linux-kernel - [RFC V2 PATCH 0/1] kexec: crash_kexec_post

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: <20150724011615.6834.79628.stgit@softrs>
Date:	Fri, 24 Jul 2015 10:16:15 +0900
From:	Hidehiro Kawai <hidehiro.kawai.ez@...achi.com>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Vivek Goyal <vgoyal@...hat.com>
Cc:	linux-mips@...ux-mips.org, Baoquan He <bhe@...hat.com>,
	kexec@...ts.infradead.org, linux-kernel@...r.kernel.org,
	HATAYAMA Daisuke <d.hatayama@...fujitsu.com>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Daniel Walker <dwalker@...o99.com>,
	Ingo Molnar <mingo@...nel.org>
Subject: [RFC V2 PATCH 0/1] kexec: crash_kexec_post_notifiers boot option
 related fixes

This is a bugfix patch for crash_kexec_post_notifiers boot option
which allows users to call panic notifiers and kmsg dumpers before
kdump.

This fixes one of the problems reported by Daniel Walker
(https://lkml.org/lkml/2015/6/24/44). 

 Problem 1:
 If crash_kexec_post_notifiers boot option is specified, some
 shutting down process which assume other cpus are still alive
 don't work properly.

 Problem 2 (addressed by this patch):
 If crash_kexec_post_notifiers boot option is specified, register
 information of other cpus are not saved to crash dumps.

Following Vivek's opinion, this patch replaces smp_send_stop()
in panic() with suitable version for crash_kexec which saves
cpu states and other things like cleaning up VMX/SVM.  Since this
needs architecture specific implementation and it's not so trivial,
this version only support for x86.  So the problem 1, known to
happen on MIPS/OCTEON, is not addressed now.

To keep the modification impact low, this patch doesn't change
the logic basically if crash_kexec_post_notifiers is not specified.

Please note that crash_kexec() can be called directly without
entering panic().  Stopping other cpus functionality is still
needed in crash_kexec().

Changes in V2:
- Replace smp_send_stop() call with crash_kexec version which
  saves cpu states and does cleanups instead of changing execution
  flow
- Drop a fix for Problem 1
- Drop other patches because they aren't needed anymore

V1: https://lkml.org/lkml/2015/7/10/316

---

Hidehiro Kawai (1):
      panic/x86: Replace smp_send_stop() with crash_kexec version

 arch/x86/kernel/crash.c |   16 +++++++++++-----
 kernel/panic.c          |   29 +++++++++++++++++++++++------
 2 files changed, 34 insertions(+), 11 deletions(-)

-- 
Hidehiro Kawai
Hitachi, Ltd. Research & Development Group

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/