This is a note to let you know that I've just added the patch titled
x86/vm86/32: Fix POPF emulation
to the 4.9-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-vm86-32-fix-popf-emulation.patch
and it can be found in the queue-4.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From b5069782453459f6ec1fdeb495d9901a4545fcb5 Mon Sep 17 00:00:00 2001
From: Andy Lutomirski <luto@xxxxxxxxxx>
Date: Tue, 13 Mar 2018 22:03:12 -0700
Subject: x86/vm86/32: Fix POPF emulation
From: Andy Lutomirski <luto@xxxxxxxxxx>
commit b5069782453459f6ec1fdeb495d9901a4545fcb5 upstream.
POPF would trap if VIP was set regardless of whether IF was set. Fix it.
Suggested-by: Stas Sergeev <stsp@xxxxxxx>
Reported-by: Bart Oldeman <bartoldeman@xxxxxxxxx>
Signed-off-by: Andy Lutomirski <luto@xxxxxxxxxx>
Cc: Borislav Petkov <bp@xxxxxxxxx>
Cc: Brian Gerst <brgerst@xxxxxxxxx>
Cc: Denys Vlasenko <dvlasenk@xxxxxxxxxx>
Cc: H. Peter Anvin <hpa@xxxxxxxxx>
Cc: Josh Poimboeuf <jpoimboe@xxxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Fixes: 5ed92a8ab71f ("x86/vm86: Use the normal pt_regs area for vm86")
Link: http://lkml.kernel.org/r/ce95f40556e7b2178b6bc06ee9557827ff94bd28.1521003603.git.luto@xxxxxxxxxx
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/x86/kernel/vm86_32.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- a/arch/x86/kernel/vm86_32.c
+++ b/arch/x86/kernel/vm86_32.c
@@ -719,7 +719,8 @@ void handle_vm86_fault(struct kernel_vm8
return;
check_vip:
- if (VEFLAGS & X86_EFLAGS_VIP) {
+ if ((VEFLAGS & (X86_EFLAGS_VIP | X86_EFLAGS_VIF)) ==
+ (X86_EFLAGS_VIP | X86_EFLAGS_VIF)) {
save_v86_state(regs, VM86_STI);
return;
}
Patches currently in stable-queue which might be from luto@xxxxxxxxxx are
queue-4.9/selftests-x86-add-tests-for-the-str-and-sldt-instructions.patch
queue-4.9/x86-speculation-objtool-annotate-indirect-calls-jumps-for-objtool-on-32-bit-kernels.patch
queue-4.9/x86-vm86-32-fix-popf-emulation.patch
queue-4.9/selftests-x86-add-tests-for-user-mode-instruction-prevention.patch
queue-4.9/perf-tools-make-perf_event__synthesize_mmap_events-scale.patch
queue-4.9/x86-mm-fix-vmalloc_fault-to-use-pxd_large.patch
queue-4.9/x86-mm-make-mmap-map_32bit-work-correctly.patch
queue-4.9/selftests-x86-entry_from_vm86-add-test-cases-for-popf.patch
queue-4.9/x86-boot-32-defer-resyncing-initial_page_table-until-per-cpu-is-set-up.patch
queue-4.9/x86-boot-32-fix-up-boot-on-quark-and-possibly-other-platforms.patch
queue-4.9/selftests-x86-entry_from_vm86-exit-with-1-if-we-fail.patch