https://bugs.gentoo.org/964340
https://gitlab.torproject.org/tpo/core/tor/-/issues/41164
https://gitlab.torproject.org/tpo/core/tor/-/commit/ed28f2a1b3b1d40027a8b8d8b8a3a5d112ae3829
https://gitlab.torproject.org/tpo/core/tor/-/commit/d2b5942e2820bd1d386e3c1e77a92363b05d28df

From ed28f2a1b3b1d40027a8b8d8b8a3a5d112ae3829 Mon Sep 17 00:00:00 2001
From: Jim Newsome <jnewsome@torproject.org>
Date: Mon, 2 Jun 2025 17:09:20 -0500
Subject: [PATCH] Add tor_pipe_cloexec

---
 src/lib/fdio/fdio.c | 28 ++++++++++++++++++++++++++++
 src/lib/fdio/fdio.h |  1 +
 2 files changed, 29 insertions(+)

diff --git a/src/lib/fdio/fdio.c b/src/lib/fdio/fdio.c
index 7e27644067..f132e370d1 100644
--- a/src/lib/fdio/fdio.c
+++ b/src/lib/fdio/fdio.c
@@ -14,6 +14,9 @@
 #ifdef HAVE_UNISTD_H
 #include <unistd.h>
 #endif
+#ifdef HAVE_FCNTL_H
+#include <fcntl.h>
+#endif
 #ifdef _WIN32
 #include <windows.h>
 #endif
@@ -118,3 +121,28 @@ write_all_to_fd_minimal(int fd, const char *buf, size_t count)
   }
   return 0;
 }
+
+#if defined(HAVE_PIPE2) && defined(O_CLOEXEC)
+int
+tor_pipe_cloexec(int pipefd[2])
+{
+  return pipe2(pipefd, O_CLOEXEC);
+}
+#elif defined(HAVE_PIPE) && defined(FD_CLOEXEC)
+int
+tor_pipe_cloexec(int pipefd[2])
+{
+  if (pipe(pipefd)) {
+    return -1;
+  }
+  if (fcntl(pipefd[0], F_SETFD, FD_CLOEXEC)) {
+    return -1;
+  }
+  if (fcntl(pipefd[1], F_SETFD, FD_CLOEXEC)) {
+    return -1;
+  }
+  return 0;
+}
+#else
+/* Intentionally leave symbol undefined. */
+#endif
diff --git a/src/lib/fdio/fdio.h b/src/lib/fdio/fdio.h
index 7551dedb9e..4fd35fda43 100644
--- a/src/lib/fdio/fdio.h
+++ b/src/lib/fdio/fdio.h
@@ -22,5 +22,6 @@ int tor_fd_setpos(int fd, off_t pos);
 int tor_fd_seekend(int fd);
 int tor_ftruncate(int fd);
 int write_all_to_fd_minimal(int fd, const char *buf, size_t count);
+int tor_pipe_cloexec(int pipefd[2]);
 
 #endif /* !defined(TOR_FDIO_H) */
-- 
GitLab

From d2b5942e2820bd1d386e3c1e77a92363b05d28df Mon Sep 17 00:00:00 2001
From: Jim Newsome <jnewsome@torproject.org>
Date: Mon, 2 Jun 2025 17:10:45 -0500
Subject: [PATCH] start_daemon: open pipe with cloexec

Fixes #41013
Fixes #41088
---
 changes/bug41088             | 4 ++++
 src/lib/process/daemon.c     | 3 ++-
 3 files changed, 7 insertions(+), 1 deletion(-)
 create mode 100644 changes/bug41088

diff --git a/changes/bug41088 b/changes/bug41088
new file mode 100644
index 0000000000..7f9c178f97
--- /dev/null
+++ b/changes/bug41088
@@ -0,0 +1,4 @@
+  o Minor bugfixes (bridges, pluggable transport):
+    - Fix a bug causing the initial tor process to hang intead of exiting with
+      RunAsDaemon, when pluggable transports are used.
+      Fixes bug 41088; bugfix on 0.4.9.1-alpha.
diff --git a/src/lib/process/daemon.c b/src/lib/process/daemon.c
index abd1d36576..1bfb162d85 100644
--- a/src/lib/process/daemon.c
+++ b/src/lib/process/daemon.c
@@ -13,6 +13,7 @@
 
 #ifndef _WIN32
 
+#include "lib/fdio/fdio.h"
 #include "lib/fs/files.h"
 #include "lib/log/log.h"
 #include "lib/thread/threads.h"
@@ -63,7 +64,7 @@ start_daemon(void)
     return 0;
   start_daemon_called = 1;
 
-  if (pipe(daemon_filedes)) {
+  if (tor_pipe_cloexec(daemon_filedes)) {
     /* LCOV_EXCL_START */
     log_err(LD_GENERAL,"pipe failed; exiting. Error was %s", strerror(errno));
     exit(1); // exit ok: during daemonize, pipe failed.
-- 
GitLab