On 14.04.19 22:14, Christian Brauner wrote: Hi folks, > This patchset makes it possible to retrieve pid file descriptors at > process creation time by introducing the new flag CLONE_PIDFD to the > clone() system call as previously discussed. Sorry, for highjacking this thread, but I'm curious on what things to consider when introducing new CLONE_* flags. The reason I'm asking is: I'm working on implementing plan9-like fs namespaces, where unprivileged processes can change their own namespace at will. For that, certain traditional unix'ish things have to be disabled, most notably suid. As forbidding suid can be helpful in other scenarios, too, I thought about making this its own feature. Doing that switch on clone() seems a nice place for that, IMHO. As there might be potentially even more CLONE_* flags in the future, and the bitmask size is limited, this raises the question on how to proceed with those flag additions in the future. What's your thoughts on that ? --mtx -- Enrico Weigelt, metux IT consult Free software and Linux embedded engineering info@xxxxxxxxx -- +49-151-27565287
