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Date: Fri, 3 Nov 2017 02:56:47 +0300
From: "Dmitry V. Levin" <ldv@...linux.org>
To: oss-security@...ts.openwall.com
Subject: Re: tftpd-hpa - insecure chroot()
On Thu, Nov 02, 2017 at 03:16:55PM +0300, gremlin@...mlin.ru wrote:
> Just look at this code and guess how it would be compiled on most
> systems:
>
> ========================================
> /* Chroot and drop privileges */
> if (secure) {
> if (chroot(".")) {
> syslog(LOG_ERR, "chroot: %m");
> exit(EX_OSERR);
> }
> #ifdef __CYGWIN__
> chdir("/"); /* Cygwin chroot() bug workaround */
> #endif
> }
> ========================================
>
> :-)
Sorry, why do you think that
chdir(dir) == 0 && chroot(".") == 0
is any worse than
chroot(dir) == 0 && chdir("/") == 0
assuming that you have control over your signal handlers and can ensure
they won't issue any chdir or chroot calls between these two calls?
--
ldv
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