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ptp: Validate requests to enable time stamping of external signals.

Browse source 
Commit 415606588c ("PTP: introduce new versions of IOCTLs")
introduced a new external time stamp ioctl that validates the flags.
This patch extends the validation to ensure that at least one rising
or falling edge flag is set when enabling external time stamps.

Signed-off-by: Richard Cochran <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Richard Cochran 2019-11-14 10:44:55 -08:00 • committed by David S. Miller
commit cd734d54e6
2 changed files with 14 additions and 5 deletions
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18
drivers/ptp/ptp_chardev.c
View file

@ -149,11 +149,19 @@ long ptp_ioctl(struct posix_clock *pc, unsigned int cmd, unsigned long arg)
err = -EFAULT;
break;
}
if (((req.extts.flags & ~PTP_EXTTS_VALID_FLAGS) ||
req.extts.rsv[0] || req.extts.rsv[1]) &&
cmd == PTP_EXTTS_REQUEST2) {
err = -EINVAL;
break;
if (cmd == PTP_EXTTS_REQUEST2) {
/* Make sure no reserved bit is set. */
if ((req.extts.flags & ~PTP_EXTTS_VALID_FLAGS) ||
req.extts.rsv[0] || req.extts.rsv[1]) {
err = -EINVAL;
break;
}
/* Ensure one of the rising/falling edge bits is set. */
if ((req.extts.flags & PTP_ENABLE_FEATURE) &&
(req.extts.flags & PTP_EXTTS_EDGES) == 0) {
err = -EINVAL;
break;
}
} else if (cmd == PTP_EXTTS_REQUEST) {
req.extts.flags &= PTP_EXTTS_V1_VALID_FLAGS;
req.extts.rsv[0] = 0;