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author | Arnd Bergmann <arnd@arndb.de> | 2019-11-08 23:34:30 +0300 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-12-21 12:42:07 +0300 |
commit | 639d248bd90a712822f6f068e7b54128d197d8ea (patch) | |
tree | 9b722570dbc858417a3ca325fd6172d5e7d3b972 /drivers/char | |
parent | 67c05e8e02938552a85fb46b4200fa694801fcff (diff) | |
download | linux-639d248bd90a712822f6f068e7b54128d197d8ea.tar.xz |
ppdev: fix PPGETTIME/PPSETTIME ioctls
commit 998174042da229e2cf5841f574aba4a743e69650 upstream.
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: 3b9ab374a1e6 ("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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/char')
-rw-r--r-- | drivers/char/ppdev.c | 16 |
1 files changed, 12 insertions, 4 deletions
diff --git a/drivers/char/ppdev.c b/drivers/char/ppdev.c index 336d02a488cc..3648727dfe83 100644 --- a/drivers/char/ppdev.c +++ b/drivers/char/ppdev.c @@ -624,20 +624,27 @@ 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; @@ -648,8 +655,9 @@ 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; |