Re: [PATCH v2 4/4] mm: Add debug code for SANITIZE_FREED_PAGES

[Anisse Astier]

On Mon, May 4, 2015 at 11:50 PM, PaX Team <pageexec@xxxxxxxxxxx> wrote:
> On 4 May 2015 at 23:16, Anisse Astier wrote:
>
>> diff --git a/mm/page_alloc.c b/mm/page_alloc.c
>> index c29e3a0..ba8aa25 100644
>> --- a/mm/page_alloc.c
>> +++ b/mm/page_alloc.c
>> @@ -975,6 +975,31 @@ static int prep_new_page(struct page *page, unsigned int order, gfp_t gfp_flags,
>>               for (i = 0; i < (1 << order); i++)
>>                       clear_highpage(page + i);
>>  #endif
>> +#ifdef CONFIG_SANITIZE_FREED_PAGES_DEBUG
>> +     for (i = 0; i < (1 << order); i++) {
>> +             struct page *p = page + i;
>> +             int j;
>> +             bool err = false;
>> +             void *kaddr = kmap_atomic(p);
>> +
>> +             for (j = 0; j < PAGE_SIZE; j++) {
>
> did you mean to use memchr_inv(kaddr, 0, PAGE_SIZE) instead? ;)

Will be fixed in v3, although as I said I'm not sure if this debug
code should go in or not.

Thanks for you time.

Anisse
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