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| author | Carsten Otte <cotte@de.ibm.com> | 2009-03-26 14:23:57 (GMT) |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2009-03-26 14:24:09 (GMT) |
| commit | 702d9e584feb028ed7e2a6d2b103b8ea57622ff2 (patch) | |
| tree | 965f82b6d0d82e8492a97ac5a117ba47c26d1674 /arch/s390 | |
| parent | 3324e60aafa9aeb1009878d45079b67367a5e2b6 (diff) | |
| download | linux-702d9e584feb028ed7e2a6d2b103b8ea57622ff2.tar.xz | |
[S390] check addressing mode in s390_enable_sie
The sie instruction requires address spaces to be switched
to run proper. This patch verifies that this is the case
in s390_enable_sie, otherwise the kernel would crash badly
as soon as the process runs into sie.
Signed-off-by: Carsten Otte <cotte@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390')
| -rw-r--r-- | arch/s390/mm/pgtable.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/s390/mm/pgtable.c b/arch/s390/mm/pgtable.c index 6b6ddc4..9bf8612 100644 --- a/arch/s390/mm/pgtable.c +++ b/arch/s390/mm/pgtable.c @@ -258,6 +258,10 @@ int s390_enable_sie(void) struct task_struct *tsk = current; struct mm_struct *mm, *old_mm; + /* Do we have switched amode? If no, we cannot do sie */ + if (!switch_amode) + return -EINVAL; + /* Do we have pgstes? if yes, we are done */ if (tsk->mm->context.has_pgste) return 0; |