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@chromium.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20180225165056.GA11719@beast

diff --git a/arch/x86/include/asm/refcount.h b/arch/x86/include/asm/refcount.h
index d651711..4cf11d8 100644 (file)
--- 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"                                        \