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SECURITY fix: when spawning mksh on a new terminal (tty, not /dev/null), 

flush all of its I/O first – someone could have written on it beforehand
This commit is contained in:
tg 2008-04-11 19:55:24 +00:00
parent afaa3ffa59
commit fc607a6c1b
3 changed files with 13 additions and 9 deletions
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4
check.t
View File

@ -1,4 +1,4 @@
# $MirOS: src/bin/mksh/check.t,v 1.173 2008/04/02 17:09:45 tg Exp $
# $MirOS: src/bin/mksh/check.t,v 1.174 2008/04/11 19:55:23 tg Exp $
# $OpenBSD: bksl-nl.t,v 1.2 2001/01/28 23:04:56 niklas Exp $
# $OpenBSD: history.t,v 1.5 2001/01/28 23:04:56 niklas Exp $
# $OpenBSD: read.t,v 1.3 2003/03/10 03:48:16 david Exp $
@ -7,7 +7,7 @@
# http://www.research.att.com/~gsf/public/ifs.sh
expected-stdout:
@(#)MIRBSD KSH R33 2008/04/01
@(#)MIRBSD KSH R33 2008/04/11
description:
Check version of shell.
category: pdksh

14
misc.c
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@ -6,7 +6,7 @@
#include <grp.h>
#endif
__RCSID("$MirOS: src/bin/mksh/misc.c,v 1.71 2008/04/01 21:50:58 tg Exp $\t"
__RCSID("$MirOS: src/bin/mksh/misc.c,v 1.72 2008/04/11 19:55:23 tg Exp $\t"
MKSH_SH_H_ID);
#undef USE_CHVT
@ -1370,16 +1370,20 @@ chvt(const char *fn)
}
switch (fork()) {
case -1:
errorf("fork failed");
errorf("chvt: %s failed", "fork");
case 0:
break;
default:
exit(0);
}
if (setsid() == -1)
errorf("chvt: setsid failed");
if ((fn != dv + 1) && ioctl(fd, TIOCSCTTY, NULL) == -1)
errorf("chvt: TIOCSCTTY failed");
errorf("chvt: %s failed", "setsid");
if (fn != dv + 1) {
if (ioctl(fd, TIOCSCTTY, NULL) == -1)
errorf("chvt: %s failed", "TIOCSCTTY");
if (tcflush(fd, TCIOFLUSH))
errorf("chvt: %s failed", "TCIOFLUSH");
}
ksh_dup2(fd, 0, false);
ksh_dup2(fd, 1, false);
ksh_dup2(fd, 2, false);

4
sh.h
View File

@ -8,8 +8,8 @@
/* $OpenBSD: c_test.h,v 1.4 2004/12/20 11:34:26 otto Exp $ */
/* $OpenBSD: tty.h,v 1.5 2004/12/20 11:34:26 otto Exp $ */
#define MKSH_SH_H_ID "$MirOS: src/bin/mksh/sh.h,v 1.203 2008/04/06 23:27:19 tg Exp $"
#define MKSH_VERSION "R33 2008/04/01"
#define MKSH_SH_H_ID "$MirOS: src/bin/mksh/sh.h,v 1.204 2008/04/11 19:55:24 tg Exp $"
#define MKSH_VERSION "R33 2008/04/11"
#if HAVE_SYS_PARAM_H
#include <sys/param.h>