hail UB313!

[git.ikiwiki.info.git] / IkiWiki / Wrapper.pm

diff --git a/IkiWiki/Wrapper.pm b/IkiWiki/Wrapper.pm
index 52a7ca2c70e4ab05b45e5b3c2b852e43e57731f0..0f64a59f4c039ab24872457cc3529c364deee172 100644 (file)
--- a/IkiWiki/Wrapper.pm
+++ b/IkiWiki/Wrapper.pm
@@ -58,6 +58,7 @@ EOF
 /* A wrapper for ikiwiki, can be safely made suid. */
 #define _GNU_SOURCE
 #include <stdio.h>
+#include <sys/types.h>
 #include <unistd.h>
 #include <stdlib.h>
 #include <string.h>
@@ -75,6 +76,11 @@ $envsave
        newenviron[i]=NULL;
        environ=newenviron;
 
+       if (setregid(getegid(), -1) != 0 || setreuid(geteuid(), -1) != 0) {
+               perror("failed to drop real uid/gid");
+               exit(1);
+       }
+
        execl("$this", "$this", NULL);
        perror("failed to run $this");
        exit(1);