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/entry.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/entry.S')
| -rw-r--r-- | arch/s390/kernel/entry.S | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/s390/kernel/entry.S b/arch/s390/kernel/entry.S index 58fc7fbcb40e..9b30f4cf32c4 100644 --- a/arch/s390/kernel/entry.S +++ b/arch/s390/kernel/entry.S | |||
| @@ -108,7 +108,7 @@ STACK_SIZE = 1 << STACK_SHIFT | |||
| 108 | bl BASED(0f) | 108 | bl BASED(0f) |
| 109 | l %r14,BASED(.Lcleanup_critical) | 109 | l %r14,BASED(.Lcleanup_critical) |
| 110 | basr %r14,%r14 | 110 | basr %r14,%r14 |
| 111 | tm 0(%r12),0x01 # retest problem state after cleanup | 111 | tm 1(%r12),0x01 # retest problem state after cleanup |
| 112 | bnz BASED(1f) | 112 | bnz BASED(1f) |
| 113 | 0: l %r14,__LC_ASYNC_STACK # are we already on the async stack ? | 113 | 0: l %r14,__LC_ASYNC_STACK # are we already on the async stack ? |
| 114 | slr %r14,%r15 | 114 | slr %r14,%r15 |