On Mon, 2022-09-05 at 21:26 +0200, Kumar Kartikeya Dwivedi wrote: > On Mon, 5 Sept 2022 at 16:34, Roberto Sassu > <roberto.sassu@xxxxxxxxxxxxxxx> wrote: > > From: Roberto Sassu <roberto.sassu@xxxxxxxxxx> > > > > One of the desirable features in security is the ability to > > restrict import > > of data to a given system based on data authenticity. If data > > import can be > > restricted, it would be possible to enforce a system-wide policy > > based on > > the signing keys the system owner trusts. > > > > This feature is widely used in the kernel. For example, if the > > restriction > > is enabled, kernel modules can be plugged in only if they are > > signed with a > > key whose public part is in the primary or secondary keyring. > > > > For eBPF, it can be useful as well. For example, it might be useful > > to > > authenticate data an eBPF program makes security decisions on. > > > > [...] > > CI is crashing with NULL deref for test_progs-no_alu32 with llvm-16, > but I don't think the problem is in this series. This is most likely > unrelated to BPF, as the crash happens inside > kernel/time/tick-sched.c:tick_nohz_restart_sched_tick. > > This was the same case in > https://lore.kernel.org/bpf/CAP01T74steDfP6O8QOshoto3e3RnHhKtAeTbnrPBZS3YJXjvbA@xxxxxxxxxxxxxx. > > So, > https://github.com/kernel-patches/bpf/runs/8194263557?check_suite_focus=true > and > https://github.com/kernel-patches/bpf/runs/7982907380?check_suite_focus=true > > look similar to me, and may not be related to BPF. They only trigger > during runs compiled using LLVM 16, so maybe some compiler > transformation is surfacing the problem? Yes, I saw that too. Not sure what the cause could be. Thanks Roberto
