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Isolate the UTS namespace's domainname and hostname back

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Commit 7d69a1f4a7 ("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>
This commit is contained in:
Pavel Emelyanov 2007-11-28 16:21:38 -08:00 committed by Linus Torvalds
parent 48986f06b6
commit 32df81cbd5
1 changed files with 4 additions and 0 deletions
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4
kernel/utsname_sysctl.c
View file

@ -18,6 +18,10 @@
static void *get_uts(ctl_table *table, int write) static void *get_uts(ctl_table *table, int write)
{ {
char *which = table->data; 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) if (!write)
down_read(&uts_sem); down_read(&uts_sem);