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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.

Acked-by: Rodolfo Giometti <giometti@enneenne.com>
Signed-off-by: Matt Ranostay <matt.ranostay@konsulko.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Matt Ranostay 2017-03-10 15:19:44 -08:00 committed by Greg Kroah-Hartman
parent 48a5e6bdc2
commit 2ac6665701
1 changed files with 13 additions and 0 deletions
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13
drivers/pps/pps.c
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@ -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,