linux-kernel - Re: pt_regs leak into userspace (was Re: [PATCH v3 20/71] ARC: Signal handling)

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: <CACM3HyGNZxfOXpw01POBVT-YcVKQsnPkO6Kgg+epfZS-x-BRCg@mail.gmail.com>
Date:	Mon, 11 Feb 2013 10:36:38 +0100
From:	Jonas Bonn <jonas.bonn@...il.com>
To:	Vineet Gupta <Vineet.Gupta1@...opsys.com>
Cc:	Arnd Bergmann <arnd@...db.de>,
	"linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Al Viro <viro@...iv.linux.org.uk>
Subject: Re: pt_regs leak into userspace (was Re: [PATCH v3 20/71] ARC: Signal handling)

On 11 February 2013 08:26, Vineet Gupta <Vineet.Gupta1@...opsys.com> wrote:

>
> The only downside of this patch is that userspace signal stack grows in size,
> since signal frame only cares about scratch regs (pt_regs), but has to accommodate
> unused placeholder for callee regs too by virtue of using user_regs_struct.

Is this really true?  Don't setcontext and friends require that _all_
the registers be part of sigcontext?

/Jonas
--
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/