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| author | Dmitry Safonov <dima@arista.com> | 2019-11-12 02:27:15 +0100 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2020-01-14 12:20:59 +0100 |
| commit | 70ddf65184ec1e8989322f35193e4fde7377f0cc (patch) | |
| tree | 57c0c780122cece61b02950fe7c2ee6abd5457f1 /kernel/time | |
| parent | x86/vdso: On timens page fault prefault also VVAR page (diff) | |
| download | linux-70ddf65184ec1e8989322f35193e4fde7377f0cc.tar.xz linux-70ddf65184ec1e8989322f35193e4fde7377f0cc.zip | |
x86/vdso: Zap vvar pages when switching to a time namespace
The VVAR page layout depends on whether a task belongs to the root or
non-root time namespace. Whenever a task changes its namespace, the VVAR
page tables are cleared and then they will be re-faulted with a
corresponding layout.
Co-developed-by: Andrei Vagin <avagin@gmail.com>
Signed-off-by: Andrei Vagin <avagin@gmail.com>
Signed-off-by: Dmitry Safonov <dima@arista.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20191112012724.250792-27-dima@arista.com
Diffstat (limited to 'kernel/time')
| -rw-r--r-- | kernel/time/namespace.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/kernel/time/namespace.c b/kernel/time/namespace.c index d705c15d0273..0732964803b9 100644 --- a/kernel/time/namespace.c +++ b/kernel/time/namespace.c @@ -281,6 +281,7 @@ static void timens_put(struct ns_common *ns) static int timens_install(struct nsproxy *nsproxy, struct ns_common *new) { struct time_namespace *ns = to_time_ns(new); + int err; if (!current_is_single_threaded()) return -EUSERS; @@ -291,6 +292,10 @@ static int timens_install(struct nsproxy *nsproxy, struct ns_common *new) timens_set_vvar_page(current, ns); + err = vdso_join_timens(current, ns); + if (err) + return err; + get_time_ns(ns); put_time_ns(nsproxy->time_ns); nsproxy->time_ns = ns; @@ -305,6 +310,7 @@ int timens_on_fork(struct nsproxy *nsproxy, struct task_struct *tsk) { struct ns_common *nsc = &nsproxy->time_ns_for_children->ns; struct time_namespace *ns = to_time_ns(nsc); + int err; /* create_new_namespaces() already incremented the ref counter */ if (nsproxy->time_ns == nsproxy->time_ns_for_children) @@ -312,6 +318,10 @@ int timens_on_fork(struct nsproxy *nsproxy, struct task_struct *tsk) timens_set_vvar_page(tsk, ns); + err = vdso_join_timens(tsk, ns); + if (err) + return err; + get_time_ns(ns); put_time_ns(nsproxy->time_ns); nsproxy->time_ns = ns; |