This is a note to let you know that I've just added the patch titled
MIPS: Only change $28 to thread_info if coming from user mode
to the 4.4-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:
mips-only-change-28-to-thread_info-if-coming-from-user-mode.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 510d86362a27577f5ee23f46cfb354ad49731e61 Mon Sep 17 00:00:00 2001
From: Matt Redfearn <matt.redfearn@xxxxxxxxxx>
Date: Mon, 19 Dec 2016 14:20:58 +0000
Subject: MIPS: Only change $28 to thread_info if coming from user mode
From: Matt Redfearn <matt.redfearn@xxxxxxxxxx>
commit 510d86362a27577f5ee23f46cfb354ad49731e61 upstream.
The SAVE_SOME macro is used to save the execution context on all
exceptions.
If an exception occurs while executing user code, the stack is switched
to the kernel's stack for the current task, and register $28 is switched
to point to the current_thread_info, which is at the bottom of the stack
region.
If the exception occurs while executing kernel code, the stack is left,
and this change ensures that register $28 is not updated. This is the
correct behaviour when the kernel can be executing on the separate irq
stack, because the thread_info will not be at the base of it.
With this change, register $28 is only switched to it's kernel
conventional usage of the currrent thread info pointer at the point at
which execution enters kernel space. Doing it on every exception was
redundant, but OK without an IRQ stack, but will be erroneous once that
is introduced.
Signed-off-by: Matt Redfearn <matt.redfearn@xxxxxxxxxx>
Acked-by: Jason A. Donenfeld <jason@xxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: James Hogan <james.hogan@xxxxxxxxxx>
Cc: Paul Burton <paul.burton@xxxxxxxxxx>
Cc: linux-mips@xxxxxxxxxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx
Patchwork: https://patchwork.linux-mips.org/patch/14742/
Signed-off-by: Ralf Baechle <ralf@xxxxxxxxxxxxxx>
Signed-off-by: Amit Pundir <amit.pundir@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/mips/include/asm/stackframe.h | 7 +++++++
1 file changed, 7 insertions(+)
--- a/arch/mips/include/asm/stackframe.h
+++ b/arch/mips/include/asm/stackframe.h
@@ -216,12 +216,19 @@
LONG_S $25, PT_R25(sp)
LONG_S $28, PT_R28(sp)
LONG_S $31, PT_R31(sp)
+
+ /* Set thread_info if we're coming from user mode */
+ mfc0 k0, CP0_STATUS
+ sll k0, 3 /* extract cu0 bit */
+ bltz k0, 9f
+
ori $28, sp, _THREAD_MASK
xori $28, _THREAD_MASK
#ifdef CONFIG_CPU_CAVIUM_OCTEON
.set mips64
pref 0, 0($28) /* Prefetch the current pointer */
#endif
+9:
.set pop
.endm
Patches currently in stable-queue which might be from matt.redfearn@xxxxxxxxxx are
queue-4.4/mips-only-change-28-to-thread_info-if-coming-from-user-mode.patch
queue-4.4/mips-stack-unwinding-while-on-irq-stack.patch
queue-4.4/mips-introduce-irq_stack.patch