From: WANG Cong <xiyou.wangcong@gmail.com>
To: Jeff Dike <jdike@addtoit.com>
Cc: akpm@osdl.org, WANG Cong <xiyou.wangcong@gmail.com>,
linux-kernel@vger.kernel.org,
user-mode-linux-devel@lists.sourceforge.net
Subject: Re: [uml-devel] [PATCH 9/19] UML - Tidy ptrace interface
Date: Tue, 29 Apr 2008 16:14:25 +0800 (CST) [thread overview]
Message-ID: <alpine.LFD.1.00.0804291613570.2548@localhost.localdomain> (raw)
In-Reply-To: <20080428154240.GD7334@c2.user-mode-linux.org>
On Mon, 28 Apr 2008, Jeff Dike wrote:
> On Sat, Apr 26, 2008 at 05:35:38PM +0800, WANG Cong wrote:
>> From: Jeff Dike <jdike@addtoit.com>
>> Date: Fri, 25 Apr 2008 13:56:10 -0400
>> > Tidy the ptrace interface code. Removed a bunch of unused macros.
>> > Started converting register sets from arrays of longs to structures.
>>
>> Could you please explain a bit why do this? I think long arrary is OK.
>
> It's wrong on x86_64. There, FRAME_SIZE is 168 -
> #define FRAME_SIZE
> and SS is the last register defined -
> #define SS 160
> but there are a number of registers beyond that in the user_regs_struct:
> unsigned long ss;
> unsigned long fs_base;
> unsigned long gs_base;
> unsigned long ds;
> unsigned long es;
> unsigned long fs;
> unsigned long gs;
>
> The effect of GETREGS into a long[FRAME_SIZE] will be stack corruption.
>
Thanks for teaching this. ;-)
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prev parent reply other threads:[~2008-04-29 8:15 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-04-25 17:56 [uml-devel] [PATCH 9/19] UML - Tidy ptrace interface Jeff Dike
2008-04-26 9:35 ` WANG Cong
2008-04-28 15:42 ` Jeff Dike
2008-04-29 8:14 ` WANG Cong [this message]
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