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authorHeiko Carstens <heiko.carstens@de.ibm.com>2008-02-19 15:29:34 +0100
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2008-02-19 15:29:35 +0100
commitd5b02b3ff1d9a2e1074f559c84ed378cfa6fc3c0 (patch)
tree09cc1de46973bb4a8cd35a2d64d587f1144f38fd /arch/s390/lib
parent39f73b2886be3a255d8f4cd669c8c7e7957afbd9 (diff)
downloadop-kernel-dev-d5b02b3ff1d9a2e1074f559c84ed378cfa6fc3c0.zip
op-kernel-dev-d5b02b3ff1d9a2e1074f559c84ed378cfa6fc3c0.tar.gz
[S390] Fix futex_atomic_cmpxchg_std inline assembly.
Add missing exception table entry so that the kernel can handle proctection exceptions as well on the cs instruction. Currently only specification exceptions are handled correctly. The missing entry allows user space to crash the kernel. Cc: stable <stable@kernel.org> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/lib')
-rw-r--r--arch/s390/lib/uaccess_std.c8
1 files changed, 4 insertions, 4 deletions
diff --git a/arch/s390/lib/uaccess_std.c b/arch/s390/lib/uaccess_std.c
index 28c4500..d2ffbad 100644
--- a/arch/s390/lib/uaccess_std.c
+++ b/arch/s390/lib/uaccess_std.c
@@ -293,10 +293,10 @@ int futex_atomic_cmpxchg_std(int __user *uaddr, int oldval, int newval)
asm volatile(
" sacf 256\n"
- " cs %1,%4,0(%5)\n"
- "0: lr %0,%1\n"
- "1: sacf 0\n"
- EX_TABLE(0b,1b)
+ "0: cs %1,%4,0(%5)\n"
+ "1: lr %0,%1\n"
+ "2: sacf 0\n"
+ EX_TABLE(0b,2b) EX_TABLE(1b,2b)
: "=d" (ret), "+d" (oldval), "=m" (*uaddr)
: "0" (-EFAULT), "d" (newval), "a" (uaddr), "m" (*uaddr)
: "cc", "memory" );
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