From: Alexey Izbyshev <izbyshev@ispras.ru>
To: musl@lists.openwall.com
Subject: Re: [musl] Calling setxid() in a vfork()-child
Date: Tue, 13 Oct 2020 18:24:45 +0300 [thread overview]
Message-ID: <208f256649f23621ada37409eb02ff86@ispras.ru> (raw)
In-Reply-To: <20201013024737.GB7816@voyager>
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).
next prev parent reply other threads:[~2020-10-13 15:25 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-12 9:27 Alexey Izbyshev
2020-10-12 14:55 ` Rich Felker
2020-10-12 20:30 ` Alexey Izbyshev
2020-10-13 2:47 ` Markus Wichmann
2020-10-13 9:52 ` Laurent Bercot
2020-10-13 15:48 ` Alexey Izbyshev
2020-10-13 15:24 ` Alexey Izbyshev [this message]
2020-10-13 16:07 ` Rich Felker
2020-10-13 16:52 ` Alexey Izbyshev
2020-10-13 17:05 ` Rich Felker
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