linux-kernel - Re: [PATCH] x86: kprobes: fix swapped segment registers in kretprobe

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Message-ID: <AANLkTinZG9PaA1HexpRtjjm52Q9Oq-GCj4i2sIs1sE1R@mail.gmail.com>
Date:	Sun, 18 Jul 2010 15:31:24 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Roland McGrath <roland@...hat.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Andrew Morton <akpm@...ux-foundation.org>, x86@...nel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86: kprobes: fix swapped segment registers in kretprobe

On Sun, Jul 18, 2010 at 3:11 PM, Roland McGrath <roland@...hat.com> wrote:
>
> [PATCH] x86: kprobes: fix swapped segment registers in kretprobe
>
> In commit f007ea26, the order of the %es and %ds segment registers
> got accidentally swapped, so synthesized 'struct pt_regs' frames
> have the two values inverted.  It's almost sure that these values
> never matter, and that they also never differ.  But wrong is wrong.

Heh, yes. ES and DS are almost guaranteed to be the same, or string
instructions act oddly. But I could imagine that some wine usage could
trigger this. Of course, you'd also have to have probes etc.

Regardless - pulled,

                  Linus
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