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Users and permissions: accounts, login, enforced file permissions, setuid, su, passwd, doas

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The kernel now checks owner/group/other on open, create, unlink, rename, exec
and path search; honours set-user-id and set-group-id; restricts kill, mount,
reboot and mknod; keeps supplementary groups; and implements chown. devtmpfs
nodes carry owners and modes that chmod/chown keep. Terminals run login, the
image has root and schos, X starts as the ordinary user.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01EVRhxi9zpdW2uDUN4FVcao
This commit is contained in:
Nexoniarz 2026-10-26 13:16:07 +01:00
commit 020aa6113c
34 changed files with 1342 additions and 120 deletions
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5
docs/architecture/scheduler.md
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@ -102,9 +102,8 @@ tracked. Two rules, with the two errnos POSIX gives them:
alone. Without it nice is not a courtesy but a way for any process to
outrank the rest of the system by asking.
Both are inert today, because everything runs as root. They are written now
because the alternative is growing a priority knob and a permission model in
separate commits, and the window between the two is exactly the bug.
Both bite now that there are users ([users.md](users.md)); root is exempt from
both.
## Deliberately not a red-black tree