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Kernel: Guard Process "protected data" with a spinlock

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This ensures that both mutable and immutable access to the protected
data of a process is serialized.

Note that there may still be multiple TOCTOU issues around this, as we
have a bunch of convenience accessors that make it easy to introduce
them. We'll need to audit those as well.
This commit is contained in:
Andreas Kling 2022-08-21 12:18:26 +02:00
parent 728c3fbd14
commit 8ed06ad814
11 changed files with 348 additions and 300 deletions
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7
Kernel/Syscalls/setpgid.cpp
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@ -40,9 +40,10 @@ ErrorOr<FlatPtr> Process::sys$setsid()
m_pg = TRY(ProcessGroup::try_create(ProcessGroupID(pid().value())));
m_tty = nullptr;
ProtectedDataMutationScope scope { *this };
m_protected_values.sid = pid().value();
return sid().value();
return with_mutable_protected_data([&](auto& protected_data) -> ErrorOr<FlatPtr> {
protected_data.sid = pid().value();
return protected_data.sid.value();
});
}
ErrorOr<FlatPtr> Process::sys$getpgid(pid_t pid)