[src/trunk]: src/sys/kern Add pgid_in_session() for validating TIOCSPGRP requ...

[dsl <dsl%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/13fac1cb4b73
branches:  trunk
changeset: 544138:13fac1cb4b73
user:      dsl <dsl%NetBSD.org@localhost>
date:      Wed Mar 12 22:54:44 2003 +0000

description:
Add pgid_in_session() for validating TIOCSPGRP requests
(approved by christos)

diffstat:

 sys/kern/kern_proc.c |  30 ++++++++++++++++++++++++++++--
 1 files changed, 28 insertions(+), 2 deletions(-)

diffs (51 lines):

diff -r d18e309ab5cd -r 13fac1cb4b73 sys/kern/kern_proc.c
--- a/sys/kern/kern_proc.c      Wed Mar 12 22:46:25 2003 +0000
+++ b/sys/kern/kern_proc.c      Wed Mar 12 22:54:44 2003 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: kern_proc.c,v 1.59 2003/03/12 16:39:01 dsl Exp $       */
+/*     $NetBSD: kern_proc.c,v 1.60 2003/03/12 22:54:44 dsl Exp $       */
 
 /*-
  * Copyright (c) 1999 The NetBSD Foundation, Inc.
@@ -73,7 +73,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: kern_proc.c,v 1.59 2003/03/12 16:39:01 dsl Exp $");
+__KERNEL_RCSID(0, "$NetBSD: kern_proc.c,v 1.60 2003/03/12 22:54:44 dsl Exp $");
 
 #include "opt_kstack.h"
 
@@ -329,6 +329,32 @@
 }
 
 /*
+ * Check that the specifies process group in in the session of the
+ * specified process.
+ * Treats -ve ids as process ids.
+ * Used to validate TIOCSPGRP requests.
+ */
+int
+pgid_in_session(struct proc *p, pid_t pg_id)
+{
+       struct pgrp *pgrp;
+
+       if (pg_id < 0) {
+               struct proc *p1 = pfind(-pg_id);
+       if (p1 == NULL)
+               return EINVAL;
+               pgrp = p1->p_pgrp;
+       } else {
+               pgrp = pgfind(pg_id);
+               if (pgrp == NULL)
+                   return EINVAL;
+       }
+       if (pgrp->pg_session != p->p_pgrp->pg_session)
+               return EPERM;
+       return 0;
+}
+
+/*
  * Is p an inferior of q?
  */
 int