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Message-Id: <44aca4d502f6891df1587ed1c4c9b6a1@trevorgross.com>
Date: Wed, 23 Sep 2026 00:53:16 +0000
From: <tg@...vorgross.com>
To: <linux-man@...r.kernel.org>, <musl@...ts.openwall.com>,
<libc-alpha@...rceware.org>
Subject: async-signal-safety of chroot
Hi everyone,
Is `chroot` async-signal-safe?
It is a somewhat popular pattern to `fork`, `chroot`, then `exec`.
However, only AS-safe functions may be called between `fork` and `exec`
(stated at [1]) but the manual entry for `chroot` makes no such mention
[2]. signal-safety(7) [3] only covers POSIX, so it is also not listed
there.
The rather old POSIX edition that last specified chroot also does not
mark it AS-safe [4], [5].
Is code using this pattern buggy, or is it just missing documentation?
I expect it's the latter but it would be nice to confirm either way.
Thanks,
Trevor
[1]: https://man7.org/linux/man-pages/man2/fork.2.html
[2]: https://man7.org/linux/man-pages/man2/chroot.2.html
[3]: https://man7.org/linux/man-pages/man7/signal-safety.7.html
[4]: https://pubs.opengroup.org/onlinepubs/7908799/xsh/chroot.html
[5]: https://pubs.opengroup.org/onlinepubs/7908799/xsh/sigaction.html
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