84c0844f56
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 |
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|---|---|---|
| bench | ||
| build-aux | ||
| carray | ||
| disked | ||
| dispd | ||
| doc | ||
| editor | ||
| ext | ||
| games | ||
| init | ||
| kblayout | ||
| kblayout-compiler | ||
| kernel | ||
| libc | ||
| libm | ||
| libmount | ||
| login | ||
| mkinitrd | ||
| regress | ||
| sf | ||
| sh | ||
| share/man | ||
| sysinstall | ||
| tix | ||
| trianglix | ||
| update-initrd | ||
| utils | ||
| .gitignore | ||
| LICENSE | ||
| Makefile | ||
| README | ||
README
The Sortix Operating System =========================== Sortix is a small self-hosting operating-system aiming to be a clean and modern POSIX implementation. It is a hobbyist operating system written from scratch with its own base system, including kernel and standard library, as well as ports of third party software. It has a straightforward installer and can be developed under itself. Releases come with the source code in /src, ready for tinkering. It has been in development since 2011 by a single developer and contributors. Though the system is stable and capable right now, it is still early in development, and a number of crucial features haven't been made yet. Releases are made yearly and future releases will add features such as networking, SMP, and USB that were skipped in favor of becoming self-hosting now. Documentation ------------- The system is documented as manual pages. Introductory system usage is covered in the user-guide(7) manual page. Links ----- For more information, please visit the official website: https://sortix.org/ Building Sortix --------------- Development of Sortix under itself is covered in development(7). Development from another operating system is covered in cross-development(7). You can view the cross-development(7) manual page with this command: man share/man/man7/cross-development.7 License ------- Copyright 2011-2016 Jonas 'Sortie' Termansen and contributors. Sortix is free software licensed under the ISC license as described in the LICENSE file. It also contains permissively licensed code from other projects.