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Kernel: Add Credentials to hold a set of user and group IDs

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This patch adds a new object to hold a Process's user credentials:

- UID, EUID, SUID
- GID, EGID, SGID, extra GIDs

Credentials are immutable and child processes initially inherit the
Credentials object from their parent.

Whenever a process changes one or more of its user/group IDs, a new
Credentials object is constructed.

Any code that wants to inspect and act on a set of credentials can now
do so without worrying about data races.
This commit is contained in:
Andreas Kling 2022-08-20 18:25:54 +02:00
parent bec314611d
commit 122d7d9533
11 changed files with 366 additions and 128 deletions
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2
Kernel/Syscalls/fork.cpp
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@ -56,7 +56,7 @@ ErrorOr<FlatPtr> Process::sys$fork(RegisterState& regs)
child->m_protected_values.has_promises = m_protected_values.has_promises.load();
child->m_protected_values.has_execpromises = m_protected_values.has_execpromises.load();
child->m_protected_values.sid = m_protected_values.sid;
child->m_protected_values.extra_gids = m_protected_values.extra_gids;
child->m_protected_values.credentials = m_protected_values.credentials;
child->m_protected_values.umask = m_protected_values.umask;
child->m_protected_values.signal_trampoline = m_protected_values.signal_trampoline;
child->m_protected_values.dumpable = m_protected_values.dumpable;