Only set allow_other when running as root

libfuse/lib/mount_generic.c

@@ -61,6 +61,7 @@ enum {
 };
 
 struct mount_opts {
+  int allow_other;
   int ishelp;
   int flags;
   int auto_unmount;
@@ -76,10 +77,12 @@ struct mount_opts {
 #define FUSE_MOUNT_OPT(t, p) { t, offsetof(struct mount_opts, p), 1 }
 
 static const struct fuse_opt fuse_mount_opts[] = {
+  FUSE_MOUNT_OPT("allow_other",         allow_other),
   FUSE_MOUNT_OPT("blkdev",		blkdev),
   FUSE_MOUNT_OPT("auto_unmount",	auto_unmount),
   FUSE_MOUNT_OPT("fsname=%s",		fsname),
   FUSE_MOUNT_OPT("subtype=%s",		subtype),
+  FUSE_OPT_KEY("allow_other",           KEY_KERN_OPT),
   FUSE_OPT_KEY("auto_unmount",		KEY_FUSERMOUNT_OPT),
   FUSE_OPT_KEY("blkdev",		KEY_FUSERMOUNT_OPT),
   FUSE_OPT_KEY("fsname=",		KEY_FUSERMOUNT_OPT),
@@ -549,8 +552,6 @@ int fuse_kern_mount(const char *mountpoint, struct fuse_args *args)
       fuse_opt_parse(args, &mo, fuse_mount_opts, fuse_mount_opt_proc) == -1)
     return -1;
 
-  fuse_opt_add_opt(&mo.kernel_opts,"allow_other");
-
   res = 0;
   if (mo.ishelp)
     goto out;

src/mergerfs.cpp

@@ -249,6 +249,7 @@ namespace l
   main(const int   argc_,
        char      **argv_)
   {
+    int rv;
     Config::Read    cfg;
     Config::ErrVec  errs;
     fuse_args       args;
@@ -283,9 +284,13 @@ namespace l
 
     procfs::init();
 
-    return fuse_main(args.argc,
+    rv = fuse_main(args.argc,
                    args.argv,
                    &ops);
+
+    syslog_info("exiting main loop with return code %d",rv);
+
+    return rv;
   }
 }
 

src/option_parser.cpp

@@ -26,6 +26,7 @@
 #include "num.hpp"
 #include "policy.hpp"
 #include "str.hpp"
+#include "syslog.hpp"
 #include "version.hpp"
 
 #include "fuse.h"
@@ -116,6 +117,10 @@ void
 set_default_options(fuse_args *args_)
 {
   set_option("default_permissions",args_);
+  if(geteuid() == 0)
+    set_option("allow_other",args_);
+  else
+    syslog_notice("not auto setting allow_other since not running as root");
 }
 
 static
@@ -124,7 +129,6 @@ should_ignore(const std::string &key_)
 {
   static const std::set<std::string> IGNORED_KEYS =
     {
-      "allow_other",
       "atomic_o_trunc",
       "big_writes",
       "cache.open",