linux-kernel - Re: [PATCH v2 2/4] mm/hwpoison: fix miss catch transparent huge page

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Mon, 02 Sep 2013 20:20:52 -0400
From:	Naoya Horiguchi <n-horiguchi@...jp.nec.com>
To:	Wanpeng Li <liwanp@...ux.vnet.ibm.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Andi Kleen <andi@...stfloor.org>,
	Fengguang Wu <fengguang.wu@...el.com>,
	Tony Luck <tony.luck@...el.com>, gong.chen@...ux.intel.com,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/4] mm/hwpoison: fix miss catch transparent huge page

On Tue, Sep 03, 2013 at 07:36:44AM +0800, Wanpeng Li wrote:
> Changelog:
>  *v1 -> v2: reverse PageTransHuge(page) && !PageHuge(page) check 
> 
> PageTransHuge() can't guarantee the page is transparent huge page since it 
> return true for both transparent huge and hugetlbfs pages. This patch fix 
> it by check the page is also !hugetlbfs page.
> 
> Before patch:
> 
> [  121.571128] Injecting memory failure at pfn 23a200
> [  121.571141] MCE 0x23a200: huge page recovery: Delayed
> [  140.355100] MCE: Memory failure is now running on 0x23a200
> 
> After patch:
> 
> [   94.290793] Injecting memory failure at pfn 23a000
> [   94.290800] MCE 0x23a000: huge page recovery: Delayed
> [  105.722303] MCE: Software-unpoisoned page 0x23a000
> 
> Signed-off-by: Wanpeng Li <liwanp@...ux.vnet.ibm.com>

Thanks!

Reviewed-by: Naoya Horiguchi <n-horiguchi@...jp.nec.com>

> ---
>  mm/memory-failure.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/mm/memory-failure.c b/mm/memory-failure.c
> index e28ee77..b114570 100644
> --- a/mm/memory-failure.c
> +++ b/mm/memory-failure.c
> @@ -1349,7 +1349,7 @@ int unpoison_memory(unsigned long pfn)
>  	 * worked by memory_failure() and the page lock is not held yet.
>  	 * In such case, we yield to memory_failure() and make unpoison fail.
>  	 */
> -	if (PageTransHuge(page)) {
> +	if (!PageHuge(page) && PageTransHuge(page)) {
>  		pr_info("MCE: Memory failure is now running on %#lx\n", pfn);
>  			return 0;
>  	}
> -- 
> 1.8.1.2
> 
> --
> To unsubscribe, send a message with 'unsubscribe linux-mm' in
> the body to majordomo@...ck.org.  For more info on Linux MM,
> see: http://www.linux-mm.org/ .
> Don't email: <a href=mailto:"dont@...ck.org"> email@...ck.org </a>
>
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/