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[PATCH] s390: kernel stack corruption

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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>
This commit is contained in:
Peter Oberparleiter
2005-09-16 19:27:42 -07:00
committed by Linus Torvalds
parent 26ff6ad978
commit 6add9f7f52
2 changed files with 2 additions and 2 deletions
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arch/s390/kernel/entry.S
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@@ -108,7 +108,7 @@ STACK_SIZE = 1 << STACK_SHIFT
bl BASED(0f)
l %r14,BASED(.Lcleanup_critical)
basr %r14,%r14
tm 0(%r12),0x01 # retest problem state after cleanup
tm 1(%r12),0x01 # retest problem state after cleanup
bnz BASED(1f)
0: l %r14,__LC_ASYNC_STACK # are we already on the async stack ?
slr %r14,%r15