[PATCH RFC v4 25/42] kmsan: handle task creation and exiting

[glider@google.com]

Tell KMSAN that a new task is created, so the tool creates a backing
metadata structure for that task.

Signed-off-by: Alexander Potapenko <glider@google.com>
To: Alexander Potapenko <glider@google.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Eric Dumazet <edumazet@google.com>
Cc: Wolfram Sang <wsa@the-dreams.de>
Cc: Petr Mladek <pmladek@suse.com>
Cc: Vegard Nossum <vegard.nossum@oracle.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Marco Elver <elver@google.com>
Cc: Andrey Konovalov <andreyknvl@google.com>
Cc: linux-mm@kvack.org

---

This patch was previously called "kmsan: call KMSAN hooks where needed"

v4:
 - split this patch away

Change-Id: I7a6a83419b0e038f8993175461255f462a430205
---
 kernel/exit.c    | 2 ++
 kernel/fork.c    | 2 ++
 kernel/kthread.c | 2 ++
 3 files changed, 6 insertions(+)

diff --git a/kernel/exit.c b/kernel/exit.c
index bcbd59888e67..9bdf732185c3 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -60,6 +60,7 @@
 #include <linux/writeback.h>
 #include <linux/shm.h>
 #include <linux/kcov.h>
+#include <linux/kmsan.h>
 #include <linux/random.h>
 #include <linux/rcuwait.h>
 #include <linux/compat.h>
@@ -719,6 +720,7 @@ void __noreturn do_exit(long code)
 
 	profile_task_exit(tsk);
 	kcov_task_exit(tsk);
+	kmsan_task_exit(tsk);
 
 	WARN_ON(blk_needs_flush_plug(tsk));
 
diff --git a/kernel/fork.c b/kernel/fork.c
index 2508a4f238a3..22c0d6213eca 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -37,6 +37,7 @@
 #include <linux/fdtable.h>
 #include <linux/iocontext.h>
 #include <linux/key.h>
+#include <linux/kmsan.h>
 #include <linux/binfmts.h>
 #include <linux/mman.h>
 #include <linux/mmu_notifier.h>
@@ -934,6 +935,7 @@ static struct task_struct *dup_task_struct(struct task_struct *orig, int node)
 	account_kernel_stack(tsk, 1);
 
 	kcov_task_init(tsk);
+	kmsan_task_create(tsk);
 
 #ifdef CONFIG_FAULT_INJECTION
 	tsk->fail_nth = 0;
diff --git a/kernel/kthread.c b/kernel/kthread.c
index b262f47046ca..33ca743ca8b5 100644
--- a/kernel/kthread.c
+++ b/kernel/kthread.c
@@ -17,6 +17,7 @@
 #include <linux/unistd.h>
 #include <linux/file.h>
 #include <linux/export.h>
+#include <linux/kmsan.h>
 #include <linux/mutex.h>
 #include <linux/slab.h>
 #include <linux/freezer.h>
@@ -350,6 +351,7 @@ struct task_struct *__kthread_create_on_node(int (*threadfn)(void *data),
 		set_cpus_allowed_ptr(task, cpu_all_mask);
 	}
 	kfree(create);
+	kmsan_task_create(task);
 	return task;
 }
 
-- 
2.24.1.735.g03f4e72817-goog