From patchwork Fri Aug 6 00:17:04 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jarkko Sakkinen X-Patchwork-Id: 12422409 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-19.7 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 98466C432BE for ; Fri, 6 Aug 2021 00:17:36 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 7A46361168 for ; Fri, 6 Aug 2021 00:17:36 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237079AbhHFARu (ORCPT ); Thu, 5 Aug 2021 20:17:50 -0400 Received: from mail.kernel.org ([198.145.29.99]:42026 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S242720AbhHFARq (ORCPT ); Thu, 5 Aug 2021 20:17:46 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 01F0261165; Fri, 6 Aug 2021 00:17:30 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1628209051; bh=pBCuRbKWqZ8VXzwKr9l8E31otOpcFW6kulIyrKJFcrw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=jUehiHdmaPA4C/NIvnesCu3Gp1aHv1JldJmON5ZbydPiryo2C0/M4F9mXoZ3gEo6s cAnvPkoulXUt9/KztN3VtMTPQuiSfcUaljmN+fldTXWjZQxAIvHYy0/EAwodIB+ohR 568lNt2P2jEaLHttaQTLAniDS3vdCnJ23XCqLwItr7jQI0M1fQjfJ/64HP6KQojTPQ 0fxpoZZ9c+dvPukzXjpZAB52Pq65YC21VZydGYOdmIvXQK/KObB3XsXkELCyVEk4TY QZvAa8ApLED7U8ZK90plKM4F9Q8U3+6dOAAgV06f5teBRFisUhW8JXjBIGRAdlgKvA IyF1ONYzhfyKQ== From: Jarkko Sakkinen To: Shuah Khan Cc: linux-kselftest@vger.kernel.org, linux-sgx@vger.kernel.org, Reinette Chatre , Borislav Petkov , Jarkko Sakkinen , Dave Hansen , linux-kernel@vger.kernel.org Subject: [PATCH v3 8/8] selftests/sgx: Add a new kselftest: unclobbered_vdso_oversubscribed Date: Fri, 6 Aug 2021 03:17:04 +0300 Message-Id: <20210806001704.667889-9-jarkko@kernel.org> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20210806001704.667889-1-jarkko@kernel.org> References: <20210806001704.667889-1-jarkko@kernel.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-sgx@vger.kernel.org Add a variation of the unclobbered_vdso test. In the new test, create a heap for the test enclave, which has the same size as all available Enclave Page Cache (EPC) pages in the system. This will guarantee that all test_encl.elf pages *and* SGX Enclave Control Structure (SECS) have been swapped out by the page reclaimer during the load time.. This test will trigger both the page reclaimer and the page fault handler. The page reclaimer triggered, while the heap is being created during the load time. The page fault handler is triggered for all the required pages, while the test case is executing. Signed-off-by: Jarkko Sakkinen --- tools/testing/selftests/sgx/main.c | 62 ++++++++++++++++++++++++++++++ tools/testing/selftests/sgx/main.h | 1 + 2 files changed, 63 insertions(+) diff --git a/tools/testing/selftests/sgx/main.c b/tools/testing/selftests/sgx/main.c index f219768b4e9a..3be34c3db74a 100644 --- a/tools/testing/selftests/sgx/main.c +++ b/tools/testing/selftests/sgx/main.c @@ -246,6 +246,68 @@ TEST_F(enclave, unclobbered_vdso) EXPECT_EQ(self->run.user_data, 0); } +static bool sysfs_get_ulong(const char *path, unsigned long *value) +{ + struct stat sbuf; + char buf[128]; + ssize_t ret; + int fd; + + ret = stat(path, &sbuf); + if (ret) + return false; + + fd = open(path, O_RDONLY); + if (fd < 0) + return false; + + ret = read(fd, buf, sizeof(buf)); + if (ret < 0) { + close(fd); + return false; + } + + errno = 0; + *value = strtoul(buf, NULL, 0); + + close(fd); + + return errno ? false : true; +} + +TEST_F(enclave, unclobbered_vdso_oversubscribed) +{ + unsigned long total_mem; + struct encl_op op; + + if (!sysfs_get_ulong(SGX_TOTAL_MEM_PATH, &total_mem)) + ASSERT_TRUE(false); + + if (!setup_test_encl(total_mem, &self->encl, _metadata)) + ASSERT_TRUE(false); + + memset(&self->run, 0, sizeof(self->run)); + self->run.tcs = self->encl.encl_base; + + op.type = ENCL_OP_PUT; + op.buffer = MAGIC; + + EXPECT_EQ(ENCL_CALL(&op, &self->run, false), 0); + + EXPECT_EEXIT(&self->run); + EXPECT_EQ(self->run.user_data, 0); + + op.type = ENCL_OP_GET; + op.buffer = 0; + + EXPECT_EQ(ENCL_CALL(&op, &self->run, false), 0); + + EXPECT_EQ(op.buffer, MAGIC); + EXPECT_EEXIT(&self->run); + EXPECT_EQ(self->run.user_data, 0); + +} + TEST_F(enclave, clobbered_vdso) { struct encl_op op; diff --git a/tools/testing/selftests/sgx/main.h b/tools/testing/selftests/sgx/main.h index b45c52ec7ab3..dd7767364107 100644 --- a/tools/testing/selftests/sgx/main.h +++ b/tools/testing/selftests/sgx/main.h @@ -7,6 +7,7 @@ #define MAIN_H #define ENCL_HEAP_SIZE_DEFAULT 4096 +#define SGX_TOTAL_MEM_PATH "/sys/kernel/debug/x86/sgx_total_mem" struct encl_segment { void *src;