From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 B50FC158A04; Tue, 9 Jul 2024 11:22:11 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1720524131; cv=none; b=lkXK+AHBenMOcP5NovF38pkZAMbggKer1koTCFQR6jXmXIRwcsHtbV3dCCDo9258W+MgpUJZJy+Q46bhHfg1RALSijyL0igeq7Yf96uL8qfTsTSokhvv1d/4ch3ESVBkpYRJhfatZzRzWtOCwEepvaHO3mjCddtaRaN0KVHRilc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1720524131; c=relaxed/simple; bh=e9QTve1Y8l3L1Nr2sFuUUx+ftKrXf31mZDhtcnzaGfc=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=mCzEoADNf1ZPgdQGN4s4GIlkyVq0p089Bc+J2/W8K37GWmP5oGDsHXKKe0p1Vi+lZ6zAQNBLQnEtA4yhqpDp7MCq0cWo/KjDDY3Z+/rWSZfk3gYnVQQ0EkixjM0ejhPhoDwFaNTAE0OKonSbM611kaVtJ2f4UmMCjIbYokU2jjQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=aORWWBFU; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="aORWWBFU" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 012A9C32786; Tue, 9 Jul 2024 11:22:10 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1720524131; bh=e9QTve1Y8l3L1Nr2sFuUUx+ftKrXf31mZDhtcnzaGfc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=aORWWBFUA4Qmw+3DU7bXVSc7juEGCz+36t0dGmZnRPMMz7M4x1aI5zagWa5DoGNZI s+P+V9BLMWUtB/FAUt8ziFkJPtZRaSnTaFa2hzoKS8vwlA//ztLEuaS+IftYC5FX+H 5iMgipHGCHDGufDrKzA75BBwNL61e3uwF1ghOopE= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Brendan Higgins , "Eric W. Biederman" , Shuah Khan , Kees Cook , David Gow , Rae Moar , =?UTF-8?q?Micka=C3=ABl=20Sala=C3=BCn?= , Sasha Levin Subject: [PATCH 6.9 063/197] kunit: Handle test faults Date: Tue, 9 Jul 2024 13:08:37 +0200 Message-ID: <20240709110711.400342317@linuxfoundation.org> X-Mailer: git-send-email 2.45.2 In-Reply-To: <20240709110708.903245467@linuxfoundation.org> References: <20240709110708.903245467@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 6.9-stable review patch. If anyone has any objections, please let me know. ------------------ From: Mickaël Salaün [ Upstream commit 3a35c13007dea132a65f07de05c26b87837fadc2 ] 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 -EINTR 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. To make this explicit, export kthread_exit() for KUnit tests built as module. Fix the -EINTR error message, which couldn't be reached until now. This is tested with a following patch. Cc: Brendan Higgins Cc: Eric W. Biederman Cc: Shuah Khan Reviewed-by: Kees Cook Reviewed-by: David Gow Tested-by: Rae Moar Signed-off-by: Mickaël Salaün Link: https://lore.kernel.org/r/20240408074625.65017-5-mic@digikod.net Signed-off-by: Shuah Khan Signed-off-by: Sasha Levin --- include/kunit/try-catch.h | 3 --- kernel/kthread.c | 1 + lib/kunit/try-catch.c | 19 ++++++++++++------- 3 files changed, 13 insertions(+), 10 deletions(-) diff --git a/include/kunit/try-catch.h b/include/kunit/try-catch.h index c507dd43119d5..7c966a1adbd30 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/kernel/kthread.c b/kernel/kthread.c index c5e40830c1f2d..f7be976ff88af 100644 --- a/kernel/kthread.c +++ b/kernel/kthread.c @@ -315,6 +315,7 @@ void __noreturn kthread_exit(long result) kthread->result = result; do_exit(0); } +EXPORT_SYMBOL(kthread_exit); /** * kthread_complete_and_exit - Exit the current kthread. diff --git a/lib/kunit/try-catch.c b/lib/kunit/try-catch.c index 9c9e4dcf06d96..34d30a6f23054 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"); @@ -74,8 +75,12 @@ 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, + /* + * As for a vfork(2), task_struct->vfork_done (pointing to the + * underlying kthread->exited) can be used to wait for the end of a + * kernel thread. + */ + time_remaining = wait_for_completion_timeout(task_struct->vfork_done, kunit_test_timeout()); if (time_remaining == 0) { try_catch->try_result = -ETIMEDOUT; @@ -91,7 +96,7 @@ 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) -- 2.43.0