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Message-ID: <52F52EDA.4080007@linux.intel.com>
Date: Fri, 07 Feb 2014 11:07:06 -0800
From: "H. Peter Anvin" <hpa@linux.intel.com>
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To: Vivek Goyal <vgoyal@redhat.com>, Kees Cook <keescook@chromium.org>
CC: "H. Peter Anvin" <hpa@zytor.com>,
        Richard Weinberger <richard.weinberger@gmail.com>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Cong Ding <dinggnu@gmail.com>, Ingo Molnar <mingo@elte.hu>,
        Ingo Molnar <mingo@kernel.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Mathias Krause <minipli@googlemail.com>,
        Michael Davidson <md@google.com>, Thomas Gleixner <tglx@linutronix.de>,
        Wei Yongjun <yongjun_wei@trendmicro.com.cn>,
        Dave Young <dyoung@redhat.com>
Subject: Re: [GIT PULL] x86/kaslr for v3.14
References: <201401201647.s0KGlZdh004167@tazenda.hos.anvin.org> <CAFLxGvxO1MPDDjEh3FU5Gv2-eb6zBJxYtTnKdABDTTpbMxxYAw@mail.gmail.com> <52E5EFAF.3060609@linux.intel.com> <CAFLxGvxJ0A6hZ52RWffkg_zXXScyPn10P4HcKvdAXfE43h32Eg@mail.gmail.com> <52E601DA.7010605@zytor.com> <20140130220708.GP9951@redhat.com> <CAGXu5jKp0j71ucE7uOWRa+gQM1Wzp=_KdByJK4XnACTwiCW4ow@mail.gmail.com> <20140207144914.GA5949@redhat.com>
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On 02/07/2014 06:49 AM, Vivek Goyal wrote:
> 
> As a workaround, Dave is currently using "nokaslr" command line parameter
> for second kernel. He is still facing issues where makedumpfile segment
> faults. He is looking into it further.
> 

Now, let's state this: kaslr for kdump is almost certainly useless (the
amount of reserved memory is not enough to provide any meaningful
randomization, so any randomization needs to happen during the memory
reservation phase.)  So disabling kaslr in the kdump kernel is entirely
appropriate.

	-hpa


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