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ppdev: fix PPGETTIME/PPSETTIME ioctls 

Going through the uses of timeval in the user space API,
I noticed two bugs in ppdev that were introduced in the y2038
conversion:

* The range check was accidentally moved from ppsettime to
  ppgettime

* On sparc64, the microseconds are in the other half of the
  64-bit word.

Fix both, and mark the fix for stable backports.

Cc: stable@vger.kernel.org
Fixes: 3b9ab374a1 ("ppdev: convert to y2038 safe")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Link: https://lore.kernel.org/r/20191108203435.112759-8-arnd@arndb.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Arnd Bergmann 2019-11-08 21:34:30 +01:00 committed by Greg Kroah-Hartman
parent 01b59c763f
commit 998174042d
1 changed files with 12 additions and 4 deletions
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16
drivers/char/ppdev.c
View File

@ -619,20 +619,27 @@ static int pp_do_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
if (copy_from_user(time32, argp, sizeof(time32)))
return -EFAULT;
if ((time32[0] < 0) || (time32[1] < 0))
return -EINVAL;
return pp_set_timeout(pp->pdev, time32[0], time32[1]);
case PPSETTIME64:
if (copy_from_user(time64, argp, sizeof(time64)))
return -EFAULT;
if ((time64[0] < 0) || (time64[1] < 0))
return -EINVAL;
if (IS_ENABLED(CONFIG_SPARC64) && !in_compat_syscall())
time64[1] >>= 32;
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;
if (copy_to_user(argp, time32, sizeof(time32)))
return -EFAULT;
@ -643,8 +650,9 @@ static int pp_do_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
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 (IS_ENABLED(CONFIG_SPARC64) && !in_compat_syscall())
time64[1] <<= 32;
if (copy_to_user(argp, time64, sizeof(time64)))
return -EFAULT;