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[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>
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2 changed files with 2 additions and 2 deletions
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@ -108,7 +108,7 @@ STACK_SIZE = 1 << STACK_SHIFT
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bl BASED(0f)
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l %r14,BASED(.Lcleanup_critical)
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basr %r14,%r14
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tm 0(%r12),0x01 # retest problem state after cleanup
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tm 1(%r12),0x01 # retest problem state after cleanup
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bnz BASED(1f)
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0: l %r14,__LC_ASYNC_STACK # are we already on the async stack ?
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slr %r14,%r15
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@ -101,7 +101,7 @@ _TIF_WORK_INT = (_TIF_SIGPENDING | _TIF_NEED_RESCHED | _TIF_MCCK_PENDING)
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clc \psworg+8(8),BASED(.Lcritical_start)
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jl 0f
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brasl %r14,cleanup_critical
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tm 0(%r12),0x01 # retest problem state after cleanup
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tm 1(%r12),0x01 # retest problem state after cleanup
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jnz 1f
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0: lg %r14,__LC_ASYNC_STACK # are we already on the async. stack ?
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slgr %r14,%r15
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