#TIL: #Firefox on #Linux works fine with

user.max_user_namespaces = 0

as well as with

user.max_user_namespaces = 100

but not with

user.max_user_namespaces = 1

which seems to have been set by default on my #DebianUnstable since last week or so.

Also Firefox' error messages on the shell where I started it weren't really that helpful:

Failed to launch tab subprocess @fork (Error:28): file ipc/[…]
fork() failed: No space left on device: file ipc/[…]

#UserNS #UserNamespace #sysctl

Building a #Debian rootfs from an unprivileged user with deboostrap

https://broken-by-design.fr/posts/debootscrap/

#Security #UserNS #Fakeception