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