#define SIGPROP
#include <sys/param.h>
#include <sys/resourcevar.h>
#include <sys/proc_internal.h>
#include <sys/kauth.h>
#include <sys/systm.h>
#include <sys/timeb.h>
#include <sys/times.h>
#include <sys/acct.h>
#include <sys/file_internal.h>
#include <sys/kernel.h>
#include <sys/wait.h>
#include <sys/signalvar.h>
#include <sys/syslog.h>
#include <sys/stat.h>
#include <sys/lock.h>
#include <sys/kdebug.h>
#include <sys/mount.h>
#include <sys/sysproto.h>
#include <security/audit/audit.h>
#include <machine/spl.h>
#include <kern/cpu_number.h>
#include <sys/vm.h>
#include <sys/user.h>
#include <kern/ast.h>
#include <kern/task.h>
#include <kern/thread.h>
#include <kern/sched_prim.h>
#include <kern/thread_call.h>
#include <mach/exception.h>
#include <mach/task.h>
#include <mach/thread_act.h>
#include <libkern/OSAtomic.h>
#include <sys/sdt.h>
#include <sys/codesign.h>
extern int thread_enable_fpe(thread_t act, int onoff);
extern thread_t port_name_to_thread(mach_port_name_t port_name);
extern kern_return_t get_signalact(task_t , thread_t *, int);
extern unsigned int get_useraddr(void);
extern void doexception(int exc, mach_exception_code_t code,
mach_exception_subcode_t sub);
static void stop(proc_t, proc_t);
int cansignal(proc_t, kauth_cred_t, proc_t, int, int);
int killpg1(proc_t, int, int, int, int);
static void psignal_uthread(thread_t, int);
static void psignal_try_thread(proc_t, thread_t, int signum);
kern_return_t do_bsdexception(int, int, int);
void __posix_sem_syscall_return(kern_return_t);
char *proc_name_address(void *p);
kern_return_t semaphore_timedwait_signal_trap_internal(mach_port_name_t, mach_port_name_t, unsigned int, clock_res_t, void (*)(kern_return_t));
kern_return_t semaphore_timedwait_trap_internal(mach_port_name_t, unsigned int, clock_res_t, void (*)(kern_return_t));
kern_return_t semaphore_wait_signal_trap_internal(mach_port_name_t, mach_port_name_t, void (*)(kern_return_t));
kern_return_t semaphore_wait_trap_internal(mach_port_name_t, void (*)(kern_return_t));
static int filt_sigattach(struct knote *kn);
static void filt_sigdetach(struct knote *kn);
static int filt_signal(struct knote *kn, long hint);
static void filt_signaltouch(struct knote *kn, struct kevent_internal_s *kev,
long type);
struct filterops sig_filtops = {
.f_attach = filt_sigattach,
.f_detach = filt_sigdetach,
.f_event = filt_signal,
.f_touch = filt_signaltouch,
};
struct killpg1_filtargs {
int posix;
proc_t cp;
};
struct killpg1_iterargs {
proc_t cp;
kauth_cred_t uc;
int signum;
int * nfoundp;
int zombie;
};
static int killpg1_filt(proc_t p, void * arg);
static int killpg1_pgrpfilt(proc_t p, __unused void * arg);
static int killpg1_callback(proc_t p, void * arg);
static int pgsignal_filt(proc_t p, void * arg);
static int pgsignal_callback(proc_t p, void * arg);
static kern_return_t get_signalthread(proc_t, int, thread_t *);
#define PSIG_LOCKED 0x1
#define PSIG_VFORK 0x2
#define PSIG_THREAD 0x4
#define PSIG_TRY_THREAD 0x8
static void psignal_internal(proc_t p, task_t task, thread_t thread, int flavor, int signum);
static void
sigaltstack_kern_to_user32(struct kern_sigaltstack *in, struct user32_sigaltstack *out)
{
out->ss_sp = CAST_DOWN_EXPLICIT(user32_addr_t, in->ss_sp);
out->ss_size = CAST_DOWN_EXPLICIT(user32_size_t, in->ss_size);
out->ss_flags = in->ss_flags;
}
static void
sigaltstack_kern_to_user64(struct kern_sigaltstack *in, struct user64_sigaltstack *out)
{
out->ss_sp = in->ss_sp;
out->ss_size = in->ss_size;
out->ss_flags = in->ss_flags;
}
static void
sigaltstack_user32_to_kern(struct user32_sigaltstack *in, struct kern_sigaltstack *out)
{
out->ss_flags = in->ss_flags;
out->ss_size = in->ss_size;
out->ss_sp = CAST_USER_ADDR_T(in->ss_sp);
}
static void
sigaltstack_user64_to_kern(struct user64_sigaltstack *in, struct kern_sigaltstack *out)
{
out->ss_flags = in->ss_flags;
out->ss_size = in->ss_size;
out->ss_sp = in->ss_sp;
}
static void
sigaction_kern_to_user32(struct kern_sigaction *in, struct user32_sigaction *out)
{
out->__sigaction_u.__sa_handler = CAST_DOWN_EXPLICIT(user32_addr_t,in->__sigaction_u.__sa_handler);
out->sa_mask = in->sa_mask;
out->sa_flags = in->sa_flags;
}
static void
sigaction_kern_to_user64(struct kern_sigaction *in, struct user64_sigaction *out)
{
out->__sigaction_u.__sa_handler = in->__sigaction_u.__sa_handler;
out->sa_mask = in->sa_mask;
out->sa_flags = in->sa_flags;
}
static void
__sigaction_user32_to_kern(struct __user32_sigaction *in, struct __kern_sigaction *out)
{
out->__sigaction_u.__sa_handler = CAST_USER_ADDR_T(in->__sigaction_u.__sa_handler);
out->sa_tramp = CAST_USER_ADDR_T(in->sa_tramp);
out->sa_mask = in->sa_mask;
out->sa_flags = in->sa_flags;
}
static void
__sigaction_user64_to_kern(struct __user64_sigaction *in, struct __kern_sigaction *out)
{
out->__sigaction_u.__sa_handler = in->__sigaction_u.__sa_handler;
out->sa_tramp = in->sa_tramp;
out->sa_mask = in->sa_mask;
out->sa_flags = in->sa_flags;
}
#if SIGNAL_DEBUG
void ram_printf(int);
int ram_debug=0;
unsigned int rdebug_proc=0;
void
ram_printf(int x)
{
printf("x is %d",x);
}
#endif
void
signal_setast(thread_t sig_actthread)
{
act_set_astbsd(sig_actthread);
}
int
cansignal(proc_t p, kauth_cred_t uc, proc_t q, int signum, int zombie)
{
kauth_cred_t my_cred;
struct session * p_sessp = SESSION_NULL;
struct session * q_sessp = SESSION_NULL;
#if CONFIG_MACF
int error;
error = mac_proc_check_signal(p, q, signum);
if (error)
return (0);
#endif
if (p == q)
return(1);
if (signum == SIGKILL && q == initproc)
return(0);
if (!suser(uc, NULL))
return (1);
if (zombie == 0)
proc_list_lock();
if (p->p_pgrp != PGRP_NULL)
p_sessp = p->p_pgrp->pg_session;
if (q->p_pgrp != PGRP_NULL)
q_sessp = q->p_pgrp->pg_session;
if (signum == SIGCONT && q_sessp == p_sessp) {
if (zombie == 0)
proc_list_unlock();
return (1);
}
if (zombie == 0)
proc_list_unlock();
if (zombie == 0)
my_cred = kauth_cred_proc_ref(q);
else
my_cred = proc_ucred(q);
if (kauth_cred_getruid(uc) == kauth_cred_getruid(my_cred) ||
kauth_cred_getruid(uc) == kauth_cred_getsvuid(my_cred) ||
kauth_cred_getuid(uc) == kauth_cred_getruid(my_cred) ||
kauth_cred_getuid(uc) == kauth_cred_getsvuid(my_cred)) {
if (zombie == 0)
kauth_cred_unref(&my_cred);
return (1);
}
if (zombie == 0)
kauth_cred_unref(&my_cred);
return (0);
}
unsigned sigrestrict_arg = 0;
#if PLATFORM_WatchOS || PLATFORM_AppleTVOS
static int
sigrestrictmask(void)
{
if (kauth_getuid() != 0 && sigrestrict_arg != 2) {
return SIGRESTRICTMASK;
}
return 0;
}
static int
signal_is_restricted(proc_t p, int signum)
{
if (sigmask(signum) & sigrestrictmask()) {
if (sigrestrict_arg == 0 &&
task_get_apptype(p->task) == TASK_APPTYPE_APP_DEFAULT) {
return ENOTSUP;
} else {
return EINVAL;
}
}
return 0;
}
#else
static inline int
signal_is_restricted(proc_t p, int signum)
{
(void)p;
(void)signum;
return 0;
}
#endif
int
sigaction(proc_t p, struct sigaction_args *uap, __unused int32_t *retval)
{
struct kern_sigaction vec;
struct __kern_sigaction __vec;
struct kern_sigaction *sa = &vec;
struct sigacts *ps = p->p_sigacts;
int signum;
int bit, error=0;
signum = uap->signum;
if (signum <= 0 || signum >= NSIG ||
signum == SIGKILL || signum == SIGSTOP)
return (EINVAL);
if ((error = signal_is_restricted(p, signum))) {
if (error == ENOTSUP) {
printf("%s(%d): denied attempt to register action for signal %d\n",
proc_name_address(p), proc_pid(p), signum);
}
return error;
}
if (uap->osa) {
sa->sa_handler = ps->ps_sigact[signum];
sa->sa_mask = ps->ps_catchmask[signum];
bit = sigmask(signum);
sa->sa_flags = 0;
if ((ps->ps_sigonstack & bit) != 0)
sa->sa_flags |= SA_ONSTACK;
if ((ps->ps_sigintr & bit) == 0)
sa->sa_flags |= SA_RESTART;
if (ps->ps_siginfo & bit)
sa->sa_flags |= SA_SIGINFO;
if (ps->ps_signodefer & bit)
sa->sa_flags |= SA_NODEFER;
if (ps->ps_64regset & bit)
sa->sa_flags |= SA_64REGSET;
if ((signum == SIGCHLD) && (p->p_flag & P_NOCLDSTOP))
sa->sa_flags |= SA_NOCLDSTOP;
if ((signum == SIGCHLD) && (p->p_flag & P_NOCLDWAIT))
sa->sa_flags |= SA_NOCLDWAIT;
if (IS_64BIT_PROCESS(p)) {
struct user64_sigaction vec64;
sigaction_kern_to_user64(sa, &vec64);
error = copyout(&vec64, uap->osa, sizeof(vec64));
} else {
struct user32_sigaction vec32;
sigaction_kern_to_user32(sa, &vec32);
error = copyout(&vec32, uap->osa, sizeof(vec32));
}
if (error)
return (error);
}
if (uap->nsa) {
if (IS_64BIT_PROCESS(p)) {
struct __user64_sigaction __vec64;
error = copyin(uap->nsa, &__vec64, sizeof(__vec64));
__sigaction_user64_to_kern(&__vec64, &__vec);
} else {
struct __user32_sigaction __vec32;
error = copyin(uap->nsa, &__vec32, sizeof(__vec32));
__sigaction_user32_to_kern(&__vec32, &__vec);
}
if (error)
return (error);
__vec.sa_flags &= SA_USERSPACE_MASK;
error = setsigvec(p, current_thread(), signum, &__vec, FALSE);
}
return (error);
}
int
clear_procsiglist(proc_t p, int bit, boolean_t in_signalstart)
{
struct uthread * uth;
thread_t thact;
proc_lock(p);
if (!in_signalstart)
proc_signalstart(p, 1);
if ((p->p_lflag & P_LINVFORK) && p->p_vforkact) {
thact = p->p_vforkact;
uth = (struct uthread *)get_bsdthread_info(thact);
if (uth) {
uth->uu_siglist &= ~bit;
}
if (!in_signalstart)
proc_signalend(p, 1);
proc_unlock(p);
return(0);
}
TAILQ_FOREACH(uth, &p->p_uthlist, uu_list) {
uth->uu_siglist &= ~bit;
}
p->p_siglist &= ~bit;
if (!in_signalstart)
proc_signalend(p, 1);
proc_unlock(p);
return(0);
}
static int
unblock_procsigmask(proc_t p, int bit)
{
struct uthread * uth;
thread_t thact;
proc_lock(p);
proc_signalstart(p, 1);
if ((p->p_lflag & P_LINVFORK) && p->p_vforkact) {
thact = p->p_vforkact;
uth = (struct uthread *)get_bsdthread_info(thact);
if (uth) {
uth->uu_sigmask &= ~bit;
}
p->p_sigmask &= ~bit;
proc_signalend(p, 1);
proc_unlock(p);
return(0);
}
TAILQ_FOREACH(uth, &p->p_uthlist, uu_list) {
uth->uu_sigmask &= ~bit;
}
p->p_sigmask &= ~bit;
proc_signalend(p, 1);
proc_unlock(p);
return(0);
}
static int
block_procsigmask(proc_t p, int bit)
{
struct uthread * uth;
thread_t thact;
proc_lock(p);
proc_signalstart(p, 1);
if ((p->p_lflag & P_LINVFORK) && p->p_vforkact) {
thact = p->p_vforkact;
uth = (struct uthread *)get_bsdthread_info(thact);
if (uth) {
uth->uu_sigmask |= bit;
}
p->p_sigmask |= bit;
proc_signalend(p, 1);
proc_unlock(p);
return(0);
}
TAILQ_FOREACH(uth, &p->p_uthlist, uu_list) {
uth->uu_sigmask |= bit;
}
p->p_sigmask |= bit;
proc_signalend(p, 1);
proc_unlock(p);
return(0);
}
int
set_procsigmask(proc_t p, int bit)
{
struct uthread * uth;
thread_t thact;
proc_lock(p);
proc_signalstart(p, 1);
if ((p->p_lflag & P_LINVFORK) && p->p_vforkact) {
thact = p->p_vforkact;
uth = (struct uthread *)get_bsdthread_info(thact);
if (uth) {
uth->uu_sigmask = bit;
}
p->p_sigmask = bit;
proc_signalend(p, 1);
proc_unlock(p);
return(0);
}
TAILQ_FOREACH(uth, &p->p_uthlist, uu_list) {
uth->uu_sigmask = bit;
}
p->p_sigmask = bit;
proc_signalend(p, 1);
proc_unlock(p);
return(0);
}
int
setsigvec(proc_t p, __unused thread_t thread, int signum, struct __kern_sigaction *sa, boolean_t in_sigstart)
{
struct sigacts *ps = p->p_sigacts;
int bit;
if ((signum == SIGKILL || signum == SIGSTOP) &&
sa->sa_handler != SIG_DFL)
return(EINVAL);
bit = sigmask(signum);
ps->ps_sigact[signum] = sa->sa_handler;
ps->ps_trampact[signum] = sa->sa_tramp;
ps->ps_catchmask[signum] = sa->sa_mask &~ sigcantmask;
if (sa->sa_flags & SA_SIGINFO)
ps->ps_siginfo |= bit;
else
ps->ps_siginfo &= ~bit;
if (sa->sa_flags & SA_64REGSET)
ps->ps_64regset |= bit;
else
ps->ps_64regset &= ~bit;
if ((sa->sa_flags & SA_RESTART) == 0)
ps->ps_sigintr |= bit;
else
ps->ps_sigintr &= ~bit;
if (sa->sa_flags & SA_ONSTACK)
ps->ps_sigonstack |= bit;
else
ps->ps_sigonstack &= ~bit;
if (sa->sa_flags & SA_USERTRAMP)
ps->ps_usertramp |= bit;
else
ps->ps_usertramp &= ~bit;
if (sa->sa_flags & SA_RESETHAND)
ps->ps_sigreset |= bit;
else
ps->ps_sigreset &= ~bit;
if (sa->sa_flags & SA_NODEFER)
ps->ps_signodefer |= bit;
else
ps->ps_signodefer &= ~bit;
if (signum == SIGCHLD) {
if (sa->sa_flags & SA_NOCLDSTOP)
OSBitOrAtomic(P_NOCLDSTOP, &p->p_flag);
else
OSBitAndAtomic(~((uint32_t)P_NOCLDSTOP), &p->p_flag);
if ((sa->sa_flags & SA_NOCLDWAIT) || (sa->sa_handler == SIG_IGN))
OSBitOrAtomic(P_NOCLDWAIT, &p->p_flag);
else
OSBitAndAtomic(~((uint32_t)P_NOCLDWAIT), &p->p_flag);
}
if (sa->sa_handler == SIG_IGN ||
(sigprop[signum] & SA_IGNORE && sa->sa_handler == SIG_DFL)) {
clear_procsiglist(p, bit, in_sigstart);
if (signum != SIGCONT)
p->p_sigignore |= bit;
p->p_sigcatch &= ~bit;
} else {
p->p_sigignore &= ~bit;
if (sa->sa_handler == SIG_DFL)
p->p_sigcatch &= ~bit;
else
p->p_sigcatch |= bit;
}
return(0);
}
void
siginit(proc_t p)
{
int i;
for (i = 1; i < NSIG; i++)
if (sigprop[i] & SA_IGNORE && i != SIGCONT)
p->p_sigignore |= sigmask(i);
}
void
execsigs(proc_t p, thread_t thread)
{
struct sigacts *ps = p->p_sigacts;
int nc, mask;
struct uthread *ut;
ut = (struct uthread *)get_bsdthread_info(thread);
ut->uu_siglist |= p->p_siglist;
p->p_siglist = 0;
while (p->p_sigcatch) {
nc = ffs((long)p->p_sigcatch);
mask = sigmask(nc);
p->p_sigcatch &= ~mask;
if (sigprop[nc] & SA_IGNORE) {
if (nc != SIGCONT)
p->p_sigignore |= mask;
ut->uu_siglist &= ~mask;
}
ps->ps_sigact[nc] = SIG_DFL;
}
ut->uu_sigstk.ss_flags = SA_DISABLE;
ut->uu_sigstk.ss_size = 0;
ut->uu_sigstk.ss_sp = USER_ADDR_NULL;
ut->uu_flag &= ~UT_ALTSTACK;
ps->ps_sigonstack = 0;
}
int
sigprocmask(proc_t p, struct sigprocmask_args *uap, __unused int32_t *retval)
{
int error = 0;
sigset_t oldmask, nmask;
user_addr_t omask = uap->omask;
struct uthread *ut;
ut = (struct uthread *)get_bsdthread_info(current_thread());
oldmask = ut->uu_sigmask;
if (uap->mask == USER_ADDR_NULL) {
goto out;
}
error = copyin(uap->mask, &nmask, sizeof(sigset_t));
if (error)
goto out;
switch (uap->how) {
case SIG_BLOCK:
block_procsigmask(p, (nmask & ~sigcantmask));
signal_setast(current_thread());
break;
case SIG_UNBLOCK:
unblock_procsigmask(p, (nmask & ~sigcantmask));
signal_setast(current_thread());
break;
case SIG_SETMASK:
set_procsigmask(p, (nmask & ~sigcantmask));
signal_setast(current_thread());
break;
default:
error = EINVAL;
break;
}
out:
if (!error && omask != USER_ADDR_NULL)
copyout(&oldmask, omask, sizeof(sigset_t));
return (error);
}
int
sigpending(__unused proc_t p, struct sigpending_args *uap, __unused int32_t *retval)
{
struct uthread *ut;
sigset_t pendlist;
ut = (struct uthread *)get_bsdthread_info(current_thread());
pendlist = ut->uu_siglist;
if (uap->osv)
copyout(&pendlist, uap->osv, sizeof(sigset_t));
return(0);
}
static int
sigcontinue(__unused int error)
{
unix_syscall_return(EINTR);
}
int
sigsuspend(proc_t p, struct sigsuspend_args *uap, int32_t *retval)
{
__pthread_testcancel(1);
return(sigsuspend_nocancel(p, (struct sigsuspend_nocancel_args *)uap, retval));
}
int
sigsuspend_nocancel(proc_t p, struct sigsuspend_nocancel_args *uap, __unused int32_t *retval)
{
struct uthread *ut;
ut = (struct uthread *)get_bsdthread_info(current_thread());
ut->uu_oldmask = ut->uu_sigmask;
ut->uu_flag |= UT_SAS_OLDMASK;
ut->uu_sigmask = (uap->mask & ~sigcantmask);
(void) tsleep0((caddr_t) p, PPAUSE|PCATCH, "pause", 0, sigcontinue);
return (EINTR);
}
int
__disable_threadsignal(__unused proc_t p,
__unused struct __disable_threadsignal_args *uap,
__unused int32_t *retval)
{
struct uthread *uth;
uth = (struct uthread *)get_bsdthread_info(current_thread());
uth->uu_flag |= (UT_NO_SIGMASK | UT_CANCELDISABLE);
return(0);
}
void
__pthread_testcancel(int presyscall)
{
thread_t self = current_thread();
struct uthread * uthread;
uthread = (struct uthread *)get_bsdthread_info(self);
uthread->uu_flag &= ~UT_NOTCANCELPT;
if ((uthread->uu_flag & (UT_CANCELDISABLE | UT_CANCEL | UT_CANCELED)) == UT_CANCEL) {
if(presyscall != 0) {
unix_syscall_return(EINTR);
} else
thread_abort_safely(self);
}
}
int
__pthread_markcancel(__unused proc_t p,
struct __pthread_markcancel_args *uap, __unused int32_t *retval)
{
thread_act_t target_act;
int error = 0;
struct uthread *uth;
target_act = (thread_act_t)port_name_to_thread(uap->thread_port);
if (target_act == THR_ACT_NULL)
return (ESRCH);
uth = (struct uthread *)get_bsdthread_info(target_act);
if ((uth->uu_flag & (UT_VFORK | UT_CANCEL | UT_CANCELED )) == 0) {
uth->uu_flag |= (UT_CANCEL | UT_NO_SIGMASK);
if (((uth->uu_flag & UT_NOTCANCELPT) == 0)
&& ((uth->uu_flag & UT_CANCELDISABLE) == 0))
thread_abort_safely(target_act);
}
thread_deallocate(target_act);
return (error);
}
int
__pthread_canceled(__unused proc_t p,
struct __pthread_canceled_args *uap, __unused int32_t *retval)
{
thread_act_t thread;
struct uthread *uth;
int action = uap->action;
thread = current_thread();
uth = (struct uthread *)get_bsdthread_info(thread);
switch (action) {
case 1:
uth->uu_flag &= ~UT_CANCELDISABLE;
return(0);
case 2:
uth->uu_flag |= UT_CANCELDISABLE;
return(0);
case 0:
default:
if((uth->uu_flag & ( UT_CANCELDISABLE | UT_CANCEL | UT_CANCELED)) == UT_CANCEL) {
uth->uu_flag &= ~UT_CANCEL;
uth->uu_flag |= (UT_CANCELED | UT_NO_SIGMASK);
return(0);
}
return(EINVAL);
}
return(EINVAL);
}
void
__posix_sem_syscall_return(kern_return_t kern_result)
{
int error = 0;
if (kern_result == KERN_SUCCESS)
error = 0;
else if (kern_result == KERN_ABORTED)
error = EINTR;
else if (kern_result == KERN_OPERATION_TIMED_OUT)
error = ETIMEDOUT;
else
error = EINVAL;
unix_syscall_return(error);
}
#if OLD_SEMWAIT_SIGNAL
int
__old_semwait_signal(proc_t p, struct __old_semwait_signal_args *uap,
int32_t *retval)
{
__pthread_testcancel(0);
return(__old_semwait_signal_nocancel(p, (struct __old_semwait_signal_nocancel_args *)uap, retval));
}
int
__old_semwait_signal_nocancel(proc_t p, struct __old_semwait_signal_nocancel_args *uap,
__unused int32_t *retval)
{
kern_return_t kern_result;
int error;
mach_timespec_t then;
struct timespec now;
struct user_timespec ts;
boolean_t truncated_timeout = FALSE;
if(uap->timeout) {
if (IS_64BIT_PROCESS(p)) {
struct user64_timespec ts64;
error = copyin(uap->ts, &ts64, sizeof(ts64));
ts.tv_sec = ts64.tv_sec;
ts.tv_nsec = ts64.tv_nsec;
} else {
struct user32_timespec ts32;
error = copyin(uap->ts, &ts32, sizeof(ts32));
ts.tv_sec = ts32.tv_sec;
ts.tv_nsec = ts32.tv_nsec;
}
if (error) {
return error;
}
if ((ts.tv_sec & 0xFFFFFFFF00000000ULL) != 0) {
ts.tv_sec = 0xFFFFFFFF;
ts.tv_nsec = 0;
truncated_timeout = TRUE;
}
if (uap->relative) {
then.tv_sec = ts.tv_sec;
then.tv_nsec = ts.tv_nsec;
} else {
nanotime(&now);
if (now.tv_sec == ts.tv_sec ?
now.tv_nsec > ts.tv_nsec :
now.tv_sec > ts.tv_sec) {
then.tv_sec = 0;
then.tv_nsec = 0;
} else {
then.tv_sec = ts.tv_sec - now.tv_sec;
then.tv_nsec = ts.tv_nsec - now.tv_nsec;
if (then.tv_nsec < 0) {
then.tv_nsec += NSEC_PER_SEC;
then.tv_sec--;
}
}
}
if (uap->mutex_sem == 0)
kern_result = semaphore_timedwait_trap_internal((mach_port_name_t)uap->cond_sem, then.tv_sec, then.tv_nsec, __posix_sem_syscall_return);
else
kern_result = semaphore_timedwait_signal_trap_internal(uap->cond_sem, uap->mutex_sem, then.tv_sec, then.tv_nsec, __posix_sem_syscall_return);
} else {
if (uap->mutex_sem == 0)
kern_result = semaphore_wait_trap_internal(uap->cond_sem, __posix_sem_syscall_return);
else
kern_result = semaphore_wait_signal_trap_internal(uap->cond_sem, uap->mutex_sem, __posix_sem_syscall_return);
}
if (kern_result == KERN_SUCCESS && !truncated_timeout)
return(0);
else if (kern_result == KERN_SUCCESS && truncated_timeout)
return(EINTR);
else if (kern_result == KERN_ABORTED)
return(EINTR);
else if (kern_result == KERN_OPERATION_TIMED_OUT)
return(ETIMEDOUT);
else
return(EINVAL);
}
#endif
int
__semwait_signal(proc_t p, struct __semwait_signal_args *uap,
int32_t *retval)
{
__pthread_testcancel(0);
return(__semwait_signal_nocancel(p, (struct __semwait_signal_nocancel_args *)uap, retval));
}
int
__semwait_signal_nocancel(__unused proc_t p, struct __semwait_signal_nocancel_args *uap,
__unused int32_t *retval)
{
kern_return_t kern_result;
mach_timespec_t then;
struct timespec now;
struct user_timespec ts;
boolean_t truncated_timeout = FALSE;
if(uap->timeout) {
ts.tv_sec = uap->tv_sec;
ts.tv_nsec = uap->tv_nsec;
if ((ts.tv_sec & 0xFFFFFFFF00000000ULL) != 0) {
ts.tv_sec = 0xFFFFFFFF;
ts.tv_nsec = 0;
truncated_timeout = TRUE;
}
if (uap->relative) {
then.tv_sec = ts.tv_sec;
then.tv_nsec = ts.tv_nsec;
} else {
nanotime(&now);
if (now.tv_sec == ts.tv_sec ?
now.tv_nsec > ts.tv_nsec :
now.tv_sec > ts.tv_sec) {
then.tv_sec = 0;
then.tv_nsec = 0;
} else {
then.tv_sec = ts.tv_sec - now.tv_sec;
then.tv_nsec = ts.tv_nsec - now.tv_nsec;
if (then.tv_nsec < 0) {
then.tv_nsec += NSEC_PER_SEC;
then.tv_sec--;
}
}
}
if (uap->mutex_sem == 0)
kern_result = semaphore_timedwait_trap_internal((mach_port_name_t)uap->cond_sem, then.tv_sec, then.tv_nsec, __posix_sem_syscall_return);
else
kern_result = semaphore_timedwait_signal_trap_internal(uap->cond_sem, uap->mutex_sem, then.tv_sec, then.tv_nsec, __posix_sem_syscall_return);
} else {
if (uap->mutex_sem == 0)
kern_result = semaphore_wait_trap_internal(uap->cond_sem, __posix_sem_syscall_return);
else
kern_result = semaphore_wait_signal_trap_internal(uap->cond_sem, uap->mutex_sem, __posix_sem_syscall_return);
}
if (kern_result == KERN_SUCCESS && !truncated_timeout)
return(0);
else if (kern_result == KERN_SUCCESS && truncated_timeout)
return(EINTR);
else if (kern_result == KERN_ABORTED)
return(EINTR);
else if (kern_result == KERN_OPERATION_TIMED_OUT)
return(ETIMEDOUT);
else
return(EINVAL);
}
int
__pthread_kill(__unused proc_t p, struct __pthread_kill_args *uap,
__unused int32_t *retval)
{
thread_t target_act;
int error = 0;
int signum = uap->sig;
struct uthread *uth;
target_act = (thread_t)port_name_to_thread(uap->thread_port);
if (target_act == THREAD_NULL)
return (ESRCH);
if ((u_int)signum >= NSIG) {
error = EINVAL;
goto out;
}
uth = (struct uthread *)get_bsdthread_info(target_act);
if (uth->uu_flag & UT_NO_SIGMASK) {
error = ESRCH;
goto out;
}
if (signum)
psignal_uthread(target_act, signum);
out:
thread_deallocate(target_act);
return (error);
}
int
__pthread_sigmask(__unused proc_t p, struct __pthread_sigmask_args *uap,
__unused int32_t *retval)
{
user_addr_t set = uap->set;
user_addr_t oset = uap->oset;
sigset_t nset;
int error = 0;
struct uthread *ut;
sigset_t oldset;
ut = (struct uthread *)get_bsdthread_info(current_thread());
oldset = ut->uu_sigmask;
if (set == USER_ADDR_NULL) {
goto out;
}
error = copyin(set, &nset, sizeof(sigset_t));
if (error)
goto out;
switch (uap->how) {
case SIG_BLOCK:
ut->uu_sigmask |= (nset & ~sigcantmask);
break;
case SIG_UNBLOCK:
ut->uu_sigmask &= ~(nset);
signal_setast(current_thread());
break;
case SIG_SETMASK:
ut->uu_sigmask = (nset & ~sigcantmask);
signal_setast(current_thread());
break;
default:
error = EINVAL;
}
out:
if (!error && oset != USER_ADDR_NULL)
copyout(&oldset, oset, sizeof(sigset_t));
return(error);
}
int
__sigwait(proc_t p, struct __sigwait_args *uap, int32_t *retval)
{
__pthread_testcancel(1);
return(__sigwait_nocancel(p, (struct __sigwait_nocancel_args *)uap, retval));
}
int
__sigwait_nocancel(proc_t p, struct __sigwait_nocancel_args *uap, __unused int32_t *retval)
{
struct uthread *ut;
struct uthread *uth;
int error = 0;
sigset_t mask;
sigset_t siglist;
sigset_t sigw=0;
int signum;
ut = (struct uthread *)get_bsdthread_info(current_thread());
if (uap->set == USER_ADDR_NULL)
return(EINVAL);
error = copyin(uap->set, &mask, sizeof(sigset_t));
if (error)
return(error);
siglist = (mask & ~sigcantmask);
if (siglist == 0)
return(EINVAL);
proc_lock(p);
if ((p->p_lflag & P_LINVFORK) && p->p_vforkact) {
proc_unlock(p);
return(EINVAL);
} else {
proc_signalstart(p, 1);
TAILQ_FOREACH(uth, &p->p_uthlist, uu_list) {
if ( (sigw = uth->uu_siglist & siglist) ) {
break;
}
}
proc_signalend(p, 1);
}
if (sigw) {
goto sigwait1;
}
uth = ut;
ut->uu_oldmask = ut->uu_sigmask;
ut->uu_flag |= UT_SAS_OLDMASK;
if (siglist == (sigset_t)0) {
proc_unlock(p);
return(EINVAL);
}
ut->uu_sigmask = ~(siglist|sigcantmask);
ut->uu_sigwait = siglist;
error = msleep((caddr_t)&ut->uu_sigwait, &p->p_mlock, PPAUSE|PCATCH, "pause", 0);
if (error == ERESTART)
error = 0;
sigw = (ut->uu_sigwait & siglist);
ut->uu_sigmask = ut->uu_oldmask;
ut->uu_oldmask = 0;
ut->uu_flag &= ~UT_SAS_OLDMASK;
sigwait1:
ut->uu_sigwait = 0;
if (!error) {
signum = ffs((unsigned int)sigw);
if (!signum)
panic("sigwait with no signal wakeup");
uth->uu_siglist &= ~(sigmask(signum));
#if CONFIG_DTRACE
DTRACE_PROC2(signal__clear, int, signum, siginfo_t *, &(ut->t_dtrace_siginfo));
#endif
proc_unlock(p);
if (uap->sig != USER_ADDR_NULL)
error = copyout(&signum, uap->sig, sizeof(int));
} else
proc_unlock(p);
return(error);
}
int
sigaltstack(__unused proc_t p, struct sigaltstack_args *uap, __unused int32_t *retval)
{
struct kern_sigaltstack ss;
struct kern_sigaltstack *pstk;
int error;
struct uthread *uth;
int onstack;
uth = (struct uthread *)get_bsdthread_info(current_thread());
pstk = &uth->uu_sigstk;
if ((uth->uu_flag & UT_ALTSTACK) == 0)
uth->uu_sigstk.ss_flags |= SA_DISABLE;
onstack = pstk->ss_flags & SA_ONSTACK;
if (uap->oss) {
if (IS_64BIT_PROCESS(p)) {
struct user64_sigaltstack ss64;
sigaltstack_kern_to_user64(pstk, &ss64);
error = copyout(&ss64, uap->oss, sizeof(ss64));
} else {
struct user32_sigaltstack ss32;
sigaltstack_kern_to_user32(pstk, &ss32);
error = copyout(&ss32, uap->oss, sizeof(ss32));
}
if (error)
return (error);
}
if (uap->nss == USER_ADDR_NULL)
return (0);
if (IS_64BIT_PROCESS(p)) {
struct user64_sigaltstack ss64;
error = copyin(uap->nss, &ss64, sizeof(ss64));
sigaltstack_user64_to_kern(&ss64, &ss);
} else {
struct user32_sigaltstack ss32;
error = copyin(uap->nss, &ss32, sizeof(ss32));
sigaltstack_user32_to_kern(&ss32, &ss);
}
if (error)
return (error);
if ((ss.ss_flags & ~SA_DISABLE) != 0) {
return(EINVAL);
}
if (ss.ss_flags & SA_DISABLE) {
if (uth->uu_sigstk.ss_flags & SA_ONSTACK)
return (EINVAL);
uth->uu_flag &= ~UT_ALTSTACK;
uth->uu_sigstk.ss_flags = ss.ss_flags;
return (0);
}
if (onstack)
return (EPERM);
#define OLDMINSIGSTKSZ 8*1024
if (ss.ss_size < OLDMINSIGSTKSZ)
return (ENOMEM);
uth->uu_flag |= UT_ALTSTACK;
uth->uu_sigstk= ss;
return (0);
}
int
kill(proc_t cp, struct kill_args *uap, __unused int32_t *retval)
{
proc_t p;
kauth_cred_t uc = kauth_cred_get();
int posix = uap->posix;
AUDIT_ARG(pid, uap->pid);
AUDIT_ARG(signum, uap->signum);
if ((u_int)uap->signum >= NSIG)
return (EINVAL);
if (uap->pid > 0) {
if ((p = proc_find(uap->pid)) == NULL) {
if ((p = pzfind(uap->pid)) != NULL) {
return (0);
}
return (ESRCH);
}
AUDIT_ARG(process, p);
if (!cansignal(cp, uc, p, uap->signum, 0)) {
proc_rele(p);
return(EPERM);
}
if (uap->signum)
psignal(p, uap->signum);
proc_rele(p);
return (0);
}
switch (uap->pid) {
case -1:
return (killpg1(cp, uap->signum, 0, 1, posix));
case 0:
return (killpg1(cp, uap->signum, 0, 0, posix));
default:
return (killpg1(cp, uap->signum, -(uap->pid), 0, posix));
}
}
static int
killpg1_filt(proc_t p, void * arg)
{
struct killpg1_filtargs * kfargp = (struct killpg1_filtargs *)arg;
proc_t cp = kfargp->cp;
int posix = kfargp->posix;
if (p->p_pid <= 1 || p->p_flag & P_SYSTEM ||
(!posix && p == cp))
return(0);
else
return(1);
}
static int
killpg1_pgrpfilt(proc_t p, __unused void * arg)
{
if (p->p_pid <= 1 || p->p_flag & P_SYSTEM ||
(p->p_stat == SZOMB))
return(0);
else
return(1);
}
static int
killpg1_callback(proc_t p, void * arg)
{
struct killpg1_iterargs * kargp = (struct killpg1_iterargs *)arg;
proc_t cp = kargp->cp;
kauth_cred_t uc = kargp->uc;
int signum = kargp->signum;
int * nfoundp = kargp->nfoundp;
int n;
int zombie = 0;
int error = 0;
if ((kargp->zombie != 0) && ((p->p_listflag & P_LIST_EXITED) == P_LIST_EXITED))
zombie = 1;
if (zombie != 0) {
proc_list_lock();
error = cansignal(cp, uc, p, signum, zombie);
proc_list_unlock();
if (error != 0 && nfoundp != NULL) {
n = *nfoundp;
*nfoundp = n+1;
}
} else {
if (cansignal(cp, uc, p, signum, 0) == 0)
return(PROC_RETURNED);
if (nfoundp != NULL) {
n = *nfoundp;
*nfoundp = n+1;
}
if (signum != 0)
psignal(p, signum);
}
return(PROC_RETURNED);
}
int
killpg1(proc_t cp, int signum, int pgid, int all, int posix)
{
kauth_cred_t uc;
struct pgrp *pgrp;
int nfound = 0;
struct killpg1_iterargs karg;
struct killpg1_filtargs kfarg;
int error = 0;
uc = kauth_cred_proc_ref(cp);
if (all) {
kfarg.posix = posix;
kfarg.cp = cp;
karg.cp = cp;
karg.uc = uc;
karg.nfoundp = &nfound;
karg.signum = signum;
karg.zombie = 1;
proc_iterate((PROC_ALLPROCLIST | PROC_ZOMBPROCLIST), killpg1_callback, &karg, killpg1_filt, (void *)&kfarg);
} else {
if (pgid == 0) {
pgrp = proc_pgrp(cp);
} else {
pgrp = pgfind(pgid);
if (pgrp == NULL) {
error = ESRCH;
goto out;
}
}
karg.nfoundp = &nfound;
karg.uc = uc;
karg.signum = signum;
karg.cp = cp;
karg.zombie = 0;
pgrp_iterate(pgrp, PGRP_BLOCKITERATE | PGRP_DROPREF, killpg1_callback, &karg,
killpg1_pgrpfilt, NULL);
}
error = (nfound ? 0 : (posix ? EPERM : ESRCH));
out:
kauth_cred_unref(&uc);
return (error);
}
void
gsignal(int pgid, int signum)
{
struct pgrp *pgrp;
if (pgid && (pgrp = pgfind(pgid))) {
pgsignal(pgrp, signum, 0);
pg_rele(pgrp);
}
}
static int
pgsignal_filt(proc_t p, void * arg)
{
int checkctty = *(int*)arg;
if ((checkctty == 0) || p->p_flag & P_CONTROLT)
return(1);
else
return(0);
}
static int
pgsignal_callback(proc_t p, void * arg)
{
int signum = *(int*)arg;
psignal(p, signum);
return(PROC_RETURNED);
}
void
pgsignal(struct pgrp *pgrp, int signum, int checkctty)
{
if (pgrp != PGRP_NULL) {
pgrp_iterate(pgrp, PGRP_BLOCKITERATE, pgsignal_callback, &signum, pgsignal_filt, &checkctty);
}
}
void
tty_pgsignal(struct tty *tp, int signum, int checkctty)
{
struct pgrp * pg;
pg = tty_pgrp(tp);
if (pg != PGRP_NULL) {
pgrp_iterate(pg, PGRP_BLOCKITERATE, pgsignal_callback, &signum, pgsignal_filt, &checkctty);
pg_rele(pg);
}
}
void
threadsignal(thread_t sig_actthread, int signum, mach_exception_code_t code)
{
struct uthread *uth;
struct task * sig_task;
proc_t p;
int mask;
if ((u_int)signum >= NSIG || signum == 0)
return;
mask = sigmask(signum);
if ((mask & threadmask) == 0)
return;
sig_task = get_threadtask(sig_actthread);
p = (proc_t)(get_bsdtask_info(sig_task));
uth = get_bsdthread_info(sig_actthread);
if (uth->uu_flag & UT_VFORK)
p = uth->uu_proc;
proc_lock(p);
if (!(p->p_lflag & P_LTRACED) && (p->p_sigignore & mask)) {
proc_unlock(p);
return;
}
uth->uu_siglist |= mask;
uth->uu_code = code;
proc_unlock(p);
signal_setast(sig_actthread);
}
static kern_return_t
get_signalthread(proc_t p, int signum, thread_t * thr)
{
struct uthread *uth;
sigset_t mask = sigmask(signum);
thread_t sig_thread;
struct task * sig_task = p->task;
kern_return_t kret;
*thr = THREAD_NULL;
if ((p->p_lflag & P_LINVFORK) && p->p_vforkact) {
sig_thread = p->p_vforkact;
kret = check_actforsig(sig_task, sig_thread, 1);
if (kret == KERN_SUCCESS) {
*thr = sig_thread;
return(KERN_SUCCESS);
}else
return(KERN_FAILURE);
}
proc_lock(p);
TAILQ_FOREACH(uth, &p->p_uthlist, uu_list) {
if(((uth->uu_flag & UT_NO_SIGMASK)== 0) &&
(((uth->uu_sigmask & mask) == 0) || (uth->uu_sigwait & mask))) {
if (check_actforsig(p->task, uth->uu_context.vc_thread, 1) == KERN_SUCCESS) {
*thr = uth->uu_context.vc_thread;
proc_unlock(p);
return(KERN_SUCCESS);
}
}
}
proc_unlock(p);
if (get_signalact(p->task, thr, 1) == KERN_SUCCESS) {
return(KERN_SUCCESS);
}
return(KERN_FAILURE);
}
static void
psignal_internal(proc_t p, task_t task, thread_t thread, int flavor, int signum)
{
int prop;
user_addr_t action = USER_ADDR_NULL;
proc_t sig_proc;
thread_t sig_thread;
register task_t sig_task;
int mask;
struct uthread *uth;
kern_return_t kret;
uid_t r_uid;
proc_t pp;
kauth_cred_t my_cred;
if ((u_int)signum >= NSIG || signum == 0)
panic("psignal signal number");
mask = sigmask(signum);
prop = sigprop[signum];
#if SIGNAL_DEBUG
if(rdebug_proc && (p != PROC_NULL) && (p == rdebug_proc)) {
ram_printf(3);
}
#endif
if (signum == SIGKILL && p == initproc)
panic_plain("unexpected SIGKILL of %s %s",
(p->p_name[0] != '\0' ? p->p_name : "initproc"),
((p->p_csflags & CS_KILLED) ? "(CS_KILLED)" : ""));
if (flavor & PSIG_VFORK) {
sig_task = task;
sig_thread = thread;
sig_proc = p;
} else if (flavor & PSIG_THREAD) {
sig_task = get_threadtask(thread);
sig_thread = thread;
sig_proc = (proc_t)get_bsdtask_info(sig_task);
} else if (flavor & PSIG_TRY_THREAD) {
sig_task = p->task;
sig_thread = thread;
sig_proc = p;
} else {
sig_task = p->task;
sig_thread = (struct thread *)0;
sig_proc = p;
}
if ((sig_task == TASK_NULL) || is_kerneltask(sig_task))
return;
if (ISSET(sig_proc->p_flag, P_REBOOT) ||
ISSET(sig_proc->p_lflag, P_LEXIT))
return;
if( (flavor & (PSIG_VFORK | PSIG_THREAD)) == 0) {
proc_knote(sig_proc, NOTE_SIGNAL | signum);
}
if ((flavor & PSIG_LOCKED)== 0)
proc_signalstart(sig_proc, 0);
if (((flavor & PSIG_VFORK) == 0) && ((sig_proc->p_lflag & P_LTRACED) == 0) && (sig_proc->p_sigignore & mask)) {
DTRACE_PROC3(signal__discard, thread_t, sig_thread, proc_t, sig_proc, int, signum);
goto psigout;
}
if (flavor & PSIG_VFORK) {
action = SIG_DFL;
act_set_astbsd(sig_thread);
kret = KERN_SUCCESS;
} else if (flavor & PSIG_TRY_THREAD) {
uth = get_bsdthread_info(sig_thread);
if (((uth->uu_flag & UT_NO_SIGMASK) == 0) &&
(((uth->uu_sigmask & mask) == 0) || (uth->uu_sigwait & mask)) &&
((kret = check_actforsig(sig_proc->task, sig_thread, 1)) == KERN_SUCCESS)) {
} else {
kret = get_signalthread(sig_proc, signum, &sig_thread);
}
} else if (flavor & PSIG_THREAD) {
kret = check_actforsig(sig_task, sig_thread, 1);
} else {
kret = get_signalthread(sig_proc, signum, &sig_thread);
}
if (kret != KERN_SUCCESS) {
#if SIGNAL_DEBUG
ram_printf(1);
#endif
goto psigout;
}
uth = get_bsdthread_info(sig_thread);
if ((flavor & PSIG_VFORK) == 0) {
if (sig_proc->p_lflag & P_LTRACED)
action = SIG_DFL;
else {
if (sig_proc->p_sigignore & mask)
goto psigout;
if (uth->uu_sigwait & mask)
action = KERN_SIG_WAIT;
else if (uth->uu_sigmask & mask)
action = KERN_SIG_HOLD;
else if (sig_proc->p_sigcatch & mask)
action = KERN_SIG_CATCH;
else
action = SIG_DFL;
}
}
proc_lock(sig_proc);
if (sig_proc->p_nice > NZERO && action == SIG_DFL && (prop & SA_KILL) &&
(sig_proc->p_lflag & P_LTRACED) == 0)
sig_proc->p_nice = NZERO;
if (prop & SA_CONT)
uth->uu_siglist &= ~stopsigmask;
if (prop & SA_STOP) {
struct pgrp *pg;
proc_unlock(sig_proc);
pg = proc_pgrp(sig_proc);
if (prop & SA_TTYSTOP && pg->pg_jobc == 0 &&
action == SIG_DFL) {
pg_rele(pg);
goto psigout;
}
pg_rele(pg);
proc_lock(sig_proc);
uth->uu_siglist &= ~contsigmask;
}
uth->uu_siglist |= mask;
if (action == KERN_SIG_CATCH)
act_set_astbsd(sig_thread);
if ((action == KERN_SIG_HOLD) && ((prop & SA_CONT) == 0 || sig_proc->p_stat != SSTOP)) {
proc_unlock(sig_proc);
goto psigout;
}
if ((signum == SIGKILL) && (sig_proc->p_nice > NZERO)) {
sig_proc->p_nice = NZERO;
}
if (sig_proc->p_lflag & P_LTRACED) {
if (sig_proc->p_stat != SSTOP)
goto runlocked;
else {
proc_unlock(sig_proc);
goto psigout;
}
}
if ((flavor & PSIG_VFORK) != 0)
goto runlocked;
if (action == KERN_SIG_WAIT) {
#if CONFIG_DTRACE
r_uid = kauth_getruid();
bzero((caddr_t)&(uth->t_dtrace_siginfo), sizeof(uth->t_dtrace_siginfo));
uth->t_dtrace_siginfo.si_signo = signum;
uth->t_dtrace_siginfo.si_pid = current_proc()->p_pid;
uth->t_dtrace_siginfo.si_status = W_EXITCODE(signum, 0);
uth->t_dtrace_siginfo.si_uid = r_uid;
uth->t_dtrace_siginfo.si_code = 0;
#endif
uth->uu_sigwait = mask;
uth->uu_siglist &= ~mask;
wakeup(&uth->uu_sigwait);
if (prop & SA_CONT) {
OSBitOrAtomic(P_CONTINUED, &sig_proc->p_flag);
sig_proc->p_contproc = current_proc()->p_pid;
proc_unlock(sig_proc);
(void) task_resume_internal(sig_task);
goto psigout;
}
proc_unlock(sig_proc);
goto psigout;
}
if (action != SIG_DFL) {
if (prop & SA_CONT) {
OSBitOrAtomic(P_CONTINUED, &sig_proc->p_flag);
proc_unlock(sig_proc);
(void) task_resume_internal(sig_task);
proc_lock(sig_proc);
sig_proc->p_stat = SRUN;
} else if (sig_proc->p_stat == SSTOP) {
proc_unlock(sig_proc);
goto psigout;
}
if (signum != SIGCHLD) {
proc_unlock(sig_proc);
r_uid = kauth_getruid();
proc_lock(sig_proc);
sig_proc->si_pid = current_proc()->p_pid;
sig_proc->si_status = W_EXITCODE(signum, 0);
sig_proc->si_uid = r_uid;
sig_proc->si_code = 0;
}
goto runlocked;
} else {
if (mask & stopsigmask) {
if (!(prop & SA_STOP) && sig_proc->p_pptr == initproc) {
proc_unlock(sig_proc);
psignal_locked(sig_proc, SIGKILL);
proc_lock(sig_proc);
uth->uu_siglist &= ~mask;
proc_unlock(sig_proc);
goto psigout;
}
uth->uu_siglist &= ~mask;
if (sig_proc->p_stat != SSTOP) {
sig_proc->p_xstat = signum;
sig_proc->p_stat = SSTOP;
OSBitAndAtomic(~((uint32_t)P_CONTINUED), &sig_proc->p_flag);
sig_proc->p_lflag &= ~P_LWAITED;
proc_unlock(sig_proc);
pp = proc_parentholdref(sig_proc);
stop(sig_proc, pp);
if (( pp != PROC_NULL) && ((pp->p_flag & P_NOCLDSTOP) == 0)) {
my_cred = kauth_cred_proc_ref(sig_proc);
r_uid = kauth_cred_getruid(my_cred);
kauth_cred_unref(&my_cred);
proc_lock(sig_proc);
pp->si_pid = sig_proc->p_pid;
if (signum != SIGSTOP)
pp->si_status = WEXITSTATUS(sig_proc->p_xstat);
else
pp->si_status = W_EXITCODE(signum, signum);
pp->si_code = CLD_STOPPED;
pp->si_uid = r_uid;
proc_unlock(sig_proc);
psignal(pp, SIGCHLD);
}
if (pp != PROC_NULL)
proc_parentdropref(pp, 0);
} else
proc_unlock(sig_proc);
goto psigout;
}
DTRACE_PROC3(signal__send, thread_t, sig_thread, proc_t, p, int, signum);
switch (signum) {
case SIGKILL:
sig_proc->p_stat = SRUN;
act_set_astbsd(sig_thread);
thread_abort(sig_thread);
proc_unlock(sig_proc);
goto psigout;
case SIGCONT:
OSBitOrAtomic(P_CONTINUED, &sig_proc->p_flag);
sig_proc->p_contproc = sig_proc->p_pid;
proc_unlock(sig_proc);
(void) task_resume_internal(sig_task);
proc_lock(sig_proc);
if (((flavor & (PSIG_VFORK|PSIG_THREAD)) == 0) && (((uth->uu_siglist & ~uth->uu_sigmask) & ~sig_proc->p_sigignore) & ~mask)) {
uth->uu_siglist &= ~mask;
sig_proc->p_stat = SRUN;
goto runlocked;
}
uth->uu_siglist &= ~mask;
sig_proc->p_stat = SRUN;
proc_unlock(sig_proc);
goto psigout;
default:
if (((flavor & (PSIG_VFORK|PSIG_THREAD)) == 0) && (action == SIG_DFL) && (prop & SA_KILL)) {
sig_proc->p_stat = SRUN;
proc_unlock(sig_proc);
thread_abort(sig_thread);
goto psigout;
}
if (sig_proc->p_stat == SSTOP) {
proc_unlock(sig_proc);
goto psigout;
}
goto runlocked;
}
}
runlocked:
if (sig_proc->p_stat == SSTOP) {
if ((sig_proc->p_lflag & P_LTRACED) != 0 && sig_proc->p_xstat != 0)
uth->uu_siglist |= sigmask(sig_proc->p_xstat);
if ((flavor & PSIG_VFORK) != 0) {
sig_proc->p_stat = SRUN;
}
proc_unlock(sig_proc);
} else {
sig_proc->p_stat = SRUN;
proc_unlock(sig_proc);
if ((flavor & PSIG_VFORK) == 0)
thread_abort_safely(sig_thread);
}
psigout:
if ((flavor & PSIG_LOCKED)== 0) {
proc_signalend(sig_proc, 0);
}
}
void
psignal(proc_t p, int signum)
{
psignal_internal(p, NULL, NULL, 0, signum);
}
void
psignal_locked(proc_t p, int signum)
{
psignal_internal(p, NULL, NULL, PSIG_LOCKED, signum);
}
void
psignal_vfork(proc_t p, task_t new_task, thread_t thread, int signum)
{
psignal_internal(p, new_task, thread, PSIG_VFORK, signum);
}
static void
psignal_uthread(thread_t thread, int signum)
{
psignal_internal(PROC_NULL, TASK_NULL, thread, PSIG_THREAD, signum);
}
static void
psignal_try_thread(proc_t p, thread_t thread, int signum)
{
psignal_internal(p, NULL, thread, PSIG_TRY_THREAD, signum);
}
int
issignal_locked(proc_t p)
{
int signum, mask, prop, sigbits;
thread_t cur_act;
struct uthread * ut;
proc_t pp;
kauth_cred_t my_cred;
int retval = 0;
uid_t r_uid;
cur_act = current_thread();
#if SIGNAL_DEBUG
if(rdebug_proc && (p == rdebug_proc)) {
ram_printf(3);
}
#endif
if (sig_try_locked(p) <= 0) {
return(0);
}
proc_signalstart(p, 1);
ut = get_bsdthread_info(cur_act);
for(;;) {
sigbits = ut->uu_siglist & ~ut->uu_sigmask;
if (p->p_lflag & P_LPPWAIT)
sigbits &= ~stopsigmask;
if (sigbits == 0) {
retval = 0;
goto out;
}
signum = ffs((long)sigbits);
mask = sigmask(signum);
prop = sigprop[signum];
if (mask & p->p_sigignore && (p->p_lflag & P_LTRACED) == 0) {
ut->uu_siglist &= ~mask;
continue;
}
if (p->p_lflag & P_LTRACED && (p->p_lflag & P_LPPWAIT) == 0) {
task_t task;
p->p_xstat = signum;
if (p->p_lflag & P_LSIGEXC) {
p->sigwait = TRUE;
p->sigwait_thread = cur_act;
p->p_stat = SSTOP;
OSBitAndAtomic(~((uint32_t)P_CONTINUED), &p->p_flag);
p->p_lflag &= ~P_LWAITED;
ut->uu_siglist &= ~mask;
proc_signalend(p, 1);
proc_unlock(p);
do_bsdexception(EXC_SOFTWARE, EXC_SOFT_SIGNAL, signum);
proc_lock(p);
proc_signalstart(p, 1);
} else {
proc_unlock(p);
my_cred = kauth_cred_proc_ref(p);
r_uid = kauth_cred_getruid(my_cred);
kauth_cred_unref(&my_cred);
pp = proc_parentholdref(p);
if (pp != PROC_NULL) {
proc_lock(pp);
pp->si_pid = p->p_pid;
pp->si_status = p->p_xstat;
pp->si_code = CLD_TRAPPED;
pp->si_uid = r_uid;
proc_unlock(pp);
}
task = p->task;
task_suspend_internal(task);
proc_lock(p);
p->sigwait = TRUE;
p->sigwait_thread = cur_act;
p->p_stat = SSTOP;
OSBitAndAtomic(~((uint32_t)P_CONTINUED), &p->p_flag);
p->p_lflag &= ~P_LWAITED;
ut->uu_siglist &= ~mask;
proc_signalend(p, 1);
proc_unlock(p);
if (pp != PROC_NULL) {
psignal(pp, SIGCHLD);
proc_list_lock();
wakeup((caddr_t)pp);
proc_parentdropref(pp, 1);
proc_list_unlock();
}
assert_wait((caddr_t)&p->sigwait, (THREAD_INTERRUPTIBLE));
thread_block(THREAD_CONTINUE_NULL);
proc_lock(p);
proc_signalstart(p, 1);
}
p->sigwait = FALSE;
p->sigwait_thread = NULL;
wakeup((caddr_t)&p->sigwait_thread);
if (ut->uu_siglist & sigmask(SIGKILL)) {
clear_wait(current_thread(), THREAD_INTERRUPTED);
sig_lock_to_exit(p);
proc_signalend(p, 1);
proc_unlock(p);
KERNEL_DEBUG_CONSTANT(BSDDBG_CODE(DBG_BSD_PROC, BSD_PROC_FRCEXIT) | DBG_FUNC_NONE,
p->p_pid, W_EXITCODE(0, SIGKILL), 2, 0, 0);
exit1(p, W_EXITCODE(0, SIGKILL), (int *)NULL);
proc_lock(p);
return(0);
}
if (thread_should_abort(current_thread())) {
retval = 0;
goto out;
}
signum = p->p_xstat;
if (signum == 0)
continue;
mask = sigmask(signum);
ut->uu_siglist |= mask;
if (ut->uu_sigmask & mask)
continue;
}
switch ((long)p->p_sigacts->ps_sigact[signum]) {
case (long)SIG_DFL:
if (prop & SA_STOP) {
struct pgrp * pg;
proc_unlock(p);
pg = proc_pgrp(p);
if (p->p_lflag & P_LTRACED ||
(pg->pg_jobc == 0 &&
prop & SA_TTYSTOP)) {
proc_lock(p);
pg_rele(pg);
break;
}
pg_rele(pg);
if (p->p_stat != SSTOP) {
proc_lock(p);
p->p_xstat = signum;
p->p_stat = SSTOP;
p->p_lflag &= ~P_LWAITED;
proc_unlock(p);
pp = proc_parentholdref(p);
stop(p, pp);
if ((pp != PROC_NULL) && ((pp->p_flag & P_NOCLDSTOP) == 0)) {
my_cred = kauth_cred_proc_ref(p);
r_uid = kauth_cred_getruid(my_cred);
kauth_cred_unref(&my_cred);
proc_lock(pp);
pp->si_pid = p->p_pid;
pp->si_status = WEXITSTATUS(p->p_xstat);
pp->si_code = CLD_STOPPED;
pp->si_uid = r_uid;
proc_unlock(pp);
psignal(pp, SIGCHLD);
}
if (pp != PROC_NULL)
proc_parentdropref(pp, 0);
}
proc_lock(p);
break;
} else if (prop & SA_IGNORE) {
break;
} else {
ut->uu_siglist &= ~mask;
retval = signum;
goto out;
}
break;
case (long)SIG_IGN:
if ((prop & SA_CONT) == 0 &&
(p->p_lflag & P_LTRACED) == 0)
printf("issignal\n");
break;
default:
ut->uu_siglist &= ~mask;
retval = signum;
goto out;
}
ut->uu_siglist &= ~mask;
}
out:
proc_signalend(p, 1);
return(retval);
}
int
CURSIG(proc_t p)
{
int signum, mask, prop, sigbits;
thread_t cur_act;
struct uthread * ut;
int retnum = 0;
cur_act = current_thread();
ut = get_bsdthread_info(cur_act);
if (ut->uu_siglist == 0)
return (0);
if (((ut->uu_siglist & ~ut->uu_sigmask) == 0) && ((p->p_lflag & P_LTRACED) == 0))
return (0);
sigbits = ut->uu_siglist & ~ut->uu_sigmask;
for(;;) {
if (p->p_lflag & P_LPPWAIT)
sigbits &= ~stopsigmask;
if (sigbits == 0) {
return (retnum);
}
signum = ffs((long)sigbits);
mask = sigmask(signum);
prop = sigprop[signum];
sigbits &= ~mask;
if (mask & p->p_sigignore && (p->p_lflag & P_LTRACED) == 0) {
continue;
}
if (p->p_lflag & P_LTRACED && (p->p_lflag & P_LPPWAIT) == 0) {
return(signum);
}
switch ((long)p->p_sigacts->ps_sigact[signum]) {
case (long)SIG_DFL:
if (prop & SA_STOP) {
struct pgrp *pg;
pg = proc_pgrp(p);
if (p->p_lflag & P_LTRACED ||
(pg->pg_jobc == 0 &&
prop & SA_TTYSTOP)) {
pg_rele(pg);
break;
}
pg_rele(pg);
retnum = signum;
break;
} else if (prop & SA_IGNORE) {
break;
} else {
return (signum);
}
case (long)SIG_IGN:
if ((prop & SA_CONT) == 0 &&
(p->p_lflag & P_LTRACED) == 0)
printf("issignal\n");
break;
default:
return (signum);
}
}
}
static void
stop(proc_t p, proc_t parent)
{
OSBitAndAtomic(~((uint32_t)P_CONTINUED), &p->p_flag);
if ((parent != PROC_NULL) && (parent->p_stat != SSTOP)) {
proc_list_lock();
wakeup((caddr_t)parent);
proc_list_unlock();
}
(void) task_suspend_internal(p->task);
}
void
postsig_locked(int signum)
{
proc_t p = current_proc();
struct sigacts *ps = p->p_sigacts;
user_addr_t catcher;
uint32_t code;
int mask, returnmask;
struct uthread * ut;
#if DIAGNOSTIC
if (signum == 0)
panic("postsig");
if (cpu_number() != master_cpu)
panic("psig not on master");
#endif
if (sig_try_locked(p) <= 0) {
return;
}
proc_signalstart(p, 1);
ut = (struct uthread *)get_bsdthread_info(current_thread());
mask = sigmask(signum);
ut->uu_siglist &= ~mask;
catcher = ps->ps_sigact[signum];
if (catcher == SIG_DFL) {
sig_lock_to_exit(p);
p->p_acflag |= AXSIG;
if (sigprop[signum] & SA_CORE) {
p->p_sigacts->ps_sig = signum;
proc_signalend(p, 1);
proc_unlock(p);
if (coredump(p, 0, 0) == 0)
signum |= WCOREFLAG;
} else {
proc_signalend(p, 1);
proc_unlock(p);
}
#if CONFIG_DTRACE
bzero((caddr_t)&(ut->t_dtrace_siginfo), sizeof(ut->t_dtrace_siginfo));
ut->t_dtrace_siginfo.si_signo = signum;
ut->t_dtrace_siginfo.si_pid = p->si_pid;
ut->t_dtrace_siginfo.si_uid = p->si_uid;
ut->t_dtrace_siginfo.si_status = WEXITSTATUS(p->si_status);
switch (signum) {
case SIGILL: case SIGBUS: case SIGSEGV: case SIGFPE: case SIGTRAP:
DTRACE_PROC2(fault, int, (int)(ut->uu_code), siginfo_t *, &(ut->t_dtrace_siginfo));
break;
default:
break;
}
DTRACE_PROC3(signal__handle, int, signum, siginfo_t *, &(ut->t_dtrace_siginfo),
void (*)(void), SIG_DFL);
#endif
KERNEL_DEBUG_CONSTANT(BSDDBG_CODE(DBG_BSD_PROC, BSD_PROC_FRCEXIT) | DBG_FUNC_NONE,
p->p_pid, W_EXITCODE(0, signum), 3, 0, 0);
exit1(p, W_EXITCODE(0, signum), (int *)NULL);
proc_lock(p);
return;
} else {
#if DIAGNOSTIC
if (catcher == SIG_IGN || (ut->uu_sigmask & mask))
log(LOG_WARNING,
"postsig: processing masked or ignored signal\n");
#endif
if (ut->uu_flag & UT_SAS_OLDMASK) {
returnmask = ut->uu_oldmask;
ut->uu_flag &= ~UT_SAS_OLDMASK;
ut->uu_oldmask = 0;
} else
returnmask = ut->uu_sigmask;
ut->uu_sigmask |= ps->ps_catchmask[signum];
if ((ps->ps_signodefer & mask) == 0)
ut->uu_sigmask |= mask;
if ((signum != SIGILL) && (signum != SIGTRAP) && (ps->ps_sigreset & mask)) {
if ((signum != SIGCONT) && (sigprop[signum] & SA_IGNORE))
p->p_sigignore |= mask;
ps->ps_sigact[signum] = SIG_DFL;
ps->ps_siginfo &= ~mask;
ps->ps_signodefer &= ~mask;
}
if (ps->ps_sig != signum) {
code = 0;
} else {
code = ps->ps_code;
ps->ps_code = 0;
}
OSIncrementAtomicLong(&p->p_stats->p_ru.ru_nsignals);
sendsig(p, catcher, signum, returnmask, code);
}
proc_signalend(p, 1);
}
static int
filt_sigattach(struct knote *kn)
{
proc_t p = current_proc();
proc_klist_lock();
kn->kn_ptr.p_proc = p;
kn->kn_flags |= EV_CLEAR;
KNOTE_ATTACH(&p->p_klist, kn);
proc_klist_unlock();
return (0);
}
static void
filt_sigdetach(struct knote *kn)
{
proc_t p = kn->kn_ptr.p_proc;
proc_klist_lock();
kn->kn_ptr.p_proc = NULL;
KNOTE_DETACH(&p->p_klist, kn);
proc_klist_unlock();
}
static int
filt_signal(struct knote *kn, long hint)
{
if (hint & NOTE_SIGNAL) {
hint &= ~NOTE_SIGNAL;
if (kn->kn_id == (unsigned int)hint)
kn->kn_data++;
} else if (hint & NOTE_EXIT) {
panic("filt_signal: detected NOTE_EXIT event");
}
return (kn->kn_data != 0);
}
static void
filt_signaltouch(struct knote *kn, struct kevent_internal_s *kev, long type)
{
proc_klist_lock();
switch (type) {
case EVENT_REGISTER:
kn->kn_sfflags = kev->fflags;
kn->kn_sdata = kev->data;
break;
case EVENT_PROCESS:
*kev = kn->kn_kevent;
if (kn->kn_flags & EV_CLEAR) {
kn->kn_data = 0;
kn->kn_fflags = 0;
}
break;
default:
panic("filt_signaltouch() - invalid type (%ld)", type);
break;
}
proc_klist_unlock();
}
void
bsd_ast(thread_t thread)
{
proc_t p = current_proc();
struct uthread *ut = get_bsdthread_info(thread);
int signum;
user_addr_t pc;
static int bsd_init_done = 0;
if (p == NULL)
return;
if ((p->p_flag & P_OWEUPC) && (p->p_flag & P_PROFIL)) {
pc = get_useraddr();
addupc_task(p, pc, 1);
OSBitAndAtomic(~((uint32_t)P_OWEUPC), &p->p_flag);
}
if (timerisset(&p->p_vtimer_user.it_value)) {
uint32_t microsecs;
task_vtimer_update(p->task, TASK_VTIMER_USER, µsecs);
if (!itimerdecr(p, &p->p_vtimer_user, microsecs)) {
if (timerisset(&p->p_vtimer_user.it_value))
task_vtimer_set(p->task, TASK_VTIMER_USER);
else
task_vtimer_clear(p->task, TASK_VTIMER_USER);
psignal_try_thread(p, thread, SIGVTALRM);
}
}
if (timerisset(&p->p_vtimer_prof.it_value)) {
uint32_t microsecs;
task_vtimer_update(p->task, TASK_VTIMER_PROF, µsecs);
if (!itimerdecr(p, &p->p_vtimer_prof, microsecs)) {
if (timerisset(&p->p_vtimer_prof.it_value))
task_vtimer_set(p->task, TASK_VTIMER_PROF);
else
task_vtimer_clear(p->task, TASK_VTIMER_PROF);
psignal_try_thread(p, thread, SIGPROF);
}
}
if (timerisset(&p->p_rlim_cpu)) {
struct timeval tv;
task_vtimer_update(p->task, TASK_VTIMER_RLIM, (uint32_t *) &tv.tv_usec);
proc_spinlock(p);
if (p->p_rlim_cpu.tv_sec > 0 || p->p_rlim_cpu.tv_usec > tv.tv_usec) {
tv.tv_sec = 0;
timersub(&p->p_rlim_cpu, &tv, &p->p_rlim_cpu);
proc_spinunlock(p);
} else {
timerclear(&p->p_rlim_cpu);
proc_spinunlock(p);
task_vtimer_clear(p->task, TASK_VTIMER_RLIM);
psignal_try_thread(p, thread, SIGXCPU);
}
}
#if CONFIG_DTRACE
if (ut->t_dtrace_sig) {
uint8_t dt_action_sig = ut->t_dtrace_sig;
ut->t_dtrace_sig = 0;
psignal(p, dt_action_sig);
}
if (ut->t_dtrace_stop) {
ut->t_dtrace_stop = 0;
proc_lock(p);
p->p_dtrace_stop = 1;
proc_unlock(p);
(void)task_suspend_internal(p->task);
}
if (ut->t_dtrace_resumepid) {
proc_t resumeproc = proc_find(ut->t_dtrace_resumepid);
ut->t_dtrace_resumepid = 0;
if (resumeproc != PROC_NULL) {
proc_lock(resumeproc);
if (resumeproc->p_dtrace_stop) {
resumeproc->p_dtrace_stop = 0;
proc_unlock(resumeproc);
task_resume_internal(resumeproc->task);
}
else {
proc_unlock(resumeproc);
}
proc_rele(resumeproc);
}
}
#endif
proc_lock(p);
if (CHECK_SIGNALS(p, current_thread(), ut)) {
while ( (signum = issignal_locked(p)) )
postsig_locked(signum);
}
proc_unlock(p);
if (!bsd_init_done) {
bsd_init_done = 1;
bsdinit_task();
}
}
void
pt_setrunnable(proc_t p)
{
task_t task;
task = p->task;
if (p->p_lflag & P_LTRACED) {
proc_lock(p);
p->p_stat = SRUN;
proc_unlock(p);
if (p->sigwait) {
wakeup((caddr_t)&(p->sigwait));
if ((p->p_lflag & P_LSIGEXC) == 0) { task_release(task);
}
}
}
}
kern_return_t
do_bsdexception(
int exc,
int code,
int sub)
{
mach_exception_data_type_t codes[EXCEPTION_CODE_MAX];
codes[0] = code;
codes[1] = sub;
return(bsd_exception(exc, codes, 2));
}
int
proc_pendingsignals(proc_t p, sigset_t mask)
{
struct uthread * uth;
thread_t th;
sigset_t bits = 0;
proc_lock(p);
if (p->p_lflag & P_LPEXIT) {
goto out;
}
if ((p->p_lflag & P_LINVFORK) && p->p_vforkact) {
th = p->p_vforkact;
uth = (struct uthread *)get_bsdthread_info(th);
if (uth) {
bits = (((uth->uu_siglist & ~uth->uu_sigmask) & ~p->p_sigignore) & mask);
}
goto out;
}
bits = 0;
TAILQ_FOREACH(uth, &p->p_uthlist, uu_list) {
bits |= (((uth->uu_siglist & ~uth->uu_sigmask) & ~p->p_sigignore) & mask);
}
out:
proc_unlock(p);
return(bits);
}
int
thread_issignal(proc_t p, thread_t th, sigset_t mask)
{
struct uthread * uth;
sigset_t bits=0;
proc_lock(p);
uth = (struct uthread *)get_bsdthread_info(th);
if (uth) {
bits = (((uth->uu_siglist & ~uth->uu_sigmask) & ~p->p_sigignore) & mask);
}
proc_unlock(p);
return(bits);
}
int
hassigprop(int sig, int prop)
{
return (sigprop[sig] & prop);
}
void
pgsigio(pid_t pgid, int sig)
{
proc_t p = PROC_NULL;
if (pgid < 0)
gsignal(-(pgid), sig);
else if (pgid > 0 && (p = proc_find(pgid)) != 0)
psignal(p, sig);
if (p != PROC_NULL)
proc_rele(p);
}
void
proc_signalstart(proc_t p, int locked)
{
if (!locked)
proc_lock(p);
if(p->p_signalholder == current_thread())
panic("proc_signalstart: thread attempting to signal a process for which it holds the signal lock");
p->p_sigwaitcnt++;
while ((p->p_lflag & P_LINSIGNAL) == P_LINSIGNAL)
msleep(&p->p_sigmask, &p->p_mlock, 0, "proc_signstart", NULL);
p->p_sigwaitcnt--;
p->p_lflag |= P_LINSIGNAL;
p->p_signalholder = current_thread();
if (!locked)
proc_unlock(p);
}
void
proc_signalend(proc_t p, int locked)
{
if (!locked)
proc_lock(p);
p->p_lflag &= ~P_LINSIGNAL;
if (p->p_sigwaitcnt > 0)
wakeup(&p->p_sigmask);
p->p_signalholder = NULL;
if (!locked)
proc_unlock(p);
}
void
sig_lock_to_exit(proc_t p)
{
thread_t self = current_thread();
p->exit_thread = self;
proc_unlock(p);
task_hold(p->task);
task_wait(p->task, FALSE);
proc_lock(p);
}
int
sig_try_locked(proc_t p)
{
thread_t self = current_thread();
while (p->sigwait || p->exit_thread) {
if (p->exit_thread) {
return(0);
}
msleep((caddr_t)&p->sigwait_thread, &p->p_mlock, PCATCH | PDROP, 0, 0);
if (thread_should_abort(self)) {
proc_lock(p);
return -1;
}
proc_lock(p);
}
return 1;
}