linux-kernel - [PATCH 12/14] staging: binder: Fix ABI for 64bit Android

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Message-Id: <1392674322-9036-13-git-send-email-john.stultz@linaro.org>
Date:	Mon, 17 Feb 2014 13:58:40 -0800
From:	John Stultz <john.stultz@...aro.org>
To:	LKML <linux-kernel@...r.kernel.org>
Cc:	Serban Constantinescu <serban.constantinescu@....com>,
	Greg KH <gregkh@...uxfoundation.org>,
	Colin Cross <ccross@...roid.com>,
	Arve Hjønnevåg <arve@...roid.com>,
	Android Kernel Team <kernel-team@...roid.com>,
	John Stultz <john.stultz@...aro.org>
Subject: [PATCH 12/14] staging: binder: Fix ABI for 64bit Android

From: Serban Constantinescu <serban.constantinescu@....com>

This patch fixes the ABI for 64bit Android userspace.
BC_REQUEST_DEATH_NOTIFICATION and BC_CLEAR_DEATH_NOTIFICATION claim
to be using struct binder_ptr_cookie, but they are using a 32bit handle
and a pointer.

On 32bit systems the payload size is the same as the size of struct
binder_ptr_cookie, however for 64bit systems this will differ. This
patch adds struct binder_handle_cookie that fixes this issue for 64bit
Android.

Since there are no 64bit users of this interface that we know of this
change should not affect any existing systems.

Cc: Greg KH <gregkh@...uxfoundation.org>
Cc: Colin Cross <ccross@...roid.com>
Cc: Arve Hjønnevåg <arve@...roid.com>
Cc: Serban Constantinescu <serban.constantinescu@....com>
Cc: Android Kernel Team <kernel-team@...roid.com>
Signed-off-by: Serban Constantinescu <serban.constantinescu@....com>
[jstultz: Minor commit tweaks, few 80+ col fixes for checkpatch]
Signed-off-by: John Stultz <john.stultz@...aro.org>
---
 drivers/staging/android/uapi/binder.h | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

diff --git a/drivers/staging/android/uapi/binder.h b/drivers/staging/android/uapi/binder.h
index 2b1eb81..4071fcf 100644
--- a/drivers/staging/android/uapi/binder.h
+++ b/drivers/staging/android/uapi/binder.h
@@ -152,6 +152,11 @@ struct binder_ptr_cookie {
 	void *cookie;
 };
 
+struct binder_handle_cookie {
+	__u32 handle;
+	void *cookie;
+} __attribute__((packed));
+
 struct binder_pri_desc {
 	__s32 priority;
 	__u32 desc;
@@ -308,15 +313,17 @@ enum binder_driver_command_protocol {
 	 * of looping threads it has available.
 	 */
 
-	BC_REQUEST_DEATH_NOTIFICATION = _IOW('c', 14, struct binder_ptr_cookie),
+	BC_REQUEST_DEATH_NOTIFICATION = _IOW('c', 14,
+						struct binder_handle_cookie),
 	/*
-	 * void *: ptr to binder
+	 * int: handle
 	 * void *: cookie
 	 */
 
-	BC_CLEAR_DEATH_NOTIFICATION = _IOW('c', 15, struct binder_ptr_cookie),
+	BC_CLEAR_DEATH_NOTIFICATION = _IOW('c', 15,
+						struct binder_handle_cookie),
 	/*
-	 * void *: ptr to binder
+	 * int: handle
 	 * void *: cookie
 	 */
 
-- 
1.8.3.2

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