validate fds --preserve-fds

validate file descriptors passed from podman run and podman exec --preserve-fds.

Signed-off-by: Qi Wang <qiwan@redhat.com>

1 files changed, 10 insertions, 0 deletions

diff --git a/pkg/rootless/rootless_linux.c b/pkg/rootless/rootless_linux.c
index 0223c35ee..2e1fddc48 100644
--- a/pkg/rootless/rootless_linux.c
+++ b/pkg/rootless/rootless_linux.c
@@ -225,6 +225,16 @@ can_use_shortcut ()
   return ret;
 }
 
+int
+is_fd_inherited(int fd)
+{
+  if (open_files_set == NULL || fd > open_files_max_fd || fd < 0)
+  {
+    return 0;
+  }
+  return FD_ISSET(fd % FD_SETSIZE, &(open_files_set[fd / FD_SETSIZE])) ? 1 : 0;
+}
+
 static void __attribute__((constructor)) init()
 {
   const char *xdg_runtime_dir;