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Date: Mon, 11 Mar 2024 01:46:44 +0100
From: Alejandro Colomar <alx@...nel.org>
To: Thorsten Glaser <tg@...bsd.de>
Cc: Rich Felker <dalias@...c.org>, musl@...ts.openwall.com,
NRK <nrk@...root.org>, Guillem Jover <guillem@...rons.org>,
libc-alpha@...rceware.org, libbsd@...ts.freedesktop.org,
"Serge E. Hallyn" <serge@...lyn.com>,
"Skyler Ferrante (RIT Student)" <sjf5462@....edu>,
Iker Pedrosa <ipedrosa@...hat.com>,
Christian Brauner <christian@...uner.io>
Subject: Re: Re: Tweaking the program name for <err.h> functions
Hi Thorsten,
On Mon, Mar 11, 2024 at 12:19:27AM +0000, Thorsten Glaser wrote:
> Rich Felker dixit:
>
> >the string literal, because the string literal appears in modular
> >library code that gets called from multiple utilities, then printing
> >an error message (and even worse, exiting, if you do that too), rather
> >than returning meaningful error information up to the caller for it to
> >handle/display, is just really sloppy, low-quality programming.
>
> Libraries totally should not call exit and thus not err/errx,
> and warn/warnx is… also questionable at best.
>
> But modularised code that builds a shared object and a few
> binaries using it? Why not.
>
> The thing I don’t get is why changing __progname is desired,
> but I guess everyone has use cases for something.
setuid programs. Consider that a setuid program accidentally opens a
privileged file in fd 2. Now what happens if a random user can trigger
that accident, and write arbitrary text to a privileged file, just by
calling that setuid program with execlp("su", "inject this stuff", ...)?
Bad stuff.
Have a lovely night!
Alex
>
> bye,
> //mirabilos
> --
> (gnutls can also be used, but if you are compiling lynx for your own use,
> there is no reason to consider using that package)
> -- Thomas E. Dickey on the Lynx mailing list, about OpenSSL
--
<https://www.alejandro-colomar.es/>
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