linux-kernel - Re: [PATCH v2] x86/boot: Use efi_setup_data for searching RSDP on kexec-ed kernel

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 for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Thu, 4 Apr 2019 10:52:34 +0800
From:   Dave Young <dyoung@...hat.com>
To:     Junichi Nomura <j-nomura@...jp.nec.com>
Cc:     Chao Fan <fanc.fnst@...fujitsu.com>,
        Borislav Petkov <bp@...en8.de>,
        "bhe@...hat.com" <bhe@...hat.com>,
        "kasong@...hat.com" <kasong@...hat.com>,
        "x86@...nel.org" <x86@...nel.org>,
        "kexec@...ts.infradead.org" <kexec@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] x86/boot: Use efi_setup_data for searching RSDP on
 kexec-ed kernel

On 04/04/19 at 01:23am, Junichi Nomura wrote:
> Hi Dave and Chao,
> 
> On 4/3/19 6:02 PM, Chao Fan wrote:
> > On Wed, Apr 03, 2019 at 04:23:06PM +0800, Chao Fan wrote:
> >> On Wed, Apr 03, 2019 at 04:09:16PM +0800, Dave Young wrote:
> >>> Fix 3.  need more debugging, have you or Junichi run tests on more real
> >>> hardware, maybe it is easier to reproduce on real hardware, I'm glad to
> >>> help to try test patch or provide any help. 
> >>
> >> I am still testing in real hardware.
> > 
> > Hi Dave,
> > 
> > I find a Fujitsu Desktop PC to test it.
> > Without this PATCH, it failed to kexec and kdump.
> > With this PATCH, it succeed to kexec.
> > But failed to kdump. From the log, I think it didn't jump to the second
> > kernel, just reboot after panic. I have not figured out what's the
> > problem, but it seems not caused by this PATCH.
> > So I still think this PATCH works for the Fujitsu Desktop PC.
> > 
> > As for your issue, I think there may be some problems related to specified
> > hardware. Are you using a Lenovo laptop?
> > 
> > And I am not sure how Nomura tested it.
> 
> I've tested 3 different models of EFI-booted baremetal servers with both
> normal kexec and panic kexec.  So far as I've tried Linus's v5.1-rc3,
> the problem always reproduced without the patch and disappears with the patch.

Hmm, both of my two laptops (Thinkpad T480s and T420) failed to boot with kexec.

I will see if I can find something, but it may need more time because
early console does not work especially after kexec.

Thanks
Dave