linux-kernel - Re: [PATCH v2 08/10] x86-64: Emulate vsyscalls

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]

Date:	Mon, 30 May 2011 10:07:12 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Jan Beulich <JBeulich@...ell.com>
Cc:	Andy Lutomirski <luto@....EDU>, Borislav Petkov <bp@...en8.de>,
	Jesper Juhl <jj@...osbits.net>,
	richard -rw- weinberger <richard.weinberger@...il.com>,
	Arjan van de Ven <arjan@...radead.org>,
	Mikael Pettersson <mikpe@...uu.se>, x86@...nel.org,
	Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 08/10] x86-64: Emulate vsyscalls


* Jan Beulich <JBeulich@...ell.com> wrote:

> >>> On 30.05.11 at 05:48, Andy Lutomirski <luto@....EDU> wrote:
> > This causes vsyscalls to be a little more expensive than real
> > syscalls.  Fortunately sensible programs don't use them.
> 
> Hmm - weren't vsyscalls there for performance reasons?

New code uses the vDSO. The fixed-address vsyscalls are apparently 
only used in esoteric cases like statically linked glibc binaries. 
(which should arguably be using the vDSO as well)

Thanks,

	Ingo
--
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/