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R. Silva" , linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, kunit-dev@googlegroups.com, linux-hardening@vger.kernel.org Subject: [PATCH 1/2] kunit: test: Add vm_mmap() allocation resource manager Date: Sun, 19 May 2024 12:12:52 -0700 Message-Id: <20240519191254.651865-1-keescook@chromium.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240519190422.work.715-kees@kernel.org> References: <20240519190422.work.715-kees@kernel.org> Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=5613; i=keescook@chromium.org; h=from:subject; bh=wNgy2pm8z4ldp8MuPhDft19azofrU0oPWpTD6QjozZ8=; b=owEBbQKS/ZANAwAKAYly9N/cbcAmAcsmYgBmSk81T50rcpAOSlXL8bkcrTI2RR0tm5BAlNK8R nb+OGPQ79WJAjMEAAEKAB0WIQSlw/aPIp3WD3I+bhOJcvTf3G3AJgUCZkpPNQAKCRCJcvTf3G3A JjxFD/4iRIjfhVQa49n95Z2UAyf3e2Lfrswbx6Upw/fDRLSG4t8nNL3GIgdSQsX5z+KBR9b60V7 NHB11FzIrEz+3X/R1yyXhKOEqxuqUpYxFpZrKrMq+2nHE31wQCla7dm4bUr8ElF0Se3hhfH36Y2 V1tJGteFBLk9R92hEn585x+9T7x+ccGGxXe1NCiQAxEFVx/W+4pv2Z9AZqHz3g5nhpDOCd+w3Oz 4GgxYARWnJmm8++UZWpJnUMSjqT+1IgJiI/x9IpBPLTUhnFMxJ6lY+oNDyC4hAo65Onn8QHF5VV dpvwU/51JWdFElHHSE/O/BHJ18cmjrjn3/A8KB2NcPS0VO8kSIhdZdHPGkrWh5auZlKkAf5ts5h couc3iroXRwVk0eVeZ7U79OP6uSCwazjFIZwg4k05VMb96HlDy6jE3SAwRl1H3MT/XnrEhnTGjV C2o2MVd6BijHfJThjFmZAV3CozFe/JbrrLcqZf+How73xxhNFaJpUev+VYrLcJrI7FjLlpL4vqq aBfrxx9ubpcxw0cYZBMOWLR/K4J9+OdwsYsiNN6mmOBgLPRwmjXyqZZkPLi5dui0tA56L1T67Em 1tlDtSzaKYrxCATVeS6jZV43HFP6vXKMRVY1sIgsw82D/3iF1wOJBKpRbv+xxFSWIujmRB9Vrke wPLV3zAgTzm0YDg== X-Developer-Key: i=keescook@chromium.org; a=openpgp; fpr=A5C3F68F229DD60F723E6E138972F4DFDC6DC026 For tests that need to allocate using vm_mmap() (e.g. usercopy and execve), provide the interface to have the allocation tracked by KUnit itself. This requires bringing up a placeholder userspace mm. This combines my earlier attempt at this with Mark Rutland's version[1]. Link: https://lore.kernel.org/lkml/20230321122514.1743889-2-mark.rutland@arm.com/ [1] Co-developed-by: Mark Rutland Signed-off-by: Mark Rutland Signed-off-by: Kees Cook Reviewed-by: David Gow --- include/kunit/test.h | 17 ++++++ lib/kunit/test.c | 139 ++++++++++++++++++++++++++++++++++++++++++- 2 files changed, 155 insertions(+), 1 deletion(-) diff --git a/include/kunit/test.h b/include/kunit/test.h index 61637ef32302..8c3835a6f282 100644 --- a/include/kunit/test.h +++ b/include/kunit/test.h @@ -478,6 +478,23 @@ static inline void *kunit_kcalloc(struct kunit *test, size_t n, size_t size, gfp return kunit_kmalloc_array(test, n, size, gfp | __GFP_ZERO); } +/** + * kunit_vm_mmap() - Allocate KUnit-tracked vm_mmap() area + * @test: The test context object. + * @file: struct file pointer to map from, if any + * @addr: desired address, if any + * @len: how many bytes to allocate + * @prot: mmap PROT_* bits + * @flag: mmap flags + * @offset: offset into @file to start mapping from. + * + * See vm_mmap() for more information. + */ +unsigned long kunit_vm_mmap(struct kunit *test, struct file *file, + unsigned long addr, unsigned long len, + unsigned long prot, unsigned long flag, + unsigned long offset); + void kunit_cleanup(struct kunit *test); void __printf(2, 3) kunit_log_append(struct string_stream *log, const char *fmt, ...); diff --git a/lib/kunit/test.c b/lib/kunit/test.c index 1d1475578515..09194dbffb63 100644 --- a/lib/kunit/test.c +++ b/lib/kunit/test.c @@ -11,13 +11,14 @@ #include #include #include +#include +#include #include #include #include #include #include #include -#include #include "debugfs.h" #include "device-impl.h" @@ -871,6 +872,142 @@ void kunit_kfree(struct kunit *test, const void *ptr) } EXPORT_SYMBOL_GPL(kunit_kfree); +struct kunit_vm_mmap_resource { + unsigned long addr; + size_t size; +}; + +/* vm_mmap() arguments */ +struct kunit_vm_mmap_params { + struct file *file; + unsigned long addr; + unsigned long len; + unsigned long prot; + unsigned long flag; + unsigned long offset; +}; + +/* + * Arbitrarily chosen user address for the base allocation. + */ +#define UBUF_ADDR_BASE SZ_2M + +/* Create and attach a new mm if it doesn't already exist. */ +static int kunit_attach_mm(void) +{ + struct vm_area_struct *vma; + struct mm_struct *mm; + + if (current->mm) + return 0; + + mm = mm_alloc(); + if (!mm) + return -ENOMEM; + + if (mmap_write_lock_killable(mm)) + goto out_free; + + /* Define the task size. */ + mm->task_size = TASK_SIZE; + + /* Prepare the base VMA. */ + vma = vm_area_alloc(mm); + if (!vma) + goto out_unlock; + + vma_set_anonymous(vma); + vma->vm_start = UBUF_ADDR_BASE; + vma->vm_end = UBUF_ADDR_BASE + PAGE_SIZE; + vm_flags_init(vma, VM_READ | VM_MAYREAD | VM_WRITE | VM_MAYWRITE); + vma->vm_page_prot = vm_get_page_prot(vma->vm_flags); + + if (insert_vm_struct(mm, vma)) + goto out_free_vma; + + mmap_write_unlock(mm); + + /* Make sure we can allocate new VMAs. */ + arch_pick_mmap_layout(mm, ¤t->signal->rlim[RLIMIT_STACK]); + + /* Attach the mm. It will be cleaned up when the process dies. */ + kthread_use_mm(mm); + + return 0; + +out_free_vma: + vm_area_free(vma); +out_unlock: + mmap_write_unlock(mm); +out_free: + mmput(mm); + return -ENOMEM; +} + +static int kunit_vm_mmap_init(struct kunit_resource *res, void *context) +{ + struct kunit_vm_mmap_params *p = context; + struct kunit_vm_mmap_resource vres; + int ret; + + ret = kunit_attach_mm(); + if (ret) + return ret; + + vres.size = p->len; + vres.addr = vm_mmap(p->file, p->addr, p->len, p->prot, p->flag, p->offset); + if (!vres.addr) + return -ENOMEM; + res->data = kmemdup(&vres, sizeof(vres), GFP_KERNEL); + if (!res->data) { + vm_munmap(vres.addr, vres.size); + return -ENOMEM; + } + + return 0; +} + +static void kunit_vm_mmap_free(struct kunit_resource *res) +{ + struct kunit_vm_mmap_resource *vres = res->data; + + /* + * Since this is executed from the test monitoring process, + * the test's mm has already been torn down. We don't need + * to run vm_munmap(vres->addr, vres->size), only clean up + * the vres. + */ + + kfree(vres); + res->data = NULL; +} + +unsigned long kunit_vm_mmap(struct kunit *test, struct file *file, + unsigned long addr, unsigned long len, + unsigned long prot, unsigned long flag, + unsigned long offset) +{ + struct kunit_vm_mmap_params params = { + .file = file, + .addr = addr, + .len = len, + .prot = prot, + .flag = flag, + .offset = offset, + }; + struct kunit_vm_mmap_resource *vres; + + vres = kunit_alloc_resource(test, + kunit_vm_mmap_init, + kunit_vm_mmap_free, + GFP_KERNEL, + ¶ms); + if (vres) + return vres->addr; + return 0; +} +EXPORT_SYMBOL_GPL(kunit_vm_mmap); + void kunit_cleanup(struct kunit *test) { struct kunit_resource *res; From patchwork Sun May 19 19:12:53 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kees Cook X-Patchwork-Id: 797816 Received: from mail-pl1-f173.google.com (mail-pl1-f173.google.com [209.85.214.173]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id BD93170CC8 for ; Sun, 19 May 2024 19:12:57 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.214.173 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1716145980; cv=none; b=lh7lhMVTIOPs2cSWcXcS7SWnUgSjL/5elq3xu8GRRjieEQb8HQ4YK7S55kfMGaEYiHbwanRTcDreu0yEvqJNnSKX84C+OgxgtO/xLy2Yqf8nel5/ImU38cVnmcYb3ssVAyQBJSC47XXrU7QplilSrMnO7pM2IHBiimtj31A0r10= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1716145980; c=relaxed/simple; bh=L3h8oa5PuF64ydAhyvtrnNt2zd3Y7BV1STIA5ziEuy4=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=JT3avzakvg46DHiFV07M1IxxKJI7qDUkE32zT0RPXSdOF9aDqxkQgyjjzOjxFftRZKB9AKqtVNZmFFdY3w4bWRDYqPYkIBC6rqbumTOrEItQ1MqyoRGRz6jOFJmmzEuNXKyGpR8q7Hc2jOKM2P8tHaybZN3slMycQiv1KdtXTzI= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=chromium.org; spf=pass smtp.mailfrom=chromium.org; dkim=pass (1024-bit key) header.d=chromium.org header.i=@chromium.org header.b=ETKoaGUN; arc=none smtp.client-ip=209.85.214.173 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=chromium.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=chromium.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=chromium.org header.i=@chromium.org header.b="ETKoaGUN" Received: by mail-pl1-f173.google.com with SMTP id d9443c01a7336-1f0537e39b3so53329795ad.3 for ; Sun, 19 May 2024 12:12:57 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; t=1716145977; x=1716750777; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=UeeyyE3gX6k5WprMYxI3n5bPX4iwqcQoQPmK3gNObEY=; b=ETKoaGUNEzvyj+wuE5w/oFNYWRwkkpYbAKblJ9LL+nTrX6elwXYkZR6NYcH0XZNsie 4DNyGQZhQ2Uyj8U+XasnZKdI8QhbAtHi2wSBcieMjSuyGLYYOBydZ69PS6ZW3O9gACqU amiDidcMYFffY9wSPxz0dMNJZyjUk8qeJTJS8= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1716145977; x=1716750777; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=UeeyyE3gX6k5WprMYxI3n5bPX4iwqcQoQPmK3gNObEY=; b=WsljTQpYDTuDE8xijrUDCwufuyNUal146Y5ONdSKxNhlWd1H6zmy1/3QGFMhnqxCoG ZlOhIxBAd5kjiEn+JgY5CGPB9u2fSxyXIcp6qkN/SdtXKJos+t8XWBaWOm6NNPLXkSOM rQZl0xNwFNRdjjvWUa5iiaK1U0rYZcHz1lG6RGT1e31w12hDnf0g10itc6E+a00/Wh1I aKPEL9y4wZxSGr3Gwo0a3pPMd2gufPeNFV6vJ2ed/FKaFXsAjkkA8Rfl5dS+2w5E6PZc HG30ZhZ9KkJxid5hM/VkUZjFIM2MubybfpqghXytTQMOi556kNc52V3AjA8fPrr9QFYS LhUQ== X-Forwarded-Encrypted: i=1; AJvYcCXH8FPSUqImfnr5t9tXUOxy0w2wAc/TbeEY9xMN3bqq8U2hkQYlB9vFA/ZzB3/H4ZNLZhfeBOxXVtdtVSIMCyXllJ97nHGXnXnjJOui8uzV X-Gm-Message-State: AOJu0YzJ1wyBlrDG+zyj06bTGDQfCumhJMf312P4UKwBUdq31Axpng7c PJKXJzgfD3jGpWcoz2rGd+Okna/vYTkkwv+zvvMtfsWiPqmZmfQd580bsSeWHA== X-Google-Smtp-Source: AGHT+IFreHhHSGVxRSU86++JXmWMQpsYbCV+TgTtIOmhf7TZfSnPlz6zbN15mKv8Gz/zwDK3TJd/mg== X-Received: by 2002:a05:6a00:84c:b0:6ea:d794:ccee with SMTP id d2e1a72fcca58-6f4e02d3440mr32532750b3a.17.1716145976953; Sun, 19 May 2024 12:12:56 -0700 (PDT) Received: from www.outflux.net ([198.0.35.241]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-6f4fcb6e14asm13018700b3a.185.2024.05.19.12.12.55 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 19 May 2024 12:12:55 -0700 (PDT) From: Kees Cook To: Mark Rutland Cc: Kees Cook , Vitor Massaru Iha , Brendan Higgins , David Gow , Rae Moar , "Gustavo A. R. Silva" , linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, kunit-dev@googlegroups.com, linux-hardening@vger.kernel.org Subject: [PATCH 2/2] usercopy: Convert test_user_copy to KUnit test Date: Sun, 19 May 2024 12:12:53 -0700 Message-Id: <20240519191254.651865-2-keescook@chromium.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240519190422.work.715-kees@kernel.org> References: <20240519190422.work.715-kees@kernel.org> Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=17400; i=keescook@chromium.org; h=from:subject; bh=L3h8oa5PuF64ydAhyvtrnNt2zd3Y7BV1STIA5ziEuy4=; b=owEBbQKS/ZANAwAKAYly9N/cbcAmAcsmYgBmSk81NQe1zTzqSF+bUJl9MPcom8Y9lPfEWOsCd VHpme7cGs6JAjMEAAEKAB0WIQSlw/aPIp3WD3I+bhOJcvTf3G3AJgUCZkpPNQAKCRCJcvTf3G3A JrsoEACJPnLaQqg3I9bhQz6eEfywpl+56zmu3mDebBa78jlCep3WT5Bone7fwINqs3oxmlH8vmw OE8Hy9FrDj1/LQbVMla5+r7tbQhNPUWN57xfgXRIUQZj47kGTGtdnPk0eTeqouXA5ZJY7b+05hm IsBfAHmiZMRtqiZnYkwb2YA+algw07lJVa2DC2mcDY9HRymrUV3wxojoa7pJsq6Cy/Tj7xIYMtz Wl+oaSuHZMopExn+x0aaNuBNt5G13hQU9rbfehblTk6l0wKJhePAi1vqKniiVpG9ZB67MpEfE2t yVJDgViJ6EulzZGhbOfLxItLewr/Nrddoiw/0K3evtWasAcFfQJW7p0VZDjW3aFJodpXYt6FY+e MKvt+OuECJfaBzdyZNsR021YCy/2K2uTrwCbWfUGhIV1vKkaTjfW65tgyHg62d88NwRxNu5p2xy oUxY+DTI0ze0GpRFBRj25cKvMUd9BbYMCntvMcJVvsy6eaU6TMhqZL5bqh3QCx9jsAKo3QEehUR D9oax3InOG8oMjXvmH8ZdVdKRT4IwDOGfCYZdXusXLnnLU0am+uFqU37FDKNWfIKknDn6jgOnha 9lOvLacosmHTdDhGLlMLZvWkyuXgxl13qOEmVBhPyDKPrKzQ8FUcXLR3IJAsQzolmCSoWQSwpxx wjTfi6j0an1XIWA== X-Developer-Key: i=keescook@chromium.org; a=openpgp; fpr=A5C3F68F229DD60F723E6E138972F4DFDC6DC026 Convert the runtime tests of hardened usercopy to standard KUnit tests. Co-developed-by: Vitor Massaru Iha Signed-off-by: Vitor Massaru Iha Link: https://lore.kernel.org/r/20200721174654.72132-1-vitor@massaru.org Signed-off-by: Kees Cook Reviewed-by: David Gow --- MAINTAINERS | 1 + lib/Kconfig.debug | 21 +- lib/Makefile | 2 +- lib/{test_user_copy.c => usercopy_kunit.c} | 252 ++++++++++----------- 4 files changed, 133 insertions(+), 143 deletions(-) rename lib/{test_user_copy.c => usercopy_kunit.c} (52%) diff --git a/MAINTAINERS b/MAINTAINERS index 7c121493f43d..73995b807e5a 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -11761,6 +11761,7 @@ F: arch/*/configs/hardening.config F: include/linux/overflow.h F: include/linux/randomize_kstack.h F: kernel/configs/hardening.config +F: lib/usercopy_kunit.c F: mm/usercopy.c K: \b(add|choose)_random_kstack_offset\b K: \b__check_(object_size|heap_object)\b diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug index c63a5fbf1f1c..fd974480aa45 100644 --- a/lib/Kconfig.debug +++ b/lib/Kconfig.debug @@ -2460,18 +2460,6 @@ config TEST_VMALLOC If unsure, say N. -config TEST_USER_COPY - tristate "Test user/kernel boundary protections" - depends on m - help - This builds the "test_user_copy" module that runs sanity checks - on the copy_to/from_user infrastructure, making sure basic - user/kernel boundary testing is working. If it fails to load, - a regression has been detected in the user/kernel memory boundary - protections. - - If unsure, say N. - config TEST_BPF tristate "Test BPF filter functionality" depends on m && NET @@ -2779,6 +2767,15 @@ config SIPHASH_KUNIT_TEST This is intended to help people writing architecture-specific optimized versions. If unsure, say N. +config USERCOPY_KUNIT_TEST + tristate "KUnit Test for user/kernel boundary protections" + depends on KUNIT + default KUNIT_ALL_TESTS + help + This builds the "usercopy_kunit" module that runs sanity checks + on the copy_to/from_user infrastructure, making sure basic + user/kernel boundary testing is working. + config TEST_UDELAY tristate "udelay test driver" help diff --git a/lib/Makefile b/lib/Makefile index ffc6b2341b45..6287bd6be5d7 100644 --- a/lib/Makefile +++ b/lib/Makefile @@ -78,7 +78,6 @@ obj-$(CONFIG_TEST_LKM) += test_module.o obj-$(CONFIG_TEST_VMALLOC) += test_vmalloc.o obj-$(CONFIG_TEST_RHASHTABLE) += test_rhashtable.o obj-$(CONFIG_TEST_SORT) += test_sort.o -obj-$(CONFIG_TEST_USER_COPY) += test_user_copy.o obj-$(CONFIG_TEST_STATIC_KEYS) += test_static_keys.o obj-$(CONFIG_TEST_STATIC_KEYS) += test_static_key_base.o obj-$(CONFIG_TEST_DYNAMIC_DEBUG) += test_dynamic_debug.o @@ -406,6 +405,7 @@ obj-$(CONFIG_FORTIFY_KUNIT_TEST) += fortify_kunit.o obj-$(CONFIG_STRCAT_KUNIT_TEST) += strcat_kunit.o obj-$(CONFIG_STRSCPY_KUNIT_TEST) += strscpy_kunit.o obj-$(CONFIG_SIPHASH_KUNIT_TEST) += siphash_kunit.o +obj-$(CONFIG_USERCOPY_KUNIT_TEST) += usercopy_kunit.o obj-$(CONFIG_GENERIC_LIB_DEVMEM_IS_ALLOWED) += devmem_is_allowed.o diff --git a/lib/test_user_copy.c b/lib/usercopy_kunit.c similarity index 52% rename from lib/test_user_copy.c rename to lib/usercopy_kunit.c index 5ff04d8fe971..515df08b3190 100644 --- a/lib/test_user_copy.c +++ b/lib/usercopy_kunit.c @@ -15,7 +15,7 @@ #include #include #include -#include +#include /* * Several 32-bit architectures support 64-bit {get,put}_user() calls. @@ -31,11 +31,17 @@ # define TEST_U64 #endif +struct usercopy_test_priv { + char *kmem; + char __user *umem; + size_t size; +}; + #define test(condition, msg, ...) \ ({ \ int cond = (condition); \ if (cond) \ - pr_warn("[%d] " msg "\n", __LINE__, ##__VA_ARGS__); \ + KUNIT_EXPECT_FALSE_MSG(test, cond, msg, ##__VA_ARGS__); \ cond; \ }) @@ -44,13 +50,16 @@ static bool is_zeroed(void *from, size_t size) return memchr_inv(from, 0x0, size) == NULL; } -static int test_check_nonzero_user(char *kmem, char __user *umem, size_t size) +/* Test usage of check_nonzero_user(). */ +static void usercopy_test_check_nonzero_user(struct kunit *test) { - int ret = 0; size_t start, end, i, zero_start, zero_end; + struct usercopy_test_priv *priv = test->priv; + char __user *umem = priv->umem; + char *kmem = priv->kmem; + size_t size = priv->size; - if (test(size < 2 * PAGE_SIZE, "buffer too small")) - return -EINVAL; + KUNIT_ASSERT_GE_MSG(test, size, 2 * PAGE_SIZE, "buffer too small"); /* * We want to cross a page boundary to exercise the code more @@ -84,8 +93,8 @@ static int test_check_nonzero_user(char *kmem, char __user *umem, size_t size) for (i = zero_end; i < size; i += 2) kmem[i] = 0xff; - ret |= test(copy_to_user(umem, kmem, size), - "legitimate copy_to_user failed"); + KUNIT_EXPECT_EQ_MSG(test, copy_to_user(umem, kmem, size), 0, + "legitimate copy_to_user failed"); for (start = 0; start <= size; start++) { for (end = start; end <= size; end++) { @@ -93,35 +102,32 @@ static int test_check_nonzero_user(char *kmem, char __user *umem, size_t size) int retval = check_zeroed_user(umem + start, len); int expected = is_zeroed(kmem + start, len); - ret |= test(retval != expected, - "check_nonzero_user(=%d) != memchr_inv(=%d) mismatch (start=%zu, end=%zu)", - retval, expected, start, end); + KUNIT_EXPECT_EQ_MSG(test, retval, expected, + "check_nonzero_user(=%d) != memchr_inv(=%d) mismatch (start=%zu, end=%zu)", + retval, expected, start, end); } } - - return ret; } -static int test_copy_struct_from_user(char *kmem, char __user *umem, - size_t size) +/* Test usage of copy_struct_from_user(). */ +static void usercopy_test_copy_struct_from_user(struct kunit *test) { - int ret = 0; char *umem_src = NULL, *expected = NULL; + struct usercopy_test_priv *priv = test->priv; + char __user *umem = priv->umem; + char *kmem = priv->kmem; + size_t size = priv->size; size_t ksize, usize; - umem_src = kmalloc(size, GFP_KERNEL); - ret = test(umem_src == NULL, "kmalloc failed"); - if (ret) - goto out_free; + umem_src = kunit_kmalloc(test, size, GFP_KERNEL); + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, umem_src); - expected = kmalloc(size, GFP_KERNEL); - ret = test(expected == NULL, "kmalloc failed"); - if (ret) - goto out_free; + expected = kunit_kmalloc(test, size, GFP_KERNEL); + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, expected); /* Fill umem with a fixed byte pattern. */ memset(umem_src, 0x3e, size); - ret |= test(copy_to_user(umem, umem_src, size), + KUNIT_ASSERT_EQ_MSG(test, copy_to_user(umem, umem_src, size), 0, "legitimate copy_to_user failed"); /* Check basic case -- (usize == ksize). */ @@ -131,9 +137,9 @@ static int test_copy_struct_from_user(char *kmem, char __user *umem, memcpy(expected, umem_src, ksize); memset(kmem, 0x0, size); - ret |= test(copy_struct_from_user(kmem, ksize, umem, usize), + KUNIT_EXPECT_EQ_MSG(test, copy_struct_from_user(kmem, ksize, umem, usize), 0, "copy_struct_from_user(usize == ksize) failed"); - ret |= test(memcmp(kmem, expected, ksize), + KUNIT_EXPECT_EQ_MSG(test, memcmp(kmem, expected, ksize), 0, "copy_struct_from_user(usize == ksize) gives unexpected copy"); /* Old userspace case -- (usize < ksize). */ @@ -144,9 +150,9 @@ static int test_copy_struct_from_user(char *kmem, char __user *umem, memset(expected + usize, 0x0, ksize - usize); memset(kmem, 0x0, size); - ret |= test(copy_struct_from_user(kmem, ksize, umem, usize), + KUNIT_EXPECT_EQ_MSG(test, copy_struct_from_user(kmem, ksize, umem, usize), 0, "copy_struct_from_user(usize < ksize) failed"); - ret |= test(memcmp(kmem, expected, ksize), + KUNIT_EXPECT_EQ_MSG(test, memcmp(kmem, expected, ksize), 0, "copy_struct_from_user(usize < ksize) gives unexpected copy"); /* New userspace (-E2BIG) case -- (usize > ksize). */ @@ -154,7 +160,7 @@ static int test_copy_struct_from_user(char *kmem, char __user *umem, usize = size; memset(kmem, 0x0, size); - ret |= test(copy_struct_from_user(kmem, ksize, umem, usize) != -E2BIG, + KUNIT_EXPECT_EQ_MSG(test, copy_struct_from_user(kmem, ksize, umem, usize), -E2BIG, "copy_struct_from_user(usize > ksize) didn't give E2BIG"); /* New userspace (success) case -- (usize > ksize). */ @@ -162,78 +168,46 @@ static int test_copy_struct_from_user(char *kmem, char __user *umem, usize = size; memcpy(expected, umem_src, ksize); - ret |= test(clear_user(umem + ksize, usize - ksize), + KUNIT_EXPECT_EQ_MSG(test, clear_user(umem + ksize, usize - ksize), 0, "legitimate clear_user failed"); memset(kmem, 0x0, size); - ret |= test(copy_struct_from_user(kmem, ksize, umem, usize), + KUNIT_EXPECT_EQ_MSG(test, copy_struct_from_user(kmem, ksize, umem, usize), 0, "copy_struct_from_user(usize > ksize) failed"); - ret |= test(memcmp(kmem, expected, ksize), + KUNIT_EXPECT_EQ_MSG(test, memcmp(kmem, expected, ksize), 0, "copy_struct_from_user(usize > ksize) gives unexpected copy"); - -out_free: - kfree(expected); - kfree(umem_src); - return ret; } -static int __init test_user_copy_init(void) +/* + * Legitimate usage: none of these copies should fail. + */ +static void usercopy_test_valid(struct kunit *test) { - int ret = 0; - char *kmem; - char __user *usermem; - char *bad_usermem; - unsigned long user_addr; - u8 val_u8; - u16 val_u16; - u32 val_u32; -#ifdef TEST_U64 - u64 val_u64; -#endif - - kmem = kmalloc(PAGE_SIZE * 2, GFP_KERNEL); - if (!kmem) - return -ENOMEM; - - user_addr = vm_mmap(NULL, 0, PAGE_SIZE * 2, - PROT_READ | PROT_WRITE | PROT_EXEC, - MAP_ANONYMOUS | MAP_PRIVATE, 0); - if (user_addr >= (unsigned long)(TASK_SIZE)) { - pr_warn("Failed to allocate user memory\n"); - kfree(kmem); - return -ENOMEM; - } + struct usercopy_test_priv *priv = test->priv; + char __user *usermem = priv->umem; + char *kmem = priv->kmem; - usermem = (char __user *)user_addr; - bad_usermem = (char *)user_addr; - - /* - * Legitimate usage: none of these copies should fail. - */ memset(kmem, 0x3a, PAGE_SIZE * 2); - ret |= test(copy_to_user(usermem, kmem, PAGE_SIZE), - "legitimate copy_to_user failed"); + KUNIT_EXPECT_EQ_MSG(test, 0, copy_to_user(usermem, kmem, PAGE_SIZE), + "legitimate copy_to_user failed"); memset(kmem, 0x0, PAGE_SIZE); - ret |= test(copy_from_user(kmem, usermem, PAGE_SIZE), - "legitimate copy_from_user failed"); - ret |= test(memcmp(kmem, kmem + PAGE_SIZE, PAGE_SIZE), - "legitimate usercopy failed to copy data"); - -#define test_legit(size, check) \ - do { \ - val_##size = check; \ - ret |= test(put_user(val_##size, (size __user *)usermem), \ - "legitimate put_user (" #size ") failed"); \ - val_##size = 0; \ - ret |= test(get_user(val_##size, (size __user *)usermem), \ - "legitimate get_user (" #size ") failed"); \ - ret |= test(val_##size != check, \ - "legitimate get_user (" #size ") failed to do copy"); \ - if (val_##size != check) { \ - pr_info("0x%llx != 0x%llx\n", \ - (unsigned long long)val_##size, \ - (unsigned long long)check); \ - } \ + KUNIT_EXPECT_EQ_MSG(test, 0, copy_from_user(kmem, usermem, PAGE_SIZE), + "legitimate copy_from_user failed"); + KUNIT_EXPECT_EQ_MSG(test, 0, memcmp(kmem, kmem + PAGE_SIZE, PAGE_SIZE), + "legitimate usercopy failed to copy data"); + +#define test_legit(size, check) \ + do { \ + size val_##size = (check); \ + KUNIT_EXPECT_EQ_MSG(test, 0, \ + put_user(val_##size, (size __user *)usermem), \ + "legitimate put_user (" #size ") failed"); \ + val_##size = 0; \ + KUNIT_EXPECT_EQ_MSG(test, 0, \ + get_user(val_##size, (size __user *)usermem), \ + "legitimate get_user (" #size ") failed"); \ + KUNIT_EXPECT_EQ_MSG(test, val_##size, check, \ + "legitimate get_user (" #size ") failed to do copy"); \ } while (0) test_legit(u8, 0x5a); @@ -243,27 +217,29 @@ static int __init test_user_copy_init(void) test_legit(u64, 0x5a5b5c5d6a6b6c6d); #endif #undef test_legit +} - /* Test usage of check_nonzero_user(). */ - ret |= test_check_nonzero_user(kmem, usermem, 2 * PAGE_SIZE); - /* Test usage of copy_struct_from_user(). */ - ret |= test_copy_struct_from_user(kmem, usermem, 2 * PAGE_SIZE); - - /* - * Invalid usage: none of these copies should succeed. - */ +/* + * Invalid usage: none of these copies should succeed. + */ +static void usercopy_test_invalid(struct kunit *test) +{ + struct usercopy_test_priv *priv = test->priv; + char __user *usermem = priv->umem; + char *bad_usermem = (char *)usermem; + char *kmem = priv->kmem; /* Prepare kernel memory with check values. */ memset(kmem, 0x5a, PAGE_SIZE); memset(kmem + PAGE_SIZE, 0, PAGE_SIZE); /* Reject kernel-to-kernel copies through copy_from_user(). */ - ret |= test(!copy_from_user(kmem, (char __user *)(kmem + PAGE_SIZE), - PAGE_SIZE), + KUNIT_EXPECT_NE_MSG(test, copy_from_user(kmem, (char __user *)(kmem + PAGE_SIZE), + PAGE_SIZE), 0, "illegal all-kernel copy_from_user passed"); /* Destination half of buffer should have been zeroed. */ - ret |= test(memcmp(kmem + PAGE_SIZE, kmem, PAGE_SIZE), + KUNIT_EXPECT_EQ_MSG(test, memcmp(kmem + PAGE_SIZE, kmem, PAGE_SIZE), 0, "zeroing failure for illegal all-kernel copy_from_user"); #if 0 @@ -273,29 +249,25 @@ static int __init test_user_copy_init(void) * to be tested in LKDTM instead, since this test module does not * expect to explode. */ - ret |= test(!copy_from_user(bad_usermem, (char __user *)kmem, - PAGE_SIZE), + KUNIT_EXPECT_NE_MSG(test, copy_from_user(bad_usermem, (char __user *)kmem, + PAGE_SIZE), 0, "illegal reversed copy_from_user passed"); #endif - ret |= test(!copy_to_user((char __user *)kmem, kmem + PAGE_SIZE, - PAGE_SIZE), + KUNIT_EXPECT_NE_MSG(test, copy_to_user((char __user *)kmem, kmem + PAGE_SIZE, + PAGE_SIZE), 0, "illegal all-kernel copy_to_user passed"); - ret |= test(!copy_to_user((char __user *)kmem, bad_usermem, - PAGE_SIZE), + KUNIT_EXPECT_NE_MSG(test, copy_to_user((char __user *)kmem, bad_usermem, + PAGE_SIZE), 0, "illegal reversed copy_to_user passed"); #define test_illegal(size, check) \ do { \ - val_##size = (check); \ - ret |= test(!get_user(val_##size, (size __user *)kmem), \ + size val_##size = (check); \ + KUNIT_EXPECT_NE_MSG(test, get_user(val_##size, (size __user *)kmem), 0, \ "illegal get_user (" #size ") passed"); \ - ret |= test(val_##size != (size)0, \ + KUNIT_EXPECT_EQ_MSG(test, val_##size, 0, \ "zeroing failure for illegal get_user (" #size ")"); \ - if (val_##size != (size)0) { \ - pr_info("0x%llx != 0\n", \ - (unsigned long long)val_##size); \ - } \ - ret |= test(!put_user(val_##size, (size __user *)kmem), \ + KUNIT_EXPECT_NE_MSG(test, put_user(val_##size, (size __user *)kmem), 0, \ "illegal put_user (" #size ") passed"); \ } while (0) @@ -306,26 +278,46 @@ static int __init test_user_copy_init(void) test_illegal(u64, 0x5a5b5c5d6a6b6c6d); #endif #undef test_illegal +} - vm_munmap(user_addr, PAGE_SIZE * 2); - kfree(kmem); +static int usercopy_test_init(struct kunit *test) +{ + struct usercopy_test_priv *priv; + unsigned long user_addr; - if (ret == 0) { - pr_info("tests passed.\n"); - return 0; - } + priv = kunit_kzalloc(test, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + test->priv = priv; + priv->size = PAGE_SIZE * 2; - return -EINVAL; -} + priv->kmem = kunit_kmalloc(test, priv->size, GFP_KERNEL); + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, priv->kmem); -module_init(test_user_copy_init); + user_addr = kunit_vm_mmap(test, NULL, 0, priv->size, + PROT_READ | PROT_WRITE | PROT_EXEC, + MAP_ANONYMOUS | MAP_PRIVATE, 0); + KUNIT_ASSERT_LT_MSG(test, user_addr, (unsigned long)TASK_SIZE, + "Failed to allocate user memory"); + priv->umem = (char __user *)user_addr; -static void __exit test_user_copy_exit(void) -{ - pr_info("unloaded.\n"); + return 0; } -module_exit(test_user_copy_exit); - +static struct kunit_case usercopy_test_cases[] = { + KUNIT_CASE(usercopy_test_valid), + KUNIT_CASE(usercopy_test_invalid), + KUNIT_CASE(usercopy_test_check_nonzero_user), + KUNIT_CASE(usercopy_test_copy_struct_from_user), + {} +}; + +static struct kunit_suite usercopy_test_suite = { + .name = "usercopy", + .init = usercopy_test_init, + .test_cases = usercopy_test_cases, +}; + +kunit_test_suites(&usercopy_test_suite); MODULE_AUTHOR("Kees Cook "); MODULE_LICENSE("GPL");