From 486c0a0bc80d370471b21662bf03f04fbb37cdc6 Mon Sep 17 00:00:00 2001 From: Hendrik Brueckner Date: Mon, 11 Feb 2013 14:29:49 +0100 Subject: s390/mm: Fix crst upgrade of mmap with MAP_FIXED Right now the page table upgrade does not happen if the end address of a fixed mapping is greater than TASK_SIZE. Enhance s390_mmap_check() to handle MAP_FIXED mappings correctly. Signed-off-by: Hendrik Brueckner Reviewed-by: Heiko Carstens Signed-off-by: Martin Schwidefsky --- arch/s390/mm/mmap.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) (limited to 'arch/s390/mm') diff --git a/arch/s390/mm/mmap.c b/arch/s390/mm/mmap.c index c59a5efa58b1..06bafec00278 100644 --- a/arch/s390/mm/mmap.c +++ b/arch/s390/mm/mmap.c @@ -101,12 +101,15 @@ void arch_pick_mmap_layout(struct mm_struct *mm) #else -int s390_mmap_check(unsigned long addr, unsigned long len) +int s390_mmap_check(unsigned long addr, unsigned long len, unsigned long flags) { int rc; - if (!is_compat_task() && - len >= TASK_SIZE && TASK_SIZE < (1UL << 53)) { + if (is_compat_task() || (TASK_SIZE >= (1UL << 53))) + return 0; + if (!(flags & MAP_FIXED)) + addr = 0; + if ((addr + len) >= TASK_SIZE) { rc = crst_table_upgrade(current->mm, 1UL << 53); if (rc) return rc; -- cgit v1.2.3