diff options
| author | cinap_lenrek <cinap_lenrek@felloff.net> | 2023-04-08 20:30:47 +0000 |
|---|---|---|
| committer | cinap_lenrek <cinap_lenrek@felloff.net> | 2023-04-08 20:30:47 +0000 |
| commit | 60b1a2f82dc96b254d6dec1bfd1c14ca056c21dd (patch) | |
| tree | 1de5c2c26d7f7d0a0def0bbe4c11971a12735730 /sys/src/9/bcm | |
| parent | bd43bd6f1ae1b1ec7ee6873d9fd6766b049802e9 (diff) | |
kernel: Clear secrets on reboot
The idea is that when we reboot, we zero out
memory written by processes that have the private
flag set (such as factotum and keyfs), and also
clear the secrmem pool, which contains TLS keys
and the state of the random number generator.
This is so the newly booted kernel or firmware
will not find these secret keys in memory.
Diffstat (limited to 'sys/src/9/bcm')
| -rw-r--r-- | sys/src/9/bcm/main.c | 15 |
1 files changed, 12 insertions, 3 deletions
diff --git a/sys/src/9/bcm/main.c b/sys/src/9/bcm/main.c index a5b32d28f..03eeb51de 100644 --- a/sys/src/9/bcm/main.c +++ b/sys/src/9/bcm/main.c @@ -281,9 +281,14 @@ exit(int) { cpushutdown(); splfhi(); - if(m->machno == 0) - archreboot(); - rebootjump(0, 0, 0); + if(m->machno) + rebootjump(0, 0, 0); + + /* clear secrets */ + zeroprivatepages(); + poolreset(secrmem); + + archreboot(); } /* @@ -323,6 +328,10 @@ reboot(void *entry, void *code, ulong size) clockshutdown(); wdogoff(); + /* clear secrets */ + zeroprivatepages(); + poolreset(secrmem); + /* off we go - never to return */ rebootjump(entry, code, size); } |