From patchwork Tue Mar 27 01:55:22 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Igor Stoppa X-Patchwork-Id: 10309117 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 7BE9B600CC for ; Tue, 27 Mar 2018 01:57:23 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 6CA71299DD for ; Tue, 27 Mar 2018 01:57:23 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 611E1299DF; Tue, 27 Mar 2018 01:57:23 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-4.2 required=2.0 tests=BAYES_00, RCVD_IN_DNSWL_MED autolearn=ham version=3.3.1 Received: from mother.openwall.net (mother.openwall.net [195.42.179.200]) by mail.wl.linuxfoundation.org (Postfix) with SMTP id 3E67B299DD for ; Tue, 27 Mar 2018 01:57:21 +0000 (UTC) Received: (qmail 22400 invoked by uid 550); 27 Mar 2018 01:57:20 -0000 Mailing-List: contact kernel-hardening-help@lists.openwall.com; run by ezmlm Precedence: bulk List-Post: List-Help: List-Unsubscribe: List-Subscribe: List-ID: Delivered-To: mailing list kernel-hardening@lists.openwall.com Received: (qmail 22379 invoked from network); 27 Mar 2018 01:57:19 -0000 From: Igor Stoppa To: , , CC: , , , , , , , , Igor Stoppa Subject: [PATCH 4/6] Pmalloc selftest Date: Tue, 27 Mar 2018 04:55:22 +0300 Message-ID: <20180327015524.14318-5-igor.stoppa@huawei.com> X-Mailer: git-send-email 2.14.1 In-Reply-To: <20180327015524.14318-1-igor.stoppa@huawei.com> References: <20180327015524.14318-1-igor.stoppa@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.122.225.51] X-CFilter-Loop: Reflected X-Virus-Scanned: ClamAV using ClamSMTP Add basic self-test functionality for pmalloc. The testing is introduced as early as possible, right after the main dependency, genalloc, has passed successfully, so that it can help diagnosing failures in pmalloc users. Signed-off-by: Igor Stoppa --- include/linux/test_pmalloc.h | 24 ++++++++ init/main.c | 2 + mm/Kconfig | 10 ++++ mm/Makefile | 1 + mm/test_pmalloc.c | 136 +++++++++++++++++++++++++++++++++++++++++++ 5 files changed, 173 insertions(+) create mode 100644 include/linux/test_pmalloc.h create mode 100644 mm/test_pmalloc.c diff --git a/include/linux/test_pmalloc.h b/include/linux/test_pmalloc.h new file mode 100644 index 000000000000..c7e2e451c17c --- /dev/null +++ b/include/linux/test_pmalloc.h @@ -0,0 +1,24 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * test_pmalloc.h + * + * (C) Copyright 2018 Huawei Technologies Co. Ltd. + * Author: Igor Stoppa + */ + + +#ifndef __LINUX_TEST_PMALLOC_H +#define __LINUX_TEST_PMALLOC_H + + +#ifdef CONFIG_TEST_PROTECTABLE_MEMORY + +void test_pmalloc(void); + +#else + +static inline void test_pmalloc(void){}; + +#endif + +#endif diff --git a/init/main.c b/init/main.c index 21efbf6ace93..c63c41a33c9b 100644 --- a/init/main.c +++ b/init/main.c @@ -90,6 +90,7 @@ #include #include #include +#include #include #include @@ -661,6 +662,7 @@ asmlinkage __visible void __init start_kernel(void) */ mem_encrypt_init(); + test_pmalloc(); #ifdef CONFIG_BLK_DEV_INITRD if (initrd_start && !initrd_below_start_ok && page_to_pfn(virt_to_page((void *)initrd_start)) < min_low_pfn) { diff --git a/mm/Kconfig b/mm/Kconfig index 1ac1dfc60c22..246f66c7e694 100644 --- a/mm/Kconfig +++ b/mm/Kconfig @@ -766,3 +766,13 @@ config PROTECTABLE_MEMORY depends on MMU depends on ARCH_HAS_SET_MEMORY default y + +config TEST_PROTECTABLE_MEMORY + bool "Run self test for pmalloc memory allocator" + depends on MMU + depends on ARCH_HAS_SET_MEMORY + select PROTECTABLE_MEMORY + default n + help + Tries to verify that pmalloc works correctly and that the memory + is effectively protected. diff --git a/mm/Makefile b/mm/Makefile index 959fdbdac118..1de4be5fd0bc 100644 --- a/mm/Makefile +++ b/mm/Makefile @@ -66,6 +66,7 @@ obj-$(CONFIG_SPARSEMEM_VMEMMAP) += sparse-vmemmap.o obj-$(CONFIG_SLOB) += slob.o obj-$(CONFIG_MMU_NOTIFIER) += mmu_notifier.o obj-$(CONFIG_PROTECTABLE_MEMORY) += pmalloc.o +obj-$(CONFIG_TEST_PROTECTABLE_MEMORY) += test_pmalloc.o obj-$(CONFIG_KSM) += ksm.o obj-$(CONFIG_PAGE_POISONING) += page_poison.o obj-$(CONFIG_SLAB) += slab.o diff --git a/mm/test_pmalloc.c b/mm/test_pmalloc.c new file mode 100644 index 000000000000..08274b0324f9 --- /dev/null +++ b/mm/test_pmalloc.c @@ -0,0 +1,136 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * test_pmalloc.c + * + * (C) Copyright 2018 Huawei Technologies Co. Ltd. + * Author: Igor Stoppa + */ + +#include +#include +#include +#include + +#define SIZE_1 (PAGE_SIZE * 3) +#define SIZE_2 1000 + + +/* wrapper for is_pmalloc_object() with messages */ +static inline bool validate_alloc(bool expected, void *addr, + unsigned long size) +{ + bool test; + + test = is_pmalloc_object(addr, size) > 0; + pr_notice("must be %s: %s", + expected ? "ok" : "no", test ? "ok" : "no"); + return test == expected; +} + + +#define is_alloc_ok(variable, size) \ + validate_alloc(true, variable, size) + + +#define is_alloc_no(variable, size) \ + validate_alloc(false, variable, size) + +/* tests the basic life-cycle of a pool */ +static bool create_and_destroy_pool(void) +{ + static struct pmalloc_pool *pool; + + pr_notice("Testing pool creation and destruction capability"); + + pool = pmalloc_create_pool(); + if (WARN(!pool, "Cannot allocate memory for pmalloc selftest.")) + return false; + pmalloc_destroy_pool(pool); + return true; +} + + +/* verifies that it's possible to allocate from the pool */ +static bool test_alloc(void) +{ + static struct pmalloc_pool *pool; + static void *p; + + pr_notice("Testing allocation capability"); + pool = pmalloc_create_pool(); + if (WARN(!pool, "Unable to allocate memory for pmalloc selftest.")) + return false; + p = pmalloc(pool, SIZE_1 - 1); + pmalloc_protect_pool(pool); + pmalloc_destroy_pool(pool); + if (WARN(!p, "Failed to allocate memory from the pool")) + return false; + return true; +} + + +/* tests the identification of pmalloc ranges */ +static bool test_is_pmalloc_object(void) +{ + struct pmalloc_pool *pool; + void *pmalloc_p; + void *vmalloc_p; + bool retval = false; + + pr_notice("Test correctness of is_pmalloc_object()"); + + vmalloc_p = vmalloc(SIZE_1); + if (WARN(!vmalloc_p, + "Unable to allocate memory for pmalloc selftest.")) + return false; + pool = pmalloc_create_pool(); + if (WARN(!pool, "Unable to allocate memory for pmalloc selftest.")) + return false; + pmalloc_p = pmalloc(pool, SIZE_1 - 1); + if (WARN(!pmalloc_p, "Failed to allocate memory from the pool")) + goto error; + if (WARN_ON(unlikely(!is_alloc_ok(pmalloc_p, 10))) || + WARN_ON(unlikely(!is_alloc_ok(pmalloc_p, SIZE_1))) || + WARN_ON(unlikely(!is_alloc_ok(pmalloc_p, PAGE_SIZE))) || + WARN_ON(unlikely(!is_alloc_no(pmalloc_p, SIZE_1 + 1))) || + WARN_ON(unlikely(!is_alloc_no(vmalloc_p, 10)))) + goto error; + retval = true; +error: + pmalloc_protect_pool(pool); + pmalloc_destroy_pool(pool); + return retval; +} + +/* Test out of virtually contiguous memory */ +static void test_oovm(void) +{ + struct pmalloc_pool *pool; + int i; + + pr_notice("Exhaust vmalloc memory with doubling allocations."); + pool = pmalloc_create_pool(); + if (WARN(!pool, "Failed to create pool")) + return; + for (i = 1; i; i *= 2) + if (unlikely(!pzalloc(pool, i - 1))) + break; + pr_notice("vmalloc oom at %d allocation", i - 1); + pmalloc_protect_pool(pool); + pmalloc_destroy_pool(pool); +} + +/** + * test_pmalloc() -main entry point for running the test cases + */ +void test_pmalloc(void) +{ + + pr_notice("pmalloc-selftest"); + + if (unlikely(!(create_and_destroy_pool() && + test_alloc() && + test_is_pmalloc_object()))) + return; + test_oovm(); +}