On Fri, Dec 16, 2022 at 12:39:56PM -0700, Jason A. Donenfeld wrote: > On Fri, Dec 16, 2022 at 10:15:14AM +0100, Johan Hovold wrote: > > Do not try to refresh the RNG seed in case the firmware does not support > > setting variables. > > > > This is specifically needed to prevent a NULL-pointer dereference on the > > Lenovo X13s with some firmware revisions. > > > > Fixes: e7b813b32a42 ("efi: random: refresh non-volatile random seed when RNG is initialized") > > Reported-by: Steev Klimaszewski <steev@xxxxxxxx> > > Reported-by: Bjorn Andersson <andersson@xxxxxxxxxx> > > Signed-off-by: Johan Hovold <johan+linaro@xxxxxxxxxx> > > --- > > Thanks very much for this, and sorry for the breakage. I'll try to get > this in before rc1 is cut, as I've got some other changes scheduled for > late in the merge window to send anyway. In case this one hasn't been picked up yet (it's not in linux-next), I just sent a v2 with an amended commit message with an explicit mention that as this is needed whenever the runtime services have been disabled (e.g. with PREEMPT_RT): https://lore.kernel.org/lkml/20221219101237.9872-1-johan+linaro@xxxxxxxxxx/ Johan