linux-kernel - Re: [PATCH] x86/kexec: Exclude GART aperture from vmcore

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Date:   Tue, 7 Nov 2017 16:34:28 +0100
From:   Jiri Bohac <jbohac@...e.cz>
To:     Baoquan He <bhe@...hat.com>
Cc:     David Airlie <airlied@...ux.ie>, Dave Young <dyoung@...hat.com>,
        Vivek Goyal <vgoyal@...hat.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Toshi Kani <toshi.kani@....com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>, linux-kernel@...r.kernel.org,
        kexec@...ts.infradead.org, Borislav Petkov <bp@...en8.de>
Subject: Re: [PATCH] x86/kexec: Exclude GART aperture from vmcore

On Tue, Nov 07, 2017 at 02:42:12PM +0100, Jiri Bohac wrote:
> On Tue, Nov 07, 2017 at 07:39:56PM +0800, Baoquan He wrote:
> > don't worry about the user space kexec utility either. 
> 
> What's the problem with the userspace kexec? The bug is in
> reading /proc/vmcore by makedumpfile. kexec would only operate
> within the preallocated crashkernel area, right?

right, I see it (without -s the kexec userspace creates the ELF header
later used the second kernel for /proc/vmcore).

No idea how to fix that nicely...

-- 
Jiri Bohac <jbohac@...e.cz>
SUSE Labs, Prague, Czechia