This is a note to let you know that I've just added the patch titled
ARM: 8670/1: V7M: Do not corrupt vector table around v7m_invalidate_l1 call
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:
arm-8670-1-v7m-do-not-corrupt-vector-table-around-v7m_invalidate_l1-call.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 6d80594936914e798b1b54b3bfe4bd68d8418966 Mon Sep 17 00:00:00 2001
From: Vladimir Murzin <vladimir.murzin@xxxxxxx>
Date: Mon, 24 Apr 2017 10:40:48 +0100
Subject: ARM: 8670/1: V7M: Do not corrupt vector table around v7m_invalidate_l1 call
From: Vladimir Murzin <vladimir.murzin@xxxxxxx>
commit 6d80594936914e798b1b54b3bfe4bd68d8418966 upstream.
We save/restore registers around v7m_invalidate_l1 to address pointed
by r12, which is vector table, so the first eight entries are
overwritten with a garbage. We already have stack setup at that stage,
so use it to save/restore register.
Fixes: 6a8146f420be ("ARM: 8609/1: V7M: Add support for the Cortex-M7 processor")
Signed-off-by: Vladimir Murzin <vladimir.murzin@xxxxxxx>
Signed-off-by: Russell King <rmk+kernel@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/arm/mm/proc-v7m.S | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
--- a/arch/arm/mm/proc-v7m.S
+++ b/arch/arm/mm/proc-v7m.S
@@ -147,10 +147,10 @@ __v7m_setup_cont:
@ Configure caches (if implemented)
teq r8, #0
- stmneia r12, {r0-r6, lr} @ v7m_invalidate_l1 touches r0-r6
+ stmneia sp, {r0-r6, lr} @ v7m_invalidate_l1 touches r0-r6
blne v7m_invalidate_l1
teq r8, #0 @ re-evalutae condition
- ldmneia r12, {r0-r6, lr}
+ ldmneia sp, {r0-r6, lr}
@ Configure the System Control Register to ensure 8-byte stack alignment
@ Note the STKALIGN bit is either RW or RAO.
Patches currently in stable-queue which might be from vladimir.murzin@xxxxxxx are
queue-4.9/arm-8670-1-v7m-do-not-corrupt-vector-table-around-v7m_invalidate_l1-call.patch