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

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Date:	Sun, 18 Jul 2010 15:11:11 -0700 (PDT)
From:	Roland McGrath <roland@...hat.com>
To:	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>
Cc:	x86@...nel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] x86: kprobes: fix swapped segment registers in kretprobe

The following changes since commit bea9a6d239cb2aa2ced4dcb0a05e1827ce61fa3d:

  Merge branch 'upstream-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jlbec/ocfs2 (2010-07-18 10:09:25 -0700)

are available in the git repository at:

  git://git.kernel.org/pub/scm/linux/kernel/git/frob/linux-2.6-roland.git x86/kprobes

Roland McGrath (1):
      x86: kprobes: fix swapped segment registers in kretprobe

 arch/x86/kernel/kprobes.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)


Thanks,
Roland
---
[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.

Signed-off-by: Roland McGrath <roland@...hat.com>
---
 arch/x86/kernel/kprobes.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/arch/x86/kernel/kprobes.c b/arch/x86/kernel/kprobes.c
index 345a4b1..675879b 100644
--- a/arch/x86/kernel/kprobes.c
+++ b/arch/x86/kernel/kprobes.c
@@ -640,8 +640,8 @@ static int __kprobes kprobe_handler(struct pt_regs *regs)
 	/* Skip cs, ip, orig_ax and gs. */	\
 	"	subl $16, %esp\n"	\
 	"	pushl %fs\n"		\
-	"	pushl %ds\n"		\
 	"	pushl %es\n"		\
+	"	pushl %ds\n"		\
 	"	pushl %eax\n"		\
 	"	pushl %ebp\n"		\
 	"	pushl %edi\n"		\
--
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