From: Chao Fan <fanc.fnst@cn.fujitsu.com>
To: Borislav Petkov <bp@alien8.de>
Cc: <linux-kernel@vger.kernel.org>, <x86@kernel.org>,
<linux-efi@vger.kernel.org>, <linux-acpi@vger.kernel.org>,
<tglx@linutronix.de>, <mingo@redhat.com>, <hpa@zytor.com>,
<keescook@chromium.org>, <bhe@redhat.com>, <rjw@rjwysocki.net>,
<lenb@kernel.org>, <ard.biesheuvel@linaro.org>,
<indou.takao@jp.fujitsu.com>, <caoj.fnst@cn.fujitsu.com>
Subject: Re: [PATCH v8 0/3] x86/boot/KASLR: Parse ACPI table and limit kaslr in immovable memory
Date: Thu, 11 Oct 2018 09:30:16 +0800 [thread overview]
Message-ID: <20181011013015.GA6667@localhost.localdomain> (raw)
In-Reply-To: <20181010171616.GD5533@zn.tnic>
On Wed, Oct 10, 2018 at 07:16:16PM +0200, Borislav Petkov wrote:
>On Wed, Oct 10, 2018 at 04:41:16PM +0800, Chao Fan wrote:
>> In the earliest time, I tried to dig ACPI tabls to solve this problem.
>> But I didn't splite the code in 'compressed/' and ACPI code, so the patch
>> is hard to follow so refused by community.
>> Somebody suggest to add a kernel parameter to specify the
>> immovable memory so that limit kaslr in these regions. Then I make
>> a new patchset. After several versions, Ingo gave a suggestion:
>> https://www.mail-archive.com/linux-kernel@vger.kernel.org/msg1634024.html
>> Follow Ingo's suggestion, imitate the ACPI code to parse the acpi
>> tables, so that the kaslr can get necessary memory information in
>> ACPI tables.
>> I think ACPI code is an independent part, so copy the codes
>> and functions to 'compressed/' directory, so that kaslr won't
>> influence the initialization of ACPI.
>
>You say "copy". I'm still about to look at the code but can those
>functions be carved out in a separate compilation unit which ACPI *and*
>KASLR can both link with so that there's no duplication?
Sorry for my poor English, I used 'copy' but they are not same.
Maybe 'imitate' is better.
Just like I said in my log, The ACPI part need to handle the map
between physical address and virtual address.
But in KASLR part, I remove these operations.
So my code is simplified version.
Thanks,
Chao Fan
>
>--
>Regards/Gruss,
> Boris.
>
>Good mailing practices for 400: avoid top-posting and trim the reply.
>
>
prev parent reply other threads:[~2018-10-11 1:31 UTC|newest]
Thread overview: 56+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-10-10 8:41 [PATCH v8 0/3] x86/boot/KASLR: Parse ACPI table and limit kaslr in immovable memory Chao Fan
2018-10-10 8:41 ` [PATCH v8 1/3] x86/boot: Add acpitb.c to parse acpi tables Chao Fan
2018-10-11 10:57 ` Borislav Petkov
2018-10-12 1:56 ` Chao Fan
2018-10-12 9:36 ` Chao Fan
2018-10-12 9:46 ` Borislav Petkov
2018-10-12 10:03 ` Chao Fan
2018-10-16 2:48 ` Chao Fan
2018-10-16 12:40 ` Borislav Petkov
2018-10-17 1:10 ` Chao Fan
2018-10-15 20:26 ` Masayoshi Mizuma
2018-10-16 1:50 ` Chao Fan
2018-10-10 8:41 ` [PATCH v8 2/3] x86/boot/KASLR: Walk srat tables to filter immovable memory Chao Fan
2018-10-10 8:41 ` [PATCH v8 3/3] x86/boot/KASLR: Limit kaslr to choosing the " Chao Fan
2018-10-10 8:59 ` [PATCH v8 0/3] x86/boot/KASLR: Parse ACPI table and limit kaslr in " Borislav Petkov
2018-10-10 9:06 ` Baoquan He
2018-10-10 9:12 ` Chao Fan
2018-10-10 9:21 ` Baoquan He
2018-10-10 9:14 ` Thomas Gleixner
2018-10-10 9:19 ` Borislav Petkov
2018-10-10 9:30 ` Baoquan He
2018-10-10 19:44 ` Masayoshi Mizuma
2018-10-11 0:29 ` Baoquan He
2018-10-11 5:51 ` Chao Fan
2018-10-13 20:19 ` Masayoshi Mizuma
2018-10-13 20:34 ` Borislav Petkov
2018-10-13 21:45 ` Masayoshi Mizuma
2018-10-13 22:05 ` Borislav Petkov
2018-10-15 0:50 ` Masayoshi Mizuma
2018-10-16 15:13 ` Masayoshi Mizuma
2018-10-16 19:11 ` Borislav Petkov
2018-10-16 19:54 ` Masayoshi Mizuma
2018-10-16 19:59 ` Borislav Petkov
2018-10-22 15:42 ` Masayoshi Mizuma
2018-10-23 2:48 ` Chao Fan
2018-10-24 19:21 ` Masayoshi Mizuma
2018-10-25 1:22 ` Chao Fan
2018-10-25 10:33 ` Borislav Petkov
2018-10-25 13:40 ` Masayoshi Mizuma
2018-11-06 12:10 ` Borislav Petkov
2018-11-06 14:07 ` Baoquan He
2018-11-07 1:21 ` Chao Fan
2018-11-06 18:45 ` Borislav Petkov
2018-11-06 19:36 ` Masayoshi Mizuma
2018-11-06 20:45 ` Borislav Petkov
2018-11-06 22:21 ` Masayoshi Mizuma
2018-11-08 10:51 ` Borislav Petkov
2018-11-10 10:54 ` Borislav Petkov
2018-11-11 13:45 ` Masayoshi Mizuma
2019-02-05 15:05 ` Masayoshi Mizuma
2019-02-08 18:26 ` Borislav Petkov
2019-02-09 0:24 ` Masayoshi Mizuma
2019-02-11 1:46 ` Chao Fan
2019-02-11 20:11 ` Masayoshi Mizuma
2018-10-10 17:16 ` Borislav Petkov
2018-10-11 1:30 ` Chao Fan [this message]
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