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

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 <[email protected]> know about it.

From: Heiko Carstens <[email protected]>
Date: Tue, 26 Sep 2017 09:16:48 +0200
Subject: s390/disassembler: add missing end marker for e7 table

From: Heiko Carstens <[email protected]>

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.

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

@@ -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 [email protected] 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