linux-kernel - Re: [PATCH] mm/vmalloc: Fix regression caused by needless vmalloc_sync

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>] [day] [month] [year] [list]

Message-ID: <88a7e8d5-84bc-46b1-573e-9da18218ef57@linux.alibaba.com>
Date:   Fri, 15 Nov 2019 09:06:46 +0800
From:   Shile Zhang <shile.zhang@...ux.alibaba.com>
To:     Joerg Roedel <jroedel@...e.de>
Cc:     Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm/vmalloc: Fix regression caused by needless
 vmalloc_sync_all()



On 2019/11/15 01:12, Joerg Roedel wrote:
> On Wed, Nov 13, 2019 at 05:55:30PM +0800, Shile Zhang wrote:
>> +#if defined(CONFIG_X86_32) && defined(CONFIG_X86_PAE)
>>   	/*
>>   	 * First make sure the mappings are removed from all page-tables
>>   	 * before they are freed.
>> +	 *
>> +	 * This is only needed on x86-32 with !SHARED_KERNEL_PMD, which is
>> +	 * the case on a PAE kernel with PTI enabled.
>>   	 */
>> -	vmalloc_sync_all();
>> +	if (!SHARED_KERNEL_PMD && boot_cpu_has(X86_FEATURE_PTI))
>> +		vmalloc_sync_all();
>> +#endif
> I already submitted another fix for this quite some time ago:
>
> 	https://lore.kernel.org/lkml/20191009124418.8286-1-joro@8bytes.org/
>
> Regards,
>
> 	Joerg
Oh, sorry for I missed that, good job and thanks for your work!