linux-kernel - [PATCH 0/3] x86: Fix panic vs. NMI issues

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: <20150722021421.5155.74460.stgit@softrs>
Date:	Wed, 22 Jul 2015 11:14:21 +0900
From:	Hidehiro Kawai <hidehiro.kawai.ez@...achi.com>
To:	Jonathan Corbet <corbet@....net>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...nel.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Vivek Goyal <vgoyal@...hat.com>
Cc:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>, x86@...nel.org,
	kexec@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linux-doc@...r.kernel.org
Subject: [PATCH 0/3] x86: Fix panic vs. NMI issues

When an HA cluster software or administrator detects non-response
of a host, they issue an NMI to the host to completely stop current
works and take a crash dump.  If the kernel has already panicked
or is capturing a crash dump at that time, further NMI can cause
a crash dump failure.

To solve this issue, this patch set does two things:

- Don't panic on NMI if the kernel has already panicked
- Introduce "noextnmi" boot option which masks external NMI at the
  boot time (supported only for x86)

---

Hidehiro Kawai (3):
      x86/panic: Fix re-entrance problem due to panic on NMI
      kexec: Fix race between panic() and crash_kexec() directly called
      x86/apic: Introduce noextnmi boot option


 Documentation/kernel-parameters.txt |    4 ++++
 arch/x86/kernel/apic/apic.c         |   17 +++++++++++++++-
 arch/x86/kernel/nmi.c               |   18 +++++++++++------
 include/linux/kernel.h              |    4 ++++
 include/linux/kexec.h               |    2 ++
 kernel/kexec.c                      |   12 ++++++++++-
 kernel/panic.c                      |   37 ++++++++++++++++++++++++++---------
 7 files changed, 76 insertions(+), 18 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/