xnu-4903.221.2.tar.gz

[apple/xnu.git] / bsd / kern / kern_time.c

diff --git a/bsd/kern/kern_time.c b/bsd/kern/kern_time.c
index 6f392fb86c6ad48cc8c0a12cc02fad672709e5c2..ba2e6c9901c9e3cc42d81c5792593da62c55b693 100644 (file)
--- a/bsd/kern/kern_time.c
+++ b/bsd/kern/kern_time.c
@@ -75,10 +75,12 @@
 #include <sys/kauth.h>
 #include <sys/vnode.h>
 #include <sys/time.h>
 #include <sys/kauth.h>
 #include <sys/vnode.h>
 #include <sys/time.h>

+#include <sys/priv.h>

 
 #include <sys/mount_internal.h>
 #include <sys/sysproto.h>
 #include <sys/signalvar.h>
 
 #include <sys/mount_internal.h>
 #include <sys/sysproto.h>
 #include <sys/signalvar.h>

+#include <sys/protosw.h> /* for net_uptime2timeval() */

 
 #include <kern/clock.h>
 #include <kern/task.h>
 
 #include <kern/clock.h>
 #include <kern/task.h>


@@ -86,6 +88,8 @@
 #if CONFIG_MACF
 #include <security/mac_framework.h>
 #endif
 #if CONFIG_MACF
 #include <security/mac_framework.h>
 #endif

+#include <IOKit/IOBSD.h>
+#include <sys/time.h>

 
 #define HZ     100     /* XXX */
 
 
 #define HZ     100     /* XXX */
 


@@ -98,9 +102,10 @@ lck_grp_attr_t      *tz_slock_grp_attr;
 static void            setthetime(
                                        struct timeval  *tv);
 
 static void            setthetime(
                                        struct timeval  *tv);
 

-void time_zone_slock_init(void) __attribute__((section("__TEXT, initcode")));
+void time_zone_slock_init(void);
+static boolean_t timeval_fixusec(struct timeval *t1);

 
 

-/* 
+/*

  * Time of day and interval timer support.
  *
  * These routines provide the kernel entry points to get and set
  * Time of day and interval timer support.
  *
  * These routines provide the kernel entry points to get and set


@@ -112,31 +117,51 @@ void time_zone_slock_init(void) __attribute__((section("__TEXT, initcode")));
 /* ARGSUSED */
 int
 gettimeofday(
 /* ARGSUSED */
 int
 gettimeofday(

-__unused       struct proc     *p,
-                       struct gettimeofday_args *uap, 
-                       int32_t *retval)
+                       struct proc     *p,
+                       struct gettimeofday_args *uap,
+                       __unused int32_t *retval)

 {
        int error = 0;
        struct timezone ltz; /* local copy */
 {
        int error = 0;
        struct timezone ltz; /* local copy */

+       clock_sec_t secs;
+       clock_usec_t usecs;
+       uint64_t mach_time;

 
 

-       if (uap->tp) {
-               clock_sec_t             secs;
-               clock_usec_t    usecs;
+       if (uap->tp || uap->mach_absolute_time) {
+               clock_gettimeofday_and_absolute_time(&secs, &usecs, &mach_time);
+       }

 
 

-               clock_gettimeofday(&secs, &usecs);
-               retval[0] = secs;
-               retval[1] = usecs;
+       if (uap->tp) {
+               /* Casting secs through a uint32_t to match arm64 commpage */
+               if (IS_64BIT_PROCESS(p)) {
+                       struct user64_timeval user_atv = {};
+                       user_atv.tv_sec = (uint32_t)secs;
+                       user_atv.tv_usec = usecs;
+                       error = copyout(&user_atv, uap->tp, sizeof(user_atv));
+               } else {
+                       struct user32_timeval user_atv = {};
+                       user_atv.tv_sec = (uint32_t)secs;
+                       user_atv.tv_usec = usecs;
+                       error = copyout(&user_atv, uap->tp, sizeof(user_atv));
+               }
+               if (error) {
+                       return error;
+               }

        }
        }

-       
+

        if (uap->tzp) {
                lck_spin_lock(tz_slock);
                ltz = tz;
                lck_spin_unlock(tz_slock);
 
        if (uap->tzp) {
                lck_spin_lock(tz_slock);
                ltz = tz;
                lck_spin_unlock(tz_slock);
 

-               error = copyout((caddr_t)&ltz, CAST_USER_ADDR_T(uap->tzp), sizeof (tz));
+               error = copyout((caddr_t)&ltz, CAST_USER_ADDR_T(uap->tzp), sizeof(tz));

        }
 
        }
 

-       return (error);
+       if (error == 0 && uap->mach_absolute_time) {
+               error = copyout(&mach_time, uap->mach_absolute_time, sizeof(mach_time));
+       }
+
+       return error;

 }
 
 /*
 }
 
 /*


@@ -152,15 +177,20 @@ settimeofday(__unused struct proc *p, struct settimeofday_args  *uap, __unused i
 
        bzero(&atv, sizeof(atv));
 
 
        bzero(&atv, sizeof(atv));
 

+       /* Check that this task is entitled to set the time or it is root */
+       if (!IOTaskHasEntitlement(current_task(), SETTIME_ENTITLEMENT)) {
+

 #if CONFIG_MACF
 #if CONFIG_MACF

-       error = mac_system_check_settime(kauth_cred_get());
-       if (error)
-               return (error);
+               error = mac_system_check_settime(kauth_cred_get());
+               if (error)
+                       return (error);

 #endif
 #ifndef CONFIG_EMBEDDED
 #endif
 #ifndef CONFIG_EMBEDDED

-       if ((error = suser(kauth_cred_get(), &p->p_acflag)))
-               return (error);
+               if ((error = suser(kauth_cred_get(), &p->p_acflag)))
+                       return (error);

 #endif
 #endif

+       }
+

        /* Verify all parameters before changing time */
        if (uap->tv) {
                if (IS_64BIT_PROCESS(p)) {
        /* Verify all parameters before changing time */
        if (uap->tv) {
                if (IS_64BIT_PROCESS(p)) {


@@ -180,8 +210,10 @@ settimeofday(__unused struct proc *p, struct settimeofday_args  *uap, __unused i
        if (uap->tzp && (error = copyin(uap->tzp, (caddr_t)&atz, sizeof(atz))))
                return (error);
        if (uap->tv) {
        if (uap->tzp && (error = copyin(uap->tzp, (caddr_t)&atz, sizeof(atz))))
                return (error);
        if (uap->tv) {

-               timevalfix(&atv);
-               if (atv.tv_sec < 0 || (atv.tv_sec == 0 && atv.tv_usec < 0))
+               /* only positive values of sec/usec are accepted */
+               if (atv.tv_sec < 0 || atv.tv_usec < 0)
+                       return (EPERM);
+               if (!timeval_fixusec(&atv))

                        return (EPERM);
                setthetime(&atv);
        }
                        return (EPERM);
                setthetime(&atv);
        }


@@ -200,59 +232,6 @@ setthetime(
        clock_set_calendar_microtime(tv->tv_sec, tv->tv_usec);
 }
 
        clock_set_calendar_microtime(tv->tv_sec, tv->tv_usec);
 }
 

-/*
- * XXX Y2038 bug because of clock_adjtime() first argument
- */
-/* ARGSUSED */
-int
-adjtime(struct proc *p, struct adjtime_args *uap, __unused int32_t *retval)
-{
-       struct timeval atv;
-       int error;
-
-#if CONFIG_MACF
-       error = mac_system_check_settime(kauth_cred_get());
-       if (error)
-               return (error);
-#endif
-       if ((error = suser(kauth_cred_get(), &p->p_acflag)))
-               return (error);
-       if (IS_64BIT_PROCESS(p)) {
-               struct user64_timeval user_atv;
-               error = copyin(uap->delta, &user_atv, sizeof(user_atv));
-               atv.tv_sec = user_atv.tv_sec;
-               atv.tv_usec = user_atv.tv_usec;
-       } else {
-               struct user32_timeval user_atv;
-               error = copyin(uap->delta, &user_atv, sizeof(user_atv));
-               atv.tv_sec = user_atv.tv_sec;
-               atv.tv_usec = user_atv.tv_usec;
-       }
-       if (error)
-               return (error);
-               
-       /*
-        * Compute the total correction and the rate at which to apply it.
-        */
-       clock_adjtime(&atv.tv_sec, &atv.tv_usec);
-
-       if (uap->olddelta) {
-               if (IS_64BIT_PROCESS(p)) {
-                       struct user64_timeval user_atv;
-                       user_atv.tv_sec = atv.tv_sec;
-                       user_atv.tv_usec = atv.tv_usec;
-                       error = copyout(&user_atv, uap->olddelta, sizeof(user_atv));
-               } else {
-                       struct user32_timeval user_atv;
-                       user_atv.tv_sec = atv.tv_sec;
-                       user_atv.tv_usec = atv.tv_usec;
-                       error = copyout(&user_atv, uap->olddelta, sizeof(user_atv));
-               }
-       }
-
-       return (0);
-}
-

 /*
  *     Verify the calendar value.  If negative,
  *     reset to zero (the epoch).
 /*
  *     Verify the calendar value.  If negative,
  *     reset to zero (the epoch).


@@ -292,6 +271,18 @@ boottime_sec(void)
        return (secs);
 }
 
        return (secs);
 }
 

+void
+boottime_timeval(struct timeval *tv)
+{
+       clock_sec_t             secs;
+       clock_usec_t    microsecs;
+
+       clock_get_boottime_microtime(&secs, &microsecs);
+
+       tv->tv_sec = secs;
+       tv->tv_usec = microsecs;
+}
+

 /*
  * Get value of an interval timer.  The process virtual and
  * profiling virtual time timers are kept internally in the
 /*
  * Get value of an interval timer.  The process virtual and
  * profiling virtual time timers are kept internally in the


@@ -363,6 +354,7 @@ getitimer(struct proc *p, struct getitimer_args *uap, __unused int32_t *retval)
 
        if (IS_64BIT_PROCESS(p)) {
                struct user64_itimerval user_itv;
 
        if (IS_64BIT_PROCESS(p)) {
                struct user64_itimerval user_itv;

+               bzero(&user_itv, sizeof (user_itv));

                user_itv.it_interval.tv_sec = aitv.it_interval.tv_sec;
                user_itv.it_interval.tv_usec = aitv.it_interval.tv_usec;
                user_itv.it_value.tv_sec = aitv.it_value.tv_sec;
                user_itv.it_interval.tv_sec = aitv.it_interval.tv_sec;
                user_itv.it_interval.tv_usec = aitv.it_interval.tv_usec;
                user_itv.it_value.tv_sec = aitv.it_value.tv_sec;


@@ -370,6 +362,7 @@ getitimer(struct proc *p, struct getitimer_args *uap, __unused int32_t *retval)
                return (copyout((caddr_t)&user_itv, uap->itv, sizeof (user_itv)));
        } else {
                struct user32_itimerval user_itv;
                return (copyout((caddr_t)&user_itv, uap->itv, sizeof (user_itv)));
        } else {
                struct user32_itimerval user_itv;

+               bzero(&user_itv, sizeof (user_itv));            

                user_itv.it_interval.tv_sec = aitv.it_interval.tv_sec;
                user_itv.it_interval.tv_usec = aitv.it_interval.tv_usec;
                user_itv.it_value.tv_sec = aitv.it_value.tv_sec;
                user_itv.it_interval.tv_sec = aitv.it_interval.tv_sec;
                user_itv.it_interval.tv_usec = aitv.it_interval.tv_usec;
                user_itv.it_value.tv_sec = aitv.it_value.tv_sec;


@@ -431,7 +424,8 @@ setitimer(struct proc *p, struct setitimer_args *uap, int32_t *retval)
                        microuptime(&p->p_rtime);
                        timevaladd(&p->p_rtime, &aitv.it_value);
                        p->p_realtimer = aitv;
                        microuptime(&p->p_rtime);
                        timevaladd(&p->p_rtime, &aitv.it_value);
                        p->p_realtimer = aitv;

-                       if (!thread_call_enter_delayed(p->p_rcall, tvtoabstime(&p->p_rtime)))
+                       if (!thread_call_enter_delayed_with_leeway(p->p_rcall, NULL,
+                                                tvtoabstime(&p->p_rtime), 0, THREAD_CALL_DELAY_USER_NORMAL))

                                p->p_ractive++;
                } else  {
                        timerclear(&p->p_rtime);
                                p->p_ractive++;
                } else  {
                        timerclear(&p->p_rtime);


@@ -480,24 +474,34 @@ setitimer(struct proc *p, struct setitimer_args *uap, int32_t *retval)
  */
 void
 realitexpire(
  */
 void
 realitexpire(

-       struct proc     *p)
+       struct proc *p)

 {
        struct proc *r;
 {
        struct proc *r;

-       struct timeval  t;
+       struct timeval t;

 
        r = proc_find(p->p_pid);
 
        proc_spinlock(p);
 
 
        r = proc_find(p->p_pid);
 
        proc_spinlock(p);
 

+       assert(p->p_ractive > 0);
+

        if (--p->p_ractive > 0 || r != p) {
        if (--p->p_ractive > 0 || r != p) {

+               /*
+                * bail, because either proc is exiting
+                * or there's another active thread call
+                */

                proc_spinunlock(p);
 
                if (r != NULL)
                        proc_rele(r);
                return;
        }
                proc_spinunlock(p);
 
                if (r != NULL)
                        proc_rele(r);
                return;
        }

-       
+

        if (!timerisset(&p->p_realtimer.it_interval)) {
        if (!timerisset(&p->p_realtimer.it_interval)) {

+               /*
+                * p_realtimer was cleared while this call was pending,
+                * send one last SIGALRM, but don't re-arm
+                */

                timerclear(&p->p_rtime);
                proc_spinunlock(p);
 
                timerclear(&p->p_rtime);
                proc_spinunlock(p);
 


@@ -506,8 +510,29 @@ realitexpire(
                return;
        }
 
                return;
        }
 

+       proc_spinunlock(p);
+
+       /*
+        * Send the signal before re-arming the next thread call,
+        * so in case psignal blocks, we won't create yet another thread call.
+        */
+
+       psignal(p, SIGALRM);
+
+       proc_spinlock(p);
+
+       /* Should we still re-arm the next thread call? */
+       if (!timerisset(&p->p_realtimer.it_interval)) {
+               timerclear(&p->p_rtime);
+               proc_spinunlock(p);
+
+               proc_rele(p);
+               return;
+       }
+

        microuptime(&t);
        timevaladd(&p->p_rtime, &p->p_realtimer.it_interval);
        microuptime(&t);
        timevaladd(&p->p_rtime, &p->p_realtimer.it_interval);

+

        if (timercmp(&p->p_rtime, &t, <=)) {
                if ((p->p_rtime.tv_sec + 2) >= t.tv_sec) {
                        for (;;) {
        if (timercmp(&p->p_rtime, &t, <=)) {
                if ((p->p_rtime.tv_sec + 2) >= t.tv_sec) {
                        for (;;) {


@@ -515,21 +540,62 @@ realitexpire(
                                if (timercmp(&p->p_rtime, &t, >))
                                        break;
                        }
                                if (timercmp(&p->p_rtime, &t, >))
                                        break;
                        }

-               }
-               else {
+               } else {

                        p->p_rtime = p->p_realtimer.it_interval;
                        timevaladd(&p->p_rtime, &t);
                }
        }
 
                        p->p_rtime = p->p_realtimer.it_interval;
                        timevaladd(&p->p_rtime, &t);
                }
        }
 

-       if (!thread_call_enter_delayed(p->p_rcall, tvtoabstime(&p->p_rtime)))
+       assert(p->p_rcall != NULL);
+
+       if (!thread_call_enter_delayed_with_leeway(p->p_rcall, NULL, tvtoabstime(&p->p_rtime), 0,
+                                                  THREAD_CALL_DELAY_USER_NORMAL)) {

                p->p_ractive++;
                p->p_ractive++;

+       }
+

        proc_spinunlock(p);
 
        proc_spinunlock(p);
 

-       psignal(p, SIGALRM);

        proc_rele(p);
 }
 
        proc_rele(p);
 }
 

+/*
+ * Called once in proc_exit to clean up after an armed or pending realitexpire
+ *
+ * This will only be called after the proc refcount is drained,
+ * so realitexpire cannot be currently holding a proc ref.
+ * i.e. it will/has gotten PROC_NULL from proc_find.
+ */
+void
+proc_free_realitimer(proc_t p)
+{
+       proc_spinlock(p);
+
+       assert(p->p_rcall != NULL);
+       assert(p->p_refcount == 0);
+
+       timerclear(&p->p_realtimer.it_interval);
+
+       if (thread_call_cancel(p->p_rcall)) {
+               assert(p->p_ractive > 0);
+               p->p_ractive--;
+       }
+
+       while (p->p_ractive > 0) {
+               proc_spinunlock(p);
+
+               delay(1);
+
+               proc_spinlock(p);
+       }
+
+       thread_call_t call = p->p_rcall;
+       p->p_rcall = NULL;
+
+       proc_spinunlock(p);
+
+       thread_call_free(call);
+}
+

 /*
  * Check that a proposed value to load into the .it_value or
  * .it_interval part of an interval timer is acceptable.
 /*
  * Check that a proposed value to load into the .it_value or
  * .it_interval part of an interval timer is acceptable.


@@ -545,6 +611,18 @@ itimerfix(
        return (0);
 }
 
        return (0);
 }
 

+int
+timespec_is_valid(const struct timespec *ts)
+{
+       /* The INT32_MAX limit ensures the timespec is safe for clock_*() functions
+        * which accept 32-bit ints. */
+       if (ts->tv_sec < 0 || ts->tv_sec > INT32_MAX ||
+                       ts->tv_nsec < 0 || (unsigned long long)ts->tv_nsec > NSEC_PER_SEC) {
+               return 0;
+       }
+       return 1;
+}
+

 /*
  * Decrement an interval timer by a specified number
  * of microseconds, which must be less than a second,
 /*
  * Decrement an interval timer by a specified number
  * of microseconds, which must be less than a second,


@@ -636,6 +714,22 @@ timevalfix(
        }
 }
 
        }
 }
 

+static boolean_t
+timeval_fixusec(
+       struct timeval *t1)
+{
+       assert(t1->tv_usec >= 0);
+       assert(t1->tv_sec >= 0);
+
+       if (t1->tv_usec >= 1000000) {
+               if (os_add_overflow(t1->tv_sec, t1->tv_usec / 1000000, &t1->tv_sec))
+                       return FALSE;
+               t1->tv_usec = t1->tv_usec % 1000000;
+       }
+
+       return TRUE;
+}
+

 /*
  * Return the best possible estimate of the time in the timeval
  * to which tvp points.
 /*
  * Return the best possible estimate of the time in the timeval
  * to which tvp points.


@@ -653,6 +747,19 @@ microtime(
        tvp->tv_usec = tv_usec;
 }
 
        tvp->tv_usec = tv_usec;
 }
 

+void
+microtime_with_abstime(
+       struct timeval  *tvp, uint64_t *abstime)
+{
+       clock_sec_t             tv_sec;
+       clock_usec_t    tv_usec;
+
+       clock_get_calendar_absolute_and_microtime(&tv_sec, &tv_usec, abstime);
+
+       tvp->tv_sec = tv_sec;
+       tvp->tv_usec = tv_usec;
+}
+

 void
 microuptime(
        struct timeval  *tvp)
 void
 microuptime(
        struct timeval  *tvp)


@@ -708,6 +815,95 @@ tvtoabstime(
 
        return (result + usresult);
 }
 
        return (result + usresult);
 }

+
+uint64_t
+tstoabstime(struct timespec *ts)
+{
+       uint64_t abstime_s, abstime_ns;
+       clock_interval_to_absolutetime_interval(ts->tv_sec, NSEC_PER_SEC, &abstime_s);
+       clock_interval_to_absolutetime_interval(ts->tv_nsec, 1, &abstime_ns);
+       return abstime_s + abstime_ns;
+}
+
+#if NETWORKING
+/*
+ * ratecheck(): simple time-based rate-limit checking.
+ */
+int
+ratecheck(struct timeval *lasttime, const struct timeval *mininterval)
+{
+       struct timeval tv, delta;
+       int rv = 0;
+
+       net_uptime2timeval(&tv);
+       delta = tv;
+       timevalsub(&delta, lasttime);
+
+       /*
+        * check for 0,0 is so that the message will be seen at least once,
+        * even if interval is huge.
+        */
+       if (timevalcmp(&delta, mininterval, >=) ||
+           (lasttime->tv_sec == 0 && lasttime->tv_usec == 0)) {
+               *lasttime = tv;
+               rv = 1;
+       }
+
+       return (rv);
+}
+
+/*
+ * ppsratecheck(): packets (or events) per second limitation.
+ */
+int
+ppsratecheck(struct timeval *lasttime, int *curpps, int maxpps)
+{
+       struct timeval tv, delta;
+       int rv;
+
+       net_uptime2timeval(&tv);
+
+       timersub(&tv, lasttime, &delta);
+
+       /*
+        * Check for 0,0 so that the message will be seen at least once.
+        * If more than one second has passed since the last update of
+        * lasttime, reset the counter.
+        *
+        * we do increment *curpps even in *curpps < maxpps case, as some may
+        * try to use *curpps for stat purposes as well.
+        */
+       if ((lasttime->tv_sec == 0 && lasttime->tv_usec == 0) ||
+           delta.tv_sec >= 1) {
+               *lasttime = tv;
+               *curpps = 0;
+               rv = 1;
+       } else if (maxpps < 0)
+               rv = 1;
+       else if (*curpps < maxpps)
+               rv = 1;
+       else
+               rv = 0;
+
+#if 1 /* DIAGNOSTIC? */
+       /* be careful about wrap-around */
+       if (*curpps + 1 > 0)
+               *curpps = *curpps + 1;
+#else
+       /*
+        * assume that there's not too many calls to this function.
+        * not sure if the assumption holds, as it depends on *caller's*
+        * behavior, not the behavior of this function.
+        * IMHO it is wrong to make assumption on the caller's behavior,
+        * so the above #if is #if 1, not #ifdef DIAGNOSTIC.
+        */
+       *curpps = *curpps + 1;
+#endif
+
+       return (rv);
+}
+#endif /* NETWORKING */
+

 void
 time_zone_slock_init(void)
 {
 void
 time_zone_slock_init(void)
 {


@@ -722,3 +918,4 @@ time_zone_slock_init(void)
        /* Allocate the spin lock */
        tz_slock = lck_spin_alloc_init(tz_slock_grp, tz_slock_attr);
 }
        /* Allocate the spin lock */
        tz_slock = lck_spin_alloc_init(tz_slock_grp, tz_slock_attr);
 }

+