linux-kernel - Re: [PATCH 3/7] struct page: add field for vm

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Date:   Mon, 26 Feb 2018 18:37:36 +0200
From:   Igor Stoppa <igor.stoppa@...wei.com>
To:     Matthew Wilcox <willy@...radead.org>
CC:     <david@...morbit.com>, <keescook@...omium.org>,
        <mhocko@...nel.org>, <labbott@...hat.com>,
        <linux-security-module@...r.kernel.org>, <linux-mm@...ck.org>,
        <linux-kernel@...r.kernel.org>,
        <kernel-hardening@...ts.openwall.com>
Subject: Re: [PATCH 3/7] struct page: add field for vm_struct



On 25/02/18 05:38, Matthew Wilcox wrote:
> On Fri, Feb 23, 2018 at 04:48:03PM +0200, Igor Stoppa wrote:
>> @@ -1769,6 +1771,9 @@ void *__vmalloc_node_range(unsigned long size, unsigned long align,
>>  
>>  	kmemleak_vmalloc(area, size, gfp_mask);
>>  
>> +	for (i = 0; i < area->nr_pages; i++)
>> +		area->pages[i]->area = area;
>> +
>>  	return addr;
>>  
>>  fail:
> 
> IMO, this is the wrong place to initialise the page->area.  It should be
> done in __vmalloc_area_node() like so:
> 
>                         area->nr_pages = i;
>                         goto fail;
>                 }
> +		page->area = area;
>                 area->pages[i] = page;
>                 if (gfpflags_allow_blocking(gfp_mask))
>                         cond_resched();
> 


ok

--
igor