linux-kernel - Re: EFI mixed mode + perf = rampant triple faults

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, 15 Jan 2015 11:59:42 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Matt Fleming <matt@...sole-pimps.org>,
	Andy Lutomirski <luto@...capital.net>
CC:	LKML <linux-kernel@...r.kernel.org>,
	"linux-efi@...r.kernel.org" <linux-efi@...r.kernel.org>,
	Borislav Petkov <bp@...en8.de>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>
Subject: Re: EFI mixed mode + perf = rampant triple faults

On 01/15/2015 11:41 AM, Matt Fleming wrote:
>>
>> Tianocore makes assumptions about the kernel's GDT layout?  Yuck.
>
> No, but 32-bit Tianocore does rely on the second GDT entry being a
> 32-bit CS.
>
> It has no knowledge of Linux's GDT layout.
>

If it assumes that descriptor 16 is a 32-bit CS (and what about data? 
24?) that *is* making assumptions on the kernel.

	-hpa

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/