linux-kernel - Re: [PATCH] xen/x86: Adjust stack pointer in xen

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: Windows password security audit tool. GUI, reports in PDF.

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

Message-ID: <564A50C3.1000200@zytor.com>
Date:	Mon, 16 Nov 2015 13:55:15 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Borislav Petkov <bp@...en8.de>,
	Andy Lutomirski <luto@...capital.net>
Cc:	Boris Ostrovsky <boris.ostrovsky@...cle.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	xen-devel <xen-devel@...ts.xen.org>,
	David Vrabel <david.vrabel@...rix.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Subject: Re: [PATCH] xen/x86: Adjust stack pointer in xen_sysexit

On 11/16/15 12:22, Borislav Petkov wrote:
> 
> Huh, so what's wrong with a jump:
> 
> 	jmp 1f
> 	swapgs
> 	1:
> 

What is the point of that jump?

>> If it would make you feel better, it could be X86_BUG_XENPV :-p
> 
> That doesn't matter - I just don't want to open the flood gates on
> pseudo feature bits.
> 
> hpa, what do you think?

Pseudo feature bits are fine, we already have plenty of them.  They make
sense as they let us reuse a lot of infrastructure.

	-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/