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Kernel: Make Credentials the authority on process SID

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The SID was duplicated between the process credentials and protected
data. And to make matters worse, the credentials SID was not updated in
sys$setsid.

This patch fixes this by removing the SID from protected data and
updating the credentials SID everywhere.
This commit is contained in:
Andreas Kling 2023-04-04 16:49:42 +02:00
parent f764b8b113
commit 84ac957d7a
3 changed files with 20 additions and 11 deletions
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24
Kernel/Syscalls/setpgid.cpp
View file

@ -32,12 +32,26 @@ ErrorOr<FlatPtr> Process::sys$setsid()
// NOTE: ProcessGroup::create_if_unused_pgid() will fail with EPERM
// if a process group with the same PGID already exists.
auto process_group = TRY(ProcessGroup::create_if_unused_pgid(ProcessGroupID(pid().value())));
return with_mutable_protected_data([&](auto& protected_data) -> ErrorOr<FlatPtr> {
auto new_sid = SessionID(pid().value());
auto credentials = this->credentials();
auto new_credentials = TRY(Credentials::create(
credentials->uid(),
credentials->gid(),
credentials->euid(),
credentials->egid(),
credentials->suid(),
credentials->sgid(),
credentials->extra_gids(),
new_sid,
credentials->pgid()));
with_mutable_protected_data([&](auto& protected_data) {
protected_data.tty = nullptr;
protected_data.process_group = move(process_group);
protected_data.sid = pid().value();
return protected_data.sid.value();
protected_data.credentials = move(new_credentials);
});
return new_sid.value();
}
ErrorOr<FlatPtr> Process::sys$getpgid(pid_t pid)
@ -114,7 +128,7 @@ ErrorOr<FlatPtr> Process::sys$setpgid(pid_t specified_pid, pid_t specified_pgid)
}
// FIXME: There are more EPERM conditions to check for here..
auto process_group = TRY(ProcessGroup::find_or_create(new_pgid));
return process->with_mutable_protected_data([&process, &process_group, new_sid, new_pgid](auto& protected_data) -> ErrorOr<FlatPtr> {
return process->with_mutable_protected_data([&process, &process_group, new_pgid](auto& protected_data) -> ErrorOr<FlatPtr> {
auto credentials = process->credentials();
auto new_credentials = TRY(Credentials::create(
@ -125,7 +139,7 @@ ErrorOr<FlatPtr> Process::sys$setpgid(pid_t specified_pid, pid_t specified_pgid)
credentials->suid(),
credentials->sgid(),
credentials->extra_gids(),
new_sid,
credentials->sid(),
new_pgid));
protected_data.credentials = move(new_credentials);