4.18-stable review patch. If anyone has any objections, please let me know.
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From: Helge Deller deller@gmx.de
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@vger.kernel.org Signed-off-by: Helge Deller deller@gmx.de Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- 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);