Hi!
Surprised by seeing streaks of zeros every 4k on my geli encrypted drive, I
realized they are zero-padded sectors (i.e. the 9th sector underlying every
encrypted 4K). I was wondering if it’d be a good idea to do this instead:
[freebsd .../geom/eli]$ svn diff
Index: g_eli_integrity.c
===================================================================
--- g_eli_integrity.c (revision 343023)
+++ g_eli_integrity.c (working copy)
@@ -472,7 +472,7 @@
* only partially filled.
*/
if (bp->bio_cmd == BIO_WRITE)
- memset(data + sc->sc_alen + data_secsize, 0,
+ arc4random_buf(data + sc->sc_alen +
data_secsize,
encr_secsize - sc->sc_alen - data_secsize);
}
[freebsd .../geom/eli]$
Thanks!
— Arjan
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