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pps: fix padding issue with PPS_FETCH for ioctl_compat

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Issue is that x86 32-bit aligns to 4-bytes instead of 8-bytes
so this patchset works around the issue and corrects the data
returned in pps_fdata_compat.

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 15:19:45 -08:00 committed by Greg Kroah-Hartman
parent 2ac6665701
commit c2a49fe8ee
2 changed files with 98 additions and 31 deletions
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110
drivers/pps/pps.c
View File

@ -64,6 +64,43 @@ static int pps_cdev_fasync(int fd, struct file *file, int on)
return fasync_helper(fd, file, on, &pps->async_queue);
}
static int pps_cdev_pps_fetch(struct pps_device *pps, struct pps_fdata *fdata)
{
unsigned int ev = pps->last_ev;
int err = 0;
/* Manage the timeout */
if (fdata->timeout.flags & PPS_TIME_INVALID)
err = wait_event_interruptible(pps->queue,
ev != pps->last_ev);
else {
unsigned long ticks;
dev_dbg(pps->dev, "timeout %lld.%09d\n",
(long long) fdata->timeout.sec,
fdata->timeout.nsec);
ticks = fdata->timeout.sec * HZ;
ticks += fdata->timeout.nsec / (NSEC_PER_SEC / HZ);
if (ticks != 0) {
err = wait_event_interruptible_timeout(
pps->queue,
ev != pps->last_ev,
ticks);
if (err == 0)
return -ETIMEDOUT;
}
}
/* Check for pending signals */
if (err == -ERESTARTSYS) {
dev_dbg(pps->dev, "pending signal caught\n");
return -EINTR;
}
return 0;
}
static long pps_cdev_ioctl(struct file *file,
unsigned int cmd, unsigned long arg)
{
@ -144,7 +181,6 @@ static long pps_cdev_ioctl(struct file *file,
case PPS_FETCH: {
struct pps_fdata fdata;
unsigned int ev;
dev_dbg(pps->dev, "PPS_FETCH\n");
@ -152,36 +188,9 @@ static long pps_cdev_ioctl(struct file *file,
if (err)
return -EFAULT;
ev = pps->last_ev;
/* Manage the timeout */
if (fdata.timeout.flags & PPS_TIME_INVALID)
err = wait_event_interruptible(pps->queue,
ev != pps->last_ev);
else {
unsigned long ticks;
dev_dbg(pps->dev, "timeout %lld.%09d\n",
(long long) fdata.timeout.sec,
fdata.timeout.nsec);
ticks = fdata.timeout.sec * HZ;
ticks += fdata.timeout.nsec / (NSEC_PER_SEC / HZ);
if (ticks != 0) {
err = wait_event_interruptible_timeout(
pps->queue,
ev != pps->last_ev,
ticks);
if (err == 0)
return -ETIMEDOUT;
}
}
/* Check for pending signals */
if (err == -ERESTARTSYS) {
dev_dbg(pps->dev, "pending signal caught\n");
return -EINTR;
}
err = pps_cdev_pps_fetch(pps, &fdata);
if (err)
return err;
/* Return the fetched timestamp */
spin_lock_irq(&pps->lock);
@ -246,8 +255,47 @@ static long pps_cdev_ioctl(struct file *file,
static long pps_cdev_compat_ioctl(struct file *file,
unsigned int cmd, unsigned long arg)
{
struct pps_device *pps = file->private_data;
void __user *uarg = (void __user *) arg;
cmd = _IOC(_IOC_DIR(cmd), _IOC_TYPE(cmd), _IOC_NR(cmd), sizeof(void *));
if (cmd == PPS_FETCH) {
struct pps_fdata_compat compat;
struct pps_fdata fdata;
int err;
dev_dbg(pps->dev, "PPS_FETCH\n");
err = copy_from_user(&compat, uarg, sizeof(struct pps_fdata_compat));
if (err)
return -EFAULT;
memcpy(&fdata.timeout, &compat.timeout,
sizeof(struct pps_ktime_compat));
err = pps_cdev_pps_fetch(pps, &fdata);
if (err)
return err;
/* Return the fetched timestamp */
spin_lock_irq(&pps->lock);
compat.info.assert_sequence = pps->assert_sequence;
compat.info.clear_sequence = pps->clear_sequence;
compat.info.current_mode = pps->current_mode;
memcpy(&compat.info.assert_tu, &pps->assert_tu,
sizeof(struct pps_ktime_compat));
memcpy(&compat.info.clear_tu, &pps->clear_tu,
sizeof(struct pps_ktime_compat));
spin_unlock_irq(&pps->lock);
return copy_to_user(uarg, &compat,
sizeof(struct pps_fdata_compat)) ? -EFAULT : 0;
}
return pps_cdev_ioctl(file, cmd, arg);
}
#else

19
include/uapi/linux/pps.h
View File

@ -55,6 +55,12 @@ struct pps_ktime {
__s32 nsec;
__u32 flags;
};
struct pps_ktime_compat {
__s64 sec;
__s32 nsec;
__u32 flags;
} __attribute__((packed, aligned(4)));
#define PPS_TIME_INVALID (1<<0) /* used to specify timeout==NULL */
struct pps_kinfo {
@ -65,6 +71,14 @@ struct pps_kinfo {
int current_mode; /* current mode bits */
};
struct pps_kinfo_compat {
__u32 assert_sequence; /* seq. num. of assert event */
__u32 clear_sequence; /* seq. num. of clear event */
struct pps_ktime_compat assert_tu; /* time of assert event */
struct pps_ktime_compat clear_tu; /* time of clear event */
int current_mode; /* current mode bits */
};
struct pps_kparams {
int api_version; /* API version # */
int mode; /* mode bits */
@ -114,6 +128,11 @@ struct pps_fdata {
struct pps_ktime timeout;
};
struct pps_fdata_compat {
struct pps_kinfo_compat info;
struct pps_ktime_compat timeout;
};
struct pps_bind_args {
int tsformat; /* format of time stamps */
int edge; /* selected event type */