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nsproxy: support CLONE_NEWTIME with setns()

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So far setns() was missing time namespace support. This was partially due
to it simply not being implemented but also because vdso_join_timens()
could still fail which made switching to multiple namespaces atomically
problematic. This is now fixed so support CLONE_NEWTIME with setns()

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Reviewed-by: Andrei Vagin <avagin@gmail.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Michael Kerrisk <mtk.manpages@gmail.com>
Cc: Serge Hallyn <serge@hallyn.com>
Cc: Dmitry Safonov <dima@arista.com>
Link: https://lore.kernel.org/r/20200706154912.3248030-4-christian.brauner@ubuntu.com
This commit is contained in:
Christian Brauner
2020-07-06 17:49:11 +02:00
parent 5cfea9a106
commit 76c12881a3
3 changed files with 26 additions and 6 deletions
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5
kernel/time/namespace.c
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@@ -280,7 +280,7 @@ static void timens_put(struct ns_common *ns)
put_time_ns(to_time_ns(ns));
}
static void timens_commit(struct task_struct *tsk, struct time_namespace *ns)
void timens_commit(struct task_struct *tsk, struct time_namespace *ns)
{
timens_set_vvar_page(tsk, ns);
vdso_join_timens(tsk, ns);
@@ -298,9 +298,6 @@ static int timens_install(struct nsset *nsset, struct ns_common *new)
!ns_capable(nsset->cred->user_ns, CAP_SYS_ADMIN))
return -EPERM;
timens_commit(current, ns);
get_time_ns(ns);
put_time_ns(nsproxy->time_ns);
nsproxy->time_ns = ns;