From 787237cc3fa549221581aad8595fda9c2481c9e7 Mon Sep 17 00:00:00 2001
From: trasz <trasz@FreeBSD.org>
Date: Fri, 13 Dec 2019 18:39:36 +0000
Subject: [PATCH] Add kern_getsid() and use it in Linuxulator; no functional
 changes.

Reviewed by:	kib
MFC after:	2 weeks
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D22647
---
 sys/compat/linux/linux_misc.c |  5 +----
 sys/kern/kern_prot.c          | 11 +++++++++--
 sys/sys/syscallsubr.h         |  1 +
 3 files changed, 11 insertions(+), 6 deletions(-)

diff --git a/sys/compat/linux/linux_misc.c b/sys/compat/linux/linux_misc.c
index ed2d0701af5c..bde9212d8c5a 100644
--- a/sys/compat/linux/linux_misc.c
+++ b/sys/compat/linux/linux_misc.c
@@ -1599,14 +1599,11 @@ linux_getuid(struct thread *td, struct linux_getuid_args *args)
 	return (0);
 }
 
-
 int
 linux_getsid(struct thread *td, struct linux_getsid_args *args)
 {
-	struct getsid_args bsd;
 
-	bsd.pid = args->pid;
-	return (sys_getsid(td, &bsd));
+	return (kern_getsid(td, args->pid));
 }
 
 int
diff --git a/sys/kern/kern_prot.c b/sys/kern/kern_prot.c
index a8e7c55ac042..7929d73316d7 100644
--- a/sys/kern/kern_prot.c
+++ b/sys/kern/kern_prot.c
@@ -189,15 +189,22 @@ struct getsid_args {
 #endif
 int
 sys_getsid(struct thread *td, struct getsid_args *uap)
+{
+
+	return (kern_getsid(td, uap->pid));
+}
+
+int
+kern_getsid(struct thread *td, pid_t pid)
 {
 	struct proc *p;
 	int error;
 
-	if (uap->pid == 0) {
+	if (pid == 0) {
 		p = td->td_proc;
 		PROC_LOCK(p);
 	} else {
-		p = pfind(uap->pid);
+		p = pfind(pid);
 		if (p == NULL)
 			return (ESRCH);
 		error = p_cansee(td, p);
diff --git a/sys/sys/syscallsubr.h b/sys/sys/syscallsubr.h
index f26e66920ca0..c6c57723e02b 100644
--- a/sys/sys/syscallsubr.h
+++ b/sys/sys/syscallsubr.h
@@ -140,6 +140,7 @@ int	kern_getppid(struct thread *);
 int	kern_getpeername(struct thread *td, int fd, struct sockaddr **sa,
 	    socklen_t *alen);
 int	kern_getrusage(struct thread *td, int who, struct rusage *rup);
+int	kern_getsid(struct thread *td, pid_t pid);
 int	kern_getsockname(struct thread *td, int fd, struct sockaddr **sa,
 	    socklen_t *alen);
 int	kern_getsockopt(struct thread *td, int s, int level, int name,