The patch below does not apply to the 3.18-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From 5c50538752af7968f53924b22dede8ed4ce4cb3b Mon Sep 17 00:00:00 2001
From: Heiko Carstens heiko.carstens@de.ibm.com Date: Tue, 26 Sep 2017 09:16:48 +0200 Subject: [PATCH] s390/disassembler: add missing end marker for e7 table
The e7 opcode table does not have an end marker. Hence when trying to find an unknown e7 instruction the code will access memory behind the table until it finds something that matches the opcode, or the kernel crashes, whatever comes first.
This affects not only the in-kernel disassembler but also uprobes and kprobes which refuse to set a probe on unknown instructions, and therefore search the opcode tables to figure out if instructions are known or not.
Cc: stable@vger.kernel.org # v3.18+ Fixes: 3585cb0280654 ("s390/disassembler: add vector instructions") Signed-off-by: Heiko Carstens heiko.carstens@de.ibm.com Signed-off-by: Martin Schwidefsky schwidefsky@de.ibm.com
diff --git a/arch/s390/kernel/dis.c b/arch/s390/kernel/dis.c index f7e82302a71e..d9970c15f79d 100644 --- a/arch/s390/kernel/dis.c +++ b/arch/s390/kernel/dis.c @@ -1548,6 +1548,7 @@ static struct s390_insn opcode_e7[] = { { "vfsq", 0xce, INSTR_VRR_VV000MM }, { "vfs", 0xe2, INSTR_VRR_VVV00MM }, { "vftci", 0x4a, INSTR_VRI_VVIMM }, + { "", 0, INSTR_INVALID } };
static struct s390_insn opcode_eb[] = {