On Mon, Apr 27, 2015 at 11:25 AM, PaX Team wrote:
>
> the PaX SANITIZE feature does exactly this in mm/page_alloc.c:prep_new_page:
>
> #ifndef CONFIG_PAX_MEMORY_SANITIZE
> if (gfp_flags & __GFP_ZERO)
> prep_zero_page(page, order, gfp_flags);
> #endif
>
Thanks, I'll do that
On 27 Apr 2015 at 10:11, Anisse Astier wrote:
> >> +#ifdef CONFIG_SANITIZE_FREED_PAGES
> >> + zero_pages(page, order);
> >> +#endif
> >
> > And not removing the clear on __GFP_ZERO by remembering that?
> >
> > That means all clears would be done twice.
> >
> > That patch is far too simple. Cle
Hi Andi,
Thinks for taking the time to review this.
On Sun, Apr 26, 2015 at 10:12 PM, Andi Kleen wrote:
> Anisse Astier writes:
>> + If unsure, say N.
>> diff --git a/mm/page_alloc.c b/mm/page_alloc.c
>> index 05fcec9..c71440a 100644
>> --- a/mm/page_alloc.c
>> +++ b/mm/page_alloc.c
>> @@
Anisse Astier writes:
> + If unsure, say N.
> diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> index 05fcec9..c71440a 100644
> --- a/mm/page_alloc.c
> +++ b/mm/page_alloc.c
> @@ -803,6 +803,11 @@ static bool free_pages_prepare(struct page *page,
> unsigned int order)
> debug_c
On Fri, Apr 24, 2015 at 11:38 PM, David Rientjes wrote:
> On Fri, 24 Apr 2015, Anisse Astier wrote:
>
>> diff --git a/mm/Kconfig b/mm/Kconfig
>> index 390214d..cb2df5f 100644
>> --- a/mm/Kconfig
>> +++ b/mm/Kconfig
>> @@ -635,3 +635,15 @@ config MAX_STACK_SIZE_MB
>> changed to a smaller va
On Fri, 24 Apr 2015, Anisse Astier wrote:
> diff --git a/mm/Kconfig b/mm/Kconfig
> index 390214d..cb2df5f 100644
> --- a/mm/Kconfig
> +++ b/mm/Kconfig
> @@ -635,3 +635,15 @@ config MAX_STACK_SIZE_MB
> changed to a smaller value in which case that is used.
>
> A sane initial value
This new config option will sanitize all freed pages. This is a pretty
low-level change useful to track some cases of use-after-free, help
kernel same-page merging in VM environments, and counter a few info
leaks.
Signed-off-by: Anisse Astier
---
mm/Kconfig | 12
mm/page_alloc.
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