linux-kernel - [PATCH 1/2] pps: add ioctl_compat function to correct ioctl definitions

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Date:   Fri, 24 Feb 2017 12:23:46 -0800
From:   Matt Ranostay <matt.ranostay@...sulko.com>
To:     linux-kernel@...r.kernel.org
Cc:     Matt Ranostay <matt.ranostay@...sulko.com>,
        Rodolfo Giometti <giometti@...eenne.com>,
        Moritz Fischer <mdf@...nel.org>,
        George McCollister <george.mccollister@...il.com>
Subject: [PATCH 1/2] pps: add ioctl_compat function to correct ioctl definitions

ioctl definitions use the pointer size of the architecture which
is fine when userspace and kernel are the same bitsize. This
patchset workarounds an issue with mixed bitsize kernel + userspace
by rewriting the cmd to the kernelspace architecture pointer size.

Cc: Rodolfo Giometti <giometti@...eenne.com>
Cc: Moritz Fischer <mdf@...nel.org>
Cc: George McCollister <george.mccollister@...il.com>
Signed-off-by: Matt Ranostay <matt.ranostay@...sulko.com>
---
 drivers/pps/pps.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/drivers/pps/pps.c b/drivers/pps/pps.c
index 2f07cd615665..452ead5a5e52 100644
--- a/drivers/pps/pps.c
+++ b/drivers/pps/pps.c
@@ -242,6 +242,18 @@ static long pps_cdev_ioctl(struct file *file,
 	return 0;
 }
 
+#ifdef CONFIG_COMPAT
+static long pps_cdev_compat_ioctl(struct file *file,
+		unsigned int cmd, unsigned long arg)
+{
+	cmd = _IOC(_IOC_DIR(cmd), _IOC_TYPE(cmd), _IOC_NR(cmd), sizeof(void *));
+
+	return pps_cdev_ioctl(file, cmd, arg);
+}
+#else
+#define pps_cdev_compat_ioctl	NULL
+#endif
+
 static int pps_cdev_open(struct inode *inode, struct file *file)
 {
 	struct pps_device *pps = container_of(inode->i_cdev,
@@ -268,6 +280,7 @@ static const struct file_operations pps_cdev_fops = {
 	.llseek		= no_llseek,
 	.poll		= pps_cdev_poll,
 	.fasync		= pps_cdev_fasync,
+	.compat_ioctl	= pps_cdev_compat_ioctl,
 	.unlocked_ioctl	= pps_cdev_ioctl,
 	.open		= pps_cdev_open,
 	.release	= pps_cdev_release,
-- 
2.10.2