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Message-ID: <afYDnAYav7qJndlr@netmeister.org>
Date: Sat, 2 May 2026 10:01:00 -0400
From: Jan Schaumann <jschauma@...meister.org>
To: oss-security@...ts.openwall.com
Subject: Re: uutils coreutils CVEs
Collin Funk <collin.funk1@...il.com> wrote:
> We can see that uutils 'mkfifo' creates the fifo with world readable and
> writable permissions and then uses chmod()
> umask(000) = 002
> umask(002) = 000
> mknodat(AT_FDCWD, "/tmp/fifo", S_IFIFO|0666) = 0
Minor difference, and not disputing the race condition
here, but doesn't this initially yield a fifo with
mode 664, not 666 due to the umask(002) right before?
Ie., not _world_ writable (although _group_ writable),
even prior to chmod(2).
-Jan
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