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Date: Tue, 13 Oct 2020 09:52:54 +0000
From: "Laurent Bercot" <>
Subject: Re: Calling setxid() in a vfork()-child

>If dropping privileges is all you want, then posix_spawn() has a flag
>for that.

  But it does not. All POSIX_SPAWN_RESETIDS does is make sure that a
s-bit program does not spawn a child with the same effective uid as
its caller; there is nothing in posix_spawn() about dropping root

  This is one of process state change operations that are lacking in
posix_spawn(), along with being able to spawn the child as a session
leader (despite being able to spawn it as a process group leader).

  That's what makes exhaustive attribute listing a bad function design:
there is always an attribute that designers forget. I understand how
useful posix_spawn() is for portable correctness, I use it over fork()
whenever I can, but it is definitely not complete without helper
programs and it's an ugly wart that nobody benefits from ignoring.


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