[PATCH v2 3/5] virtiofsd: open /proc/self/fd/ in sandbox=NONE mode

[Vivek Goyal]

We need /proc/self/fd descriptor even in sandbox=NONE mode.

Signed-off-by: Vivek Goyal <vgoyal@redhat.com>
---
 tools/virtiofsd/passthrough_ll.c | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/tools/virtiofsd/passthrough_ll.c b/tools/virtiofsd/passthrough_ll.c
index cd91c4a831..76ef891105 100644
--- a/tools/virtiofsd/passthrough_ll.c
+++ b/tools/virtiofsd/passthrough_ll.c
@@ -2969,6 +2969,15 @@ static void setup_capabilities(char *modcaps_in)
     pthread_mutex_unlock(&cap.mutex);
 }
 
+static void setup_none(struct lo_data *lo)
+{
+    lo->proc_self_fd = open("/proc/self/fd", O_PATH);
+    if (lo->proc_self_fd == -1) {
+        fuse_log(FUSE_LOG_ERR, "open(\"/proc/self/fd\", O_PATH): %m\n");
+        exit(1);
+    }
+}
+
 /*
  * Use chroot as a weaker sandbox for environments where the process is
  * launched without CAP_SYS_ADMIN.
@@ -3014,8 +3023,10 @@ static void setup_sandbox(struct lo_data *lo, struct 
fuse_session *se,
     if (lo->sandbox == SANDBOX_NAMESPACE) {
         setup_namespaces(lo, se);
         setup_mounts(lo->source);
-    } else {
+    } else if (lo->sandbox == SANDBOX_CHROOT) {
         setup_chroot(lo);
+    } else {
+        setup_none(lo);
     }
 
     setup_seccomp(enable_syslog);
-- 
2.25.4