From: Todd C. Miller <Todd.Miller@courtesan.com>
Date: Wed, 27 May 2015 19:34:28 +0000 (-0600)
Subject: Restore old behavior where visudo prevents you from making the main
X-Git-Tag: SUDO_1_8_14^2~103
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=21f5753b7daf348d8ef4b57c208fd8c6e7cf996c;p=sudo

Restore old behavior where visudo prevents you from making the main
sudoers file zero length.
---

diff --git a/plugins/sudoers/visudo.c b/plugins/sudoers/visudo.c
index 2f65f2c31..b2e283996 100644
--- a/plugins/sudoers/visudo.c
+++ b/plugins/sudoers/visudo.c
@@ -451,10 +451,12 @@ edit_sudoers(struct sudoersfile *sp, char *editor, char *args, int lineno)
 	    goto done;
 	}
 	if (sb.st_size == 0 && orig_size != 0) {
-	    sudo_warnx(U_("zero length temporary file (%s), %s unchanged"),
-		sp->tpath, sp->path);
-	    sp->modified = true;
-	    goto done;
+	    /* Avoid accidental zeroing of main sudoers file. */
+	    if (sp == TAILQ_FIRST(&sudoerslist)) {
+		sudo_warnx(U_("zero length temporary file (%s), %s unchanged"),
+		    sp->tpath, sp->path);
+		goto done;
+	    }
 	}
     } else {
 	sudo_warnx(U_("editor (%s) failed, %s unchanged"), editor, sp->path);