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Date: Sat, 1 Nov 2014 23:07:08 +0100
From: Szabolcs Nagy <>
Subject: Re: Add login_tty

* Rich Felker <> [2014-11-01 17:45:03 -0400]:
> > 
> > I still don't understand how dup2 can fail when fd 0/1/2 are not open in
> > the parent. AFAIU, limits on the number of open fds are imposed by an
> > upper bound on the value of any fd. For the dup2 calls we know that the
> > newfds are certainly within the limits.
> Indeed, looking at the kernel code, I don't see any error paths where
> this operation could fail. I had figured some allocations might be
> needed to represent the new fd in the fd table, but it seems not. So
> the current code is probably unnecessary.

i think with seccomp syscall filtering anything can fail

although libc probably dont have to take that into account

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