linux-kernel - [tip:x86/urgent] x86/refcounts: Switch to UD2 for exceptions

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Date:   Wed, 28 Feb 2018 06:21:48 -0800
From:   tip-bot for Kees Cook <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, hpa@...or.com, peterz@...radead.org,
        keescook@...omium.org, mingo@...nel.org, tglx@...utronix.de
Subject: [tip:x86/urgent] x86/refcounts: Switch to UD2 for exceptions

Commit-ID:  cb097be7036aa325adba33d8c41fe77b980b0e77
Gitweb:     https://git.kernel.org/tip/cb097be7036aa325adba33d8c41fe77b980b0e77
Author:     Kees Cook <keescook@...omium.org>
AuthorDate: Sun, 25 Feb 2018 08:50:56 -0800
Committer:  Thomas Gleixner <tglx@...utronix.de>
CommitDate: Wed, 28 Feb 2018 15:18:40 +0100

x86/refcounts: Switch to UD2 for exceptions

As done in commit 3b3a371cc9bc ("x86/debug: Use UD2 for WARN()"), this
switches to UD2 from UD0 to keep disassembly readable.

Signed-off-by: Kees Cook <keescook@...omium.org>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Cc: Peter Zijlstra <peterz@...radead.org>
Link: https://lkml.kernel.org/r/20180225165056.GA11719@beast

---
 arch/x86/include/asm/refcount.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/include/asm/refcount.h b/arch/x86/include/asm/refcount.h
index d65171120e90..4cf11d88d3b3 100644
--- a/arch/x86/include/asm/refcount.h
+++ b/arch/x86/include/asm/refcount.h
@@ -17,7 +17,7 @@
 #define _REFCOUNT_EXCEPTION				\
 	".pushsection .text..refcount\n"		\
 	"111:\tlea %[counter], %%" _ASM_CX "\n"		\
-	"112:\t" ASM_UD0 "\n"				\
+	"112:\t" ASM_UD2 "\n"				\
 	ASM_UNREACHABLE					\
 	".popsection\n"					\
 	"113:\n"					\