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| author | Hendrik Brueckner <brueckner@linux.vnet.ibm.com> | 2013-02-11 14:29:49 +0100 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2013-02-14 15:55:22 +0100 |
| commit | 486c0a0bc80d370471b21662bf03f04fbb37cdc6 (patch) | |
| tree | 29b538296d454871ba0b4dd9802e0e154eb2102b /arch/s390/mm | |
| parent | a4e69245bd7793a620ed67442c00fa1f2dd56891 (diff) | |
| download | linux-486c0a0bc80d370471b21662bf03f04fbb37cdc6.tar.gz linux-486c0a0bc80d370471b21662bf03f04fbb37cdc6.tar.bz2 linux-486c0a0bc80d370471b21662bf03f04fbb37cdc6.zip | |
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 <brueckner@linux.vnet.ibm.com>
Reviewed-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/mm')
| -rw-r--r-- | arch/s390/mm/mmap.c | 9 |
1 files changed, 6 insertions, 3 deletions
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; |