Merge pull request #31210 from poettering/chdir-hardening

WorkingDirectory= hardening

src/basic/mountpoint-util.h

@@ -73,3 +73,5 @@ bool mount_new_api_supported(void);
 unsigned long ms_nosymfollow_supported(void);
 
 int mount_option_supported(const char *fstype, const char *key, const char *value);
+
+bool path_below_api_vfs(const char *p);