b014cb462c
changes since Xen 4.6.5: mostly bug fixes, including security fixes for XSA206, XSA211 to XSA244. PKGREVISION set to 1 to account for the fact that it's not a stock Xen 4.6.6. Note that, unlike upstream, pv-linear-pt defaults to true, so that NetBSD PV guests (including dom0) will continue to boot without changes to boot.cfg
54 lines
1.8 KiB
Text
54 lines
1.8 KiB
Text
$NetBSD: patch-XSA233,v 1.1 2017/10/17 10:57:34 bouyer Exp $
|
|
|
|
From: Juergen Gross <jgross@suse.com>
|
|
Subject: tools/xenstore: dont unlink connection object twice
|
|
|
|
A connection object of a domain with associated stubdom has two
|
|
parents: the domain and the stubdom. When cleaning up the list of
|
|
active domains in domain_cleanup() make sure not to unlink the
|
|
connection twice from the same domain. This could happen when the
|
|
domain and its stubdom are being destroyed at the same time leading
|
|
to the domain loop being entered twice.
|
|
|
|
Additionally don't use talloc_free() in this case as it will remove
|
|
a random parent link, leading eventually to a memory leak. Use
|
|
talloc_unlink() instead specifying the context from which the
|
|
connection object should be removed.
|
|
|
|
This is XSA-233.
|
|
|
|
Reported-by: Eric Chanudet <chanudete@ainfosec.com>
|
|
Signed-off-by: Juergen Gross <jgross@suse.com>
|
|
Reviewed-by: Ian Jackson <ian.jackson@eu.citrix.com>
|
|
|
|
--- xenstore/xenstored_domain.c.orig
|
|
+++ xenstore/xenstored_domain.c
|
|
@@ -221,10 +221,11 @@ static int destroy_domain(void *_domain)
|
|
static void domain_cleanup(void)
|
|
{
|
|
xc_dominfo_t dominfo;
|
|
- struct domain *domain, *tmp;
|
|
+ struct domain *domain;
|
|
int notify = 0;
|
|
|
|
- list_for_each_entry_safe(domain, tmp, &domains, list) {
|
|
+ again:
|
|
+ list_for_each_entry(domain, &domains, list) {
|
|
if (xc_domain_getinfo(*xc_handle, domain->domid, 1,
|
|
&dominfo) == 1 &&
|
|
dominfo.domid == domain->domid) {
|
|
@@ -236,8 +237,12 @@ static void domain_cleanup(void)
|
|
if (!dominfo.dying)
|
|
continue;
|
|
}
|
|
- talloc_free(domain->conn);
|
|
- notify = 0; /* destroy_domain() fires the watch */
|
|
+ if (domain->conn) {
|
|
+ talloc_unlink(talloc_autofree_context(), domain->conn);
|
|
+ domain->conn = NULL;
|
|
+ notify = 0; /* destroy_domain() fires the watch */
|
|
+ goto again;
|
|
+ }
|
|
}
|
|
|
|
if (notify)
|