On Wed, 6 Jan 2021 22:24:21 -0600 Paul via blfs-support <blfs-support@lists.linuxfromscratch.org> wrote:
> Question 2: Is it possible to run a system using only the kernel, grub > (or other bootloader), maybe a compiler/libc if I need it, and a single > executible loaded by the kernel that I would write in C? Just for the record, yes. What you are asking concerns the use of a custom init process, which is the initial "mother" process that all the other/later processes are spawned from. Your custom "init" program (if called something other than the system default /sbin/init ) can be specified via the init= kernel option: https://unix.stackexchange.com/questions/428347/how-to-pass-arguments-to-a-linux-kernel-init-bootparam https://www.cyberciti.biz/tips/10-boot-time-parameters-you-should-know-about-the-linux-kernel.html and that process, and only that process, will be started after the kernel is loaded. Note that the kernel init= option has been used in the past to bypass login security: https://unix.stackexchange.com/questions/172651/disallow-change-of-init-kernel-parameter Most bootloaders have a security feature that allows init= to be disabled. However, in that regard, always bear in mind that it is a difficult/impossible task to totally secure a machine that a potential attacker has physical access to. Cheers, Mike Shell -- http://lists.linuxfromscratch.org/listinfo/blfs-support FAQ: http://www.linuxfromscratch.org/blfs/faq.html Unsubscribe: See the above information page
