linux-kernel - Re: [PATCH] hibernation: on 32-bit x86, disabled in favor of KASLR

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Message-ID: <CADjb_WRD4b2sEfKMb4BOAAVUKyEVprju2+Hz_JPtm0EH4Oq6cQ@mail.gmail.com>
Date:   Fri, 24 Mar 2017 00:38:30 +0800
From:   Yu Chen <yu.chen.surf@...il.com>
To:     Evgenii Shatokhin <eugene.shatokhin@...dex.ru>
Cc:     Kees Cook <keescook@...omium.org>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Pavel Machek <pavel@....cz>, linux-doc@...r.kernel.org,
        Linux PM list <linux-pm@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "H. Peter Anvin" <hpa@...or.com>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH] hibernation: on 32-bit x86, disabled in favor of KASLR

Hi,

On Thu, Mar 23, 2017 at 9:23 PM, Evgenii Shatokhin
<eugene.shatokhin@...dex.ru> wrote:
> On 23.03.2017 03:27, Kees Cook wrote:
>>
>> This is a modified revert of commit 65fe935dd238 ("x86/KASLR, x86/power:
>> Remove x86 hibernation restrictions"), since it appears that 32-bit
>> hibernation still can't support KASLR. 64-bit is fine. Since people have
>> been running with KASLR by default on 32-bit since v4.8, this disables
>> hibernation (with a warning). Booting with "nokaslr" will disable KASLR
>> and enable hibernation.
>>
>> Reported-by: Evgenii Shatokhin <eugene.shatokhin@...dex.ru>
>> Signed-off-by: Kees Cook <keescook@...omium.org>
>> Cc: stable@...r.kernel.org # v4.8+
>
>
> The patch does not work as intended on my system, unfortunately.
>
> I tried the mainline kernel v4.11-rc3 and added this patch. With "nokaslr"
> in the kernel command line, the system fails to hibernate. It complains this
> way in the log:
Could you please send me your kernel config? I've built a 4.11-rc3
image and runs
it on my 32bit laptop and hibernate works on CONFIG_RANDOMIZE_BASE=y

Yu