This is a note to let you know that I've just added the patch titled
x86/boot, objtool: Annotate indirect jump in secondary_startup_64()
to the 4.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
x86-boot-objtool-annotate-indirect-jump-in-secondary_startup_64.patch
and it can be found in the queue-4.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From bd89004f6305cbf7352238f61da093207ee518d6 Mon Sep 17 00:00:00 2001
From: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Date: Tue, 16 Jan 2018 10:38:09 +0100
Subject: x86/boot, objtool: Annotate indirect jump in secondary_startup_64()
From: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
commit bd89004f6305cbf7352238f61da093207ee518d6 upstream.
The objtool retpoline validation found this indirect jump. Seeing how
it's on CPU bringup before we run userspace it should be safe, annotate
it.
Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
Reviewed-by: David Woodhouse <dwmw@xxxxxxxxxxxx>
Acked-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Acked-by: Josh Poimboeuf <jpoimboe@xxxxxxxxxx>
Cc: Andy Lutomirski <luto@xxxxxxxxxx>
Cc: Arjan van de Ven <arjan@xxxxxxxxxxxxxxx>
Cc: Borislav Petkov <bp@xxxxxxxxx>
Cc: Dan Williams <dan.j.williams@xxxxxxxxx>
Cc: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
Cc: David Woodhouse <dwmw2@xxxxxxxxxxxxx>
Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/x86/kernel/head_64.S | 2 ++
1 file changed, 2 insertions(+)
--- a/arch/x86/kernel/head_64.S
+++ b/arch/x86/kernel/head_64.S
@@ -23,6 +23,7 @@
#include <asm/nops.h>
#include "../entry/calling.h"
#include <asm/export.h>
+#include <asm/nospec-branch.h>
#ifdef CONFIG_PARAVIRT
#include <asm/asm-offsets.h>
@@ -134,6 +135,7 @@ ENTRY(secondary_startup_64)
/* Ensure I am executing from virtual addresses */
movq $1f, %rax
+ ANNOTATE_RETPOLINE_SAFE
jmp *%rax
1:
UNWIND_HINT_EMPTY
Patches currently in stable-queue which might be from peterz@xxxxxxxxxxxxx are
queue-4.15/x86-boot-objtool-annotate-indirect-jump-in-secondary_startup_64.patch
queue-4.15/x86-retpoline-support-retpoline-builds-with-clang.patch
queue-4.15/x86-ldt-avoid-warning-in-32-bit-builds-with-older-gcc.patch
queue-4.15/x86-entry-reduce-the-code-footprint-of-the-idtentry-macro.patch
queue-4.15/bug-use-pb-in-bug-and-stack-protector-failure.patch
queue-4.15/revert-x86-retpoline-simplify-vmexit_fill_rsb.patch
queue-4.15/nospec-include-asm-barrier.h-dependency.patch
queue-4.15/x86-mm-remove-stale-comment-about-kmemcheck.patch
queue-4.15/x86-mm-sme-objtool-annotate-indirect-call-in-sme_encrypt_execute.patch
queue-4.15/x86-speculation-use-ibrs-if-available-before-calling-into-firmware.patch
queue-4.15/x86-asm-improve-how-gen_-_suffixed_rmwcc-specify-clobbers.patch
queue-4.15/x86-64-realmode-add-instruction-suffix.patch
queue-4.15/x86-speculation-objtool-annotate-indirect-calls-jumps-for-objtool.patch
queue-4.15/x86-paravirt-objtool-annotate-indirect-calls.patch
queue-4.15/x86-entry-64-use-xorl-for-faster-register-clearing.patch
queue-4.15/nospec-kill-array_index_nospec_mask_check.patch
queue-4.15/lib-bug.c-exclude-non-bug-warn-exceptions-from-report_bug.patch
queue-4.15/x86-io-apic-avoid-warning-in-32-bit-builds.patch