diff options
Diffstat (limited to 'kernel/time')
| -rw-r--r-- | kernel/time/ntp.c | 39 |
1 files changed, 27 insertions, 12 deletions
diff --git a/kernel/time/ntp.c b/kernel/time/ntp.c index 59e2749be0fa..457d2ba245fe 100644 --- a/kernel/time/ntp.c +++ b/kernel/time/ntp.c @@ -622,17 +622,13 @@ static inline void process_adjtimex_modes(struct timex *txc, ntp_update_frequency(); } -/* - * adjtimex mainly allows reading (and writing, if superuser) of - * kernel time-keeping variables. used by xntpd. + + +/** + * ntp_validate_timex - Ensures the timex is ok for use in do_adjtimex */ -int do_adjtimex(struct timex *txc) +int ntp_validate_timex(struct timex *txc) { - struct timespec ts; - u32 time_tai, orig_tai; - int result; - - /* Validate the data before disabling interrupts */ if (txc->modes & ADJ_ADJTIME) { /* singleshot must not be used with any other mode bits */ if (!(txc->modes & ADJ_OFFSET_SINGLESHOT)) @@ -644,7 +640,6 @@ int do_adjtimex(struct timex *txc) /* In order to modify anything, you gotta be super-user! */ if (txc->modes && !capable(CAP_SYS_TIME)) return -EPERM; - /* * if the quartz is off by more than 10% then * something is VERY wrong! @@ -655,12 +650,32 @@ int do_adjtimex(struct timex *txc) return -EINVAL; } + if ((txc->modes & ADJ_SETOFFSET) && (!capable(CAP_SYS_TIME))) + return -EPERM; + + return 0; +} + + +/* + * adjtimex mainly allows reading (and writing, if superuser) of + * kernel time-keeping variables. used by xntpd. + */ +int do_adjtimex(struct timex *txc) +{ + struct timespec ts; + u32 time_tai, orig_tai; + int result; + + /* Validate the data before disabling interrupts */ + result = ntp_validate_timex(txc); + if (result) + return result; + if (txc->modes & ADJ_SETOFFSET) { struct timespec delta; delta.tv_sec = txc->time.tv_sec; delta.tv_nsec = txc->time.tv_usec; - if (!capable(CAP_SYS_TIME)) - return -EPERM; if (!(txc->modes & ADJ_NANO)) delta.tv_nsec *= 1000; result = timekeeping_inject_offset(&delta); |