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charset=\"utf-8\"","Content-Transfer-Encoding":"base64","Errors-To":"kernel-team-bounces@lists.ubuntu.com","Sender":"\"kernel-team\" "},"content":"BugLink: https://bugs.launchpad.net/bugs/2150798\n\n[ Impact ]\n\nThe linux-raspi kernel flavor on Ubuntu 24.04 (Noble) arm64 does not have\nCONFIG_BPF_LSM enabled, while linux-image-generic arm64 does. This prevents\nRaspberry Pi users from using BPF LSM programs for security enforcement, even\nvia the lsm= boot parameter.\n\nThe raspi config annotations in Noble explicitly override the parent kernel's\nsetting:\n\n CONFIG_BPF_LSM policy<{'arm64': 'n'}> note<'Different from master'>\n\nAdditionally, the 26.04 (Resolute) linux-raspi changelog for 7.0.0-1009 includes\n\"[Config] Enable CONFIG_BPF_LSM\", but debian.raspi/config/config.common.ubuntu\nstill contains \"# CONFIG_BPF_LSM is not set\". This appears to be an incomplete\nrollout of the intended change.\n\n\n[ Test Case ]\n\n$ grep CONFIG_BPF_LSM /boot/config-$(uname -r)\nCONFIG_BPF_LSM=y\n\n\n[ Where Problems Could Occur ]\n\nTurning this on doesn't do anything by itself but badly written hooks can bring down the system."}