linux-kernel - [PATCH v4 0/3] Add a kernel parameter to change the padding size for KASLR

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-next>] [day] [month] [year] [list]

Message-Id: <20180927203146.12201-1-msys.mizuma@gmail.com>
Date:   Thu, 27 Sep 2018 16:31:43 -0400
From:   Masayoshi Mizuma <msys.mizuma@...il.com>
To:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        Baoquan He <bhe@...hat.com>
Cc:     Masayoshi Mizuma <msys.mizuma@...il.com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH v4 0/3] Add a kernel parameter to change the padding size for KASLR

This patch series are adding an kernel parameter to change
the padding size used for KASLR. It is useful for memory hotplug
capable system. User can adjust the padding size to use it.

It is better if the padding size is calculated automatically,
however, ACPI SRAT is not available at the KASLR initialization
time. So, I add a message for user to tell the suitable padding
size. User can set it on next reboot.

This patch series don't change the current default padding size.

Change log from v3:
 - Add a warning message if the padding size for KASLR is not enough.
   And it says the suitable padding size to user.

Change log from v2:
 - Simplify the description. As Baoquan said, this is similar SGI UV issue,
   but a little different. Remove SGI UV description.

Masayoshi Mizuma (3):
  x86/mm: Add an option to change the padding used for the physical
    memory mapping
  ACPI / NUMA: Add warning message if the padding size for KASLR is not
    enough
  docs: kernel-parameters.txt: document rand_mem_physical_padding
    parameter

 Documentation/admin-guide/kernel-parameters.txt |  7 +++++++
 arch/x86/include/asm/setup.h                    |  2 ++
 arch/x86/mm/kaslr.c                             | 17 ++++++++++++++++-
 drivers/acpi/numa.c                             | 14 ++++++++++++++
 4 files changed, 39 insertions(+), 1 deletion(-)

-- 
2.18.0