From patchwork Thu Feb 29 17:04:04 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?Micka=C3=ABl_Sala=C3=BCn?= X-Patchwork-Id: 13577455 Received: from smtp-42ae.mail.infomaniak.ch (smtp-42ae.mail.infomaniak.ch [84.16.66.174]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 6F3B84AED6 for ; Thu, 29 Feb 2024 17:04:33 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=84.16.66.174 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1709226277; cv=none; b=okBYPt7/Wj/8aQFw7MkkqjREZ/vWLh4nkyvRdkYO1S3maZBo4rFldrvSFWUuPdKNPliE6kLZ7BFLcb4BDyl3hHSetGH8xOL1s7hI7UqxILIeRIBtowNCwTPlsOMOUyDHAV9lEQSlDOE6lpaGqyS8yzcXikVJUGpHIZ4FptLZ2AA= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1709226277; c=relaxed/simple; bh=f3wQ1gxeTPJnB2/Gx7Deo/AawwvRjdcM6xP+hwNtgJY=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=KEmfoe8pcIRkOrR96prnb21IxZTZ5N4luf/5JRID1l6Uvn8pvTethbPHfvTba3IPzN+BsyGBCg//bb8WfRB6zyssdenFP8spzyHPVqNfQvm4KAb8yzSdICHxvCbSrBJswtquNItjklDW8KRLr5GEBSbsHo+zlkkdLaocPHiIMc8= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=digikod.net; spf=pass smtp.mailfrom=digikod.net; dkim=pass (1024-bit key) header.d=digikod.net header.i=@digikod.net header.b=gcmoNxGK; arc=none smtp.client-ip=84.16.66.174 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=digikod.net Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=digikod.net Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=digikod.net header.i=@digikod.net header.b="gcmoNxGK" Received: from smtp-3-0000.mail.infomaniak.ch (unknown [10.4.36.107]) by smtp-3-3000.mail.infomaniak.ch (Postfix) with ESMTPS id 4TlyHt43J2zMrktk; Thu, 29 Feb 2024 18:04:26 +0100 (CET) Received: from unknown by smtp-3-0000.mail.infomaniak.ch (Postfix) with ESMTPA id 4TlyHt04GMz3g; Thu, 29 Feb 2024 18:04:26 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=digikod.net; s=20191114; t=1709226266; bh=f3wQ1gxeTPJnB2/Gx7Deo/AawwvRjdcM6xP+hwNtgJY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=gcmoNxGKgHYnKVXBDTBQhQzczqpk0AxQqq9JNXYdDODHvh/MAoOXfB/kwfdeEagYp NERBG2Kr74hChpupRTAofgZCk4ummr2hEYGU9T9zi+Tiqlcq/wnfCSFRB+ktAVcOJM XfkR6BWeRDyyrWQGtYg1MRUyDHGWxF7r/xVDhEOA= From: =?utf-8?q?Micka=C3=ABl_Sala=C3=BCn?= To: Brendan Higgins , David Gow , Kees Cook , Rae Moar , Shuah Khan Cc: =?utf-8?q?Micka=C3=ABl_Sala=C3=BCn?= , Alan Maguire , Borislav Petkov , Dave Hansen , "H . Peter Anvin" , Ingo Molnar , James Morris , Luis Chamberlain , "Madhavan T . Venkataraman" , Marco Pagani , Paolo Bonzini , Sean Christopherson , Stephen Boyd , Thara Gopinath , Thomas Gleixner , Vitaly Kuznetsov , Wanpeng Li , Zahra Tarkhani , kvm@vger.kernel.org, linux-hardening@vger.kernel.org, linux-hyperv@vger.kernel.org, linux-kernel@vger.kernel.org, linux-security-module@vger.kernel.org, linux-um@lists.infradead.org, x86@kernel.org Subject: [PATCH v1 3/8] kunit: Fix kthread reference Date: Thu, 29 Feb 2024 18:04:04 +0100 Message-ID: <20240229170409.365386-4-mic@digikod.net> In-Reply-To: <20240229170409.365386-1-mic@digikod.net> References: <20240229170409.365386-1-mic@digikod.net> Precedence: bulk X-Mailing-List: linux-hardening@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Infomaniak-Routing: alpha There is a race condition when a kthread finishes after the deadline and before the call to kthread_stop(), which may lead to use after free. Cc: Brendan Higgins Cc: David Gow Cc: Rae Moar Cc: Shuah Khan Signed-off-by: Mickaël Salaün Reviewed-by: Kees Cook --- lib/kunit/try-catch.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) diff --git a/lib/kunit/try-catch.c b/lib/kunit/try-catch.c index a5cb2ef70a25..73f5007f20ea 100644 --- a/lib/kunit/try-catch.c +++ b/lib/kunit/try-catch.c @@ -11,6 +11,7 @@ #include #include #include +#include #include "try-catch-impl.h" @@ -65,14 +66,15 @@ void kunit_try_catch_run(struct kunit_try_catch *try_catch, void *context) try_catch->context = context; try_catch->try_completion = &try_completion; try_catch->try_result = 0; - task_struct = kthread_run(kunit_generic_run_threadfn_adapter, - try_catch, - "kunit_try_catch_thread"); + task_struct = kthread_create(kunit_generic_run_threadfn_adapter, + try_catch, "kunit_try_catch_thread"); if (IS_ERR(task_struct)) { try_catch->try_result = PTR_ERR(task_struct); try_catch->catch(try_catch->context); return; } + get_task_struct(task_struct); + wake_up_process(task_struct); time_remaining = wait_for_completion_timeout(&try_completion, kunit_test_timeout()); @@ -82,6 +84,7 @@ void kunit_try_catch_run(struct kunit_try_catch *try_catch, void *context) kthread_stop(task_struct); } + put_task_struct(task_struct); exit_code = try_catch->try_result; if (!exit_code)