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PRoot — chroot, mount --bind, and binfmt_misc without privilege/setup
"PRoot is a user-space implementation of chroot, mount --bind, and binfmt_misc." Done on top of ptrace and qemu-user, which implies that it'll have the usual limitations of those.
to chroot container emulation namespace ptrace qemu ... on 22 March 2015
Various neat tricks with Linux mount namespaces, including how to emulate chroot using it (which you can now do as a regular user, thanks to CLONE_NEWUSER).
to chroot linux mount namespace programming ... on 02 July 2014
linux-user-chroot - setuid helper for making bind mounts and chrooting
Not a million miles from one of the sandboxing ideas I wanted to play with -- although this comes with some significant security caveats.
to build-systems chroot linux sandbox security ... on 24 October 2013
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tasty by Adam Sampson.