linux-kernel - Re: [PATCH] mm/page_alloc: Fix __alloc_size attribute for alloc_pages_exact

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Date:   Tue, 14 Dec 2021 09:06:19 -0800
From:   Kees Cook <keescook@...omium.org>
To:     Thibaut Sautereau <thibaut.sautereau@...p-os.org>
Cc:     Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, Daniel Micay <danielmicay@...il.com>,
        Levente Polyak <levente@...entepolyak.net>,
        Thibaut Sautereau <thibaut.sautereau@....gouv.fr>
Subject: Re: [PATCH] mm/page_alloc: Fix __alloc_size attribute for
 alloc_pages_exact_nid

On Tue, Dec 14, 2021 at 05:21:23PM +0100, Thibaut Sautereau wrote:
> From: Thibaut Sautereau <thibaut.sautereau@....gouv.fr>
> 
> The second parameter of alloc_pages_exact_nid is the one indicating the
> size of memory pointed by the returned pointer.
> 
> Fixes: abd58f38dfb4 ("mm/page_alloc: add __alloc_size attributes for better bounds checking")
> Cc: Daniel Micay <danielmicay@...il.com>
> Cc: Kees Cook <keescook@...omium.org>
> Cc: Levente Polyak <levente@...entepolyak.net>
> Signed-off-by: Thibaut Sautereau <thibaut.sautereau@....gouv.fr>

Thanks! Andrew, can you take this?

Acked-by: Kees Cook <keescook@...omium.org>

-Kees

> ---
>  include/linux/gfp.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/include/linux/gfp.h b/include/linux/gfp.h
> index b976c4177299..8fcc38467af6 100644
> --- a/include/linux/gfp.h
> +++ b/include/linux/gfp.h
> @@ -624,7 +624,7 @@ extern unsigned long get_zeroed_page(gfp_t gfp_mask);
>  
>  void *alloc_pages_exact(size_t size, gfp_t gfp_mask) __alloc_size(1);
>  void free_pages_exact(void *virt, size_t size);
> -__meminit void *alloc_pages_exact_nid(int nid, size_t size, gfp_t gfp_mask) __alloc_size(1);
> +__meminit void *alloc_pages_exact_nid(int nid, size_t size, gfp_t gfp_mask) __alloc_size(2);
>  
>  #define __get_free_page(gfp_mask) \
>  		__get_free_pages((gfp_mask), 0)
> -- 
> 2.34.1
> 

-- 
Kees Cook