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media: dvb_frontend: Add commands implementation for compat ioct 

The dtv_properties structure and the dtv_property structure are
different sizes in 32-bit and 64-bit system. This patch provides
FE_SET_PROPERTY and FE_GET_PROPERTY ioctl commands implementation for
32-bit user space applications.

Signed-off-by: Jaedon Shin <jaedon.shin@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
This commit is contained in:
Jaedon Shin 2017-12-01 07:31:30 -05:00 committed by Mauro Carvalho Chehab
parent c2dfd2276c
commit 18192a77f0
1 changed files with 131 additions and 0 deletions
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131
drivers/media/dvb-core/dvb_frontend.c
View File

@ -1979,9 +1979,140 @@ static long dvb_frontend_ioctl(struct file *file, unsigned int cmd,
}
#ifdef CONFIG_COMPAT
struct compat_dtv_property {
__u32 cmd;
__u32 reserved[3];
union {
__u32 data;
struct dtv_fe_stats st;
struct {
__u8 data[32];
__u32 len;
__u32 reserved1[3];
compat_uptr_t reserved2;
} buffer;
} u;
int result;
} __attribute__ ((packed));
struct compat_dtv_properties {
__u32 num;
compat_uptr_t props;
};
#define COMPAT_FE_SET_PROPERTY _IOW('o', 82, struct compat_dtv_properties)
#define COMPAT_FE_GET_PROPERTY _IOR('o', 83, struct compat_dtv_properties)
static int dvb_frontend_handle_compat_ioctl(struct file *file, unsigned int cmd,
unsigned long arg)
{
struct dvb_device *dvbdev = file->private_data;
struct dvb_frontend *fe = dvbdev->priv;
struct dvb_frontend_private *fepriv = fe->frontend_priv;
int i, err = 0;
if (cmd == COMPAT_FE_SET_PROPERTY) {
struct compat_dtv_properties prop, *tvps = NULL;
struct compat_dtv_property *tvp = NULL;
if (copy_from_user(&prop, compat_ptr(arg), sizeof(prop)))
return -EFAULT;
tvps = &prop;
/*
* Put an arbitrary limit on the number of messages that can
* be sent at once
*/
if (!tvps->num || (tvps->num > DTV_IOCTL_MAX_MSGS))
return -EINVAL;
tvp = memdup_user(compat_ptr(tvps->props), tvps->num * sizeof(*tvp));
if (IS_ERR(tvp))
return PTR_ERR(tvp);
for (i = 0; i < tvps->num; i++) {
err = dtv_property_process_set(fe, file,
(tvp + i)->cmd,
(tvp + i)->u.data);
if (err < 0) {
kfree(tvp);
return err;
}
}
kfree(tvp);
} else if (cmd == COMPAT_FE_GET_PROPERTY) {
struct compat_dtv_properties prop, *tvps = NULL;
struct compat_dtv_property *tvp = NULL;
struct dtv_frontend_properties getp = fe->dtv_property_cache;
if (copy_from_user(&prop, compat_ptr(arg), sizeof(prop)))
return -EFAULT;
tvps = &prop;
/*
* Put an arbitrary limit on the number of messages that can
* be sent at once
*/
if (!tvps->num || (tvps->num > DTV_IOCTL_MAX_MSGS))
return -EINVAL;
tvp = memdup_user(compat_ptr(tvps->props), tvps->num * sizeof(*tvp));
if (IS_ERR(tvp))
return PTR_ERR(tvp);
/*
* Let's use our own copy of property cache, in order to
* avoid mangling with DTV zigzag logic, as drivers might
* return crap, if they don't check if the data is available
* before updating the properties cache.
*/
if (fepriv->state != FESTATE_IDLE) {
err = dtv_get_frontend(fe, &getp, NULL);
if (err < 0) {
kfree(tvp);
return err;
}
}
for (i = 0; i < tvps->num; i++) {
err = dtv_property_process_get(
fe, &getp, (struct dtv_property *)tvp + i, file);
if (err < 0) {
kfree(tvp);
return err;
}
}
if (copy_to_user((void __user *)compat_ptr(tvps->props), tvp,
tvps->num * sizeof(struct compat_dtv_property))) {
kfree(tvp);
return -EFAULT;
}
kfree(tvp);
}
return err;
}
static long dvb_frontend_compat_ioctl(struct file *file, unsigned int cmd,
unsigned long arg)
{
struct dvb_device *dvbdev = file->private_data;
struct dvb_frontend *fe = dvbdev->priv;
struct dvb_frontend_private *fepriv = fe->frontend_priv;
int err;
if (cmd == COMPAT_FE_SET_PROPERTY || cmd == COMPAT_FE_GET_PROPERTY) {
if (down_interruptible(&fepriv->sem))
return -ERESTARTSYS;
err = dvb_frontend_handle_compat_ioctl(file, cmd, arg);
up(&fepriv->sem);
return err;
}
return dvb_frontend_ioctl(file, cmd, (unsigned long)compat_ptr(arg));
}
#endif