lib/posix-process: Restrict pthread creation to clone()

The current implementation incorrectly creates a pthread in the current
process, for every new uk_thread created. This behavior is problematic
because during a syscall, libraries may create uk_threads that are
intended to act as kernel threads. Decouple pthread initializaiton from
uk_thread and limit it to clone().

Signed-off-by: Michalis Pappas <michalis@unikraft.io>
Approved-by: Andrei Tatar <andrei@unikraft.io>
Reviewed-by: Sergiu Moga <sergiu@unikraft.io>
Reviewed-by: Andrei Tatar <andrei@unikraft.io>
GitHub-Closes: #1627

diff --git a/lib/posix-process/process.c b/lib/posix-process/process.c
index e03d4ab30b8fa241489af290bf70ecddeb71aa15..ecb9e4debbae33c7505d72e125131af4907e2782 100644 (file)
--- a/lib/posix-process/process.c
+++ b/lib/posix-process/process.c
@@ -530,7 +530,7 @@ static void posix_thread_fini(struct uk_thread *child)
                pprocess_release(pprocess);
 }
 
-UK_THREAD_INIT_PRIO(posix_thread_init, posix_thread_fini, UK_PRIO_EARLIEST);
+UK_THREAD_INIT_PRIO(0, posix_thread_fini, UK_PRIO_EARLIEST);
 
 struct posix_process *pid2pprocess(pid_t pid)
 {