Users and permissions: accounts, login, enforced file permissions, setuid, su, passwd, doas
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
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# A root shell on /dev/tty6, with no login: the way in when login itself is
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# what has broken. Every other terminal asks who is there.
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#
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# An interactive shell on /dev/tty6.
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#
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# NVT is 6 (include/dev/vt.h) and the kernel creates all six terminals, but only
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