#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/priv.h>
#include <sys/proc_internal.h>
#include <sys/proc.h>
#include <sys/kauth.h>
#include <sys/unistd.h>
#include <sys/buf.h>
#include <sys/ioctl.h>
#include <sys/vm.h>
#include <sys/user.h>
#include <mach/machine.h>
#include <mach/mach_types.h>
#include <mach/vm_param.h>
#include <kern/task.h>
#include <kern/kalloc.h>
#include <kern/assert.h>
#include <kern/policy_internal.h>
#include <vm/vm_kern.h>
#include <vm/vm_map.h>
#include <mach/host_info.h>
#include <mach/task_info.h>
#include <mach/thread_info.h>
#include <mach/vm_region.h>
#include <sys/process_policy.h>
#include <sys/proc_info.h>
#include <sys/bsdtask_info.h>
#include <sys/kdebug.h>
#include <sys/sysproto.h>
#include <sys/msgbuf.h>
#include <machine/machine_routines.h>
#include <kern/ipc_misc.h>
#include <vm/vm_protos.h>
#if CONFIG_EMBEDDED
#include <sys/kern_memorystatus.h>
#endif
#if CONFIG_MACF
#include <security/mac.h>
#include <security/mac_framework.h>
#endif
static int handle_lowresource(int scope, int action, int policy, int policy_subtype, user_addr_t attrp, proc_t proc, uint64_t target_threadid);
static int handle_cpuuse(int action, user_addr_t attrp, proc_t proc, uint64_t target_threadid);
static int handle_apptype(int scope, int action, int policy, int policy_subtype, user_addr_t attrp, proc_t proc, uint64_t target_threadid);
static int handle_boost(int scope, int action, int policy, int policy_subtype, user_addr_t attrp, proc_t proc, uint64_t target_threadid);
extern kern_return_t task_suspend(task_t);
extern kern_return_t task_resume(task_t);
#if CONFIG_EMBEDDED
static int handle_applifecycle(int scope, int action, int policy, int policy_subtype, user_addr_t attrp, proc_t proc, uint64_t target_threadid);
#endif
int
process_policy(__unused struct proc *p, struct process_policy_args * uap, __unused int32_t *retval)
{
int error = 0;
int scope = uap->scope;
int policy = uap->policy;
int action = uap->action;
int policy_subtype = uap->policy_subtype;
user_addr_t attrp = uap->attrp;
pid_t target_pid = uap->target_pid;
uint64_t target_threadid = uap->target_threadid;
proc_t target_proc = PROC_NULL;
#if CONFIG_MACF || !CONFIG_EMBEDDED
proc_t curp = current_proc();
#endif
kauth_cred_t my_cred;
#if CONFIG_EMBEDDED
kauth_cred_t target_cred;
#endif
if ((scope != PROC_POLICY_SCOPE_PROCESS) && (scope != PROC_POLICY_SCOPE_THREAD)) {
return EINVAL;
}
if (target_pid == 0 || target_pid == proc_selfpid()) {
target_proc = proc_self();
} else {
target_proc = proc_find(target_pid);
}
if (target_proc == PROC_NULL) {
return ESRCH;
}
my_cred = kauth_cred_get();
#if CONFIG_EMBEDDED
target_cred = kauth_cred_proc_ref(target_proc);
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))
#else
if ((policy != PROC_POLICY_RESOURCE_STARVATION) &&
(policy != PROC_POLICY_APPTYPE) &&
(!kauth_cred_issuser(my_cred) && curp != target_proc))
#endif
{
error = EPERM;
goto out;
}
#if CONFIG_MACF
switch (policy) {
case PROC_POLICY_BOOST:
case PROC_POLICY_RESOURCE_USAGE:
#if CONFIG_EMBEDDED
case PROC_POLICY_APPTYPE:
case PROC_POLICY_APP_LIFECYCLE:
#endif
break;
default:
error = mac_proc_check_sched(curp, target_proc);
if (error) {
goto out;
}
break;
}
#endif
switch (policy) {
case PROC_POLICY_BACKGROUND:
error = ENOTSUP;
break;
case PROC_POLICY_HARDWARE_ACCESS:
error = ENOTSUP;
break;
case PROC_POLICY_RESOURCE_STARVATION:
error = handle_lowresource(scope, action, policy, policy_subtype, attrp, target_proc, target_threadid);
break;
case PROC_POLICY_RESOURCE_USAGE:
switch (policy_subtype) {
case PROC_POLICY_RUSAGE_NONE:
case PROC_POLICY_RUSAGE_WIREDMEM:
case PROC_POLICY_RUSAGE_VIRTMEM:
case PROC_POLICY_RUSAGE_DISK:
case PROC_POLICY_RUSAGE_NETWORK:
case PROC_POLICY_RUSAGE_POWER:
error = ENOTSUP;
goto out;
default:
error = EINVAL;
goto out;
case PROC_POLICY_RUSAGE_CPU:
break;
}
error = handle_cpuuse(action, attrp, target_proc, target_threadid);
break;
#if CONFIG_EMBEDDED
case PROC_POLICY_APP_LIFECYCLE:
error = handle_applifecycle(scope, action, policy, policy_subtype, attrp, target_proc, target_threadid);
break;
#endif
case PROC_POLICY_APPTYPE:
error = handle_apptype(scope, action, policy, policy_subtype, attrp, target_proc, target_threadid);
break;
case PROC_POLICY_BOOST:
error = handle_boost(scope, action, policy, policy_subtype, attrp, target_proc, target_threadid);
break;
default:
error = EINVAL;
break;
}
out:
proc_rele(target_proc);
#if CONFIG_EMBEDDED
kauth_cred_unref(&target_cred);
#endif
return error;
}
static int
handle_lowresource(__unused int scope, int action, __unused int policy, int policy_subtype, __unused user_addr_t attrp, proc_t proc, __unused uint64_t target_threadid)
{
int error = 0;
switch (policy_subtype) {
case PROC_POLICY_RS_NONE:
case PROC_POLICY_RS_VIRTUALMEM:
break;
default:
return EINVAL;
}
if (action == PROC_POLICY_ACTION_RESTORE) {
error = proc_resetpcontrol(proc_pid(proc));
} else {
error = EINVAL;
}
return error;
}
static int
handle_cpuuse(int action, user_addr_t attrp, proc_t proc, __unused uint64_t target_threadid)
{
proc_policy_cpuusage_attr_t cpuattr = { };
#if CONFIG_MACF || !CONFIG_EMBEDDED
proc_t curp = current_proc();
#endif
Boolean privileged = FALSE;
Boolean canEnable = FALSE;
uint64_t interval = -1ULL;
int error = 0;
uint8_t percentage;
#if !CONFIG_EMBEDDED
if ((action == PROC_POLICY_ACTION_APPLY || action == PROC_POLICY_ACTION_RESTORE)
&& curp != proc) {
return EPERM;
}
privileged = TRUE;
#endif
#if CONFIG_MACF
if (!privileged) {
privileged = (priv_check_cred(kauth_cred_get(), PRIV_PROC_CPUMON_OVERRIDE, 0) == 0);
}
canEnable = (privileged && action == PROC_POLICY_ACTION_ENABLE);
if (!canEnable && curp != proc) {
error = mac_proc_check_sched(curp, proc);
if (error) {
return error;
}
}
#endif
switch (action) {
case PROC_POLICY_ACTION_GET:
error = proc_get_task_ruse_cpu(proc->task, &cpuattr.ppattr_cpu_attr,
&percentage,
&cpuattr.ppattr_cpu_attr_interval,
&cpuattr.ppattr_cpu_attr_deadline);
if (error == 0) {
cpuattr.ppattr_cpu_percentage = percentage;
cpuattr.ppattr_cpu_attr_interval /= NSEC_PER_SEC;
error = copyout((proc_policy_cpuusage_attr_t *)&cpuattr, (user_addr_t)attrp, sizeof(proc_policy_cpuusage_attr_t));
}
break;
case PROC_POLICY_ACTION_APPLY:
case PROC_POLICY_ACTION_SET:
error = copyin((user_addr_t)attrp, (proc_policy_cpuusage_attr_t *)&cpuattr, sizeof(proc_policy_cpuusage_attr_t));
if (error != 0) {
return error;
}
if (cpuattr.ppattr_cpu_attr_interval != -1ULL) {
interval = cpuattr.ppattr_cpu_attr_interval * NSEC_PER_SEC;
} else {
interval = -1ULL;
}
error = proc_set_task_ruse_cpu(proc->task, cpuattr.ppattr_cpu_attr,
cpuattr.ppattr_cpu_percentage,
interval,
cpuattr.ppattr_cpu_attr_deadline,
privileged);
break;
case PROC_POLICY_ACTION_RESTORE:
error = proc_clear_task_ruse_cpu(proc->task, privileged);
break;
case PROC_POLICY_ACTION_ENABLE:
error = task_resume_cpumon(proc->task);
break;
case PROC_POLICY_ACTION_REMOVE:
default:
error = EINVAL;
break;
}
return error;
}
#if CONFIG_EMBEDDED
static int
handle_applifecycle(__unused int scope,
int action,
__unused int policy,
int policy_subtype,
user_addr_t attrp,
proc_t proc,
uint64_t target_threadid)
{
int error = 0;
int state = 0;
switch (policy_subtype) {
case PROC_POLICY_APPLIFE_NONE:
error = 0;
break;
case PROC_POLICY_APPLIFE_STATE:
error = ENOTSUP;
break;
case PROC_POLICY_APPLIFE_DEVSTATUS:
#if CONFIG_MACF
error = mac_proc_check_suspend_resume(current_proc(), MAC_PROC_CHECK_HIBERNATE);
if (error) {
error = EPERM;
goto out;
}
#endif
#if CONFIG_MEMORYSTATUS
if (action == PROC_POLICY_ACTION_APPLY) {
memorystatus_on_inactivity(proc);
error = 0;
} else
#endif
{
error = EINVAL;
}
break;
case PROC_POLICY_APPLIFE_PIDBIND:
#if CONFIG_MACF
error = mac_proc_check_suspend_resume(current_proc(), MAC_PROC_CHECK_PIDBIND);
if (error) {
error = EPERM;
goto out;
}
#endif
error = copyin((user_addr_t)attrp, (int *)&state, sizeof(int));
if (error != 0) {
goto out;
}
if (action == PROC_POLICY_ACTION_APPLY) {
error = proc_lf_pidbind(current_task(), target_threadid, proc->task, state);
} else {
error = EINVAL;
}
break;
default:
error = EINVAL;
break;
}
out:
return error;
}
#endif
static int
handle_apptype( int scope,
int action,
__unused int policy,
int policy_subtype,
__unused user_addr_t attrp,
proc_t target_proc,
__unused uint64_t target_threadid)
{
int error = 0;
if (scope != PROC_POLICY_SCOPE_PROCESS) {
return EINVAL;
}
switch (policy_subtype) {
case PROC_POLICY_IOS_DONATEIMP:
if (action != PROC_POLICY_ACTION_ENABLE) {
return EINVAL;
}
if (target_proc != current_proc()) {
return EINVAL;
}
task_importance_mark_donor(target_proc->task, TRUE);
return 0;
case PROC_POLICY_IOS_HOLDIMP:
if (action != PROC_POLICY_ACTION_ENABLE) {
return EINVAL;
}
if (target_proc != current_proc()) {
return EINVAL;
}
error = task_importance_hold_legacy_external_assertion(current_task(), 1);
return error;
case PROC_POLICY_IOS_DROPIMP:
if (action != PROC_POLICY_ACTION_ENABLE) {
return EINVAL;
}
if (target_proc != current_proc()) {
return EINVAL;
}
error = task_importance_drop_legacy_external_assertion(current_task(), 1);
return error;
default:
break;
}
if (policy_subtype != PROC_POLICY_OSX_APPTYPE_TAL) {
return EINVAL;
}
if (kauth_cred_issuser(kauth_cred_get()) == 0) {
return EPERM;
}
if (proc_task_is_tal(target_proc->task) == FALSE) {
return EINVAL;
}
switch (action) {
case PROC_POLICY_ACTION_ENABLE:
proc_set_task_policy(target_proc->task,
TASK_POLICY_ATTRIBUTE, TASK_POLICY_TAL,
TASK_POLICY_ENABLE);
break;
case PROC_POLICY_ACTION_DISABLE:
proc_set_task_policy(target_proc->task,
TASK_POLICY_ATTRIBUTE, TASK_POLICY_TAL,
TASK_POLICY_DISABLE);
break;
default:
return EINVAL;
}
return 0;
}
static int
handle_boost(int scope,
int action,
__unused int policy,
int policy_subtype,
__unused user_addr_t attrp,
proc_t target_proc,
__unused uint64_t target_threadid)
{
int error = 0;
assert(policy == PROC_POLICY_BOOST);
if (scope != PROC_POLICY_SCOPE_PROCESS) {
return EINVAL;
}
if (target_proc != current_proc()) {
return EINVAL;
}
switch (policy_subtype) {
case PROC_POLICY_IMP_IMPORTANT:
if (task_is_importance_receiver_type(target_proc->task) == FALSE) {
return EINVAL;
}
switch (action) {
case PROC_POLICY_ACTION_HOLD:
error = task_importance_hold_legacy_external_assertion(current_task(), 1);
break;
case PROC_POLICY_ACTION_DROP:
error = task_importance_drop_legacy_external_assertion(current_task(), 1);
break;
default:
error = (EINVAL);
break;
}
break;
case PROC_POLICY_IMP_DONATION:
#if CONFIG_MACF
error = mac_proc_check_sched(current_proc(), target_proc);
if (error) {
return error;
}
#endif
switch (action) {
case PROC_POLICY_ACTION_SET:
task_importance_mark_donor(target_proc->task, TRUE);
break;
default:
error = (EINVAL);
break;
}
break;
default:
error = (EINVAL);
break;
}
return error;
}
int
proc_pidbackgrounded(pid_t pid, uint32_t* state)
{
proc_t target_proc = PROC_NULL;
if (state == NULL) {
return EINVAL;
}
target_proc = proc_find(pid);
if (target_proc == PROC_NULL) {
return ESRCH;
}
if (proc_get_effective_task_policy(target_proc->task, TASK_POLICY_DARWIN_BG)) {
*state = 1;
} else {
*state = 0;
}
proc_rele(target_proc);
return 0;
}
int
proc_get_originatorbgstate(uint32_t *is_backgrounded)
{
uint32_t bgstate;
proc_t p = current_proc();
uint32_t flagsp = 0;
kern_return_t kr;
pid_t pid;
int ret;
thread_t thread = current_thread();
bgstate = proc_get_effective_thread_policy(thread, TASK_POLICY_DARWIN_BG);
if (bgstate) {
*is_backgrounded = 1;
return 0;
}
proc_get_darwinbgstate(p->task, &flagsp);
if ((flagsp & PROC_FLAG_APPLICATION) == PROC_FLAG_APPLICATION) {
*is_backgrounded = 0;
return 0;
}
kr = thread_get_current_voucher_origin_pid(&pid);
if (kr != KERN_SUCCESS) {
if (kr == KERN_INVALID_TASK) {
return ESRCH;
} else if (kr == KERN_INVALID_VALUE) {
return ENOATTR;
} else {
return EINVAL;
}
}
ret = proc_pidbackgrounded(pid, is_backgrounded);
return ret;
}
int
proc_apply_resource_actions(void * bsdinfo, __unused int type, int action)
{
proc_t p = (proc_t)bsdinfo;
switch (action) {
case PROC_POLICY_RSRCACT_THROTTLE:
break;
case PROC_POLICY_RSRCACT_SUSPEND:
task_suspend(p->task);
break;
case PROC_POLICY_RSRCACT_TERMINATE:
psignal(p, SIGKILL);
break;
case PROC_POLICY_RSRCACT_NOTIFY_KQ:
break;
case PROC_POLICY_RSRCACT_NOTIFY_EXC:
panic("shouldn't be applying exception notification to process!");
break;
}
return 0;
}
int
proc_restore_resource_actions(void * bsdinfo, __unused int type, int action)
{
proc_t p = (proc_t)bsdinfo;
switch (action) {
case PROC_POLICY_RSRCACT_THROTTLE:
case PROC_POLICY_RSRCACT_TERMINATE:
case PROC_POLICY_RSRCACT_NOTIFY_KQ:
case PROC_POLICY_RSRCACT_NOTIFY_EXC:
break;
case PROC_POLICY_RSRCACT_SUSPEND:
task_resume(p->task);
break;
}
return 0;
}