utils: use O_PATH when opening /dev

Use the O_PATH and O_DIRECTORY flags when opening the "/dev" path for the
subsequent openat() call to ensure that it is indeed a directory.

Signed-off-by: Jo-Philipp Wich <jo@mein.io>

diff --git a/utils/utils.c b/utils/utils.c
index ebf5447..e2e3396 100644 (file)
--- a/utils/utils.c
+++ b/utils/utils.c
@@ -165,7 +165,7 @@ int patch_fd(const char *device, int fd, int flags)
                device = "/dev/null";
 
        if (*device != '/') {
-               dfd = open("/dev", O_RDONLY);
+               dfd = open("/dev", O_PATH|O_DIRECTORY);
 
                if (dfd < 0)
                        return -1;