[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>
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1 changed files with 4 additions and 4 deletions
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@ -293,10 +293,10 @@ int futex_atomic_cmpxchg_std(int __user *uaddr, int oldval, int newval)
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asm volatile(
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" sacf 256\n"
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" cs %1,%4,0(%5)\n"
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"0: lr %0,%1\n"
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"1: sacf 0\n"
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EX_TABLE(0b,1b)
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"0: cs %1,%4,0(%5)\n"
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"1: lr %0,%1\n"
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"2: sacf 0\n"
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EX_TABLE(0b,2b) EX_TABLE(1b,2b)
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: "=d" (ret), "+d" (oldval), "=m" (*uaddr)
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: "0" (-EFAULT), "d" (newval), "a" (uaddr), "m" (*uaddr)
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: "cc", "memory" );
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