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Kernel: Handle promise violations in the syscall handler
Previously we would crash the process immediately when a promise violation was found during a syscall. This is error prone, as we don't unwind the stack. This means that in certain cases we can leak resources, like an OwnPtr / RefPtr tracked on the stack. Or even leak a lock acquired in a ScopeLockLocker. To remedy this situation we move the promise violation handling to the syscall handler, right before we return to user space. This allows the code to follow the normal unwind path, and grantees there is no longer any cleanup that needs to occur. The Process::require_promise() and Process::require_no_promises() functions were modified to return ErrorOr<void> so we enforce that the errors are always propagated by the caller.
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66 changed files with 156 additions and 148 deletions
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@ -13,7 +13,7 @@ namespace Kernel {
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ErrorOr<FlatPtr> Process::sys$getsid(pid_t pid)
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{
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VERIFY_PROCESS_BIG_LOCK_ACQUIRED(this)
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require_promise(Pledge::proc);
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TRY(require_promise(Pledge::proc));
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if (pid == 0)
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return sid().value();
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auto process = Process::from_pid(pid);
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@ -27,7 +27,7 @@ ErrorOr<FlatPtr> Process::sys$getsid(pid_t pid)
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ErrorOr<FlatPtr> Process::sys$setsid()
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{
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VERIFY_PROCESS_BIG_LOCK_ACQUIRED(this)
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require_promise(Pledge::proc);
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TRY(require_promise(Pledge::proc));
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InterruptDisabler disabler;
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bool found_process_with_same_pgid_as_my_pid = false;
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Process::for_each_in_pgrp(pid().value(), [&](auto&) {
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@ -48,7 +48,7 @@ ErrorOr<FlatPtr> Process::sys$setsid()
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ErrorOr<FlatPtr> Process::sys$getpgid(pid_t pid)
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{
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VERIFY_PROCESS_BIG_LOCK_ACQUIRED(this)
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require_promise(Pledge::proc);
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TRY(require_promise(Pledge::proc));
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if (pid == 0)
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return pgid().value();
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auto process = Process::from_pid(pid);
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@ -60,7 +60,7 @@ ErrorOr<FlatPtr> Process::sys$getpgid(pid_t pid)
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ErrorOr<FlatPtr> Process::sys$getpgrp()
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{
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VERIFY_PROCESS_BIG_LOCK_ACQUIRED(this)
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require_promise(Pledge::stdio);
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TRY(require_promise(Pledge::stdio));
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return pgid().value();
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}
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@ -80,7 +80,7 @@ SessionID Process::get_sid_from_pgid(ProcessGroupID pgid)
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ErrorOr<FlatPtr> Process::sys$setpgid(pid_t specified_pid, pid_t specified_pgid)
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{
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VERIFY_PROCESS_BIG_LOCK_ACQUIRED(this)
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require_promise(Pledge::proc);
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TRY(require_promise(Pledge::proc));
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ProcessID pid = specified_pid ? ProcessID(specified_pid) : this->pid();
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if (specified_pgid < 0) {
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// The value of the pgid argument is less than 0, or is not a value supported by the implementation.
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