On 10/14/24 12:26 PM, Alex ThreeD wrote:
On Mon, Oct 14, 2024 at 12:10 AM Marek Vasut <ma...@denx.de> wrote:
Let's make this override-able via environment variable, because this
might be growing in the future again. Does this work ?
size_t len = env_get_ulong("kaslrseed_size", 10, 32);
Maybe `env_get_hex("rng_seed_size", 32)` would be better? As most other env are
hexadecimal.
The env vars are a mixed bag, this one is clearly decimal though.
Actually it seems that entropy required to init pool early has decreased in
Linux 5.19 from 64 bytes (2 * CHACHA_KEY_SIZE) to 32 bytes
(BLAKE2S_HASH_SIZE)
https://elixir.bootlin.com/linux/v5.18/source/drivers/char/random.c#L236
https://elixir.bootlin.com/linux/v5.19/source/drivers/char/random.c#L551
Anyway config knob should not harm.
A couple more random numbers would cover all the bases then.
