diff options
| author | Peter Oberparleiter <peter.oberparleiter@de.ibm.com> | 2005-09-16 22:27:42 -0400 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2005-09-17 14:49:59 -0400 |
| commit | 6add9f7f529b124938d14ae9db5a952d1272075a (patch) | |
| tree | 512f82531228094f6c8696296f36304a4a4e7049 /arch/s390/kernel/entry64.S | |
| parent | 26ff6ad9786abf6f40a6d3cbb89753b4fa50cb00 (diff) | |
[PATCH] s390: kernel stack corruption
When an asynchronous interruption occurs during the execution of the
'critical section' within the generic interruption handling code (entry.S),
a faulty check for a userspace PSW may result in a corrupted kernel stack
pointer which subsequently triggers a stack overflow check.
Signed-off-by: Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch/s390/kernel/entry64.S')
| -rw-r--r-- | arch/s390/kernel/entry64.S | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/s390/kernel/entry64.S b/arch/s390/kernel/entry64.S index d0c9ffaa25d..7b9b4a2ba1d 100644 --- a/arch/s390/kernel/entry64.S +++ b/arch/s390/kernel/entry64.S | |||
| @@ -101,7 +101,7 @@ _TIF_WORK_INT = (_TIF_SIGPENDING | _TIF_NEED_RESCHED | _TIF_MCCK_PENDING) | |||
| 101 | clc \psworg+8(8),BASED(.Lcritical_start) | 101 | clc \psworg+8(8),BASED(.Lcritical_start) |
| 102 | jl 0f | 102 | jl 0f |
| 103 | brasl %r14,cleanup_critical | 103 | brasl %r14,cleanup_critical |
| 104 | tm 0(%r12),0x01 # retest problem state after cleanup | 104 | tm 1(%r12),0x01 # retest problem state after cleanup |
| 105 | jnz 1f | 105 | jnz 1f |
| 106 | 0: lg %r14,__LC_ASYNC_STACK # are we already on the async. stack ? | 106 | 0: lg %r14,__LC_ASYNC_STACK # are we already on the async. stack ? |
| 107 | slgr %r14,%r15 | 107 | slgr %r14,%r15 |