From: glider@google.com
To: Vegard Nossum <vegard.nossum@oracle.com>,
Dmitry Vyukov <dvyukov@google.com>,
linux-mm@kvack.org
Cc: glider@google.com, viro@zeniv.linux.org.uk,
adilger.kernel@dilger.ca, akpm@linux-foundation.org,
andreyknvl@google.com, aryabinin@virtuozzo.com, luto@kernel.org,
ard.biesheuvel@linaro.org, arnd@arndb.de, hch@infradead.org,
hch@lst.de, darrick.wong@oracle.com, davem@davemloft.net,
dmitry.torokhov@gmail.com, ebiggers@google.com,
edumazet@google.com, ericvh@gmail.com,
gregkh@linuxfoundation.org, harry.wentland@amd.com,
herbert@gondor.apana.org.au, iii@linux.ibm.com, mingo@elte.hu,
jasowang@redhat.com, axboe@kernel.dk, m.szyprowski@samsung.com,
elver@google.com, mark.rutland@arm.com,
martin.petersen@oracle.com, schwidefsky@de.ibm.com,
willy@infradead.org, mst@redhat.com, monstr@monstr.eu,
pmladek@suse.com, cai@lca.pw, rdunlap@infradead.org,
robin.murphy@arm.com, sergey.senozhatsky@gmail.com,
rostedt@goodmis.org, tiwai@suse.com, tytso@mit.edu,
tglx@linutronix.de, gor@linux.ibm.com, wsa@the-dreams.de
Subject: [PATCH RFC v3 15/36] kmsan: add tests for KMSAN
Date: Fri, 22 Nov 2019 12:26:00 +0100 [thread overview]
Message-ID: <20191122112621.204798-16-glider@google.com> (raw)
In-Reply-To: <20191122112621.204798-1-glider@google.com>
The initial commit adds several tests that trigger KMSAN warnings in
simple cases.
To use, build the kernel with CONFIG_TEST_KMSAN and do
`insmod test_kmsan.ko`
Signed-off-by: Alexander Potapenko <glider@google.com>
To: Alexander Potapenko <glider@google.com>
Cc: Vegard Nossum <vegard.nossum@oracle.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: linux-mm@kvack.org
---
v2:
- added printk_test()
Change-Id: I287e86ae83a82b770f2baa46e5bbdce1dfa65195
---
lib/Makefile | 1 +
lib/test_kmsan.c | 231 +++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 232 insertions(+)
create mode 100644 lib/test_kmsan.c
diff --git a/lib/Makefile b/lib/Makefile
index 58a3e1b1a868..08fcb37499a0 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -65,6 +65,7 @@ CFLAGS_test_kasan.o += $(call cc-disable-warning, vla)
obj-$(CONFIG_TEST_UBSAN) += test_ubsan.o
CFLAGS_test_ubsan.o += $(call cc-disable-warning, vla)
UBSAN_SANITIZE_test_ubsan.o := y
+obj-$(CONFIG_TEST_KMSAN) += test_kmsan.o
obj-$(CONFIG_TEST_KSTRTOX) += test-kstrtox.o
obj-$(CONFIG_TEST_LIST_SORT) += test_list_sort.o
obj-$(CONFIG_TEST_LKM) += test_module.o
diff --git a/lib/test_kmsan.c b/lib/test_kmsan.c
new file mode 100644
index 000000000000..dcbe02adbdb0
--- /dev/null
+++ b/lib/test_kmsan.c
@@ -0,0 +1,231 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Module for testing KMSAN.
+ *
+ * Copyright (C) 2017-2019 Google LLC
+ * Author: Alexander Potapenko <glider@google.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+/*
+ * Tests below use noinline and volatile to work around compiler optimizations
+ * that may mask KMSAN bugs.
+ */
+#define pr_fmt(fmt) "kmsan test: %s : " fmt, __func__
+
+#include <linux/mm.h>
+#include <linux/module.h>
+#include <linux/printk.h>
+#include <linux/slab.h>
+#include <linux/kmsan-checks.h>
+
+#define CHECK(x) \
+ do { \
+ if (x) \
+ pr_info(#x " is true\n"); \
+ else \
+ pr_info(#x " is false\n"); \
+ } while (0)
+
+noinline void use_integer(int cond)
+{
+ CHECK(cond);
+}
+
+int signed_sum3(int a, int b, int c)
+{
+ return a + b + c;
+}
+
+noinline void uninit_kmalloc_test(void)
+{
+ int *ptr;
+
+ pr_info("-----------------------------\n");
+ pr_info("uninitialized kmalloc test (UMR report)\n");
+ ptr = kmalloc(sizeof(int), GFP_KERNEL);
+ pr_info("kmalloc returned %p\n", ptr);
+ CHECK(*ptr);
+}
+noinline void init_kmalloc_test(void)
+{
+ int *ptr;
+
+ pr_info("-----------------------------\n");
+ pr_info("initialized kmalloc test (no reports)\n");
+ ptr = kmalloc(sizeof(int), GFP_KERNEL);
+ memset(ptr, 0, sizeof(int));
+ pr_info("kmalloc returned %p\n", ptr);
+ CHECK(*ptr);
+}
+
+noinline void init_kzalloc_test(void)
+{
+ int *ptr;
+
+ pr_info("-----------------------------\n");
+ pr_info("initialized kzalloc test (no reports)\n");
+ ptr = kzalloc(sizeof(int), GFP_KERNEL);
+ pr_info("kzalloc returned %p\n", ptr);
+ CHECK(*ptr);
+}
+
+noinline void uninit_multiple_args_test(void)
+{
+ volatile int a;
+ volatile char b = 3, c;
+
+ pr_info("-----------------------------\n");
+ pr_info("uninitialized local passed to fn (UMR report)\n");
+ CHECK(signed_sum3(a, b, c));
+}
+
+noinline void uninit_stack_var_test(void)
+{
+ int cond;
+
+ pr_info("-----------------------------\n");
+ pr_info("uninitialized stack variable (UMR report)\n");
+ CHECK(cond);
+}
+
+noinline void init_stack_var_test(void)
+{
+ volatile int cond = 1;
+
+ pr_info("-----------------------------\n");
+ pr_info("initialized stack variable (no reports)\n");
+ CHECK(cond);
+}
+
+noinline void two_param_fn_2(int arg1, int arg2)
+{
+ CHECK(arg1);
+ CHECK(arg2);
+}
+
+noinline void one_param_fn(int arg)
+{
+ two_param_fn_2(arg, arg);
+ CHECK(arg);
+}
+
+noinline void two_param_fn(int arg1, int arg2)
+{
+ int init = 0;
+
+ one_param_fn(init);
+ CHECK(arg1);
+ CHECK(arg2);
+}
+
+void params_test(void)
+{
+ int uninit, init = 1;
+
+ two_param_fn(uninit, init);
+}
+
+noinline void do_uninit_local_array(char *array, int start, int stop)
+{
+ int i;
+ volatile char uninit;
+
+ for (i = start; i < stop; i++)
+ array[i] = uninit;
+}
+
+noinline void uninit_kmsan_check_memory_test(void)
+{
+ volatile char local_array[8];
+
+ pr_info("-----------------------------\n");
+ pr_info("kmsan_check_memory() called on uninit local (UMR report)\n");
+ do_uninit_local_array((char *)local_array, 5, 7);
+
+ kmsan_check_memory((char *)local_array, 8);
+}
+
+noinline void init_kmsan_vmap_vunmap_test(void)
+{
+ const int npages = 2;
+ struct page *pages[npages];
+ void *vbuf;
+ int i;
+
+ pr_info("-----------------------------\n");
+ pr_info("pages initialized via vmap (no reports)\n");
+
+ for (i = 0; i < npages; i++)
+ pages[i] = alloc_page(GFP_KERNEL);
+ vbuf = vmap(pages, npages, VM_MAP, PAGE_KERNEL);
+ memset(vbuf, 0xfe, npages * PAGE_SIZE);
+ for (i = 0; i < npages; i++)
+ kmsan_check_memory(page_address(pages[i]), PAGE_SIZE);
+
+ if (vbuf)
+ vunmap(vbuf);
+ for (i = 0; i < npages; i++)
+ if (pages[i])
+ __free_page(pages[i]);
+}
+
+noinline void init_vmalloc(void)
+{
+ char *buf;
+ int npages = 8, i;
+
+ pr_info("-----------------------------\n");
+ pr_info("pages initialized via vmap (no reports)\n");
+ buf = vmalloc(PAGE_SIZE * npages);
+ buf[0] = 1;
+ memset(buf, 0xfe, PAGE_SIZE * npages);
+ CHECK(buf[0]);
+ for (i = 0; i < npages; i++)
+ kmsan_check_memory(&buf[PAGE_SIZE * i], PAGE_SIZE);
+ vfree(buf);
+}
+
+noinline void uaf_test(void)
+{
+ volatile int *var;
+
+ pr_info("-----------------------------\n");
+ pr_info("use-after-free in kmalloc-ed buffer (UMR report)\n");
+ var = kmalloc(80, GFP_KERNEL);
+ var[3] = 0xfeedface;
+ kfree((int *)var);
+ CHECK(var[3]);
+}
+
+noinline void printk_test(void)
+{
+ volatile int uninit;
+
+ pr_info("-----------------------------\n");
+ pr_info("uninit local passed to pr_info() (UMR report)\n");
+ pr_info("%px contains %d\n", &uninit, uninit);
+}
+
+static noinline int __init kmsan_tests_init(void)
+{
+ uninit_kmalloc_test();
+ init_kmalloc_test();
+ init_kzalloc_test();
+ uninit_multiple_args_test();
+ uninit_stack_var_test();
+ init_stack_var_test();
+ uninit_kmsan_check_memory_test();
+ init_kmsan_vmap_vunmap_test();
+ init_vmalloc();
+ uaf_test();
+ printk_test();
+ return -EAGAIN;
+}
+
+module_init(kmsan_tests_init);
+MODULE_LICENSE("GPL");
--
2.24.0.432.g9d3f5f5b63-goog
next prev parent reply other threads:[~2019-11-22 11:27 UTC|newest]
Thread overview: 120+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-11-22 11:25 [PATCH RFC v3 00/36] Add KernelMemorySanitizer infrastructure glider
2019-11-22 11:25 ` [PATCH RFC v3 01/36] stackdepot: check depot_index before accessing the stack slab glider
2019-11-27 14:22 ` Marco Elver
2019-11-22 11:25 ` [PATCH RFC v3 02/36] stackdepot: build with -fno-builtin glider
2019-11-27 14:22 ` Marco Elver
2019-11-22 11:25 ` [PATCH RFC v3 03/36] kasan: stackdepot: move filter_irq_stacks() to stackdepot.c glider
2019-11-27 14:22 ` Marco Elver
2019-11-27 14:56 ` Alexander Potapenko
2019-11-22 11:25 ` [PATCH RFC v3 04/36] stackdepot: reserve 5 extra bits in depot_stack_handle_t glider
2019-11-27 14:23 ` Marco Elver
2019-11-22 11:25 ` [PATCH RFC v3 05/36] kmsan: add ReST documentation glider
2019-11-27 14:22 ` Marco Elver
2019-12-03 12:42 ` Alexander Potapenko
2019-11-22 11:25 ` [PATCH RFC v3 06/36] kmsan: gfp: introduce __GFP_NO_KMSAN_SHADOW glider
2019-11-27 14:48 ` Marco Elver
2019-12-03 12:57 ` Alexander Potapenko
2019-11-22 11:25 ` [PATCH RFC v3 07/36] kmsan: introduce __no_sanitize_memory and __SANITIZE_MEMORY__ glider
2019-11-28 13:13 ` Marco Elver
2019-11-29 16:09 ` Andrey Konovalov
2019-12-16 11:35 ` Alexander Potapenko
2019-11-22 11:25 ` [PATCH RFC v3 08/36] kmsan: reduce vmalloc space glider
2019-11-28 13:30 ` Marco Elver
2019-11-22 11:25 ` [PATCH RFC v3 09/36] kmsan: add KMSAN bits to struct page and struct task_struct glider
2019-11-28 13:44 ` Marco Elver
2019-11-28 14:05 ` Alexander Potapenko
2019-11-22 11:25 ` [PATCH RFC v3 10/36] kmsan: add KMSAN runtime glider
2019-11-24 19:44 ` Wolfram Sang
2019-11-25 9:14 ` Alexander Potapenko
2019-11-29 16:07 ` Marco Elver
2019-12-19 14:16 ` Alexander Potapenko
2019-12-02 15:39 ` Andrey Konovalov
2019-12-20 18:58 ` Alexander Potapenko
2019-12-03 14:34 ` Andrey Konovalov
2019-11-22 11:25 ` [PATCH RFC v3 11/36] kmsan: stackdepot: don't allocate KMSAN metadata for stackdepot glider
2019-11-29 14:52 ` Andrey Konovalov
2019-12-03 14:27 ` Alexander Potapenko
2019-11-22 11:25 ` [PATCH RFC v3 12/36] kmsan: define READ_ONCE_NOCHECK() glider
2019-12-02 10:03 ` Marco Elver
2019-12-03 12:45 ` Alexander Potapenko
2019-11-22 11:25 ` [PATCH RFC v3 13/36] kmsan: make READ_ONCE_TASK_STACK() return initialized values glider
2019-12-02 10:07 ` Marco Elver
2019-12-05 15:52 ` Alexander Potapenko
2019-11-22 11:25 ` [PATCH RFC v3 14/36] kmsan: x86: sync metadata pages on page fault glider
2019-11-22 11:26 ` glider [this message]
2019-11-29 14:14 ` [PATCH RFC v3 15/36] kmsan: add tests for KMSAN Andrey Konovalov
2019-12-05 14:30 ` Alexander Potapenko
2019-11-22 11:26 ` [PATCH RFC v3 16/36] crypto: kmsan: disable accelerated configs under KMSAN glider
2019-12-02 13:25 ` Marco Elver
2019-12-05 14:51 ` Alexander Potapenko
2019-11-22 11:26 ` [PATCH RFC v3 17/36] kmsan: x86: disable UNWINDER_ORC " glider
2019-12-02 13:30 ` Marco Elver
2019-11-22 11:26 ` [PATCH RFC v3 18/36] kmsan: disable LOCK_DEBUGGING_SUPPORT glider
2019-12-02 13:33 ` Marco Elver
2019-12-03 14:34 ` Alexander Potapenko
2019-12-03 15:00 ` Qian Cai
2019-12-03 15:14 ` Alexander Potapenko
2019-12-03 18:02 ` Qian Cai
2019-12-03 18:38 ` Steven Rostedt
2019-12-04 8:41 ` Alexander Potapenko
2019-12-04 12:22 ` Petr Mladek
2019-12-04 13:12 ` Qian Cai
2019-12-04 16:24 ` Alexander Potapenko
2019-12-04 18:03 ` Qian Cai
2019-11-22 11:26 ` [PATCH RFC v3 20/36] kmsan: x86: increase stack sizes in KMSAN builds glider
2019-12-02 14:31 ` Marco Elver
2019-11-22 11:26 ` [PATCH RFC v3 21/36] kmsan: disable KMSAN instrumentation for certain kernel parts glider
2019-11-29 15:07 ` Andrey Konovalov
2019-12-10 10:35 ` Alexander Potapenko
2019-12-10 12:38 ` Alexander Potapenko
2019-12-10 12:43 ` Qian Cai
2019-11-22 11:26 ` [PATCH RFC v3 22/36] kmsan: mm: call KMSAN hooks from SLUB code glider
2019-12-02 15:36 ` Marco Elver
2019-12-10 12:07 ` Alexander Potapenko
2019-11-22 11:26 ` [PATCH RFC v3 23/36] kmsan: call KMSAN hooks where needed glider
2019-11-26 10:17 ` Petr Mladek
2019-11-26 10:52 ` Alexander Potapenko
2019-11-29 16:21 ` Andrey Konovalov
2019-12-16 11:30 ` Alexander Potapenko
2019-11-22 11:26 ` [PATCH RFC v3 24/36] kmsan: disable instrumentation of certain functions glider
2019-11-29 14:59 ` Andrey Konovalov
2019-12-18 10:02 ` Alexander Potapenko
2019-11-22 11:26 ` [PATCH RFC v3 25/36] kmsan: unpoison |tlb| in arch_tlb_gather_mmu() glider
2019-11-29 15:08 ` Andrey Konovalov
2019-12-03 14:19 ` Alexander Potapenko
2019-11-22 11:26 ` [PATCH RFC v3 26/36] kmsan: use __msan_memcpy() where possible glider
2019-11-29 15:13 ` Andrey Konovalov
2019-12-05 15:46 ` Alexander Potapenko
2019-11-22 11:26 ` [PATCH RFC v3 27/36] kmsan: hooks for copy_to_user() and friends glider
2019-11-29 15:34 ` Andrey Konovalov
2019-12-05 16:00 ` Alexander Potapenko
2019-12-05 16:44 ` Andrey Konovalov
2019-12-11 14:22 ` Alexander Potapenko
2019-11-22 11:26 ` [PATCH RFC v3 28/36] kmsan: enable KMSAN builds glider
2019-11-29 15:55 ` Andrey Konovalov
2019-12-11 12:51 ` Alexander Potapenko
2019-11-22 11:26 ` [PATCH RFC v3 29/36] kmsan: handle /dev/[u]random glider
2019-11-22 11:26 ` [PATCH RFC v3 30/36] kmsan: virtio: check/unpoison scatterlist in vring_map_one_sg() glider
2019-11-22 11:26 ` [PATCH RFC v3 31/36] kmsan: disable strscpy() optimization under KMSAN glider
2019-12-02 15:51 ` Marco Elver
2019-12-02 16:23 ` Alexander Potapenko
2019-12-03 11:19 ` Alexander Potapenko
2019-12-03 11:24 ` Marco Elver
2019-12-03 11:27 ` Alexander Potapenko
2019-11-22 11:26 ` [PATCH RFC v3 32/36] kmsan: add iomap support glider
2019-12-03 12:50 ` Marco Elver
2019-12-03 14:07 ` Alexander Potapenko
2019-11-22 11:26 ` [PATCH RFC v3 33/36] kmsan: dma: unpoison memory mapped by dma_direct_map_page() glider
2019-11-22 11:26 ` [PATCH RFC v3 34/36] kmsan: disable physical page merging in biovec glider
2019-12-03 12:54 ` Marco Elver
2019-12-03 13:38 ` Alexander Potapenko
2019-11-22 11:26 ` [PATCH RFC v3 35/36] kmsan: ext4: skip block merging logic in ext4_mpage_readpages for KMSAN glider
2019-11-25 16:05 ` Robin Murphy
2019-11-25 17:03 ` Alexander Potapenko
2019-12-03 14:22 ` Marco Elver
2019-12-05 14:31 ` Alexander Potapenko
2019-11-22 11:26 ` [PATCH RFC v3 36/36] net: kasan: kmsan: support CONFIG_GENERIC_CSUM on x86, enable it for KASAN/KMSAN glider
2019-12-03 14:17 ` Marco Elver
2019-12-05 14:37 ` Alexander Potapenko
2019-11-29 14:39 ` [PATCH RFC v3 00/36] Add KernelMemorySanitizer infrastructure Marco Elver
2019-12-02 16:02 ` Alexander Potapenko
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