mailing list of musl libc
 help / color / mirror / code / Atom feed
From: Solar Designer <solar@openwall.com>
To: musl@lists.openwall.com
Subject: fd 0-2 on SUID/SGID program startup
Date: Mon, 22 Aug 2011 21:07:54 +0400	[thread overview]
Message-ID: <20110822170754.GA16515@openwall.com> (raw)

Rich,

As you're probably aware, glibc makes sure that fd 0-2 are open on
SUID/SGID program startup (opening them to /dev/null / /dev/full if
they're not already open).  This is needed to prevent misdirected
reads/writes by programs that use those well-known fd's (in fact, even
libc itself does) yet also open other files/sockets/whatever (so it may
get opened on one of these special fd's if they're not already taken).

I think musl must have the same countermeasure.  I think it lacks it
currently.

Do you agree?

Alexander


             reply	other threads:[~2011-08-22 17:07 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-08-22 17:07 Solar Designer [this message]
2011-08-22 18:32 ` Rich Felker
2011-08-25 22:54 ` Rich Felker

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20110822170754.GA16515@openwall.com \
    --to=solar@openwall.com \
    --cc=musl@lists.openwall.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
Code repositories for project(s) associated with this public inbox

	https://git.vuxu.org/mirror/musl/

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).