Hi,
(First sorry for the thread break, I have some problems in receiving
mails actually.)
I dig a bit inside the code of bootloader, and I think it is possible
that the bootloader is unable to see hibernate signature when FDE is in
use.
Taking boot(bootdev) as entrypoint (stand/boot/boot.c +60):
it calls machdep() (arch/amd64/stand/libsa/machdep.c +48)
and call each probe routines.
In the list of probe routines, there is diskprobe()
(arch/amd64/stand/libsa/diskprobe.c +246), which call:
- hardprobe() (line 122),
- and only after sr_probe() (line 270)
It is hardprobe() that will call check_hibernate():
- allocating dip struct
- running check_hibernate() to set BDI_HIBVALID if HIBERNATE_MAGIC is
found.
To read the value, it uses dip->strategy() function.
arch/amd64/stand/libsa/diskprobe.c
491 error = dip->strategy(dip, F_READ, (daddr32_t)sec, sizeof hib,
&hib, NULL);
492 if (error == 0 && hib.magic == HIBERNATE_MAGIC) {
493 /* Hibernate present */
494 dip->bios_info.flags |= BDI_HIBVALID;
495 printf("&");
496 }
the actual code is biosstrategy() (arch/amd64/stand/libsa/biosdev.c +722)
which will call sr_strategy() if dip->sr_vol is not NULL.
arch/amd64/stand/libsa/biosdev.c
721 /* Intercept strategy for softraid volumes. */
722 if (dip->sr_vol)
723 return sr_strategy(dip->sr_vol, rw, blk, size, buf,
rsize);
If I correctly understood the code, dip->sr_vol is initialized on first
biosopen() call. But at this point, we didn't call it. Additionally,
sr_probe() isn't called either.
So dip->strategy() will read the encrypted data and not decrypted one,
so it is unable to found HIBERNATE_MAGIC (as it is encrypted).
Thanks.
--
Sebastien Marie
