Patch "s390/disassembler: add missing end marker for e7 table" has been added to the 4.9-stable tree

Patch "s390/disassembler: add missing end marker for e7 table" has been added to the 4.9-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    s390/disassembler: add missing end marker for e7 table

to the 4.9-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     s390-disassembler-add-missing-end-marker-for-e7-table.patch
and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>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: s390/disassembler: add missing end marker for e7 table

From: Heiko Carstens <heiko.carstens@de.ibm.com>

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 <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 arch/s390/kernel/dis.c |    1 +
 1 file changed, 1 insertion(+)

--- 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[] = {


Patches currently in stable-queue which might be from heiko.carstens@de.ibm.com are

queue-4.9/s390-disassembler-add-missing-end-marker-for-e7-table.patch
queue-4.9/s390-fix-transactional-execution-control-register-handling.patch
queue-4.9/s390-runtime-instrumention-fix-possible-memory-corruption.patch