Commit 41d31548 authored by Peter Zijlstra's avatar Peter Zijlstra Committed by Greg Kroah-Hartman

x86/debug: Use UD2 for WARN()

commit 3b3a371c upstream.

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
Requested-by: default avatarLinus Torvalds <>
Signed-off-by: default avatarPeter Zijlstra (Intel) <>
Acked-by: default avatarLinus Torvalds <>
Cc: Andy Lutomirski <>
Cc: Arjan van de Ven <>
Cc: Borislav Petkov <>
Cc: Brian Gerst <>
Cc: Denys Vlasenko <>
Cc: H. Peter Anvin <>
Cc: Josh Poimboeuf <>
Cc: Peter Zijlstra <>
Cc: Thomas Gleixner <>
Link: default avatarIngo Molnar <>
Signed-off-by: default avatarGreg Kroah-Hartman <>
parent 4e0067c2
......@@ -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
......@@ -79,7 +76,7 @@ do { \
#define __WARN_FLAGS(flags) \
do { \
annotate_reachable(); \
} while (0)
......@@ -181,7 +181,7 @@ int fixup_bug(struct pt_regs *regs, int trapnr)
regs->ip += LEN_UD0;
regs->ip += LEN_UD2;
return 1;
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