1 files changed, 4 insertions, 1 deletions

diff --git a/src/firejail/mountinfo.c b/src/firejail/mountinfo.c
index a700729d3..64a94bd84 100644
--- a/src/firejail/mountinfo.c
+++ b/src/firejail/mountinfo.c
@@ -22,7 +22,7 @@
 
 #include <fcntl.h>
 #ifndef O_PATH
-# define O_PATH 010000000
+#define O_PATH 010000000
 #endif
 
 #define MAX_BUF 4096
@@ -153,6 +153,7 @@ MountData *get_last_mount(void) {
 
 // Extract the mount id from /proc/self/fdinfo and return it.
 int get_mount_id(const char *path) {
+        EUID_ASSERT();
         assert(path);
 
         int fd = open(path, O_PATH|O_CLOEXEC);
@@ -162,7 +163,9 @@ int get_mount_id(const char *path) {
         char *fdinfo;
         if (asprintf(&fdinfo, "/proc/self/fdinfo/%d", fd) == -1)
                 errExit("asprintf");
+        EUID_ROOT();
         FILE *fp = fopen(fdinfo, "re");
+        EUID_USER();
         free(fdinfo);
         if (!fp)
                 goto errexit;