Update Linux to v5.10.157
Sourced from [1]
[1] https://cdn.kernel.org/pub/linux/kernel/v5.x/linux-5.10.157.tar.xz
Signed-off-by: Olivier Deprez <olivier.deprez@arm.com>
Change-Id: I7b30d9e98d8c465d6b44de8e7433b4a40b3289ba
diff --git a/kernel/livepatch/transition.c b/kernel/livepatch/transition.c
index f6310f8..b04b87a 100644
--- a/kernel/livepatch/transition.c
+++ b/kernel/livepatch/transition.c
@@ -611,9 +611,23 @@
/* Called from copy_process() during fork */
void klp_copy_process(struct task_struct *child)
{
- child->patch_state = current->patch_state;
- /* TIF_PATCH_PENDING gets copied in setup_thread_stack() */
+ /*
+ * The parent process may have gone through a KLP transition since
+ * the thread flag was copied in setup_thread_stack earlier. Bring
+ * the task flag up to date with the parent here.
+ *
+ * The operation is serialized against all klp_*_transition()
+ * operations by the tasklist_lock. The only exception is
+ * klp_update_patch_state(current), but we cannot race with
+ * that because we are current.
+ */
+ if (test_tsk_thread_flag(current, TIF_PATCH_PENDING))
+ set_tsk_thread_flag(child, TIF_PATCH_PENDING);
+ else
+ clear_tsk_thread_flag(child, TIF_PATCH_PENDING);
+
+ child->patch_state = current->patch_state;
}
/*