Hi, On Sun, Nov 27, 2022 at 09:12:44PM +0000, Matthew Garrett wrote: > On Tue, Nov 22, 2022 at 03:04:01AM +0100, Jason A. Donenfeld wrote: > > > + * We delete the seed here, and /hope/ that this causes EFI to > > + * also zero out its representation on disk. This is somewhat > > Several implementations I've worked with simply append a deletion marker > or append a new variable value until the variable store fills up > entirely, at which point a garbage collection event is either run or > scheduled for the next reboot. The spec doesn't define how this is > handled so unfortunately I don't think there's any way to get a pony > here. Yea this is a bummer. During my first attempt at this, I actually overwrote the whole thing with zeros and then deleted it. But Ard pointed out that this doesn't make a difference anyway. But, as it turns out, that's more or less the same thing that happens with seed files on SSDs (nobody calls fstrim after overwriting a seed file). So at the very least, it's no worse? Jason
