From 8d306f53b63099fec2d56300149e400d181ba4f5 Mon Sep 17 00:00:00 2001 From: Heiko Carstens Date: Mon, 4 Dec 2017 09:42:45 +0100 Subject: [PATCH] s390/mm: fix off-by-one bug in 5-level page table handling Martin Cermak reported that setting a uprobe doesn't work. Reason for this is that the common uprobes code tries to get an unmapped area at the last possible page within an address space. This broke with commit 1aea9b3f9210 ("s390/mm: implement 5 level pages tables") which introduced an off-by-one bug which prevents to map anything at the last possible page within an address space. The check with the off-by-one bug however can be removed since with commit 8ab867cb0806 ("s390/mm: fix BUG_ON in crst_table_upgrade") the necessary check is done at both call sites. Reported-by: Martin Cermak Bisected-by: Thomas Richter Fixes: 1aea9b3f9210 ("s390/mm: implement 5 level pages tables") Cc: # v4.13+ Reviewed-by: Hendrik Brueckner Signed-off-by: Heiko Carstens Signed-off-by: Martin Schwidefsky --- arch/s390/mm/pgalloc.c | 2 -- 1 file changed, 2 deletions(-) diff --git a/arch/s390/mm/pgalloc.c b/arch/s390/mm/pgalloc.c index 434a9564917b..cb364153c43c 100644 --- a/arch/s390/mm/pgalloc.c +++ b/arch/s390/mm/pgalloc.c @@ -83,8 +83,6 @@ int crst_table_upgrade(struct mm_struct *mm, unsigned long end) /* upgrade should only happen from 3 to 4, 3 to 5, or 4 to 5 levels */ VM_BUG_ON(mm->context.asce_limit < _REGION2_SIZE); - if (end >= TASK_SIZE_MAX) - return -ENOMEM; rc = 0; notify = 0; while (mm->context.asce_limit < end) {