linux-kernel - [PATCH 0/4] Handle memmap and mem kernel options in boot stage kaslr

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Message-Id: <1492436099-4017-1-git-send-email-bhe@redhat.com>
Date:   Mon, 17 Apr 2017 21:34:55 +0800
From:   Baoquan He <bhe@...hat.com>
To:     linux-kernel@...r.kernel.org
Cc:     keescook@...omium.org, dave.jiang@...el.com,
        dan.j.williams@...el.com, hpa@...or.com, tglx@...utronix.de,
        mingo@...nel.org, dyoung@...hat.com, Baoquan He <bhe@...hat.com>
Subject: [PATCH 0/4] Handle memmap and mem kernel options in boot stage kaslr

People reported kernel panic occurs during system boots up with mem boot option.
After checking code, several problems are found about memmap= and mem= in boot stage
kaslr.

*) In commit f28442497b5c ("x86/boot: Fix KASLR and memmap= collision"), only one memmap
   entry is considered and only the last one if multiple memmap entries are specified.

*) mem= and memmap=nn[KMG] are not considered yet. They are used to limit max address
   of system. Kernel can't be randomized to be above the limit.

*) kernel-parameters.txt doesn't tell the updated behaviour of memmap=.

This patchset tries to solve above issues.

Baoquan He (4):
  param: Move function next_arg to lib/cmdline.c for later reuse
  KASLR: Parse all memmap entries in cmdline
  KASLR: Handle memory limit specified by memmap and mem option
  doc: Update description about memmap option in kernel-parameter.txt

 Documentation/admin-guide/kernel-parameters.txt |   9 ++
 arch/x86/boot/compressed/cmdline.c              |   2 +-
 arch/x86/boot/compressed/kaslr.c                | 161 ++++++++++++++----------
 arch/x86/boot/string.c                          |   8 ++
 include/linux/kernel.h                          |   1 +
 kernel/params.c                                 |  52 --------
 lib/cmdline.c                                   |  57 +++++++++
 7 files changed, 172 insertions(+), 118 deletions(-)

-- 
2.5.5