From 538099608673c08643801d2f783b4fb57a924017 Mon Sep 17 00:00:00 2001 From: Heiko Carstens Date: Tue, 26 Sep 2017 09:16:48 +0200 Subject: [PATCH] s390/disassembler: add missing end marker for e7 table commit 5c50538752af7968f53924b22dede8ed4ce4cb3b upstream. 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. Fixes: 3585cb0280654 ("s390/disassembler: add vector instructions") Signed-off-by: Heiko Carstens Signed-off-by: Martin Schwidefsky Signed-off-by: Greg Kroah-Hartman --- arch/s390/kernel/dis.c | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/s390/kernel/dis.c b/arch/s390/kernel/dis.c index c74c59236f44..de925c575cfe 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[] = { -- 2.30.2