Patch "arm64/ptrace: Avoid uninitialised struct padding in fpr_set()" has been added to the 4.4-stable tree

Patch "arm64/ptrace: Avoid uninitialised struct padding in fpr_set()" has been added to the 4.4-stable tree

[gregkh]

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

    arm64/ptrace: Avoid uninitialised struct padding in fpr_set()

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:
     arm64-ptrace-avoid-uninitialised-struct-padding-in-fpr_set.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@vger.kernel.org> know about it.


>From aeb1f39d814b2e21e5e5706a48834bfd553d0059 Mon Sep 17 00:00:00 2001
From: Dave Martin <Dave.Martin@arm.com>
Date: Wed, 18 Jan 2017 16:25:23 +0000
Subject: arm64/ptrace: Avoid uninitialised struct padding in fpr_set()

From: Dave Martin <Dave.Martin@arm.com>

commit aeb1f39d814b2e21e5e5706a48834bfd553d0059 upstream.

This patch adds an explicit __reserved[] field to user_fpsimd_state
to replace what was previously unnamed padding.

This ensures that data in this region are propagated across
assignment rather than being left possibly uninitialised at the
destination.

Fixes: 60ffc30d5652 ("arm64: Exception handling")
Signed-off-by: Dave Martin <Dave.Martin@arm.com>
Acked-by: Will Deacon <Will.Deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 arch/arm64/include/uapi/asm/ptrace.h |    1 +
 1 file changed, 1 insertion(+)

--- a/arch/arm64/include/uapi/asm/ptrace.h
+++ b/arch/arm64/include/uapi/asm/ptrace.h
@@ -76,6 +76,7 @@ struct user_fpsimd_state {
 	__uint128_t	vregs[32];
 	__u32		fpsr;
 	__u32		fpcr;
+	__u32		__reserved[2];
 };
 
 struct user_hwdebug_state {


Patches currently in stable-queue which might be from Dave.Martin@arm.com are

queue-4.4/arm64-ptrace-preserve-previous-registers-for-short-regset-write-3.patch
queue-4.4/arm64-ptrace-reject-attempts-to-set-incomplete-hardware-breakpoint-fields.patch
queue-4.4/arm64-ptrace-preserve-previous-registers-for-short-regset-write-2.patch
queue-4.4/arm64-ptrace-avoid-uninitialised-struct-padding-in-fpr_set.patch
queue-4.4/arm64-ptrace-preserve-previous-registers-for-short-regset-write.patch