systemd/0043-sysusers-don-t-allow-user-names-longer-than-UT_NAMES.patch
2014-07-19 15:47:59 -04:00

53 lines
1.8 KiB
Diff

From e17ff7ab5115b80f0d2bd4989cd31889bd54fbb1 Mon Sep 17 00:00:00 2001
From: Lennart Poettering <lennart@poettering.net>
Date: Wed, 9 Jul 2014 19:20:58 +0200
Subject: [PATCH] sysusers: don't allow user names longer than UT_NAMESIZE
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
As pointed out by Miloslav Trmač it might be a good idea to make sure
that usernames stay with in the utmp-defined limits.
(cherry picked from commit 932ad62b84165b0acf690ea34c4b8083657ae244)
---
man/sysusers.d.xml | 2 +-
src/sysusers/sysusers.c | 4 ++++
2 files changed, 5 insertions(+), 1 deletion(-)
diff --git a/man/sysusers.d.xml b/man/sysusers.d.xml
index 549b3f6351..40f8715bc0 100644
--- a/man/sysusers.d.xml
+++ b/man/sysusers.d.xml
@@ -142,7 +142,7 @@ m authd input</programlisting>
<title>Name</title>
<para>The name field specifies the user or
- group name. It should be be shorter than 256
+ group name. It should be be shorter than 31
characters and avoid any non-ASCII characters,
and not begin with a numeric character. It is
strongly recommended to pick user and group
diff --git a/src/sysusers/sysusers.c b/src/sysusers/sysusers.c
index c0af69300a..f3ba8cf7b3 100644
--- a/src/sysusers/sysusers.c
+++ b/src/sysusers/sysusers.c
@@ -24,6 +24,7 @@
#include <grp.h>
#include <shadow.h>
#include <getopt.h>
+#include <utmp.h>
#include "util.h"
#include "hashmap.h"
@@ -1095,6 +1096,9 @@ static bool valid_user_group_name(const char *u) {
if ((size_t) (i-u) > (size_t) sz)
return false;
+ if ((size_t) (i-u) > UT_NAMESIZE - 1)
+ return false;
+
return true;
}