From 6add9f7f529b124938d14ae9db5a952d1272075a Mon Sep 17 00:00:00 2001 From: Peter Oberparleiter Date: Fri, 16 Sep 2005 19:27:42 -0700 Subject: [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 Signed-off-by: Martin Schwidefsky Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- arch/s390/kernel/entry.S | 2 +- arch/s390/kernel/entry64.S | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-) (limited to 'arch') diff --git a/arch/s390/kernel/entry.S b/arch/s390/kernel/entry.S index 58fc7fbcb40..9b30f4cf32c 100644 --- a/arch/s390/kernel/entry.S +++ b/arch/s390/kernel/entry.S @@ -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 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) clc \psworg+8(8),BASED(.Lcritical_start) jl 0f brasl %r14,cleanup_critical - tm 0(%r12),0x01 # retest problem state after cleanup + tm 1(%r12),0x01 # retest problem state after cleanup jnz 1f 0: lg %r14,__LC_ASYNC_STACK # are we already on the async. stack ? slgr %r14,%r15 -- cgit v1.2.3-70-g09d2