From: "H. Peter Anvin" <hpa@zytor.com>
To: halfdog <me@halfdog.net>, Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>
Cc: x86@kernel.org, linux-kernel@vger.kernel.org
Subject: Re: Sanitize CPU-state when switching from virtual-8086 mode to other task
Date: Sat, 28 Dec 2013 18:37:34 -0800 [thread overview]
Message-ID: <52BF8AEE.6020904@zytor.com> (raw)
In-Reply-To: <52BF4A80.3010503@halfdog.net>
On 12/28/2013 02:02 PM, halfdog wrote:
> It seems that missing CPU-state sanitation during task switching
> triggers kernel-panic. This might be related to unhandled
> FPU-errors. See [1] for POC and serial console log of OOPs. Due to
> missing real 32-bit x86-hardware it is not clear, if this issue
> might be related to subtle differences in virtual-8086 mode
> handling when inside a virtualbox guest.
>
This oops happens inside the guest? Either way, I would be *very*
skeptical of Virtualbox in this case.
You can run a 32-bit kernel on 64-bit hardware, you know...
-hpa
next prev parent reply other threads:[~2013-12-29 2:38 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-12-28 22:02 Sanitize CPU-state when switching from virtual-8086 mode to other task halfdog
2013-12-29 2:37 ` H. Peter Anvin [this message]
2013-12-29 20:44 ` halfdog
2013-12-30 1:18 ` H. Peter Anvin
2013-12-30 15:52 ` halfdog
2013-12-31 18:42 ` H. Peter Anvin
2013-12-31 19:21 ` Konrad Rzeszutek Wilk
2013-12-31 22:40 ` H. Peter Anvin
2014-01-03 23:07 ` Sanitize FPU-state when switching tasks (was sanitize CPU-state when switching from virtual-8086 mode to other task) halfdog
2014-01-08 7:45 ` Sanitize CPU-state " halfdog
2014-01-08 17:42 ` H. Peter Anvin
2014-01-08 19:36 ` Borislav Petkov
2014-01-08 21:28 ` halfdog
2014-01-08 22:39 ` H. Peter Anvin
2014-01-09 22:58 ` Borislav Petkov
2014-01-10 0:42 ` Linus Torvalds
2014-01-10 2:13 ` H. Peter Anvin
2014-01-10 10:06 ` Borislav Petkov
2014-01-10 11:16 ` Linus Torvalds
2014-01-10 11:34 ` Borislav Petkov
2014-01-10 16:11 ` H. Peter Anvin
2014-01-12 3:22 ` [tip:x86/urgent] x86, fpu, amd: Clear exceptions in AMD FXSAVE workaround tip-bot for Linus Torvalds
2014-01-09 22:50 ` Sanitize CPU-state when switching tasks (was sanitize CPU-state when switching from virtual-8086 mode to other task) halfdog
2014-01-09 23:02 ` Borislav Petkov
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