* [PATCH 1/2] ppdev: convert to y2038 safe
2015-12-09 6:11 [PATCH 0/2] Convert ppdev to y2038 safe Bamvor Jian Zhang
@ 2015-12-09 6:11 ` Bamvor Jian Zhang
2015-12-09 9:45 ` [Y2038] " Arnd Bergmann
2015-12-09 6:11 ` [PATCH 2/2] ppdev: add support for compat ioctl Bamvor Jian Zhang
1 sibling, 1 reply; 6+ messages in thread
From: Bamvor Jian Zhang @ 2015-12-09 6:11 UTC (permalink / raw)
To: linux-kernel
Cc: y2038, gregkh, arnd, sudipm.mukherjee, broonie, Bamvor Jian Zhang
The y2038 issue for ppdev is changes of timeval in the ioctl
(PPSETTIME and PPGETTIME). The size of struct timeval changes from
8bytes to 16bytes due to the changes of time_t. It lead to the
changes of the command of ioctl, e.g. for PPGETTIME, We have:
on 32-bit (old): 0x80087095
on 32-bit (new): 0x80107095
on 64-bit : 0x80107095
This patch define these two ioctl commands to support the 32bit
and 64bit time_t application at the same time. And, introduce
pp_set_timeout to remove some duplicated code.
Signed-off-by: Bamvor Jian Zhang <bamvor.zhangjian@linaro.org>
---
drivers/char/ppdev.c | 75 ++++++++++++++++++++++++++++++++++++++--------------
1 file changed, 55 insertions(+), 20 deletions(-)
diff --git a/drivers/char/ppdev.c b/drivers/char/ppdev.c
index ae0b42b..19a4d6e 100644
--- a/drivers/char/ppdev.c
+++ b/drivers/char/ppdev.c
@@ -98,6 +98,13 @@ struct pp_struct {
#define ROUND_UP(x,y) (((x)+(y)-1)/(y))
static DEFINE_MUTEX(pp_do_mutex);
+
+/* define fixed sized ioctl cmd for y2038 migration */
+#define PPGETTIME32 _IOR(PP_IOCTL, 0x95, s32[2])
+#define PPSETTIME32 _IOW(PP_IOCTL, 0x96, s32[2])
+#define PPGETTIME64 _IOR(PP_IOCTL, 0x95, s64[2])
+#define PPSETTIME64 _IOW(PP_IOCTL, 0x96, s64[2])
+
static inline void pp_enable_irq (struct pp_struct *pp)
{
struct parport *port = pp->pdev->port;
@@ -322,6 +329,22 @@ static enum ieee1284_phase init_phase (int mode)
return IEEE1284_PH_FWD_IDLE;
}
+static int pp_set_timeout(struct pardevice *pdev, long tv_sec, int tv_usec)
+{
+ long to_jiffies;
+
+ if ((tv_sec < 0) || (tv_usec < 0))
+ return -EINVAL;
+
+ to_jiffies = usecs_to_jiffies(tv_usec);
+ to_jiffies += tv_sec * HZ;
+ if (to_jiffies <= 0)
+ return -EINVAL;
+
+ pdev->timeout = to_jiffies;
+ return 0;
+}
+
static int pp_do_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
unsigned int minor = iminor(file_inode(file));
@@ -495,9 +518,10 @@ static int pp_do_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
unsigned char reg;
unsigned char mask;
int mode;
+ s32 time32[2];
+ s64 time64[2];
+ struct timespec64 ts;
int ret;
- struct timeval par_timeout;
- long to_jiffies;
case PPRSTATUS:
reg = parport_read_status (port);
@@ -592,29 +616,40 @@ static int pp_do_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
atomic_sub (ret, &pp->irqc);
return 0;
- case PPSETTIME:
- if (copy_from_user (&par_timeout, argp, sizeof(struct timeval))) {
+ case PPSETTIME32:
+ if (copy_from_user(time32, argp, sizeof(time32)))
return -EFAULT;
- }
- /* Convert to jiffies, place in pp->pdev->timeout */
- if ((par_timeout.tv_sec < 0) || (par_timeout.tv_usec < 0)) {
- return -EINVAL;
- }
- to_jiffies = ROUND_UP(par_timeout.tv_usec, 1000000/HZ);
- to_jiffies += par_timeout.tv_sec * (long)HZ;
- if (to_jiffies <= 0) {
+
+ return pp_set_timeout(pp->pdev, time32[0], time32[1]);
+
+ case PPSETTIME64:
+ if (copy_from_user(time64, argp, sizeof(time64)))
+ return -EFAULT;
+
+ return pp_set_timeout(pp->pdev, time64[0], time64[1]);
+
+ case PPGETTIME32:
+ jiffies_to_timespec64(pp->pdev->timeout, &ts);
+ time32[0] = ts.tv_sec;
+ time32[1] = ts.tv_nsec / NSEC_PER_USEC;
+ if ((time32[0] < 0) || (time32[1] < 0))
return -EINVAL;
- }
- pp->pdev->timeout = to_jiffies;
+
+ if (copy_to_user(time32, argp, sizeof(time32)))
+ return -EFAULT;
+
return 0;
- case PPGETTIME:
- to_jiffies = pp->pdev->timeout;
- memset(&par_timeout, 0, sizeof(par_timeout));
- par_timeout.tv_sec = to_jiffies / HZ;
- par_timeout.tv_usec = (to_jiffies % (long)HZ) * (1000000/HZ);
- if (copy_to_user (argp, &par_timeout, sizeof(struct timeval)))
+ case PPGETTIME64:
+ jiffies_to_timespec64(pp->pdev->timeout, &ts);
+ time64[0] = ts.tv_sec;
+ time64[1] = ts.tv_nsec / NSEC_PER_USEC;
+ if ((time64[0] < 0) || (time64[1] < 0))
+ return -EINVAL;
+
+ if (copy_to_user(time64, argp, sizeof(time64)))
return -EFAULT;
+
return 0;
default:
--
2.1.4
^ permalink raw reply related [flat|nested] 6+ messages in thread* [PATCH 2/2] ppdev: add support for compat ioctl
2015-12-09 6:11 [PATCH 0/2] Convert ppdev to y2038 safe Bamvor Jian Zhang
2015-12-09 6:11 ` [PATCH 1/2] ppdev: convert " Bamvor Jian Zhang
@ 2015-12-09 6:11 ` Bamvor Jian Zhang
2015-12-09 6:39 ` kbuild test robot
1 sibling, 1 reply; 6+ messages in thread
From: Bamvor Jian Zhang @ 2015-12-09 6:11 UTC (permalink / raw)
To: linux-kernel
Cc: y2038, gregkh, arnd, sudipm.mukherjee, broonie, Bamvor Jian Zhang
The arg of ioctl in ppdev is the pointer of integer except the
timeval in PPSETTIME, PPGETTIME. Different size of timeval
is already supported by the previous patches. So, it is safe
to add compat support.
Signed-off-by: Bamvor Jian Zhang <bamvor.zhangjian@linaro.org>
---
drivers/char/ppdev.c | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/drivers/char/ppdev.c b/drivers/char/ppdev.c
index 19a4d6e..7390166 100644
--- a/drivers/char/ppdev.c
+++ b/drivers/char/ppdev.c
@@ -670,6 +670,14 @@ static long pp_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
return ret;
}
+#ifdef CONFIG_COMPAT
+static long pp_compat_ioctl(struct file *file, unsigned int cmd,
+ unsigned long arg)
+{
+ return pp_ioctl(file, cmd, (unsigned long)compat_ptr(arg));
+}
+#endif
+
static int pp_open (struct inode * inode, struct file * file)
{
unsigned int minor = iminor(inode);
@@ -779,6 +787,9 @@ static const struct file_operations pp_fops = {
.write = pp_write,
.poll = pp_poll,
.unlocked_ioctl = pp_ioctl,
+#ifdef CONFIG_COMPAT
+ .compat_ioctl = pp_compat_ioctl,
+#endif
.open = pp_open,
.release = pp_release,
};
--
2.1.4
^ permalink raw reply related [flat|nested] 6+ messages in thread