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Date: Fri, 9 Jun 2023 09:05:15 -0600
From: Tali Auster <tali.auster@...il.com>
To: musl@...ts.openwall.com
Subject: execve with null envp
Hello,
Is there any specific behavior specified when NULL is passed for envp in
any of the exec* methods that accept it? I took a quick look at the
source tree, and process/execve.c has a comment suggesting that the
correct behavior may be to use environ for envp before passing the NULL
to the syscall unchanged. My intuition - and, in practice, Linux with
glibc seems to agree - is that a NULL envp means an empty environment. I
imagine the answer to this question may just be a vague shrug, but does
POSIX mandate anything specific here? Or, perhaps a question with a more
clear answer, can my userspace code call execve(pathname, argv, NULL)
and reliably expect the child to have an empty environment?
Hopefully this is on-topic for this list; regardless, thanks for any
help or direction y'all can provide!
Tali Auster
They/Them
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