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authorPeter Zijlstra <peterz@infradead.org>2018-02-09 15:16:59 +0300
committerIngo Molnar <mingo@kernel.org>2018-02-15 03:15:50 +0300
commit3b3a371cc9bc980429baabe0a8e5f307f3d1f463 (patch)
tree6755f9fab548ac10c28a3598bd16c3a5dd301773
parent2b5db66862b95532cb6cca8165ae6eb73633cf85 (diff)
downloadlinux-3b3a371cc9bc980429baabe0a8e5f307f3d1f463.tar.xz
x86/debug: Use UD2 for WARN()
Since the Intel SDM added an ModR/M byte to UD0 and binutils followed that specification, we now cannot disassemble our kernel anymore. This now means Intel and AMD disagree on the encoding of UD0. And instead of playing games with additional bytes that are valid ModR/M and single byte instructions (0xd6 for instance), simply use UD2 for both WARN() and BUG(). Requested-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Acked-by: Linus Torvalds <torvalds@linux-foundation.org> Cc: Andy Lutomirski <luto@kernel.org> Cc: Arjan van de Ven <arjan@linux.intel.com> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Josh Poimboeuf <jpoimboe@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/20180208194406.GD25181@hirez.programming.kicks-ass.net Signed-off-by: Ingo Molnar <mingo@kernel.org>
-rw-r--r--arch/x86/include/asm/bug.h15
-rw-r--r--arch/x86/kernel/traps.c2
2 files changed, 7 insertions, 10 deletions
diff --git a/arch/x86/include/asm/bug.h b/arch/x86/include/asm/bug.h
index 71e6f4bf9161..6804d6642767 100644
--- a/arch/x86/include/asm/bug.h
+++ b/arch/x86/include/asm/bug.h
@@ -5,23 +5,20 @@
#include <linux/stringify.h>
/*
- * Since some emulators terminate on UD2, we cannot use it for WARN.
- * Since various instruction decoders disagree on the length of UD1,
- * we cannot use it either. So use UD0 for WARN.
+ * Despite that some emulators terminate on UD2, we use it for WARN().
*
- * (binutils knows about "ud1" but {en,de}codes it as 2 bytes, whereas
- * our kernel decoder thinks it takes a ModRM byte, which seems consistent
- * with various things like the Intel SDM instruction encoding rules)
+ * Since various instruction decoders/specs disagree on the encoding of
+ * UD0/UD1.
*/
-#define ASM_UD0 ".byte 0x0f, 0xff"
+#define ASM_UD0 ".byte 0x0f, 0xff" /* + ModRM (for Intel) */
#define ASM_UD1 ".byte 0x0f, 0xb9" /* + ModRM */
#define ASM_UD2 ".byte 0x0f, 0x0b"
#define INSN_UD0 0xff0f
#define INSN_UD2 0x0b0f
-#define LEN_UD0 2
+#define LEN_UD2 2
#ifdef CONFIG_GENERIC_BUG
@@ -79,7 +76,7 @@ do { \
#define __WARN_FLAGS(flags) \
do { \
- _BUG_FLAGS(ASM_UD0, BUGFLAG_WARNING|(flags)); \
+ _BUG_FLAGS(ASM_UD2, BUGFLAG_WARNING|(flags)); \
annotate_reachable(); \
} while (0)
diff --git a/arch/x86/kernel/traps.c b/arch/x86/kernel/traps.c
index 446c9ef8cfc3..3d9b2308e7fa 100644
--- a/arch/x86/kernel/traps.c
+++ b/arch/x86/kernel/traps.c
@@ -181,7 +181,7 @@ int fixup_bug(struct pt_regs *regs, int trapnr)
break;
case BUG_TRAP_TYPE_WARN:
- regs->ip += LEN_UD0;
+ regs->ip += LEN_UD2;
return 1;
}