xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

s390/mm: Fix crst upgrade of mmap with MAP_FIXED

Browse Source 
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 <brueckner@linux.vnet.ibm.com>
Reviewed-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Hendrik Brueckner
2013-02-11 14:29:49 +01:00
committed by Martin Schwidefsky
parent a4e69245bd
commit 486c0a0bc8
2 changed files with 8 additions and 5 deletions
Download Patch File Download Diff File Expand all files Collapse all files

9
arch/s390/mm/mmap.c
View File

@@ -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;