Jonas 'Sortie' Termansen 84c0844f56 Seed kernel entropy with randomness from the previous boot. ... The bootloader will now load the /boot/random.seed file if it exists, in which case the kernel will use it as the initial kernel entropy. The kernel warns if no random seed was loaded, unless the --no-random-seed option was given. This option is used for live environments that inherently have no prior secret state. The kernel initializes its entropy pool from the random seed as of the first things, so randomness is available very early on. init(8) will emit a fresh /boot/random.seed file on boot to avoid the same entropy being used twice. init(8) also writes out /boot/random.seed on system shutdown where the system has the most entropy. init(8) will warn if writing the file fails, except if /boot is a real-only filesystem, and keeping such state is impossible. The system administrator is then responsible for ensuring the bootloader somehow passes a fresh random seed on the next boot. /boot/random.seed must be owned by the root user and root group and must have file permissions 600 to avoid unprivileged users can read it. The file is passed to the kernel by the bootloader as a multiboot module with the command line --random-seed. If no random seed is loaded, the kernel attempts a poor quality fallback where it seeds the kernel arc4random(3) continuously with the current time. The timing variance may provide some effective entropy. There is no real kernel entropy gathering yet. The read of the CMOS real time clock is moved to an early point in the kernel boot, so the current time is available as fallback entropy. The kernel access of the random seed module is supposed to be infallible and happens before the kernel log is set up, but there is not yet a failsafe API for mapping single pages in the early kernel. sysupgrade(8) creates /boot/random.seed if it's absent as a temporary compatibility measure for people upgrading from the 1.0 release. The GRUB port will need to be upgraded with support for /boot/random.seed in the 10_sortix script. Installation with manual bootloader configuration will need to load the random seed with the --random-seed command line. With GRUB, this can be done with: module /boot/random.seed --random-seed		2016-10-04 00:34:50 +02:00
..
disk
fs
gpu/bga
include/sortix
kb
mouse
net
x64
x86
x86-family
.gitignore
addralloc.cpp
alarm.cpp
clock.cpp
com.cpp
com.h
copy.cpp
descriptor.cpp
dtable.cpp
elf.cpp
end.cpp
fcache.cpp
fsfunc.cpp
hostname.cpp
identity.cpp
initrd.cpp
initrd.h
inode.cpp
interlock.cpp
interrupt.cpp
io.cpp
ioctx.cpp
kernel.cpp
kernelinfo.cpp
kthread.cpp
lfbtextbuffer.cpp
lfbtextbuffer.h
libk.cpp
linebuffer.cpp
linebuffer.h
log.cpp
logterminal.cpp
logterminal.h
Makefile
memorymanagement.cpp
mtable.cpp
multiboot.h
op-new.cpp
panic.cpp
partition.cpp
partition.h
pci-mmio.cpp
pci.cpp
pipe.cpp
poll.cpp
process.cpp
psctl.cpp
ptable.cpp
random.cpp
refcount.cpp
registers.cpp
resource.cpp
scheduler.cpp
segment.cpp
signal.cpp
sockopt.cpp
string.cpp
syscall.cpp
textbuffer.cpp
textterminal.cpp
textterminal.h
thread.cpp
time.cpp
timer.cpp
uart.cpp
uart.h
user-timer.cpp
vga.cpp
vga.h
vgafont.f16
vgatextbuffer.cpp
vgatextbuffer.h
video.cpp
vnode.cpp
worker.cpp