From patchwork Thu Feb 29 17:04:06 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: 13577459 Received: from smtp-8fac.mail.infomaniak.ch (smtp-8fac.mail.infomaniak.ch [83.166.143.172]) (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 03C6D6CBFD for ; Thu, 29 Feb 2024 17:04:36 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=83.166.143.172 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1709226279; cv=none; b=bJDP0Y82k/Lw/bYoez3xmRIQPmUDUZVVJmEA4yJuAYykwgU+A80nxCG+NYYmzl+tjOG2A60RLywlrEdTiVWHrWOQHZAEUMUUPHxl3NqZdnsKQmreTHYKqFHRme/uWqeYtgAgXDdifRwGisndmbXQSm5vP2VsWgcNielhUkRQ6nE= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1709226279; c=relaxed/simple; bh=Y3qACsJqLhysHNo72GvJJ9/ipSm5FWvUJD/HQrH2Nac=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=GdPDc7wjIfATecTxfpiyNtfZHdWr12I52jONM3xci++3z1GhtQJS5SIrS5aGMsjpY3kK74UKsGbAIdNEF1K3KQOKBglwfb8pwY3SbeGDftfFMIiFWFJU+64vbstGIFRsj5WAT6lFbQZLbRnntBBlPKlgIfTxDBdGTUMQVamoGVY= 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=I5diwHoF; arc=none smtp.client-ip=83.166.143.172 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="I5diwHoF" Received: from smtp-3-0001.mail.infomaniak.ch (unknown [10.4.36.108]) by smtp-3-3000.mail.infomaniak.ch (Postfix) with ESMTPS id 4TlyHx0XD1zMrkvK; Thu, 29 Feb 2024 18:04:29 +0100 (CET) Received: from unknown by smtp-3-0001.mail.infomaniak.ch (Postfix) with ESMTPA id 4TlyHw2tVRzMpnPj; Thu, 29 Feb 2024 18:04:28 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=digikod.net; s=20191114; t=1709226268; bh=Y3qACsJqLhysHNo72GvJJ9/ipSm5FWvUJD/HQrH2Nac=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=I5diwHoFMOe7e+VCX9Kpc4Al+7OLJ05syQxgO2eEWWeYFE3i8xxvjPFVksjKES4Ar RnEM/+1JzGqSBFIyaugTPitDZeybVukdsrcbU1APqTnUmUjFjQPZxwWwCDq4fU/Q2L IWKprJuZaq2OiK0trID+Wsx8+VnPmd7Z4Vh5Y+G0= 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 5/8] kunit: Handle test faults Date: Thu, 29 Feb 2024 18:04:06 +0100 Message-ID: <20240229170409.365386-6-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 Previously, when a kernel test thread crashed (e.g. NULL pointer dereference, general protection fault), the KUnit test hanged for 30 seconds and exited with a timeout error. Fix this issue by waiting on task_struct->vfork_done instead of the custom kunit_try_catch.try_completion, and track the execution state by initially setting try_result with -EFAULT and only setting it to 0 if the test passed. Fix kunit_generic_run_threadfn_adapter() signature by returning 0 instead of calling kthread_complete_and_exit(). Because thread's exit code is never checked, always set it to 0 to make it clear. Fix the -EINTR error message, which couldn't be reached until now. This is tested with a following patch. Cc: Brendan Higgins Cc: David Gow Cc: Rae Moar Cc: Shuah Khan Signed-off-by: Mickaël Salaün Reviewed-by: Kees Cook --- include/kunit/try-catch.h | 3 --- lib/kunit/try-catch.c | 14 +++++++------- 2 files changed, 7 insertions(+), 10 deletions(-) diff --git a/include/kunit/try-catch.h b/include/kunit/try-catch.h index c507dd43119d..7c966a1adbd3 100644 --- a/include/kunit/try-catch.h +++ b/include/kunit/try-catch.h @@ -14,13 +14,11 @@ typedef void (*kunit_try_catch_func_t)(void *); -struct completion; struct kunit; /** * struct kunit_try_catch - provides a generic way to run code which might fail. * @test: The test case that is currently being executed. - * @try_completion: Completion that the control thread waits on while test runs. * @try_result: Contains any errno obtained while running test case. * @try: The function, the test case, to attempt to run. * @catch: The function called if @try bails out. @@ -46,7 +44,6 @@ struct kunit; struct kunit_try_catch { /* private: internal use only. */ struct kunit *test; - struct completion *try_completion; int try_result; kunit_try_catch_func_t try; kunit_try_catch_func_t catch; diff --git a/lib/kunit/try-catch.c b/lib/kunit/try-catch.c index cab8b24b5d5a..c6ee4db0b3bd 100644 --- a/lib/kunit/try-catch.c +++ b/lib/kunit/try-catch.c @@ -18,7 +18,7 @@ void __noreturn kunit_try_catch_throw(struct kunit_try_catch *try_catch) { try_catch->try_result = -EFAULT; - kthread_complete_and_exit(try_catch->try_completion, -EFAULT); + kthread_exit(0); } EXPORT_SYMBOL_GPL(kunit_try_catch_throw); @@ -26,9 +26,12 @@ static int kunit_generic_run_threadfn_adapter(void *data) { struct kunit_try_catch *try_catch = data; + try_catch->try_result = -EINTR; try_catch->try(try_catch->context); + if (try_catch->try_result == -EINTR) + try_catch->try_result = 0; - kthread_complete_and_exit(try_catch->try_completion, 0); + return 0; } static unsigned long kunit_test_timeout(void) @@ -58,13 +61,11 @@ static unsigned long kunit_test_timeout(void) void kunit_try_catch_run(struct kunit_try_catch *try_catch, void *context) { - DECLARE_COMPLETION_ONSTACK(try_completion); struct kunit *test = try_catch->test; struct task_struct *task_struct; int exit_code, time_remaining; try_catch->context = context; - try_catch->try_completion = &try_completion; try_catch->try_result = 0; task_struct = kthread_create(kunit_generic_run_threadfn_adapter, try_catch, "kunit_try_catch_thread"); @@ -75,8 +76,7 @@ void kunit_try_catch_run(struct kunit_try_catch *try_catch, void *context) } get_task_struct(task_struct); wake_up_process(task_struct); - - time_remaining = wait_for_completion_timeout(&try_completion, + time_remaining = wait_for_completion_timeout(task_struct->vfork_done, kunit_test_timeout()); if (time_remaining == 0) { try_catch->try_result = -ETIMEDOUT; @@ -92,7 +92,7 @@ void kunit_try_catch_run(struct kunit_try_catch *try_catch, void *context) if (exit_code == -EFAULT) try_catch->try_result = 0; else if (exit_code == -EINTR) - kunit_err(test, "wake_up_process() was never called\n"); + kunit_err(test, "try faulted\n"); else if (exit_code == -ETIMEDOUT) kunit_err(test, "try timed out\n"); else if (exit_code)