linux-master/kernel/signal.c

257 				current->comm, current->pid, sig);
834 	struct pid *sid;
1218 	/* Should SIGKILL or SIGSTOP be received by a pid namespace init? */
1222 		/* Force if sent from an ancestor pid namespace */
1242 		/* From an ancestor pid namespace? */
1461 int __kill_pgrp_info(int sig, struct kernel_siginfo *info, struct pid *pgrp)
1482 				struct pid *pid, enum pid_type type)
1489 		p = pid_task(pid, PIDTYPE_PID);
1503 int kill_pid_info(int sig, struct kernel_siginfo *info, struct pid *pid)
1505 	return kill_pid_info_type(sig, info, pid, PIDTYPE_TGID);
1508 static int kill_proc_info(int sig, struct kernel_siginfo *info, pid_t pid)
1512 	error = kill_pid_info(sig, info, find_vpid(pid));
1554 			 struct pid *pid, const struct cred *cred)
1571 	p = pid_task(pid, PIDTYPE_PID);
1598  * kill_something_info() interprets pid in interesting ways just like kill(2).
1604 static int kill_something_info(int sig, struct kernel_siginfo *info, pid_t pid)
1608 	if (pid > 0)
1609 		return kill_proc_info(sig, info, pid);
1612 	if (pid == INT_MIN)
1616 	if (pid != -1) {
1618 				pid ? find_vpid(-pid) : task_pgrp(current));
1906 static int kill_pgrp_info(int sig, struct kernel_siginfo *info, struct pid *pgrp)
1915 int kill_pgrp(struct pid *pid, int sig, int priv)
1917 	return kill_pgrp_info(sig, __si_special(priv), pid);
1921 int kill_pid(struct pid *pid, int sig, int priv)
1923 	return kill_pid_info(sig, __si_special(priv), pid);
1966 int send_sigqueue(struct sigqueue *q, struct pid *pid, enum pid_type type)
1990 	t = pid_task(pid, type);
2032 	struct pid *pid = task_pid(task);
2036 	__wake_up(&pid->wait_pidfd, TASK_NORMAL, 0,
2085 	 * task_active_pid_ns will always return the same pid namespace
3821  *  @pid: the PID of the process
3824 SYSCALL_DEFINE2(kill, pid_t, pid, int, sig)
3830 	return kill_something_info(sig, &info, pid);
3834  * Verify that the signaler and signalee either are in the same pid namespace
3835  * or that the signaler's pid namespace is an ancestor of the signalee's pid
3838 static bool access_pidfd_pidns(struct pid *pid)
3841 	struct pid_namespace *p = ns_of_pid(pid);
3870 static struct pid *pidfd_to_pid(const struct file *file)
3872 	struct pid *pid;
3874 	pid = pidfd_pid(file);
3875 	if (!IS_ERR(pid))
3876 		return pid;
3904 	struct pid *pid;
3921 	pid = pidfd_to_pid(f.file);
3922 	if (IS_ERR(pid)) {
3923 		ret = PTR_ERR(pid);
3928 	if (!access_pidfd_pidns(pid))
3961 		if ((task_pid(current) != pid || type > PIDTYPE_TGID) &&
3969 		ret = kill_pgrp_info(sig, &kinfo, pid);
3971 		ret = kill_pid_info_type(sig, &kinfo, pid, type);
3978 do_send_specific(pid_t tgid, pid_t pid, int sig, struct kernel_siginfo *info)
3984 	p = find_task_by_vpid(pid);
4007 static int do_tkill(pid_t tgid, pid_t pid, int sig)
4013 	return do_send_specific(tgid, pid, sig, &info);
4019  *  @pid: the PID of the thread
4026 SYSCALL_DEFINE3(tgkill, pid_t, tgid, pid_t, pid, int, sig)
4029 	if (pid <= 0 || tgid <= 0)
4032 	return do_tkill(tgid, pid, sig);
4037  *  @pid: the PID of the task
4042 SYSCALL_DEFINE2(tkill, pid_t, pid, int, sig)
4045 	if (pid <= 0)
4048 	return do_tkill(0, pid, sig);
4051 static int do_rt_sigqueueinfo(pid_t pid, int sig, kernel_siginfo_t *info)
4057 	    (task_pid_vnr(current) != pid))
4061 	return kill_proc_info(sig, info, pid);
4066  *  @pid: the PID of the thread
4070 SYSCALL_DEFINE3(rt_sigqueueinfo, pid_t, pid, int, sig,
4077 	return do_rt_sigqueueinfo(pid, sig, &info);
4082 			compat_pid_t, pid,
4090 	return do_rt_sigqueueinfo(pid, sig, &info);
4094 static int do_rt_tgsigqueueinfo(pid_t tgid, pid_t pid, int sig, kernel_siginfo_t *info)
4097 	if (pid <= 0 || tgid <= 0)
4104 	    (task_pid_vnr(current) != pid))
4107 	return do_send_specific(tgid, pid, sig, info);
4110 SYSCALL_DEFINE4(rt_tgsigqueueinfo, pid_t, tgid, pid_t, pid, int, sig,
4117 	return do_rt_tgsigqueueinfo(tgid, pid, sig, &info);
4123 			compat_pid_t, pid,
4131 	return do_rt_tgsigqueueinfo(tgid, pid, sig, &info);
4892 			   sig, t->pid);
4894 		kdb_printf("Signal %d is sent to process %d.\n", sig, t->pid);