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Date: Mon, 22 Aug 2011 21:07:54 +0400
From: Solar Designer <solar@...nwall.com>
To: musl@...ts.openwall.com
Subject: fd 0-2 on SUID/SGID program startup
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
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