socket-util: refuse "all" and "default" as valid ifnames

Let's avoid collisions with special sysctls.
2021-03-06 11:26:18 +09:00
parent 5d5b6442a2
commit 07a7441a1c
1 changed files with 5 additions and 0 deletions
@@ -736,6 +736,11 @@ bool ifname_valid_full(const char *p, IfnameValidFlags flags) {
        if (dot_or_dot_dot(p))
                return false;

+        /* Let's refuse "all" and "default" as interface name, to avoid collisions with the special sysctl
+         * directories /proc/sys/net/{ipv4,ipv6}/conf/{all,default} */
+        if (STR_IN_SET(p, "all", "default"))
+                return false;
+
        for (const char *t = p; *t; t++) {
                if ((unsigned char) *t >= 127U)
                        return false;