Date: Thu, 12 Feb 2015 03:16:59 -0500 From: Marcus Reid <marcus@blazingdot.com> To: =?iso-8859-1?Q?Jean-S=E9bastien_P=E9dron?= <dumbbell@FreeBSD.org> Cc: freebsd-current@freebsd.org Subject: Re: unbound crashes on bootup Message-ID: <20150212081659.GA12716@blazingdot.com> In-Reply-To: <54DB9A0C.1010806@FreeBSD.org> References: <1264.1423227963@critter.freebsd.dk> <54DB9A0C.1010806@FreeBSD.org>
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On Wed, Feb 11, 2015 at 07:06:04PM +0100, Jean-Sébastien Pédron wrote:
> On 06.02.2015 14:06, Poul-Henning Kamp wrote:
> > I just updated my -current to r278283, and unbound (still) croaks
> > during bootup:
>
> Hi!
>
> I have a similar problem. Also, unbound crashes each time I start/stop
> OpenVPN. I suppose the problem is the same in both cases.
>
> The crash happens in the config_lookup_uid() in
> contrib/unbound/util/config_file.c. Here's the code:
>
> struct passwd *pwd;
> if((pwd = getpwnam(cfg->username)) == NULL)
> log_err("user '%s' does not exist.", cfg->username);
> cfg->uid = pwd->pw_uid;
>
> getpwnam(3) returns NULL: an error message is logged but the function
> doesn't return. Therefore, the program segfaults on "pwd->pw_uid" on the
> next line.
The reason this crash happens is that unbound is chrooted and there is
no /etc/pwd.db for getpwnam() to look at.
A workaround is to mkdir /var/unbound/etc and put a copy of /etc/pwd.db
into it (or even a reduced version that only contains the unbound user).
I submitted a bug report for this yesterday.
Marcus
>
> But why did getpwnam(3) return NULL in the first place? It looks for the
> "unbound" user which exists. getpwnam() calls _nsdispatch() which fails.
>
> I have the default nsswitch.conf. I didn't look at the problem more
> deeply yet, but could getpwnam()/_nsdispatch() be unhappy with the
> absence of a working DNS resolver (unbound is being (re)started)?
>
> --
> Jean-Sébastien Pédron
>
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