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Message-ID: <208f256649f23621ada37409eb02ff86@ispras.ru>
Date: Tue, 13 Oct 2020 18:24:45 +0300
From: Alexey Izbyshev <izbyshev@...ras.ru>
To: musl@...ts.openwall.com
Subject: Re: Calling setxid() in a vfork()-child
On 2020-10-13 05:47, Markus Wichmann wrote:
> If dropping privileges is all you want, then posix_spawn() has a flag
> for that. And if you are foregoing portability anyway by doing anything
> between vfork() and execve(), might as well use clone() and do it
> properly.
>
What do you mean by "do it properly"? Unless you mean doing syscalls, it
seems that I'd have the same issues with clone() (with CLONE_VFORK,
since I'm trying to avoid copying of page tables) as I do with vfork().
Namely, I'd still have to care about signals, and I wouldn't be able to
safely call setxid() (and, frankly, anything else from a C library if we
want a solution that's, while being Linux-specific, still portable
across C libraries).
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