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Add pgid_in_session() for validating TIOCSPGRP requests

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(approved by christos)
This commit is contained in:
dsl 2003-03-12 22:54:44 +00:00
parent ea5ffc0fa7
commit 5786e3a6e8
1 changed files with 28 additions and 2 deletions
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30
sys/kern/kern_proc.c
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@ -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"
@ -328,6 +328,32 @@ chgproccnt(uid_t uid, int diff)
return (diff);
}
/*
* 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?
*/