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From: Andrey Konovalov <andreyknvl@google.com>
To: Alexander Potapenko <glider@google.com>
Cc: Vegard Nossum <vegard.nossum@oracle.com>,
	Dmitry Vyukov <dvyukov@google.com>,
	 Linux Memory Management List <linux-mm@kvack.org>,
	Alexander Viro <viro@zeniv.linux.org.uk>,
	 Andreas Dilger <adilger.kernel@dilger.ca>,
	Andrew Morton <akpm@linux-foundation.org>,
	 Andrey Ryabinin <aryabinin@virtuozzo.com>,
	Andy Lutomirski <luto@kernel.org>,
	 Ard Biesheuvel <ard.biesheuvel@linaro.org>,
	Arnd Bergmann <arnd@arndb.de>,
	 Christoph Hellwig <hch@infradead.org>,
	Christoph Hellwig <hch@lst.de>,
	darrick.wong@oracle.com,  "David S. Miller" <davem@davemloft.net>,
	Dmitry Torokhov <dmitry.torokhov@gmail.com>,
	ebiggers@google.com,  Eric Dumazet <edumazet@google.com>,
	ericvh@gmail.com,
	 Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	harry.wentland@amd.com,  Herbert Xu <herbert@gondor.apana.org.au>,
	iii@linux.ibm.com, mingo@elte.hu,
	 Jason Wang <jasowang@redhat.com>,
	axboe@kernel.dk,  Marek Szyprowski <m.szyprowski@samsung.com>,
	Marco Elver <elver@google.com>,
	 Mark Rutland <mark.rutland@arm.com>,
	"Martin K. Petersen" <martin.petersen@oracle.com>,
	 Martin Schwidefsky <schwidefsky@de.ibm.com>,
	Matthew Wilcox <willy@infradead.org>,
	 "Michael S . Tsirkin" <mst@redhat.com>,
	Michal Simek <monstr@monstr.eu>,
	pmladek@suse.com,  Qian Cai <cai@lca.pw>,
	Randy Dunlap <rdunlap@infradead.org>,
	Robin Murphy <robin.murphy@arm.com>,
	 sergey.senozhatsky@gmail.com,
	Steven Rostedt <rostedt@goodmis.org>,
	 Takashi Iwai <tiwai@suse.com>, "Theodore Ts'o" <tytso@mit.edu>,
	Thomas Gleixner <tglx@linutronix.de>,
	gor@linux.ibm.com,  wsa@the-dreams.de
Subject: Re: [PATCH RFC v3 15/36] kmsan: add tests for KMSAN
Date: Fri, 29 Nov 2019 15:14:57 +0100
Message-ID: <CAAeHK+xXUkbe=TzP33WtZ+tfbtcM+yo2rS7wroEa3tY9Qm9LDw@mail.gmail.com> (raw)
In-Reply-To: <20191122112621.204798-16-glider@google.com>

On Fri, Nov 22, 2019 at 12:27 PM <glider@google.com> wrote:
>
> 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);
> +}

This function seems to be unused.

> +
> +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);
> +}

This one as well.

> +
> +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();

Perhaps s/init_vmalloc/init_vmalloc_test?

> +       uaf_test();
> +       printk_test();
> +       return -EAGAIN;
> +}
> +
> +module_init(kmsan_tests_init);
> +MODULE_LICENSE("GPL");
> --
> 2.24.0.432.g9d3f5f5b63-goog
>


  reply index

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 ` [PATCH RFC v3 15/36] kmsan: add tests for KMSAN glider
2019-11-29 14:14   ` Andrey Konovalov [this message]
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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