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Message-ID: <6a117703dd9798bbb86eeaa6955764a9@ispras.ru>
Date: Tue, 13 Oct 2020 18:48:41 +0300
From: Alexey Izbyshev <izbyshev@...ras.ru>
To: musl@...ts.openwall.com
Subject: Re: Calling setxid() in a vfork()-child
On 2020-10-13 12:52, Laurent Bercot wrote:
> 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).
>
Thankfully, POSIX_SPAWN_SETSID was accepted into POSIX[1] and is
available in recent enough musl and glibc (and I also heard some rumors
about macOS).
But yes, even if we accept that simply setting some attributes for a new
process is enough (as opposed to running more complex logic requiring an
already created process, which is possible with fork()), having a fixed
of them for an evolving entity is problematic, more so since on Linux
posix_spawn() implementations are developed separately from the kernel.
[1] https://www.austingroupbugs.net/view.php?id=1044
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