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3946a55291
This commit:
1) seed /dev/urandom with the saved seeds as early as possible
(see /lib/preinit/81_urandom_seed)
2) save a seed at /etc/urandom.seed if it doesn't exists
3) save a new seed each boot at "system.@system[0].urandom_seed"
(see /etc/init.d/urandom_seed)
We use getrandom() so we are sure /dev/urandom pool is initialized
Seed size is 512 bytes (ie /proc/sys/kernel/random/poolsize / 8)
it's the same size as in ubuntu 14.04 and all systemd systems
Seeding /dev/urandom doesn't change entropy estimation, so we still have
"random: ubus urandom read with 4 bits of entropy available"
messages in the logs, but we can now ignore them if
after "urandom-seed: Seeding with ..." message
Saving a new seed on each boot is disabled by default to avoid too much
writes without user consent
v2: log preinit messages to /dev/kmsg
v3: use non generic function name for logging, as /lib/preinit/ files
are all sourced together in /etc/preinit
v4: after a lot of discussion on the ML, use a uci config param
v5: config param is now the path of the seed
Signed-off-by: Etienne CHAMPETIER <champetier.etienne@gmail.com>
Acked-by: Jo-Philipp Wich <jo@mein.io>
|
8 years ago | |
|---|---|---|
| .. | ||
| 02_default_set_state | 13 years ago | |
| 10_indicate_failsafe | 8 years ago | |
| 10_indicate_preinit | 8 years ago | |
| 10_sysinfo | 8 years ago | |
| 30_failsafe_wait | 8 years ago | |
| 40_run_failsafe_hook | 8 years ago | |
| 50_indicate_regular_preinit | 10 years ago | |
| 70_initramfs_test | 11 years ago | |
| 80_mount_root | 9 years ago | |
| 81_urandom_seed | 8 years ago | |
| 99_10_failsafe_login | 8 years ago | |
| 99_10_run_init | 11 years ago | |