From 7004840f3dc12e76822cee7b48902c08a553a118 Mon Sep 17 00:00:00 2001 From: Ross Burton Date: Thu, 12 Sep 2024 17:57:36 +0100 Subject: sanity: check for working user namespaces If user namespaces are not available (typically because AppArmor is blocking them), alert the user. We consider network isolation sufficiently important that this is a fatal error, and the user will need to configure AppArmor to allow bitbake to create a user namespace. [ YOCTO #15592 ] (From OE-Core rev: b6af956fe6e876957a49d4abf425e8c789bf0459) Signed-off-by: Ross Burton Signed-off-by: Richard Purdie --- meta/classes-global/sanity.bbclass | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+) diff --git a/meta/classes-global/sanity.bbclass b/meta/classes-global/sanity.bbclass index 1d242f0f0a..72dab0fea2 100644 --- a/meta/classes-global/sanity.bbclass +++ b/meta/classes-global/sanity.bbclass @@ -475,6 +475,29 @@ def check_wsl(d): bb.warn("You are running bitbake under WSLv2, this works properly but you should optimize your VHDX file eventually to avoid running out of storage space") return None +def check_userns(): + """ + Check that user namespaces are functional, as they're used for network isolation. + """ + + # There is a known failure case with AppAmrmor where the unshare() call + # succeeds (at which point the uid is nobody) but writing to the uid_map + # fails (so the uid isn't reset back to the user's uid). We can detect this. + parentuid = os.getuid() + pid = os.fork() + if not pid: + try: + bb.utils.disable_network() + except: + pass + os._exit(parentuid != os.getuid()) + + ret = os.waitpid(pid, 0)[1] + if ret: + bb.fatal("User namespaces are not usable by BitBake, possibly due to AppArmor.\n" + "See https://discourse.ubuntu.com/t/ubuntu-24-04-lts-noble-numbat-release-notes/39890#unprivileged-user-namespace-restrictions for more information.") + + # Require at least gcc version 8.0 # # This can be fixed on CentOS-7 with devtoolset-6+ @@ -641,6 +664,7 @@ def check_sanity_version_change(status, d): status.addresult(check_git_version(d)) status.addresult(check_perl_modules(d)) status.addresult(check_wsl(d)) + status.addresult(check_userns()) missing = "" -- cgit v1.2.3-54-g00ecf