanh lam NGUYEN
>>
>> On 11/10/2011 17:36, Thanh-Lam NGUYEN wrote:
>>
>>> The vma_shrink function looks for the 1st allocated and the last
>>> allocated page. Only this part is dumped to the disk (the virual
>>> start address and the size are dupdated to reflect the new dumped
>>> information).
>>>
>>> Signed-off-by: Thanh Lam NGUYEN <thanh-lam.nguyen@...atel-lucent.com>
>>> Signed-off-by: Benjamin ZORES <Benjamin.Zores@...atel-lucent.com>
>>> ---
>>>  linux/fs/binfmt_elf.c |   54
>>> ++++++++++++++++++++++++++++++++++++++++++++++----
> 
> corrupted message?
> 
>>>  1 file changed, 55 insertions(+), 4 deletions(-)
>>>
>>> --- linux/fs/binfmt_elf.c
>>> +++ linux/fs/binfmt_elf.c
>>> @@ -1085,6 +1085,48 @@
>>>   * Jeremy Fitzhardinge <jeremy@...oz.au>
>>>   */
>>>
>>> +/*
>>> + * Search for 1st and last allocated page from vma_start to vma_end.
>>> + * Update vma_start and vma_end to reflect the result.
>>> + */
>>> +void vma_shrink(struct vm_area_struct *vma, unsigned long *vma_start,
>>> +             unsigned long *vma_end)
>>> +{
>>> +     int allocated;
>>> +     unsigned long start, addr, end;
>>> +
>>> +     allocated = 0;
>>> +     start = end = *vma_start;
>>> +     for (addr = *vma_start; _addr < *vma_end; addr += PAGE_SIZE) {
>                                         -----^
>                                         where is _addr from?
> 

My bad, it's addr and not _addr.

>>> +             struct page *page;
>>> +             if (get_user_pages(current, current->mm, addr, 1, 0, 1,
>>> +                                &page, NULL) <= 0) {
>>> +                     /* NO PAGE */
> --
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> 



-- 
=~=~=~=~=~=~=~=~=~=~=~=~==~=~=~=~=~=~=~=~=~=~=~=~=~=~=
Thanh lam NGUYEN
Prestataire externe ALTEN        | ALTEN Subcontractor
pour ALCATEL-LUCENT              | in ALCATEL-LUCENT

Tel: +333906 77095

Equipe/Team: SWINT
email: tlnguyen@...mail.alten.fr
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