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-rw-r--r--src/nspawn/nspawn.c29
1 files changed, 28 insertions, 1 deletions
diff --git a/src/nspawn/nspawn.c b/src/nspawn/nspawn.c
index f8208607ce..a0809da743 100644
--- a/src/nspawn/nspawn.c
+++ b/src/nspawn/nspawn.c
@@ -411,12 +411,39 @@ static int mount_binds(const char *dest, char **l, unsigned long flags) {
STRV_FOREACH_PAIR(x, y, l) {
_cleanup_free_ char *where = NULL;
+ struct stat source_st, dest_st;
+
+ if (stat(*x, &source_st) < 0) {
+ log_error("failed to stat %s: %m", *x);
+ return -errno;
+ }
where = strjoin(dest, "/", *y, NULL);
if (!where)
return log_oom();
- mkdir_p_label(where, 0755);
+ if (stat(where, &dest_st) == 0) {
+ if ((source_st.st_mode & S_IFMT) != (dest_st.st_mode & S_IFMT)) {
+ log_error("The file types of %s and %s do not matching. Refusing bind mount",
+ *x, where);
+ return -EINVAL;
+ }
+ } else {
+ /* Create the mount point, but be conservative -- refuse to create block
+ * and char devices. */
+ if (S_ISDIR(source_st.st_mode))
+ mkdir_p_label(where, 0755);
+ else if (S_ISFIFO(source_st.st_mode))
+ mkfifo(where, 0644);
+ else if (S_ISSOCK(source_st.st_mode))
+ mknod(where, 0644 | S_IFSOCK, 0);
+ else if (S_ISREG(source_st.st_mode))
+ touch(where);
+ else {
+ log_error("Refusing to create mountpoint for file: %s", *x);
+ return -ENOTSUP;
+ }
+ }
if (mount(*x, where, "bind", MS_BIND, NULL) < 0) {
log_error("mount(%s) failed: %m", where);