From d7a7ea5be60753c140a39ec6fa30e5ca4014dbb5 Mon Sep 17 00:00:00 2001
From: Konstantin Belousov <kib@FreeBSD.org>
Date: Tue, 18 May 2021 19:25:50 +0300
Subject: [PATCH] sys_process.c: extract ptrace_unsuspend()

Reviewed by:	jhb
Tested by:	pho
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
Differrential revision:	https://reviews.freebsd.org/D30351
---
 sys/kern/sys_process.c | 20 ++++++++++++++------
 sys/sys/ptrace.h       |  3 +++
 2 files changed, 17 insertions(+), 6 deletions(-)

diff --git a/sys/kern/sys_process.c b/sys/kern/sys_process.c
index 50157106a35e..b56c33203906 100644
--- a/sys/kern/sys_process.c
+++ b/sys/kern/sys_process.c
@@ -610,6 +610,19 @@ proc_set_traced(struct proc *p, bool stop)
 	p->p_ptevents = PTRACE_DEFAULT;
 }
 
+void
+ptrace_unsuspend(struct proc *p)
+{
+	PROC_LOCK_ASSERT(p, MA_OWNED);
+
+	PROC_SLOCK(p);
+	p->p_flag &= ~(P_STOPPED_TRACE | P_STOPPED_SIG | P_WAITED);
+	thread_unsuspend(p);
+	PROC_SUNLOCK(p);
+	itimer_proc_continue(p);
+	kqtimer_proc_continue(p);
+}
+
 static int
 proc_can_ptrace(struct thread *td, struct proc *p)
 {
@@ -1164,12 +1177,7 @@ kern_ptrace(struct thread *td, int req, pid_t pid, void *addr, int data)
 		 * suspended, use PT_SUSPEND to suspend it before
 		 * continuing the process.
 		 */
-		PROC_SLOCK(p);
-		p->p_flag &= ~(P_STOPPED_TRACE | P_STOPPED_SIG | P_WAITED);
-		thread_unsuspend(p);
-		PROC_SUNLOCK(p);
-		itimer_proc_continue(p);
-		kqtimer_proc_continue(p);
+		ptrace_unsuspend(p);
 		break;
 
 	case PT_WRITE_I:
diff --git a/sys/sys/ptrace.h b/sys/sys/ptrace.h
index 06f01a04fd9d..1e7c1c71056b 100644
--- a/sys/sys/ptrace.h
+++ b/sys/sys/ptrace.h
@@ -240,6 +240,9 @@ int	proc_write_fpregs32(struct thread *_td, struct fpreg32 *_fpreg32);
 int	proc_read_dbregs32(struct thread *_td, struct dbreg32 *_dbreg32);
 int	proc_write_dbregs32(struct thread *_td, struct dbreg32 *_dbreg32);
 #endif
+
+void	ptrace_unsuspend(struct proc *p);
+
 #else /* !_KERNEL */
 
 #include <sys/cdefs.h>