Commit 32df81cb authored Nov 28, 2007 by Pavel Emelyanov Committed by Linus Torvalds Nov 29, 2007

Isolate the UTS namespace's domainname and hostname back



Commit 7d69a1f4 ("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>

parent 48986f06

kernel/utsname_sysctl.c

+4 −0

Original line number	Diff line number	Diff line
		@@ -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);

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