From afc32a4ae3be31bf9b667ece0044d8657566abfd Mon Sep 17 00:00:00 2001
From: jhb <jhb@FreeBSD.org>
Date: Thu, 11 Apr 2002 21:00:38 +0000
Subject: [PATCH] Use proc lock to protect p_ucred pointer while we deference
 it to read a few values.

---
 sys/compat/svr4/svr4_sysvec.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/sys/compat/svr4/svr4_sysvec.c b/sys/compat/svr4/svr4_sysvec.c
index 5292a8c76602..b6d1e2ca2c44 100644
--- a/sys/compat/svr4/svr4_sysvec.c
+++ b/sys/compat/svr4/svr4_sysvec.c
@@ -44,7 +44,9 @@
 #include <sys/imgact.h>
 #include <sys/imgact_elf.h>
 #include <sys/socket.h>
+#include <sys/lock.h>
 #include <sys/malloc.h>
+#include <sys/mutex.h>
 #include <sys/namei.h>
 #include <sys/vnode.h>
 #include <sys/module.h>
@@ -213,10 +215,12 @@ svr4_fixup(register_t **stack_base, struct image_params *imgp)
 	AUXARGS_ENTRY(pos, AT_FLAGS, args->flags);
 	AUXARGS_ENTRY(pos, AT_ENTRY, args->entry);
 	AUXARGS_ENTRY(pos, AT_BASE, args->base);
+	PROC_LOCK(imgp->proc);
 	AUXARGS_ENTRY(pos, AT_UID, imgp->proc->p_ucred->cr_ruid);
 	AUXARGS_ENTRY(pos, AT_EUID, imgp->proc->p_ucred->cr_svuid);
 	AUXARGS_ENTRY(pos, AT_GID, imgp->proc->p_ucred->cr_rgid);
 	AUXARGS_ENTRY(pos, AT_EGID, imgp->proc->p_ucred->cr_svgid);
+	PROC_UNLOCK(imgp->proc);
 	AUXARGS_ENTRY(pos, AT_NULL, 0);
 	
 	free(imgp->auxargs, M_TEMP);