This is a note to let you know that I've just added the patch titled
parisc: Fix map_pages() to not overwrite existing pte entries
to the 4.14-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:
parisc-fix-map_pages-to-not-overwrite-existing-pte-entries.patch
and it can be found in the queue-4.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 3c229b3f2dd8133f61bb81d3cb018be92f4bba39 Mon Sep 17 00:00:00 2001
From: Helge Deller <deller@xxxxxx>
Date: Fri, 12 Oct 2018 22:37:46 +0200
Subject: parisc: Fix map_pages() to not overwrite existing pte entries
From: Helge Deller <deller@xxxxxx>
commit 3c229b3f2dd8133f61bb81d3cb018be92f4bba39 upstream.
Fix a long-existing small nasty bug in the map_pages() implementation which
leads to overwriting already written pte entries with zero, *if* map_pages() is
called a second time with an end address which isn't aligned on a pmd boundry.
This happens for example if we want to remap only the text segment read/write
in order to run alternative patching on the code. Exiting the loop when we
reach the end address fixes this.
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Helge Deller <deller@xxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/parisc/mm/init.c | 8 ++------
1 file changed, 2 insertions(+), 6 deletions(-)
--- a/arch/parisc/mm/init.c
+++ b/arch/parisc/mm/init.c
@@ -495,12 +495,8 @@ static void __init map_pages(unsigned lo
pte = pte_mkhuge(pte);
}
- if (address >= end_paddr) {
- if (force)
- break;
- else
- pte_val(pte) = 0;
- }
+ if (address >= end_paddr)
+ break;
set_pte(pg_table, pte);
Patches currently in stable-queue which might be from deller@xxxxxx are
queue-4.14/parisc-fix-map_pages-to-not-overwrite-existing-pte-entries.patch
queue-4.14/parisc-fix-address-in-hpmc-iva.patch
queue-4.14/parisc-fix-exported-address-of-os_hpmc-handler.patch
