Rather than rebooting into a system with no entropy, regenerate the RNG
seed before rebooting, so that the new system has a fresh seed.
Fixes: a1ee38ab1a75 ("m68k: virt: Use RNG seed from bootinfo block")
Signed-off-by: Jason A. Donenfeld <Jason@xxxxxxxxx>
---
arch/m68k/virt/config.c | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/arch/m68k/virt/config.c b/arch/m68k/virt/config.c
index 4ab22946ff68..c41d2277de95 100644
--- a/arch/m68k/virt/config.c
+++ b/arch/m68k/virt/config.c
@@ -45,10 +45,18 @@ static void virt_halt(void)
;
}
+static struct bi_record *rng_seed_record;
+
static void virt_reset(void)
{
void __iomem *base = (void __iomem *)virt_bi_data.ctrl.mmio;
+ if (rng_seed_record && rng_seed_record->size > sizeof(*rng_seed_record) + 2) {
+ u16 len = rng_seed_record->size - sizeof(*rng_seed_record) - 2;
+ get_random_bytes((u8 *)rng_seed_record->data + 2, len);
+ *(u16 *)rng_seed_record->data = len;
+ }
+
iowrite32be(CMD_RESET, base + VIRT_CTRL_REG_CMD);
local_irq_disable();
while (1)
@@ -101,6 +109,8 @@ int __init virt_parse_bootinfo(const struct bi_record *record)
* length to prevent kexec from using it.
*/
memzero_explicit((void *)data, len + 2);
+ /* Store a reference to be filled in on reboot. */
+ rng_seed_record = (void *)record;
break;
}
default:
--
2.37.3
