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Never invoke utmp_update() recursively if we are root. Instead close the 

read-only file so it can be opened later. It can happen when a setuid
program utmp_update, seteuid(ruid) -> getutxent() -> seteuid(0) -> pututxent()
This commit is contained in:
christos 2011-09-17 01:52:29 +00:00
parent 8017e7237a
commit 369862dcef
1 changed files with 11 additions and 5 deletions
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16
lib/libc/gen/utmpx.c
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@ -1,4 +1,4 @@
/* $NetBSD: utmpx.c,v 1.26 2009/01/11 02:46:27 christos Exp $ */
/* $NetBSD: utmpx.c,v 1.27 2011/09/17 01:52:29 christos Exp $ */
/*-
* Copyright (c) 2002 The NetBSD Foundation, Inc.
@ -31,7 +31,7 @@
#include <sys/cdefs.h>
#if defined(LIBC_SCCS) && !defined(lint)
__RCSID("$NetBSD: utmpx.c,v 1.26 2009/01/11 02:46:27 christos Exp $");
__RCSID("$NetBSD: utmpx.c,v 1.27 2011/09/17 01:52:29 christos Exp $");
#endif /* LIBC_SCCS and not lint */
#include "namespace.h"
@ -247,9 +247,15 @@ pututxline(const struct utmpx *utx)
if (utx == NULL)
return NULL;
if (strcmp(_PATH_UTMPX, utfile) == 0)
if ((fp != NULL && readonly) || (fp == NULL && geteuid() != 0))
return utmp_update(utx);
if (strcmp(_PATH_UTMPX, utfile) == 0) {
if (geteuid() == 0) {
if (fp != NULL && readonly)
endutxent();
} else {
if (fp == NULL || readonly)
return utmp_update(utx);
}
}
(void)memcpy(&temp, utx, sizeof(temp));