patch "ANDROID: binder: add padding to binder_fd_array_object." added to char-misc-testing

patch "ANDROID: binder: add padding to binder_fd_array_object." added to char-misc-testing

[gregkh]

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

    ANDROID: binder: add padding to binder_fd_array_object.

to my char-misc git tree which can be found at
    git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc.git
in the char-misc-testing branch.

The patch will show up in the next release of the linux-next tree
(usually sometime within the next 24 hours during the week.)

The patch will be merged to the char-misc-next branch sometime soon,
after it passes testing, and the merge window is open.

If you have any questions about this process, please let me know.


>From 5cdcf4c6a638591ec0e98c57404a19e7f9997567 Mon Sep 17 00:00:00 2001
From: Martijn Coenen <maco@android.com>
Date: Fri, 28 Jul 2017 13:56:06 +0200
Subject: ANDROID: binder: add padding to binder_fd_array_object.

binder_fd_array_object starts with a 4-byte header,
followed by a few fields that are 8 bytes when
ANDROID_BINDER_IPC_32BIT=N.

This can cause alignment issues in a 64-bit kernel
with a 32-bit userspace, as on x86_32 an 8-byte primitive
may be aligned to a 4-byte address. Pad with a __u32
to fix this.

Signed-off-by: Martijn Coenen <maco@android.com>
Cc: stable <stable@vger.kernel.org> # 4.11+
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 include/uapi/linux/android/binder.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/include/uapi/linux/android/binder.h b/include/uapi/linux/android/binder.h
index 51f891fb1b18..7668b5791c91 100644
--- a/include/uapi/linux/android/binder.h
+++ b/include/uapi/linux/android/binder.h
@@ -132,6 +132,7 @@ enum {
 
 /* struct binder_fd_array_object - object describing an array of fds in a buffer
  * @hdr:		common header structure
+ * @pad:		padding to ensure correct alignment
  * @num_fds:		number of file descriptors in the buffer
  * @parent:		index in offset array to buffer holding the fd array
  * @parent_offset:	start offset of fd array in the buffer
@@ -152,6 +153,7 @@ enum {
  */
 struct binder_fd_array_object {
 	struct binder_object_header	hdr;
+	__u32				pad;
 	binder_size_t			num_fds;
 	binder_size_t			parent;
 	binder_size_t			parent_offset;
-- 
2.14.1