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:	Mon, 10 Nov 2014 15:37:34 -0500
From:	Austin S Hemmelgarn <>
To:	Matthew Garrett <>
CC:	Pali Rohár <>,
	Matt Fleming <>,
	Borislav Petkov <>,
	Mark Salter <>,
	Alessandro Zummo <>,,,, Dave Young <>,
	"H. Peter Anvin" <>
Subject: Re: [PATCH] rtc: Disable EFI rtc for x86

On 2014-11-10 12:04, Matthew Garrett wrote:
> On Mon, Nov 10, 2014 at 11:45:06AM -0500, Austin S Hemmelgarn wrote:
>> I agree, without it you need PC CMOS RTC support to access the RTC
>> on most systems, which in turn means that you have to enable the CSM
>> in the EFI firmware, which is annoying cause you can't easily dual
>> boot windows with secure boot when the CSM is enabled.
> CMOS RTC support doesn't depend on the CSM.
That's really interesting, because with it compiled in, I can't boot on 
my EFI based thinkpad laptop without telling EFI to launch the CSM, and 
with it compiled out, I can boot fine without the CSM.  I'll have to 
look further into the options I have set in my kernel build, I may have 
changed something else without remembering between booting with and 
without the CSM enabled.

Download attachment "smime.p7s" of type "application/pkcs7-signature" (2455 bytes)

Powered by blists - more mailing lists