linux-kernel - [PATCH] staging: android: ashmem: Add support for 32bit ashmem calls in a 64bit kernel

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Message-Id: <1362478708-26946-1-git-send-email-serban.constantinescu@arm.com>
Date:	Tue,  5 Mar 2013 10:18:27 +0000
From:	Serban Constantinescu <serban.constantinescu@....com>
To:	gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org,
	kernel-team@...roid.com, arve@...roid.com, john.stultz@...aro.org,
	Dave.Butcher@....com
Cc:	Serban Constantinescu <serban.constantinescu@....com>
Subject: [PATCH] staging: android: ashmem: Add support for 32bit ashmem calls in a 64bit kernel

Android's shared memory subsystem, Ashmem, does not support calls from a
32bit userspace in a 64 bit kernel. This patch adds support for syscalls
coming from a 32bit userspace in a 64bit kernel.

The patch has been successfully tested on ARMv8 AEM(64bit
platform model) and Versatile Express A9(32bit platform).

Signed-off-by: Serban Constantinescu <serban.constantinescu@....com>
---
 drivers/staging/android/ashmem.c |   22 +++++++++++++++++++++-
 drivers/staging/android/ashmem.h |    6 ++++++
 2 files changed, 27 insertions(+), 1 deletion(-)

diff --git a/drivers/staging/android/ashmem.c b/drivers/staging/android/ashmem.c
index 72064fc..e96f381 100644
--- a/drivers/staging/android/ashmem.c
+++ b/drivers/staging/android/ashmem.c
@@ -31,6 +31,7 @@
 #include <linux/bitops.h>
 #include <linux/mutex.h>
 #include <linux/shmem_fs.h>
+#include <linux/compat.h>
 #include "ashmem.h"
 
 #define ASHMEM_NAME_PREFIX "dev/ashmem/"
@@ -674,6 +675,23 @@ static long ashmem_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 	return ret;
 }
 
+/* support of 32bit userspace on 64bit platforms */
+#ifdef CONFIG_COMPAT
+static long compat_ashmem_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
+{
+
+	switch (cmd) {
+	case COMPAT_ASHMEM_SET_SIZE:
+		cmd = ASHMEM_SET_SIZE;
+		break;
+	case COMPAT_ASHMEM_SET_PROT_MASK:
+		cmd = ASHMEM_SET_PROT_MASK;
+		break;
+	}
+	return ashmem_ioctl(file, cmd, arg);
+}
+#endif
+
 static const struct file_operations ashmem_fops = {
 	.owner = THIS_MODULE,
 	.open = ashmem_open,
@@ -682,7 +700,9 @@ static const struct file_operations ashmem_fops = {
 	.llseek = ashmem_llseek,
 	.mmap = ashmem_mmap,
 	.unlocked_ioctl = ashmem_ioctl,
-	.compat_ioctl = ashmem_ioctl,
+#ifdef CONFIG_COMPAT
+	.compat_ioctl = compat_ashmem_ioctl,
+#endif
 };
 
 static struct miscdevice ashmem_misc = {
diff --git a/drivers/staging/android/ashmem.h b/drivers/staging/android/ashmem.h
index 1976b10..2809d31 100644
--- a/drivers/staging/android/ashmem.h
+++ b/drivers/staging/android/ashmem.h
@@ -45,4 +45,10 @@ struct ashmem_pin {
 #define ASHMEM_GET_PIN_STATUS	_IO(__ASHMEMIOC, 9)
 #define ASHMEM_PURGE_ALL_CACHES	_IO(__ASHMEMIOC, 10)
 
+/* support of 32bit userspace on 64bit platforms */
+#ifdef CONFIG_COMPAT
+#define COMPAT_ASHMEM_SET_SIZE		_IOW(__ASHMEMIOC, 3, compat_size_t)
+#define COMPAT_ASHMEM_SET_PROT_MASK	_IOW(__ASHMEMIOC, 5, unsigned int)
+#endif
+
 #endif	/* _LINUX_ASHMEM_H */
-- 
1.7.9.5

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