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authorDmitry Safonov <dima@arista.com>2019-11-12 01:27:15 +0000
committerThomas Gleixner <tglx@linutronix.de>2020-01-14 12:20:59 +0100
commit70ddf65184ec1e8989322f35193e4fde7377f0cc (patch)
tree57c0c780122cece61b02950fe7c2ee6abd5457f1 /include/linux/time_namespace.h
parente6b28ec65b6d433624a2c290073bc356c4fce914 (diff)
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 'include/linux/time_namespace.h')
-rw-r--r--include/linux/time_namespace.h9
1 files changed, 9 insertions, 0 deletions
diff --git a/include/linux/time_namespace.h b/include/linux/time_namespace.h
index 6b7767f7df4a..04a2ba8b8a06 100644
--- a/include/linux/time_namespace.h
+++ b/include/linux/time_namespace.h
@@ -31,6 +31,9 @@ struct time_namespace {
extern struct time_namespace init_time_ns;
#ifdef CONFIG_TIME_NS
+extern int vdso_join_timens(struct task_struct *task,
+ struct time_namespace *ns);
+
static inline struct time_namespace *get_time_ns(struct time_namespace *ns)
{
kref_get(&ns->kref);
@@ -77,6 +80,12 @@ static inline ktime_t timens_ktime_to_host(clockid_t clockid, ktime_t tim)
}
#else
+static inline int vdso_join_timens(struct task_struct *task,
+ struct time_namespace *ns)
+{
+ return 0;
+}
+
static inline struct time_namespace *get_time_ns(struct time_namespace *ns)
{
return NULL;