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Date: Mon, 11 Mar 2024 13:39:22 -0700
From: enh <enh@...gle.com>
To: sjf5462@....edu
Cc: Rich Felker <dalias@...c.org>, Andreas Schwab <schwab@...e.de>, Alejandro Colomar <alx@...nel.org>,
Thorsten Glaser <tg@...bsd.de>, 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>,
Iker Pedrosa <ipedrosa@...hat.com>, Christian Brauner <christian@...uner.io>
Subject: Re: Re: Tweaking the program name for <err.h> functions
On Mon, Mar 11, 2024 at 1:09 PM Skyler Ferrante (RIT Student)
<sjf5462@....edu> wrote:
>
> Yup, I agree. My confusion was from an incorrect assumption that
> non-suid / suid programs would be handled the same way. I knew that
> strace wouldn't keep it setuid by I didn't realize glibc only checked
> closed fds for suid programs (which makes sense, this doesn't matter
> for non-privileged programs).
>
> > application erroneously closes fd 2
>
> And hopefully no program does that, and if it does, that's their fault :)
programs get confused about fds and close the wrong ones all the time.
the fd equivalent of a malloc() double-free especially. bionic has a
fairly general protection against this class of error:
https://android.googlesource.com/platform/bionic/+/master/docs/fdsan.md
(fork() children do it on purpose all the time too :-) )
> Skyler
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