Isolate the UTS namespace's domainname and hostname back

Commit 7d69a1f4a72b18876c99c697692b78339d491568 ("remove CONFIG_UTS_NS and CONFIG_IPC_NS") by Cedric Le Goater accidentally removed the code that prevented the uts->hostname and uts->domainname values from being overwritten from another namespace. In other words, setting hostname/domainname via sysfs (echo xxx > /proc/sys/kernel/(host|domain)name) cased the new value to be set in init UTS namespace only. Return the isolation back. Signed-off-by: Pavel Emelyanov <xemul@openvz.org> Acked-by: Cedric Le Goater <clg@fr.ibm.com> Acked-by: Serge Hallyn <serue@us.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Isolate the UTS namespace's domainname and hostname back
Commit 7d69a1f4a72b18876c99c697692b78339d491568 ("remove CONFIG_UTS_NS and CONFIG_IPC_NS") by Cedric Le Goater accidentally removed the code that prevented the uts->hostname and uts->domainname values from being overwritten from another namespace. In other words, setting hostname/domainname via sysfs (echo xxx > /proc/sys/kernel/(host|domain)name) cased the new value to be set in init UTS namespace only. Return the isolation back. Signed-off-by: Pavel Emelyanov <xemul@openvz.org> Acked-by: Cedric Le Goater <clg@fr.ibm.com> Acked-by: Serge Hallyn <serue@us.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Pavel Emelyanov · Linus Torvalds
1 parent 48986f06b6
Showing 1 changed file with 4 additions and 0 deletions Side-by-side Diff
kernel/utsname_sysctl.c
@@ -18,6 +18,10 @@
 static void *get_uts(ctl_table *table, int write)
 {
 	char *which = table->data;
+	struct uts_namespace *uts_ns;
+
+	uts_ns = current->nsproxy->uts_ns;
+	which = (which - (char *)&init_uts_ns) + (char *)uts_ns;
  
 	if (!write)
 		down_read(&uts_sem);
...	...	@@ -18,6 +18,10 @@
18	18	static void get_uts(ctl_table table, int write)
19	19	{
20	20	char *which = table->data;
	21	+ struct uts_namespace *uts_ns;
	22	+
	23	+ uts_ns = current->nsproxy->uts_ns;
	24	+ which = (which - (char )&init_uts_ns) + (char )uts_ns;
21	25
22	26	if (!write)
23	27	down_read(&uts_sem);