+ if (curp != targetp) {
+#if CONFIG_MACF
+ if ((error = mac_proc_check_sched(curp, targetp))) {
+ goto out;
+ }
+#endif
+ }
+
+ role = proc_get_task_policy(proc_task(targetp), TASK_POLICY_ATTRIBUTE, TASK_POLICY_ROLE);
+
+ *priority = proc_task_role_to_darwin_role(role);
+
+out:
+ kauth_cred_unref(&target_cred);
+ return error;
+}
+
+
+static int
+get_background_proc(struct proc *curp, struct proc *targetp, int *priority)
+{
+ int external = 0;
+ int error = 0;
+ kauth_cred_t ucred, target_cred;
+
+ ucred = kauth_cred_get();
+ target_cred = kauth_cred_proc_ref(targetp);
+
+ if (!kauth_cred_issuser(ucred) && kauth_cred_getruid(ucred) &&
+ kauth_cred_getuid(ucred) != kauth_cred_getuid(target_cred) &&
+ kauth_cred_getruid(ucred) != kauth_cred_getuid(target_cred)) {
+ error = EPERM;
+ goto out;
+ }
+
+ external = (curp == targetp) ? TASK_POLICY_INTERNAL : TASK_POLICY_EXTERNAL;
+
+ *priority = proc_get_task_policy(current_task(), external, TASK_POLICY_DARWIN_BG);
+
+out:
+ kauth_cred_unref(&target_cred);
+ return error;
+}
+
+static int
+do_background_proc(struct proc *curp, struct proc *targetp, int priority)
+{
+#if !CONFIG_MACF
+#pragma unused(curp)
+#endif
+ int error = 0;
+ kauth_cred_t ucred;
+ kauth_cred_t target_cred;
+ int external;
+ int enable;
+
+ ucred = kauth_cred_get();
+ target_cred = kauth_cred_proc_ref(targetp);
+
+ if (!kauth_cred_issuser(ucred) && kauth_cred_getruid(ucred) &&
+ kauth_cred_getuid(ucred) != kauth_cred_getuid(target_cred) &&
+ kauth_cred_getruid(ucred) != kauth_cred_getuid(target_cred)) {
+ error = EPERM;
+ goto out;
+ }
+
+#if CONFIG_MACF
+ error = mac_proc_check_sched(curp, targetp);
+ if (error) {
+ goto out;
+ }
+#endif
+
+ external = (curp == targetp) ? TASK_POLICY_INTERNAL : TASK_POLICY_EXTERNAL;
+
+ switch (priority) {
+ case PRIO_DARWIN_BG:
+ enable = TASK_POLICY_ENABLE;
+ break;
+ case PRIO_DARWIN_NONUI:
+ /* ignored for compatibility */
+ goto out;
+ default:
+ /* TODO: EINVAL if priority != 0 */
+ enable = TASK_POLICY_DISABLE;
+ break;
+ }
+
+ proc_set_task_policy(proc_task(targetp), external, TASK_POLICY_DARWIN_BG, enable);
+
+out:
+ kauth_cred_unref(&target_cred);
+ return error;
+}
+
+static void
+do_background_socket(struct proc *p, thread_t thread)
+{
+#if SOCKETS
+ struct fileproc *fp;
+ int background = false;
+#if NECP
+ int update_necp = false;
+#endif /* NECP */
+
+ proc_fdlock(p);
+
+ if (thread != THREAD_NULL) {
+ background = proc_get_effective_thread_policy(thread, TASK_POLICY_ALL_SOCKETS_BG);
+ } else {
+ background = proc_get_effective_task_policy(proc_task(p), TASK_POLICY_ALL_SOCKETS_BG);
+ }
+
+ if (background) {
+ /*
+ * For PRIO_DARWIN_PROCESS (thread is NULL), simply mark
+ * the sockets with the background flag. There's nothing
+ * to do here for the PRIO_DARWIN_THREAD case.
+ */
+ if (thread == THREAD_NULL) {
+ fdt_foreach(fp, p) {
+ if (FILEGLOB_DTYPE(fp->fp_glob) == DTYPE_SOCKET) {
+ struct socket *sockp = (struct socket *)fp->fp_glob->fg_data;
+ socket_set_traffic_mgt_flags(sockp, TRAFFIC_MGT_SO_BACKGROUND);
+ sockp->so_background_thread = NULL;
+ }
+#if NECP
+ else if (FILEGLOB_DTYPE(fp->fp_glob) == DTYPE_NETPOLICY) {
+ if (necp_set_client_as_background(p, fp, background)) {
+ update_necp = true;
+ }
+ }
+#endif /* NECP */
+ }
+ }
+ } else {
+ /* disable networking IO throttle.
+ * NOTE - It is a known limitation of the current design that we
+ * could potentially clear TRAFFIC_MGT_SO_BACKGROUND bit for
+ * sockets created by other threads within this process.
+ */
+ fdt_foreach(fp, p) {
+ struct socket *sockp;
+
+ if (FILEGLOB_DTYPE(fp->fp_glob) == DTYPE_SOCKET) {
+ sockp = (struct socket *)fp->fp_glob->fg_data;
+ /* skip if only clearing this thread's sockets */
+ if ((thread) && (sockp->so_background_thread != thread)) {
+ continue;
+ }
+ socket_clear_traffic_mgt_flags(sockp, TRAFFIC_MGT_SO_BACKGROUND);
+ sockp->so_background_thread = NULL;
+ }
+#if NECP
+ else if (FILEGLOB_DTYPE(fp->fp_glob) == DTYPE_NETPOLICY) {
+ if (necp_set_client_as_background(p, fp, background)) {
+ update_necp = true;
+ }
+ }
+#endif /* NECP */
+ }
+ }
+
+ proc_fdunlock(p);
+
+#if NECP
+ if (update_necp) {
+ necp_update_all_clients();
+ }
+#endif /* NECP */
+#else
+#pragma unused(p, thread)
+#endif
+}
+
+
+/*
+ * do_background_thread
+ *
+ * Requires: thread reference
+ *
+ * Returns: 0 Success
+ * EPERM Tried to background while in vfork
+ * XXX - todo - does this need a MACF hook?
+ */
+static int
+do_background_thread(thread_t thread, int priority)
+{
+ struct uthread *ut;
+ int enable, external;
+ int rv = 0;
+
+ ut = get_bsdthread_info(thread);
+
+ /* Backgrounding is unsupported for threads in vfork */
+ if ((ut->uu_flag & UT_VFORK) != 0) {
+ return EPERM;
+ }
+
+ /* Backgrounding is unsupported for workq threads */
+ if (thread_is_static_param(thread)) {
+ return EPERM;
+ }
+
+ /* Not allowed to combine QoS and DARWIN_BG, doing so strips the QoS */
+ if (thread_has_qos_policy(thread)) {
+ thread_remove_qos_policy(thread);
+ rv = EIDRM;
+ }
+
+ /* TODO: Fail if someone passes something besides 0 or PRIO_DARWIN_BG */
+ enable = (priority == PRIO_DARWIN_BG) ? TASK_POLICY_ENABLE : TASK_POLICY_DISABLE;
+ external = (current_thread() == thread) ? TASK_POLICY_INTERNAL : TASK_POLICY_EXTERNAL;
+
+ proc_set_thread_policy(thread, external, TASK_POLICY_DARWIN_BG, enable);
+
+ return rv;
+}
+
+
+/*
+ * Returns: 0 Success
+ * copyin:EFAULT
+ * dosetrlimit:
+ */
+/* ARGSUSED */
+int
+setrlimit(struct proc *p, struct setrlimit_args *uap, __unused int32_t *retval)
+{
+ struct rlimit alim;
+ int error;
+
+ if ((error = copyin(uap->rlp, (caddr_t)&alim,
+ sizeof(struct rlimit)))) {
+ return error;
+ }
+
+ return dosetrlimit(p, uap->which, &alim);
+}
+
+/*
+ * Returns: 0 Success
+ * EINVAL
+ * suser:EPERM
+ *
+ * Notes: EINVAL is returned both for invalid arguments, and in the
+ * case that the current usage (e.g. RLIMIT_STACK) is already
+ * in excess of the requested limit.
+ */
+int
+dosetrlimit(struct proc *p, u_int which, struct rlimit *newrlim)
+{
+ struct rlimit rlim;
+ int error;
+ kern_return_t kr;
+ int posix = (which & _RLIMIT_POSIX_FLAG) ? 1 : 0;
+
+ /* Mask out POSIX flag, saved above */
+ which &= ~_RLIMIT_POSIX_FLAG;
+
+ /* Unknown resource */
+ if (which >= RLIM_NLIMITS) {
+ return EINVAL;
+ }
+
+ /*
+ * Take a snapshot of the current rlimit values and read this throughout
+ * this routine. This minimizes the critical sections and allow other
+ * processes in the system to access the plimit while we are in the
+ * middle of this setrlimit call.
+ */
+ proc_lock(p);
+ rlim = p->p_limit->pl_rlimit[which];
+ proc_unlock(p);
+
+ error = 0;
+ /* Sanity check: new soft limit cannot exceed new hard limit */
+ if (newrlim->rlim_cur > newrlim->rlim_max) {
+ error = EINVAL;
+ }
+ /*
+ * Sanity check: only super-user may raise the hard limit.
+ * newrlim->rlim_cur > rlim.rlim_max implies that the call is increasing the hard limit as well.
+ */
+ else if (newrlim->rlim_cur > rlim.rlim_max || newrlim->rlim_max > rlim.rlim_max) {
+ /* suser() returns 0 if the calling thread is super user. */
+ error = suser(kauth_cred_get(), &p->p_acflag);
+ }
+
+ if (error) {
+ /* Invalid setrlimit request: EINVAL or EPERM */
+ return error;
+ }
+
+ /* Only one thread is able to change the current process's rlimit values */
+ proc_lock(p);
+ proc_limitblock(p);
+ proc_unlock(p);
+
+ /* We have the reader lock of the process's plimit so it's safe to read the rlimit values */
+ switch (which) {
+ case RLIMIT_CPU:
+ if (newrlim->rlim_cur == RLIM_INFINITY) {
+ task_vtimer_clear(p->task, TASK_VTIMER_RLIM);
+ timerclear(&p->p_rlim_cpu);
+ } else {
+ task_absolutetime_info_data_t tinfo;
+ mach_msg_type_number_t count;
+ struct timeval ttv, tv;
+ clock_sec_t tv_sec;
+ clock_usec_t tv_usec;
+
+ count = TASK_ABSOLUTETIME_INFO_COUNT;
+ task_info(p->task, TASK_ABSOLUTETIME_INFO, (task_info_t)&tinfo, &count);
+ absolutetime_to_microtime(tinfo.total_user + tinfo.total_system, &tv_sec, &tv_usec);
+ ttv.tv_sec = tv_sec;
+ ttv.tv_usec = tv_usec;
+
+ tv.tv_sec = (newrlim->rlim_cur > __INT_MAX__ ? __INT_MAX__ : (__darwin_time_t)newrlim->rlim_cur);
+ tv.tv_usec = 0;
+ timersub(&tv, &ttv, &p->p_rlim_cpu);
+
+ timerclear(&tv);
+ if (timercmp(&p->p_rlim_cpu, &tv, >)) {
+ task_vtimer_set(p->task, TASK_VTIMER_RLIM);
+ } else {
+ task_vtimer_clear(p->task, TASK_VTIMER_RLIM);
+
+ timerclear(&p->p_rlim_cpu);
+
+ psignal(p, SIGXCPU);
+ }
+ }
+ break;
+
+ case RLIMIT_DATA:
+ if (newrlim->rlim_cur > maxdmap) {
+ newrlim->rlim_cur = maxdmap;
+ }
+ if (newrlim->rlim_max > maxdmap) {
+ newrlim->rlim_max = maxdmap;
+ }
+ break;
+
+ case RLIMIT_STACK:
+ if (p->p_lflag & P_LCUSTOM_STACK) {
+ /* Process has a custom stack set - rlimit cannot be used to change it */
+ error = EINVAL;
+ goto out;
+ }
+
+ /* Disallow illegal stack size instead of clipping */
+ if (newrlim->rlim_cur > maxsmap ||
+ newrlim->rlim_max > maxsmap) {
+ if (posix) {
+ error = EINVAL;
+ goto out;
+ } else {
+ /*
+ * 4797860 - workaround poorly written installers by
+ * doing previous implementation (< 10.5) when caller
+ * is non-POSIX conforming.
+ */
+ if (newrlim->rlim_cur > maxsmap) {
+ newrlim->rlim_cur = maxsmap;
+ }
+ if (newrlim->rlim_max > maxsmap) {
+ newrlim->rlim_max = maxsmap;
+ }
+ }
+ }
+
+ /*
+ * Stack is allocated to the max at exec time with only
+ * "rlim_cur" bytes accessible. If stack limit is going
+ * up make more accessible, if going down make inaccessible.
+ */
+ if (newrlim->rlim_cur > rlim.rlim_cur) {
+ mach_vm_offset_t addr;
+ mach_vm_size_t size;
+
+ /* grow stack */
+ size = round_page_64(newrlim->rlim_cur);
+ size -= round_page_64(rlim.rlim_cur);
+
+ addr = (mach_vm_offset_t)(p->user_stack - round_page_64(newrlim->rlim_cur));
+ kr = mach_vm_protect(current_map(), addr, size, FALSE, VM_PROT_DEFAULT);
+ if (kr != KERN_SUCCESS) {
+ error = EINVAL;
+ goto out;
+ }
+ } else if (newrlim->rlim_cur < rlim.rlim_cur) {
+ mach_vm_offset_t addr;
+ mach_vm_size_t size;
+ uint64_t cur_sp;
+
+ /* shrink stack */
+
+ /*
+ * First check if new stack limit would agree
+ * with current stack usage.
+ * Get the current thread's stack pointer...
+ */
+ cur_sp = thread_adjuserstack(current_thread(), 0);
+ if (cur_sp <= p->user_stack &&
+ cur_sp > (p->user_stack - round_page_64(rlim.rlim_cur))) {
+ /* stack pointer is in main stack */
+ if (cur_sp <= (p->user_stack - round_page_64(newrlim->rlim_cur))) {
+ /*
+ * New limit would cause current usage to be invalid:
+ * reject new limit.
+ */
+ error = EINVAL;
+ goto out;
+ }
+ } else {
+ /* not on the main stack: reject */
+ error = EINVAL;
+ goto out;
+ }
+
+ size = round_page_64(rlim.rlim_cur);
+ size -= round_page_64(rlim.rlim_cur);
+
+ addr = (mach_vm_offset_t)(p->user_stack - round_page_64(rlim.rlim_cur));
+
+ kr = mach_vm_protect(current_map(), addr, size, FALSE, VM_PROT_NONE);
+ if (kr != KERN_SUCCESS) {
+ error = EINVAL;
+ goto out;
+ }
+ } else {
+ /* no change ... */
+ }
+ break;
+
+ case RLIMIT_NOFILE:
+ /*
+ * Nothing to be done here as we already performed the sanity checks before entering the switch code block.
+ * The real NOFILE limits enforced by the kernel is capped at MIN(RLIMIT_NOFILE, maxfilesperproc)
+ */
+ break;
+
+ case RLIMIT_NPROC:
+ /*
+ * Only root can set to the maxproc limits, as it is
+ * systemwide resource; all others are limited to
+ * maxprocperuid (presumably less than maxproc).
+ */
+ if (kauth_cred_issuser(kauth_cred_get())) {
+ if (newrlim->rlim_cur > (rlim_t)maxproc) {
+ newrlim->rlim_cur = maxproc;
+ }
+ if (newrlim->rlim_max > (rlim_t)maxproc) {
+ newrlim->rlim_max = maxproc;
+ }
+ } else {
+ if (newrlim->rlim_cur > (rlim_t)maxprocperuid) {
+ newrlim->rlim_cur = maxprocperuid;
+ }
+ if (newrlim->rlim_max > (rlim_t)maxprocperuid) {
+ newrlim->rlim_max = maxprocperuid;
+ }
+ }
+ break;
+
+ case RLIMIT_MEMLOCK:
+ /*
+ * Tell the Mach VM layer about the new limit value.
+ */
+ newrlim->rlim_cur = (vm_size_t)newrlim->rlim_cur;
+ vm_map_set_user_wire_limit(current_map(), (vm_size_t)newrlim->rlim_cur);
+ break;
+ } /* switch... */
+
+ /* Everything checks out and we are now ready to update the rlimit */
+ error = 0;
+
+out:
+
+ if (error == 0) {
+ /*
+ * COW the current plimit if it's shared, otherwise update it in place.
+ * Finally unblock other threads wishing to change plimit.
+ */
+ proc_lock(p);
+ proc_limitupdate(p, newrlim, (uint8_t)which);
+ proc_limitunblock(p);
+ proc_unlock(p);
+ } else {
+ /*
+ * This setrlimit has failed, just leave the plimit as is and unblock other
+ * threads wishing to change plimit.
+ */
+ proc_lock(p);
+ proc_limitunblock(p);
+ proc_unlock(p);
+ }
+
+ return error;
+}
+
+/* ARGSUSED */
+int
+getrlimit(struct proc *p, struct getrlimit_args *uap, __unused int32_t *retval)
+{
+ struct rlimit lim = {};
+
+ /*
+ * Take out flag now in case we need to use it to trigger variant
+ * behaviour later.
+ */
+ uap->which &= ~_RLIMIT_POSIX_FLAG;
+
+ if (uap->which >= RLIM_NLIMITS) {
+ return EINVAL;
+ }
+ proc_limitget(p, uap->which, &lim);
+ return copyout((caddr_t)&lim,
+ uap->rlp, sizeof(struct rlimit));
+}
+
+/*
+ * Transform the running time and tick information in proc p into user,
+ * system, and interrupt time usage.
+ */
+/* No lock on proc is held for this.. */
+void
+calcru(struct proc *p, struct timeval *up, struct timeval *sp, struct timeval *ip)
+{
+ task_t task;
+
+ timerclear(up);
+ timerclear(sp);
+ if (ip != NULL) {
+ timerclear(ip);
+ }
+
+ task = p->task;
+ if (task) {
+ mach_task_basic_info_data_t tinfo;
+ task_thread_times_info_data_t ttimesinfo;
+ task_events_info_data_t teventsinfo;
+ mach_msg_type_number_t task_info_count, task_ttimes_count;
+ mach_msg_type_number_t task_events_count;
+ struct timeval ut, st;
+
+ task_info_count = MACH_TASK_BASIC_INFO_COUNT;
+ task_info(task, MACH_TASK_BASIC_INFO,
+ (task_info_t)&tinfo, &task_info_count);
+ ut.tv_sec = tinfo.user_time.seconds;
+ ut.tv_usec = tinfo.user_time.microseconds;
+ st.tv_sec = tinfo.system_time.seconds;
+ st.tv_usec = tinfo.system_time.microseconds;
+ timeradd(&ut, up, up);
+ timeradd(&st, sp, sp);
+
+ task_ttimes_count = TASK_THREAD_TIMES_INFO_COUNT;
+ task_info(task, TASK_THREAD_TIMES_INFO,
+ (task_info_t)&ttimesinfo, &task_ttimes_count);
+
+ ut.tv_sec = ttimesinfo.user_time.seconds;
+ ut.tv_usec = ttimesinfo.user_time.microseconds;
+ st.tv_sec = ttimesinfo.system_time.seconds;
+ st.tv_usec = ttimesinfo.system_time.microseconds;
+ timeradd(&ut, up, up);
+ timeradd(&st, sp, sp);
+
+ task_events_count = TASK_EVENTS_INFO_COUNT;
+ task_info(task, TASK_EVENTS_INFO,
+ (task_info_t)&teventsinfo, &task_events_count);
+
+ /*
+ * No need to lock "p": this does not need to be
+ * completely consistent, right ?
+ */
+ p->p_stats->p_ru.ru_minflt = (teventsinfo.faults -
+ teventsinfo.pageins);
+ p->p_stats->p_ru.ru_majflt = teventsinfo.pageins;
+ p->p_stats->p_ru.ru_nivcsw = (teventsinfo.csw -
+ p->p_stats->p_ru.ru_nvcsw);
+ if (p->p_stats->p_ru.ru_nivcsw < 0) {
+ p->p_stats->p_ru.ru_nivcsw = 0;
+ }
+
+ p->p_stats->p_ru.ru_maxrss = (long)tinfo.resident_size_max;
+ }
+}
+
+__private_extern__ void munge_user64_rusage(struct rusage *a_rusage_p, struct user64_rusage *a_user_rusage_p);
+__private_extern__ void munge_user32_rusage(struct rusage *a_rusage_p, struct user32_rusage *a_user_rusage_p);
+
+/* ARGSUSED */
+int
+getrusage(struct proc *p, struct getrusage_args *uap, __unused int32_t *retval)
+{
+ struct rusage *rup, rubuf;
+ struct user64_rusage rubuf64 = {};
+ struct user32_rusage rubuf32 = {};
+ size_t retsize = sizeof(rubuf); /* default: 32 bits */
+ caddr_t retbuf = (caddr_t)&rubuf; /* default: 32 bits */
+ struct timeval utime;
+ struct timeval stime;
+
+
+ switch (uap->who) {
+ case RUSAGE_SELF:
+ calcru(p, &utime, &stime, NULL);
+ proc_lock(p);
+ rup = &p->p_stats->p_ru;
+ rup->ru_utime = utime;
+ rup->ru_stime = stime;
+
+ rubuf = *rup;
+ proc_unlock(p);
+
+ break;
+
+ case RUSAGE_CHILDREN:
+ proc_lock(p);
+ rup = &p->p_stats->p_cru;
+ rubuf = *rup;
+ proc_unlock(p);
+ break;
+
+ default:
+ return EINVAL;
+ }
+ if (IS_64BIT_PROCESS(p)) {
+ retsize = sizeof(rubuf64);
+ retbuf = (caddr_t)&rubuf64;
+ munge_user64_rusage(&rubuf, &rubuf64);
+ } else {
+ retsize = sizeof(rubuf32);
+ retbuf = (caddr_t)&rubuf32;
+ munge_user32_rusage(&rubuf, &rubuf32);
+ }
+
+ return copyout(retbuf, uap->rusage, retsize);
+}
+
+void
+ruadd(struct rusage *ru, struct rusage *ru2)
+{
+ long *ip, *ip2;
+ long i;
+
+ timeradd(&ru->ru_utime, &ru2->ru_utime, &ru->ru_utime);
+ timeradd(&ru->ru_stime, &ru2->ru_stime, &ru->ru_stime);
+ if (ru->ru_maxrss < ru2->ru_maxrss) {
+ ru->ru_maxrss = ru2->ru_maxrss;
+ }
+ ip = &ru->ru_first; ip2 = &ru2->ru_first;
+ for (i = &ru->ru_last - &ru->ru_first; i >= 0; i--) {
+ *ip++ += *ip2++;
+ }
+}
+
+/*
+ * Add the rusage stats of child in parent.
+ *
+ * It adds rusage statistics of child process and statistics of all its
+ * children to its parent.
+ *
+ * Note: proc lock of parent should be held while calling this function.
+ */
+void
+update_rusage_info_child(struct rusage_info_child *ri, rusage_info_current *ri_current)
+{
+ ri->ri_child_user_time += (ri_current->ri_user_time +
+ ri_current->ri_child_user_time);
+ ri->ri_child_system_time += (ri_current->ri_system_time +
+ ri_current->ri_child_system_time);
+ ri->ri_child_pkg_idle_wkups += (ri_current->ri_pkg_idle_wkups +
+ ri_current->ri_child_pkg_idle_wkups);
+ ri->ri_child_interrupt_wkups += (ri_current->ri_interrupt_wkups +
+ ri_current->ri_child_interrupt_wkups);
+ ri->ri_child_pageins += (ri_current->ri_pageins +
+ ri_current->ri_child_pageins);
+ ri->ri_child_elapsed_abstime += ((ri_current->ri_proc_exit_abstime -
+ ri_current->ri_proc_start_abstime) + ri_current->ri_child_elapsed_abstime);
+}
+
+/*
+ * Reading soft limit from specified resource.
+ */
+rlim_t
+proc_limitgetcur(proc_t p, int which, boolean_t to_lock_proc)
+{
+ rlim_t rlim_cur;
+
+ assert(p);
+ assert(which < RLIM_NLIMITS);
+
+ /*
+ * Serialize access to the process's plimit pointer for concurrent threads.
+ */
+ if (to_lock_proc) {
+ lck_mtx_assert(&p->p_mlock, LCK_MTX_ASSERT_NOTOWNED);
+ proc_lock(p);
+ }
+
+ rlim_cur = p->p_limit->pl_rlimit[which].rlim_cur;
+
+ if (to_lock_proc) {
+ proc_unlock(p);
+ }
+
+ return rlim_cur;
+}
+
+/*
+ * Writing soft limit to specified resource. This is an internal function
+ * used only by proc_exit and vfork_exit_internal to update RLIMIT_FSIZE in
+ * place without invoking setrlimit.
+ */
+void
+proc_limitsetcur_internal(proc_t p, int which, rlim_t value)
+{
+ struct rlimit rlim;
+
+ assert(p);
+ assertf(which == RLIMIT_FSIZE, "%s only supports RLIMIT_FSIZE\n", __FUNCTION__);
+
+
+ proc_lock(p);
+
+ /* Only one thread is able to change rlimit values at a time */
+ proc_limitblock(p);
+
+ /* Prepare an rlimit for proc_limitupdate */
+ rlim = p->p_limit->pl_rlimit[which];
+ rlim.rlim_cur = value;
+
+ /*
+ * proc_limitupdate will COW the current plimit and update specified the soft limit
+ * if the plimit is shared, otherwise it will update the soft limit in place.
+ */
+ proc_limitupdate(p, &rlim, (uint8_t)which);
+
+ /* Unblock other threads wishing to change plimit */
+ proc_limitunblock(p);
+
+ proc_unlock(p);
+}
+
+void
+proc_limitget(proc_t p, int which, struct rlimit * limp)
+{
+ assert(p);
+ assert(limp);
+ assert(which < RLIM_NLIMITS);
+
+ /* Protect writes to the process's plimit pointer issued by concurrent threads */
+ proc_lock(p);
+
+ limp->rlim_cur = p->p_limit->pl_rlimit[which].rlim_cur;
+ limp->rlim_max = p->p_limit->pl_rlimit[which].rlim_max;
+
+ proc_unlock(p);
+}
+
+void
+proc_limitfork(proc_t parent, proc_t child)
+{
+ assert(parent && child);
+
+ proc_lock(parent);
+
+ /* Child proc inherits parent's plimit */
+ child->p_limit = parent->p_limit;
+
+ /* Increment refcnt of the shared plimit */
+ os_ref_retain(&parent->p_limit->pl_refcnt);
+
+ proc_unlock(parent);
+}
+
+void
+proc_limitdrop(proc_t p)
+{
+ struct plimit *free_plim = NULL;
+ os_ref_count_t refcnt;
+
+ proc_lock(p);
+
+ /* Drop the plimit reference before exiting the system */
+ refcnt = os_ref_release(&p->p_limit->pl_refcnt);
+ if (refcnt == 0) {
+ free_plim = p->p_limit;
+ }
+
+ p->p_limit = NULL;
+ proc_unlock(p);
+
+ /* We are the last user of this plimit, free it now. */
+ if (free_plim != NULL) {
+ zfree(plimit_zone, free_plim);
+ }
+}
+
+/*
+ * proc_limitblock/unblock are used to serialize access to plimit
+ * from concurrent threads within the same process.
+ * Callers must be holding the proc lock to enter, return with
+ * the proc lock locked
+ */
+void
+proc_limitblock(proc_t p)
+{
+ lck_mtx_assert(&p->p_mlock, LCK_MTX_ASSERT_OWNED);
+
+ while (p->p_lflag & P_LLIMCHANGE) {
+ p->p_lflag |= P_LLIMWAIT;
+ msleep(&p->p_limit, &p->p_mlock, 0, "proc_limitblock", NULL);
+ }
+ p->p_lflag |= P_LLIMCHANGE;
+}
+
+/*
+ * Callers must be holding the proc lock to enter, return with
+ * the proc lock locked
+ */
+void
+proc_limitunblock(proc_t p)
+{
+ lck_mtx_assert(&p->p_mlock, LCK_MTX_ASSERT_OWNED);
+
+ p->p_lflag &= ~P_LLIMCHANGE;
+ if (p->p_lflag & P_LLIMWAIT) {
+ p->p_lflag &= ~P_LLIMWAIT;
+ wakeup(&p->p_limit);
+ }
+}
+
+/*
+ * Change the rlimit values of process "p" to "rlim" for resource "which".
+ *
+ * If the current plimit is shared by multiple processes (refcnt > 1):
+ * this routine replaces the process's original plimit with a new plimit,
+ * update the requeted rlimit values, and free the original plimit if this
+ * process is the last user.
+ *
+ * If the current plimit is used only by the calling process (refcnt == 1):
+ * this routine updates the new rlimit values in place.
+ *
+ * Note: caller must be holding the proc lock before entering this routine.
+ * This routine allocates and frees kernel memory without holding the proc lock
+ * to minimize contention, and returns with the proc lock held.
+ */
+void
+proc_limitupdate(proc_t p, struct rlimit *rlim, uint8_t which)
+{
+ struct plimit *copy_plim;
+ struct plimit *free_plim;
+ os_ref_count_t refcnt;
+
+ assert(p && p->p_limit);
+ assert(rlim);
+ assert(which < RLIM_NLIMITS);
+ lck_mtx_assert(&p->p_mlock, LCK_MTX_ASSERT_OWNED);
+
+ /*
+ * If we are the only user of this plimit, don't bother allocating a plimit
+ * before making changes. Just modify the rlimit values in place.
+ */
+ refcnt = os_ref_get_count(&p->p_limit->pl_refcnt);
+ if (refcnt == 1) {
+ p->p_limit->pl_rlimit[which] = *rlim;
+ return;
+ }
+
+ /*
+ * Allocating a new plimit for this process to apply the requested rlimit values.
+ * Not holding the lock on the original plimit gives other processes in the system
+ * a chance to access the plimit while we wait for memory below.
+ *
+ * The default zalloc should always succeed when WAIT flag.
+ */
+ proc_unlock(p);
+ copy_plim = zalloc(plimit_zone);
+
+ /* Copy the current p_limit */
+ proc_lock(p);
+ bcopy(p->p_limit->pl_rlimit, copy_plim->pl_rlimit, sizeof(struct rlimit) * RLIM_NLIMITS);
+
+ /*
+ * Drop our reference to the old plimit. Other processes sharing the old plimit could
+ * have exited the system when we wait for memory for the new plimit above, thus, we
+ * need to check the refcnt again and free the old plimit if this process is the last
+ * user. Also since we are holding the proc lock here, it's impossible for another threads
+ * to dereference the plimit, so it's safe to free the old plimit memory.
+ */
+ free_plim = NULL;
+ refcnt = os_ref_release(&p->p_limit->pl_refcnt);
+ if (refcnt == 0) {
+ free_plim = p->p_limit;
+ }
+ /* Initialize the newly allocated plimit */
+ os_ref_init_count(©_plim->pl_refcnt, &rlimit_refgrp, 1);
+
+ /* Apply new rlimit values */
+ copy_plim->pl_rlimit[which] = *rlim;
+
+ /* All set, update the process's plimit pointer to the new plimit. */
+ p->p_limit = copy_plim;
+ proc_unlock(p);
+
+ if (free_plim != NULL) {
+ zfree(plimit_zone, free_plim);
+ }
+
+ /* Return with proc->p_mlock locked */
+ proc_lock(p);
+}
+
+static int
+iopolicysys_disk(struct proc *p, int cmd, int scope, int policy, struct _iopol_param_t *iop_param);
+static int
+iopolicysys_vfs_hfs_case_sensitivity(struct proc *p, int cmd, int scope, int policy, struct _iopol_param_t *iop_param);
+static int
+iopolicysys_vfs_atime_updates(struct proc *p, int cmd, int scope, int policy, struct _iopol_param_t *iop_param);
+static int
+iopolicysys_vfs_materialize_dataless_files(struct proc *p, int cmd, int scope, int policy, struct _iopol_param_t *iop_param);
+static int
+iopolicysys_vfs_statfs_no_data_volume(struct proc *p, int cmd, int scope, int policy, struct _iopol_param_t *iop_param);
+static int
+iopolicysys_vfs_trigger_resolve(struct proc *p, int cmd, int scope, int policy, struct _iopol_param_t *iop_param);
+static int
+iopolicysys_vfs_ignore_content_protection(struct proc *p, int cmd, int scope, int policy, struct _iopol_param_t *iop_param);
+static int
+iopolicysys_vfs_ignore_node_permissions(struct proc *p, int cmd, int scope, int policy, struct _iopol_param_t *ipo_param);
+static int
+iopolicysys_vfs_skip_mtime_update(struct proc *p, int cmd, int scope, int policy, struct _iopol_param_t *iop_param);
+
+/*
+ * iopolicysys
+ *
+ * Description: System call MUX for use in manipulating I/O policy attributes of the current process or thread
+ *
+ * Parameters: cmd Policy command
+ * arg Pointer to policy arguments
+ *
+ * Returns: 0 Success
+ * EINVAL Invalid command or invalid policy arguments
+ *
+ */
+int
+iopolicysys(struct proc *p, struct iopolicysys_args *uap, int32_t *retval)
+{
+ int error = 0;
+ struct _iopol_param_t iop_param;
+
+ if ((error = copyin(uap->arg, &iop_param, sizeof(iop_param))) != 0) {
+ goto out;
+ }
+
+ switch (iop_param.iop_iotype) {
+ case IOPOL_TYPE_DISK:
+ error = iopolicysys_disk(p, uap->cmd, iop_param.iop_scope, iop_param.iop_policy, &iop_param);
+ if (error == EIDRM) {
+ *retval = -2;
+ error = 0;
+ }
+ if (error) {
+ goto out;
+ }
+ break;
+ case IOPOL_TYPE_VFS_HFS_CASE_SENSITIVITY:
+ error = iopolicysys_vfs_hfs_case_sensitivity(p, uap->cmd, iop_param.iop_scope, iop_param.iop_policy, &iop_param);
+ if (error) {
+ goto out;
+ }
+ break;
+ case IOPOL_TYPE_VFS_ATIME_UPDATES:
+ error = iopolicysys_vfs_atime_updates(p, uap->cmd, iop_param.iop_scope, iop_param.iop_policy, &iop_param);
+ if (error) {
+ goto out;
+ }
+ break;
+ case IOPOL_TYPE_VFS_MATERIALIZE_DATALESS_FILES:
+ error = iopolicysys_vfs_materialize_dataless_files(p, uap->cmd, iop_param.iop_scope, iop_param.iop_policy, &iop_param);
+ if (error) {
+ goto out;
+ }
+ break;
+ case IOPOL_TYPE_VFS_STATFS_NO_DATA_VOLUME:
+ error = iopolicysys_vfs_statfs_no_data_volume(p, uap->cmd, iop_param.iop_scope, iop_param.iop_policy, &iop_param);
+ if (error) {
+ goto out;
+ }
+ break;
+ case IOPOL_TYPE_VFS_TRIGGER_RESOLVE:
+ error = iopolicysys_vfs_trigger_resolve(p, uap->cmd, iop_param.iop_scope, iop_param.iop_policy, &iop_param);
+ if (error) {
+ goto out;
+ }
+ break;
+ case IOPOL_TYPE_VFS_IGNORE_CONTENT_PROTECTION:
+ error = iopolicysys_vfs_ignore_content_protection(p, uap->cmd, iop_param.iop_scope, iop_param.iop_policy, &iop_param);
+ if (error) {
+ goto out;
+ }
+ break;
+ case IOPOL_TYPE_VFS_IGNORE_PERMISSIONS:
+ error = iopolicysys_vfs_ignore_node_permissions(p, uap->cmd, iop_param.iop_scope, iop_param.iop_policy, &iop_param);
+ if (error) {
+ goto out;
+ }
+ break;
+ case IOPOL_TYPE_VFS_SKIP_MTIME_UPDATE:
+ error = iopolicysys_vfs_skip_mtime_update(p, uap->cmd, iop_param.iop_scope, iop_param.iop_policy, &iop_param);
+ if (error) {
+ goto out;
+ }
+ break;
+ default:
+ error = EINVAL;
+ goto out;
+ }
+
+ /* Individual iotype handlers are expected to update iop_param, if requested with a GET command */
+ if (uap->cmd == IOPOL_CMD_GET) {
+ error = copyout((caddr_t)&iop_param, uap->arg, sizeof(iop_param));
+ if (error) {
+ goto out;
+ }
+ }
+
+out:
+ return error;
+}
+
+static int
+iopolicysys_disk(struct proc *p __unused, int cmd, int scope, int policy, struct _iopol_param_t *iop_param)
+{
+ int error = 0;
+ thread_t thread;
+ int policy_flavor;
+
+ /* Validate scope */
+ switch (scope) {
+ case IOPOL_SCOPE_PROCESS:
+ thread = THREAD_NULL;
+ policy_flavor = TASK_POLICY_IOPOL;
+ break;
+
+ case IOPOL_SCOPE_THREAD:
+ thread = current_thread();
+ policy_flavor = TASK_POLICY_IOPOL;
+
+ /* Not allowed to combine QoS and (non-PASSIVE) IO policy, doing so strips the QoS */
+ if (cmd == IOPOL_CMD_SET && thread_has_qos_policy(thread)) {
+ switch (policy) {
+ case IOPOL_DEFAULT:
+ case IOPOL_PASSIVE:
+ break;
+ case IOPOL_UTILITY:
+ case IOPOL_THROTTLE:
+ case IOPOL_IMPORTANT:
+ case IOPOL_STANDARD:
+ if (!thread_is_static_param(thread)) {
+ thread_remove_qos_policy(thread);
+ /*
+ * This is not an error case, this is to return a marker to user-space that
+ * we stripped the thread of its QoS class.
+ */
+ error = EIDRM;
+ break;
+ }
+ OS_FALLTHROUGH;
+ default:
+ error = EINVAL;
+ goto out;
+ }
+ }
+ break;
+
+ case IOPOL_SCOPE_DARWIN_BG:
+#if !defined(XNU_TARGET_OS_OSX)
+ /* We don't want this on platforms outside of macOS as BG is always IOPOL_THROTTLE */
+ error = ENOTSUP;
+ goto out;
+#else /* !defined(XNU_TARGET_OS_OSX) */
+ thread = THREAD_NULL;
+ policy_flavor = TASK_POLICY_DARWIN_BG_IOPOL;
+ break;
+#endif /* !defined(XNU_TARGET_OS_OSX) */
+
+ default:
+ error = EINVAL;
+ goto out;
+ }
+
+ /* Validate policy */
+ if (cmd == IOPOL_CMD_SET) {
+ switch (policy) {
+ case IOPOL_DEFAULT:
+ if (scope == IOPOL_SCOPE_DARWIN_BG) {
+ /* the current default BG throttle level is UTILITY */
+ policy = IOPOL_UTILITY;
+ } else {
+ policy = IOPOL_IMPORTANT;
+ }
+ break;
+ case IOPOL_UTILITY:
+ /* fall-through */
+ case IOPOL_THROTTLE:
+ /* These levels are OK */
+ break;
+ case IOPOL_IMPORTANT:
+ /* fall-through */
+ case IOPOL_STANDARD:
+ /* fall-through */
+ case IOPOL_PASSIVE:
+ if (scope == IOPOL_SCOPE_DARWIN_BG) {
+ /* These levels are invalid for BG */
+ error = EINVAL;
+ goto out;
+ } else {
+ /* OK for other scopes */
+ }
+ break;
+ default:
+ error = EINVAL;
+ goto out;
+ }
+ }
+
+ /* Perform command */
+ switch (cmd) {
+ case IOPOL_CMD_SET:
+ if (thread != THREAD_NULL) {
+ proc_set_thread_policy(thread, TASK_POLICY_INTERNAL, policy_flavor, policy);
+ } else {
+ proc_set_task_policy(current_task(), TASK_POLICY_INTERNAL, policy_flavor, policy);
+ }
+ break;
+ case IOPOL_CMD_GET:
+ if (thread != THREAD_NULL) {
+ policy = proc_get_thread_policy(thread, TASK_POLICY_INTERNAL, policy_flavor);
+ } else {
+ policy = proc_get_task_policy(current_task(), TASK_POLICY_INTERNAL, policy_flavor);
+ }
+ iop_param->iop_policy = policy;
+ break;
+ default:
+ error = EINVAL; /* unknown command */
+ break;
+ }
+
+out:
+ return error;
+}
+
+static int
+iopolicysys_vfs_hfs_case_sensitivity(struct proc *p, int cmd, int scope, int policy, struct _iopol_param_t *iop_param)
+{
+ int error = 0;
+
+ /* Validate scope */
+ switch (scope) {
+ case IOPOL_SCOPE_PROCESS:
+ /* Only process OK */
+ break;
+ default:
+ error = EINVAL;
+ goto out;
+ }
+
+ /* Validate policy */
+ if (cmd == IOPOL_CMD_SET) {
+ switch (policy) {
+ case IOPOL_VFS_HFS_CASE_SENSITIVITY_DEFAULT:
+ /* fall-through */
+ case IOPOL_VFS_HFS_CASE_SENSITIVITY_FORCE_CASE_SENSITIVE:
+ /* These policies are OK */
+ break;
+ default:
+ error = EINVAL;
+ goto out;
+ }
+ }
+
+ /* Perform command */
+ switch (cmd) {
+ case IOPOL_CMD_SET:
+ if (0 == kauth_cred_issuser(kauth_cred_get())) {
+ /* If it's a non-root process, it needs to have the entitlement to set the policy */
+ boolean_t entitled = FALSE;
+ entitled = IOTaskHasEntitlement(current_task(), "com.apple.private.iopol.case_sensitivity");
+ if (!entitled) {
+ error = EPERM;
+ goto out;
+ }
+ }
+
+ switch (policy) {
+ case IOPOL_VFS_HFS_CASE_SENSITIVITY_DEFAULT:
+ OSBitAndAtomic16(~((uint32_t)P_VFS_IOPOLICY_FORCE_HFS_CASE_SENSITIVITY), &p->p_vfs_iopolicy);
+ break;
+ case IOPOL_VFS_HFS_CASE_SENSITIVITY_FORCE_CASE_SENSITIVE:
+ OSBitOrAtomic16((uint32_t)P_VFS_IOPOLICY_FORCE_HFS_CASE_SENSITIVITY, &p->p_vfs_iopolicy);
+ break;
+ default:
+ error = EINVAL;
+ goto out;
+ }
+
+ break;
+ case IOPOL_CMD_GET:
+ iop_param->iop_policy = (p->p_vfs_iopolicy & P_VFS_IOPOLICY_FORCE_HFS_CASE_SENSITIVITY)
+ ? IOPOL_VFS_HFS_CASE_SENSITIVITY_FORCE_CASE_SENSITIVE
+ : IOPOL_VFS_HFS_CASE_SENSITIVITY_DEFAULT;
+ break;
+ default:
+ error = EINVAL; /* unknown command */
+ break;
+ }
+
+out:
+ return error;
+}
+
+static inline int
+get_thread_atime_policy(struct uthread *ut)
+{
+ return (ut->uu_flag & UT_ATIME_UPDATE) ? IOPOL_ATIME_UPDATES_OFF : IOPOL_ATIME_UPDATES_DEFAULT;
+}
+
+static inline void
+set_thread_atime_policy(struct uthread *ut, int policy)
+{
+ if (policy == IOPOL_ATIME_UPDATES_OFF) {
+ ut->uu_flag |= UT_ATIME_UPDATE;
+ } else {
+ ut->uu_flag &= ~UT_ATIME_UPDATE;
+ }
+}
+
+static inline void
+set_task_atime_policy(struct proc *p, int policy)
+{
+ if (policy == IOPOL_ATIME_UPDATES_OFF) {
+ OSBitOrAtomic16((uint16_t)P_VFS_IOPOLICY_ATIME_UPDATES, &p->p_vfs_iopolicy);
+ } else {
+ OSBitAndAtomic16(~((uint16_t)P_VFS_IOPOLICY_ATIME_UPDATES), &p->p_vfs_iopolicy);
+ }
+}
+
+static inline int
+get_task_atime_policy(struct proc *p)
+{
+ return (p->p_vfs_iopolicy & P_VFS_IOPOLICY_ATIME_UPDATES) ? IOPOL_ATIME_UPDATES_OFF : IOPOL_ATIME_UPDATES_DEFAULT;
+}
+
+static int
+iopolicysys_vfs_atime_updates(struct proc *p __unused, int cmd, int scope, int policy, struct _iopol_param_t *iop_param)
+{
+ int error = 0;
+ thread_t thread;
+
+ /* Validate scope */
+ switch (scope) {
+ case IOPOL_SCOPE_THREAD:
+ thread = current_thread();
+ break;
+ case IOPOL_SCOPE_PROCESS:
+ thread = THREAD_NULL;
+ break;
+ default:
+ error = EINVAL;
+ goto out;
+ }
+
+ /* Validate policy */
+ if (cmd == IOPOL_CMD_SET) {
+ switch (policy) {
+ case IOPOL_ATIME_UPDATES_DEFAULT:
+ case IOPOL_ATIME_UPDATES_OFF:
+ break;
+ default:
+ error = EINVAL;
+ goto out;
+ }
+ }
+
+ /* Perform command */
+ switch (cmd) {
+ case IOPOL_CMD_SET:
+ if (thread != THREAD_NULL) {
+ set_thread_atime_policy(get_bsdthread_info(thread), policy);
+ } else {
+ set_task_atime_policy(p, policy);
+ }
+ break;
+ case IOPOL_CMD_GET:
+ if (thread != THREAD_NULL) {
+ policy = get_thread_atime_policy(get_bsdthread_info(thread));
+ } else {
+ policy = get_task_atime_policy(p);
+ }
+ iop_param->iop_policy = policy;
+ break;
+ default:
+ error = EINVAL; /* unknown command */
+ break;
+ }
+
+out:
+ return error;
+}
+
+static inline int
+get_thread_materialize_policy(struct uthread *ut)
+{
+ if (ut->uu_flag & UT_NSPACE_NODATALESSFAULTS) {
+ return IOPOL_MATERIALIZE_DATALESS_FILES_OFF;
+ } else if (ut->uu_flag & UT_NSPACE_FORCEDATALESSFAULTS) {
+ return IOPOL_MATERIALIZE_DATALESS_FILES_ON;
+ }
+ /* Default thread behavior is "inherit process behavior". */
+ return IOPOL_MATERIALIZE_DATALESS_FILES_DEFAULT;
+}
+
+static inline void
+set_thread_materialize_policy(struct uthread *ut, int policy)
+{
+ if (policy == IOPOL_MATERIALIZE_DATALESS_FILES_OFF) {
+ ut->uu_flag &= ~UT_NSPACE_FORCEDATALESSFAULTS;
+ ut->uu_flag |= UT_NSPACE_NODATALESSFAULTS;
+ } else if (policy == IOPOL_MATERIALIZE_DATALESS_FILES_ON) {
+ ut->uu_flag &= ~UT_NSPACE_NODATALESSFAULTS;
+ ut->uu_flag |= UT_NSPACE_FORCEDATALESSFAULTS;
+ } else {
+ ut->uu_flag &= ~(UT_NSPACE_NODATALESSFAULTS | UT_NSPACE_FORCEDATALESSFAULTS);
+ }
+}
+
+static inline void
+set_proc_materialize_policy(struct proc *p, int policy)
+{
+ if (policy == IOPOL_MATERIALIZE_DATALESS_FILES_DEFAULT) {
+ /*
+ * Caller has specified "use the default policy".
+ * The default policy is to NOT materialize dataless
+ * files.
+ */
+ policy = IOPOL_MATERIALIZE_DATALESS_FILES_OFF;
+ }
+ if (policy == IOPOL_MATERIALIZE_DATALESS_FILES_ON) {
+ OSBitOrAtomic16((uint16_t)P_VFS_IOPOLICY_MATERIALIZE_DATALESS_FILES, &p->p_vfs_iopolicy);
+ } else {
+ OSBitAndAtomic16(~((uint16_t)P_VFS_IOPOLICY_MATERIALIZE_DATALESS_FILES), &p->p_vfs_iopolicy);
+ }
+}
+
+static int
+get_proc_materialize_policy(struct proc *p)
+{
+ return (p->p_vfs_iopolicy & P_VFS_IOPOLICY_MATERIALIZE_DATALESS_FILES) ? IOPOL_MATERIALIZE_DATALESS_FILES_ON : IOPOL_MATERIALIZE_DATALESS_FILES_OFF;
+}
+
+static int
+iopolicysys_vfs_materialize_dataless_files(struct proc *p __unused, int cmd, int scope, int policy, struct _iopol_param_t *iop_param)
+{
+ int error = 0;
+ thread_t thread;
+
+ /* Validate scope */
+ switch (scope) {
+ case IOPOL_SCOPE_THREAD:
+ thread = current_thread();
+ break;
+ case IOPOL_SCOPE_PROCESS:
+ thread = THREAD_NULL;
+ break;
+ default:
+ error = EINVAL;
+ goto out;
+ }
+
+ /* Validate policy */
+ if (cmd == IOPOL_CMD_SET) {
+ switch (policy) {
+ case IOPOL_MATERIALIZE_DATALESS_FILES_DEFAULT:
+ case IOPOL_MATERIALIZE_DATALESS_FILES_OFF:
+ case IOPOL_MATERIALIZE_DATALESS_FILES_ON:
+ break;
+ default:
+ error = EINVAL;
+ goto out;
+ }
+ }
+
+ /* Perform command */
+ switch (cmd) {
+ case IOPOL_CMD_SET:
+ if (thread != THREAD_NULL) {
+ set_thread_materialize_policy(get_bsdthread_info(thread), policy);
+ } else {
+ set_proc_materialize_policy(p, policy);
+ }
+ break;
+ case IOPOL_CMD_GET:
+ if (thread != THREAD_NULL) {
+ policy = get_thread_materialize_policy(get_bsdthread_info(thread));
+ } else {
+ policy = get_proc_materialize_policy(p);
+ }
+ iop_param->iop_policy = policy;
+ break;
+ default:
+ error = EINVAL; /* unknown command */
+ break;
+ }
+
+out:
+ return error;
+}
+
+static int
+iopolicysys_vfs_statfs_no_data_volume(struct proc *p __unused, int cmd,
+ int scope, int policy, struct _iopol_param_t *iop_param)
+{
+ int error = 0;
+
+ /* Validate scope */
+ switch (scope) {
+ case IOPOL_SCOPE_PROCESS:
+ /* Only process OK */
+ break;
+ default:
+ error = EINVAL;
+ goto out;
+ }
+
+ /* Validate policy */
+ if (cmd == IOPOL_CMD_SET) {
+ switch (policy) {
+ case IOPOL_VFS_STATFS_NO_DATA_VOLUME_DEFAULT:
+ /* fall-through */
+ case IOPOL_VFS_STATFS_FORCE_NO_DATA_VOLUME:
+ /* These policies are OK */
+ break;
+ default:
+ error = EINVAL;
+ goto out;
+ }
+ }
+
+ /* Perform command */
+ switch (cmd) {
+ case IOPOL_CMD_SET:
+ if (0 == kauth_cred_issuser(kauth_cred_get())) {
+ /* If it's a non-root process, it needs to have the entitlement to set the policy */
+ boolean_t entitled = FALSE;
+ entitled = IOTaskHasEntitlement(current_task(), "com.apple.private.iopol.case_sensitivity");
+ if (!entitled) {
+ error = EPERM;
+ goto out;
+ }
+ }
+
+ switch (policy) {
+ case IOPOL_VFS_STATFS_NO_DATA_VOLUME_DEFAULT:
+ OSBitAndAtomic16(~((uint32_t)P_VFS_IOPOLICY_STATFS_NO_DATA_VOLUME), &p->p_vfs_iopolicy);
+ break;
+ case IOPOL_VFS_STATFS_FORCE_NO_DATA_VOLUME:
+ OSBitOrAtomic16((uint32_t)P_VFS_IOPOLICY_STATFS_NO_DATA_VOLUME, &p->p_vfs_iopolicy);
+ break;
+ default:
+ error = EINVAL;
+ goto out;
+ }
+
+ break;
+ case IOPOL_CMD_GET:
+ iop_param->iop_policy = (p->p_vfs_iopolicy & P_VFS_IOPOLICY_STATFS_NO_DATA_VOLUME)
+ ? IOPOL_VFS_STATFS_FORCE_NO_DATA_VOLUME
+ : IOPOL_VFS_STATFS_NO_DATA_VOLUME_DEFAULT;
+ break;
+ default:
+ error = EINVAL; /* unknown command */
+ break;
+ }
+
+out:
+ return error;
+}
+
+static int
+iopolicysys_vfs_trigger_resolve(struct proc *p __unused, int cmd,
+ int scope, int policy, struct _iopol_param_t *iop_param)
+{
+ int error = 0;
+
+ /* Validate scope */
+ switch (scope) {
+ case IOPOL_SCOPE_PROCESS:
+ /* Only process OK */
+ break;
+ default:
+ error = EINVAL;
+ goto out;
+ }
+
+ /* Validate policy */
+ if (cmd == IOPOL_CMD_SET) {
+ switch (policy) {
+ case IOPOL_VFS_TRIGGER_RESOLVE_DEFAULT:
+ /* fall-through */
+ case IOPOL_VFS_TRIGGER_RESOLVE_OFF:
+ /* These policies are OK */
+ break;
+ default:
+ error = EINVAL;
+ goto out;
+ }
+ }
+
+ /* Perform command */
+ switch (cmd) {
+ case IOPOL_CMD_SET:
+ switch (policy) {
+ case IOPOL_VFS_TRIGGER_RESOLVE_DEFAULT:
+ OSBitAndAtomic16(~((uint32_t)P_VFS_IOPOLICY_TRIGGER_RESOLVE_DISABLE), &p->p_vfs_iopolicy);
+ break;
+ case IOPOL_VFS_TRIGGER_RESOLVE_OFF:
+ OSBitOrAtomic16((uint32_t)P_VFS_IOPOLICY_TRIGGER_RESOLVE_DISABLE, &p->p_vfs_iopolicy);
+ break;
+ default:
+ error = EINVAL;
+ goto out;
+ }
+
+ break;
+ case IOPOL_CMD_GET:
+ iop_param->iop_policy = (p->p_vfs_iopolicy & P_VFS_IOPOLICY_TRIGGER_RESOLVE_DISABLE)
+ ? IOPOL_VFS_TRIGGER_RESOLVE_OFF
+ : IOPOL_VFS_TRIGGER_RESOLVE_DEFAULT;
+ break;
+ default:
+ error = EINVAL; /* unknown command */
+ break;
+ }
+
+out:
+ return error;
+}
+
+static int
+iopolicysys_vfs_ignore_content_protection(struct proc *p, int cmd, int scope,
+ int policy, struct _iopol_param_t *iop_param)
+{
+ int error = 0;
+
+ /* Validate scope */
+ switch (scope) {
+ case IOPOL_SCOPE_PROCESS:
+ /* Only process OK */
+ break;
+ default:
+ error = EINVAL;
+ goto out;
+ }
+
+ /* Validate policy */
+ if (cmd == IOPOL_CMD_SET) {
+ switch (policy) {
+ case IOPOL_VFS_CONTENT_PROTECTION_DEFAULT:
+ OS_FALLTHROUGH;
+ case IOPOL_VFS_CONTENT_PROTECTION_IGNORE:
+ /* These policies are OK */
+ break;
+ default:
+ error = EINVAL;
+ goto out;
+ }
+ }
+
+ /* Perform command */
+ switch (cmd) {
+ case IOPOL_CMD_SET:
+ if (0 == kauth_cred_issuser(kauth_cred_get())) {
+ /* If it's a non-root process, it needs to have the entitlement to set the policy */
+ boolean_t entitled = FALSE;
+ entitled = IOTaskHasEntitlement(current_task(), "com.apple.private.iopol.case_sensitivity");
+ if (!entitled) {
+ error = EPERM;
+ goto out;
+ }
+ }
+
+ switch (policy) {
+ case IOPOL_VFS_CONTENT_PROTECTION_DEFAULT:
+ os_atomic_andnot(&p->p_vfs_iopolicy, P_VFS_IOPOLICY_IGNORE_CONTENT_PROTECTION, relaxed);
+ break;
+ case IOPOL_VFS_CONTENT_PROTECTION_IGNORE:
+ os_atomic_or(&p->p_vfs_iopolicy, P_VFS_IOPOLICY_IGNORE_CONTENT_PROTECTION, relaxed);
+ break;
+ default:
+ error = EINVAL;
+ goto out;
+ }
+
+ break;
+ case IOPOL_CMD_GET:
+ iop_param->iop_policy = (os_atomic_load(&p->p_vfs_iopolicy, relaxed) & P_VFS_IOPOLICY_IGNORE_CONTENT_PROTECTION)
+ ? IOPOL_VFS_CONTENT_PROTECTION_IGNORE
+ : IOPOL_VFS_CONTENT_PROTECTION_DEFAULT;
+ break;
+ default:
+ error = EINVAL; /* unknown command */
+ break;
+ }
+
+out:
+ return error;
+}
+
+#define AUTHORIZED_ACCESS_ENTITLEMENT \
+ "com.apple.private.vfs.authorized-access"
+int
+iopolicysys_vfs_ignore_node_permissions(struct proc *p, int cmd, int scope,
+ int policy, __unused struct _iopol_param_t *iop_param)
+{
+ int error = EINVAL;
+
+ switch (scope) {
+ case IOPOL_SCOPE_PROCESS:
+ break;
+ default:
+ goto out;
+ }
+
+ switch (cmd) {
+ case IOPOL_CMD_GET:
+ policy = os_atomic_load(&p->p_vfs_iopolicy, relaxed) & P_VFS_IOPOLICY_IGNORE_NODE_PERMISSIONS ?
+ IOPOL_VFS_IGNORE_PERMISSIONS_ON : IOPOL_VFS_IGNORE_PERMISSIONS_OFF;
+ iop_param->iop_policy = policy;
+ goto out_ok;
+ case IOPOL_CMD_SET:
+ /* SET is handled after the switch */
+ break;
+ default:
+ goto out;
+ }
+
+ if (!IOTaskHasEntitlement(current_task(), AUTHORIZED_ACCESS_ENTITLEMENT)) {
+ error = EPERM;
+ goto out;
+ }
+
+ switch (policy) {
+ case IOPOL_VFS_IGNORE_PERMISSIONS_OFF:
+ os_atomic_andnot(&p->p_vfs_iopolicy, P_VFS_IOPOLICY_IGNORE_NODE_PERMISSIONS, relaxed);
+ break;
+ case IOPOL_VFS_IGNORE_PERMISSIONS_ON:
+ os_atomic_or(&p->p_vfs_iopolicy, P_VFS_IOPOLICY_IGNORE_NODE_PERMISSIONS, relaxed);
+ break;
+ default:
+ break;
+ }
+
+out_ok:
+ error = 0;
+out:
+ return error;
+}
+
+#define SKIP_MTIME_UPDATE_ENTITLEMENT \
+ "com.apple.private.vfs.skip-mtime-updates"
+int
+iopolicysys_vfs_skip_mtime_update(struct proc *p, int cmd, int scope,
+ int policy, __unused struct _iopol_param_t *iop_param)
+{
+ int error = EINVAL;
+
+ switch (scope) {
+ case IOPOL_SCOPE_PROCESS:
+ break;
+ default:
+ goto out;
+ }
+
+ switch (cmd) {
+ case IOPOL_CMD_GET:
+ policy = os_atomic_load(&p->p_vfs_iopolicy, relaxed) & P_VFS_IOPOLICY_SKIP_MTIME_UPDATE ?
+ IOPOL_VFS_SKIP_MTIME_UPDATE_ON : IOPOL_VFS_SKIP_MTIME_UPDATE_OFF;
+ iop_param->iop_policy = policy;
+ goto out_ok;
+ case IOPOL_CMD_SET:
+ break;
+ default:
+ break;
+ }
+
+ if (!IOTaskHasEntitlement(current_task(), SKIP_MTIME_UPDATE_ENTITLEMENT)) {
+ error = EPERM;
+ goto out;
+ }
+
+ switch (policy) {
+ case IOPOL_VFS_SKIP_MTIME_UPDATE_OFF:
+ os_atomic_andnot(&p->p_vfs_iopolicy, P_VFS_IOPOLICY_SKIP_MTIME_UPDATE, relaxed);
+ break;
+ case IOPOL_VFS_SKIP_MTIME_UPDATE_ON:
+ os_atomic_or(&p->p_vfs_iopolicy, P_VFS_IOPOLICY_SKIP_MTIME_UPDATE, relaxed);
+ break;
+ default:
+ break;
+ }
+
+out_ok:
+ error = 0;
+out:
+ return error;
+}
+/* BSD call back function for task_policy networking changes */
+void
+proc_apply_task_networkbg(void * bsd_info, thread_t thread)
+{
+ assert(bsd_info != PROC_NULL);
+
+ pid_t pid = proc_pid((proc_t)bsd_info);
+
+ proc_t p = proc_find(pid);
+
+ if (p != PROC_NULL) {
+ assert(p == (proc_t)bsd_info);
+
+ do_background_socket(p, thread);
+ proc_rele(p);
+ }
+}
+
+void
+gather_rusage_info(proc_t p, rusage_info_current *ru, int flavor)
+{
+ struct rusage_info_child *ri_child;
+
+ assert(p->p_stats != NULL);
+ memset(ru, 0, sizeof(*ru));
+ switch (flavor) {
+ case RUSAGE_INFO_V5:
+#if !XNU_TARGET_OS_OSX && __has_feature(ptrauth_calls)
+ if (vm_shared_region_is_reslide(p->task)) {
+ ru->ri_flags |= RU_PROC_RUNS_RESLIDE;
+ }
+#endif /* !XNU_TARGET_OS_OSX && __has_feature(ptrauth_calls) */
+ OS_FALLTHROUGH;
+ case RUSAGE_INFO_V4:
+ ru->ri_logical_writes = get_task_logical_writes(p->task, FALSE);
+ ru->ri_lifetime_max_phys_footprint = get_task_phys_footprint_lifetime_max(p->task);
+#if CONFIG_LEDGER_INTERVAL_MAX
+ ru->ri_interval_max_phys_footprint = get_task_phys_footprint_interval_max(p->task, FALSE);
+#endif
+ fill_task_monotonic_rusage(p->task, ru);
+ OS_FALLTHROUGH;
+
+ case RUSAGE_INFO_V3:
+ fill_task_qos_rusage(p->task, ru);
+ fill_task_billed_usage(p->task, ru);
+ OS_FALLTHROUGH;
+
+ case RUSAGE_INFO_V2:
+ fill_task_io_rusage(p->task, ru);
+ OS_FALLTHROUGH;
+
+ case RUSAGE_INFO_V1:
+ /*
+ * p->p_stats->ri_child statistics are protected under proc lock.
+ */
+ proc_lock(p);
+
+ ri_child = &(p->p_stats->ri_child);
+ ru->ri_child_user_time = ri_child->ri_child_user_time;
+ ru->ri_child_system_time = ri_child->ri_child_system_time;
+ ru->ri_child_pkg_idle_wkups = ri_child->ri_child_pkg_idle_wkups;
+ ru->ri_child_interrupt_wkups = ri_child->ri_child_interrupt_wkups;
+ ru->ri_child_pageins = ri_child->ri_child_pageins;
+ ru->ri_child_elapsed_abstime = ri_child->ri_child_elapsed_abstime;
+
+ proc_unlock(p);
+ OS_FALLTHROUGH;
+
+ case RUSAGE_INFO_V0:
+ proc_getexecutableuuid(p, (unsigned char *)&ru->ri_uuid, sizeof(ru->ri_uuid));
+ fill_task_rusage(p->task, ru);
+ ru->ri_proc_start_abstime = p->p_stats->ps_start;
+ }
+}
+
+int
+proc_get_rusage(proc_t p, int flavor, user_addr_t buffer, __unused int is_zombie)
+{
+ rusage_info_current ri_current = {};
+
+ int error = 0;
+ size_t size = 0;
+
+ switch (flavor) {
+ case RUSAGE_INFO_V0:
+ size = sizeof(struct rusage_info_v0);
+ break;
+
+ case RUSAGE_INFO_V1:
+ size = sizeof(struct rusage_info_v1);
+ break;
+
+ case RUSAGE_INFO_V2:
+ size = sizeof(struct rusage_info_v2);
+ break;
+
+ case RUSAGE_INFO_V3:
+ size = sizeof(struct rusage_info_v3);
+ break;
+
+ case RUSAGE_INFO_V4:
+ size = sizeof(struct rusage_info_v4);
+ break;
+
+ case RUSAGE_INFO_V5:
+ size = sizeof(struct rusage_info_v5);
+ break;
+ default:
+ return EINVAL;
+ }
+
+ if (size == 0) {
+ return EINVAL;
+ }
+
+ /*
+ * If task is still alive, collect info from the live task itself.
+ * Otherwise, look to the cached info in the zombie proc.
+ */
+ if (p->p_ru == NULL) {
+ gather_rusage_info(p, &ri_current, flavor);
+ ri_current.ri_proc_exit_abstime = 0;
+ error = copyout(&ri_current, buffer, size);
+ } else {
+ ri_current = p->p_ru->ri;
+ error = copyout(&p->p_ru->ri, buffer, size);
+ }
+
+ return error;
+}
+
+static int
+mach_to_bsd_rv(int mach_rv)
+{
+ int bsd_rv = 0;
+
+ switch (mach_rv) {
+ case KERN_SUCCESS:
+ bsd_rv = 0;
+ break;
+ case KERN_INVALID_ARGUMENT:
+ bsd_rv = EINVAL;
+ break;
+ default:
+ panic("unknown error %#x", mach_rv);
+ }
+
+ return bsd_rv;
+}
+
+/*
+ * Resource limit controls
+ *
+ * uap->flavor available flavors:
+ *
+ * RLIMIT_WAKEUPS_MONITOR
+ * RLIMIT_CPU_USAGE_MONITOR
+ * RLIMIT_THREAD_CPULIMITS
+ * RLIMIT_FOOTPRINT_INTERVAL
+ */
+int
+proc_rlimit_control(__unused struct proc *p, struct proc_rlimit_control_args *uap, __unused int32_t *retval)
+{
+ proc_t targetp;
+ int error = 0;
+ struct proc_rlimit_control_wakeupmon wakeupmon_args;
+ uint32_t cpumon_flags;
+ uint32_t cpulimits_flags;
+ kauth_cred_t my_cred, target_cred;
+#if CONFIG_LEDGER_INTERVAL_MAX
+ uint32_t footprint_interval_flags;
+ uint64_t interval_max_footprint;
+#endif /* CONFIG_LEDGER_INTERVAL_MAX */
+
+ /* -1 implicitly means our own process (perhaps even the current thread for per-thread attributes) */
+ if (uap->pid == -1) {
+ targetp = proc_self();
+ } else {
+ targetp = proc_find(uap->pid);
+ }
+
+ /* proc_self() can return NULL for an exiting process */
+ if (targetp == PROC_NULL) {
+ return ESRCH;
+ }
+
+ my_cred = kauth_cred_get();
+ target_cred = kauth_cred_proc_ref(targetp);
+
+ if (!kauth_cred_issuser(my_cred) && kauth_cred_getruid(my_cred) &&
+ kauth_cred_getuid(my_cred) != kauth_cred_getuid(target_cred) &&
+ kauth_cred_getruid(my_cred) != kauth_cred_getuid(target_cred)) {
+ proc_rele(targetp);
+ kauth_cred_unref(&target_cred);
+ return EACCES;
+ }
+
+ switch (uap->flavor) {
+ case RLIMIT_WAKEUPS_MONITOR:
+ if ((error = copyin(uap->arg, &wakeupmon_args, sizeof(wakeupmon_args))) != 0) {
+ break;
+ }
+ if ((error = mach_to_bsd_rv(task_wakeups_monitor_ctl(targetp->task, &wakeupmon_args.wm_flags,
+ &wakeupmon_args.wm_rate))) != 0) {
+ break;
+ }
+ error = copyout(&wakeupmon_args, uap->arg, sizeof(wakeupmon_args));
+ break;
+ case RLIMIT_CPU_USAGE_MONITOR:
+ cpumon_flags = (uint32_t)uap->arg; // XXX temporarily stashing flags in argp (12592127)
+ error = mach_to_bsd_rv(task_cpu_usage_monitor_ctl(targetp->task, &cpumon_flags));
+ break;
+ case RLIMIT_THREAD_CPULIMITS:
+ cpulimits_flags = (uint32_t)uap->arg; // only need a limited set of bits, pass in void * argument
+
+ if (uap->pid != -1) {
+ error = EINVAL;
+ break;
+ }
+
+ uint8_t percent = 0;
+ uint32_t ms_refill = 0;
+ uint64_t ns_refill;
+
+ percent = (uint8_t)(cpulimits_flags & 0xffU); /* low 8 bits for percent */
+ ms_refill = (cpulimits_flags >> 8) & 0xffffff; /* next 24 bits represent ms refill value */
+ if (percent >= 100) {
+ error = EINVAL;
+ break;
+ }
+
+ ns_refill = ((uint64_t)ms_refill) * NSEC_PER_MSEC;
+
+ error = mach_to_bsd_rv(thread_set_cpulimit(THREAD_CPULIMIT_BLOCK, percent, ns_refill));
+ break;
+
+#if CONFIG_LEDGER_INTERVAL_MAX
+ case RLIMIT_FOOTPRINT_INTERVAL:
+ footprint_interval_flags = (uint32_t)uap->arg; // XXX temporarily stashing flags in argp (12592127)
+ /*
+ * There is currently only one option for this flavor.
+ */
+ if ((footprint_interval_flags & FOOTPRINT_INTERVAL_RESET) == 0) {
+ error = EINVAL;
+ break;
+ }
+ interval_max_footprint = get_task_phys_footprint_interval_max(targetp->task, TRUE);
+ break;
+#endif /* CONFIG_LEDGER_INTERVAL_MAX */
+ default:
+ error = EINVAL;
+ break;
+ }
+
+ proc_rele(targetp);
+ kauth_cred_unref(&target_cred);
+
+ /*
+ * Return value from this function becomes errno to userland caller.
+ */
+ return error;
+}
+
+/*
+ * Return the current amount of CPU consumed by this thread (in either user or kernel mode)
+ */
+int
+thread_selfusage(struct proc *p __unused, struct thread_selfusage_args *uap __unused, uint64_t *retval)
+{
+ uint64_t runtime;
+
+ runtime = thread_get_runtime_self();
+ *retval = runtime;
+
+ return 0;
+}
+
+#if !MONOTONIC
+int
+thread_selfcounts(__unused struct proc *p, __unused struct thread_selfcounts_args *uap, __unused int *ret_out)
+{
+ return ENOTSUP;
projects / apple / xnu.git / blobdiff