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  PHC 
Open Source and information security mailing list archives
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date:   Fri, 8 Oct 2021 05:56:38 -0500
From:   Bjorn Helgaas <>
To:     Borislav Petkov <>
Cc:     Mika Westerberg <>,
        Werner Sembach <>,,,,,,,,,
Subject: Re: [PATCH RESEND] x86/resource: Do not exclude regions that are
 marked as MMIO in EFI memmap

[+cc linux-pci]

On Fri, Oct 08, 2021 at 11:45:38AM +0200, Borislav Petkov wrote:
> On Fri, Oct 08, 2021 at 12:23:31PM +0300, Mika Westerberg wrote:
> > Hi,
> > 
> > On Fri, Oct 08, 2021 at 10:55:49AM +0200, Werner Sembach wrote:
> > > Is there any update on this matter? Also happens on discrete Thunderbolt 4 chips:
> > >
> > 
> > AFAICT no updates.
> > 
> > @Bjorn, x86 maintainers,
> > 
> > If there are no alternatives can we get this patch merged so that people
> > don't need to carry out-of-tree patches to get their systems working?
> Just my 2ยข from briefly skimming over this:
> So this reads yet again as BIOS is to blame but what else is new?
> "All in all, I think we can fix this by modifying
> arch_remove_reservations() to check the EFI type as well and if it is
> EFI_MEMORY_MAPPED_IO skip the clipping in that case."
> And this like we should trust EFI to mark those regions properly, which
> is more of the same but in different color.
> That original commit talks about windoze doing a different allocation
> scheme and thus not trusting the untrustworthy firmware anyway and that
> sounds like something we should do too. But WTH do I know?!

There are a couple other threads reporting similar issues:

I think 4dc2287c1805 ("x86: avoid E820 regions when allocating address
space") was a mistake and we should remove that instead of adding more
complexity to it.

But that requires another approach to fix the issue that 4dc2287c1805


Powered by blists - more mailing lists