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 <stable@xxxxxxxxxxxxxxx> know about it.
>From 7195ee3120d878259e8d94a5d9f808116f34d5ea Mon Sep 17 00:00:00 2001
From: Dave Martin <Dave.Martin@xxxxxxx>
Date: Mon, 27 Mar 2017 15:10:57 +0100
Subject: metag/ptrace: Reject partial NT_METAG_RPIPE writes
From: Dave Martin <Dave.Martin@xxxxxxx>
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.
Signed-off-by: Dave Martin <Dave.Martin@xxxxxxx>
Acked-by: James Hogan <james.hogan@xxxxxxxxxx>
Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/metag/kernel/ptrace.c | 2 ++
1 file changed, 2 insertions(+)
--- a/arch/metag/kernel/ptrace.c
+++ b/arch/metag/kernel/ptrace.c
@@ -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 Dave.Martin@xxxxxxx 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