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

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

[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-next 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 also be merged in the next major kernel release
during the merge window.

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