commit 365b073075ef23cfdd8ba68720e7de3b4dbe4f1b
Author: Heiko Carstens <[EMAIL PROTECTED]>
Date: Tue Feb 19 17:20:11 2008 +0000
S390: Fix futex_atomic_cmpxchg_std inline assembly.
commit: d5b02b3ff1d9a2e1074f559c84ed378cfa6fc3c0 upstream
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.
Signed-off-by: Heiko Carstens <[EMAIL PROTECTED]>
Signed-off-by: Martin Schwidefsky <[EMAIL PROTECTED]>
Signed-off-by: Greg Kroah-Hartman <[EMAIL PROTECTED]>
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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