Patch "metag/ptrace: Reject partial NT_METAG_RPIPE writes" has been added to the 4.4-stable tree

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

metag/ptrace: Reject partial NT_METAG_RPIPE writes

to the 4.4-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:
metag-ptrace-reject-partial-nt_metag_rpipe-writes.patch
and it can be found in the queue-4.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Dave Martin <[email protected]>
Date: Mon, 27 Mar 2017 15:10:57 +0100
Subject: metag/ptrace: Reject partial NT_METAG_RPIPE writes

From: Dave Martin <[email protected]>

commit 7195ee3120d878259e8d94a5d9f808116f34d5ea upstream.

It's not clear what behaviour is sensible when doing partial write of NT_METAG_RPIPE, so just don't bother.

This patch assumes that userspace will never rely on a partial SETREGSET in this case, since it's not clear what should happen anyway.

---
 arch/metag/kernel/ptrace.c |    2 ++
 1 file changed, 2 insertions(+)

@@ -253,6 +253,8 @@ int metag_rp_state_copyin(struct pt_regs
 	unsigned long long *ptr;
 	int ret, i;
 
+	if (count < 4*13)
+		return -EINVAL;
 	/* Read the entire pipeline before making any changes */
 	ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 				 &rp, 0, 4*13);

Patches currently in stable-queue which might be from [email protected] are

queue-4.4/metag-ptrace-reject-partial-nt_metag_rpipe-writes.patch queue-4.4/metag-ptrace-preserve-previous-registers-for-short-regset-write.patch queue-4.4/metag-ptrace-provide-default-txstatus-for-short-nt_prstatus.patch queue-4.4/c6x-ptrace-remove-useless-ptrace_setregset-implementation.patch queue-4.4/mips-ptrace-preserve-previous-registers-for-short-regset-write.patch queue-4.4/h8300-ptrace-fix-incorrect-register-transfer-count.patch queue-4.4/sparc-ptrace-preserve-previous-registers-for-short-regset-write.patch