From 50b5e49ca694a60f84a2a12d62b6cb6ec8e3649f Mon Sep 17 00:00:00 2001
From: Alexander Potapenko <glider@google.com>
Date: Thu, 15 Sep 2022 17:03:50 +0200
Subject: kmsan: handle task creation and exiting

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

Link: https://lkml.kernel.org/r/20220915150417.722975-17-glider@google.com
Signed-off-by: Alexander Potapenko <glider@google.com>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Andrey Konovalov <andreyknvl@gmail.com>
Cc: Andrey Konovalov <andreyknvl@google.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Christoph Lameter <cl@linux.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Eric Biggers <ebiggers@google.com>
Cc: Eric Biggers <ebiggers@kernel.org>
Cc: Eric Dumazet <edumazet@google.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Cc: Ilya Leoshkevich <iii@linux.ibm.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Marco Elver <elver@google.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Michael S. Tsirkin <mst@redhat.com>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Petr Mladek <pmladek@suse.com>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vasily Gorbik <gor@linux.ibm.com>
Cc: Vegard Nossum <vegard.nossum@oracle.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
 mm/kmsan/core.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

(limited to 'mm/kmsan/core.c')

diff --git a/mm/kmsan/core.c b/mm/kmsan/core.c
index 5330138fda5b..112dce135c7f 100644
--- a/mm/kmsan/core.c
+++ b/mm/kmsan/core.c
@@ -37,6 +37,16 @@ bool kmsan_enabled __read_mostly;
  */
 DEFINE_PER_CPU(struct kmsan_ctx, kmsan_percpu_ctx);
 
+void kmsan_internal_task_create(struct task_struct *task)
+{
+	struct kmsan_ctx *ctx = &task->kmsan_ctx;
+	struct thread_info *info = current_thread_info();
+
+	__memset(ctx, 0, sizeof(*ctx));
+	ctx->allow_reporting = true;
+	kmsan_internal_unpoison_memory(info, sizeof(*info), false);
+}
+
 void kmsan_internal_poison_memory(void *address, size_t size, gfp_t flags,
 				  unsigned int poison_flags)
 {
-- 
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