kmsan: add tests for KMSAN
The testing module triggers KMSAN warnings in different cases and checks that the errors are properly reported, using console probes to capture the tool's output. Link: https://lkml.kernel.org/r/20220915150417.722975-25-glider@google.com Signed-off-by: Alexander Potapenko <glider@google.com> Cc: Alexander Viro <viro@zeniv.linux.org.uk> Cc: Alexei Starovoitov <ast@kernel.org> Cc: Andrey Konovalov <andreyknvl@gmail.com> Cc: Andrey Konovalov <andreyknvl@google.com> Cc: Andy Lutomirski <luto@kernel.org> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Borislav Petkov <bp@alien8.de> Cc: Christoph Hellwig <hch@lst.de> Cc: Christoph Lameter <cl@linux.com> Cc: David Rientjes <rientjes@google.com> Cc: Dmitry Vyukov <dvyukov@google.com> Cc: Eric Biggers <ebiggers@google.com> Cc: Eric Biggers <ebiggers@kernel.org> Cc: Eric Dumazet <edumazet@google.com> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Herbert Xu <herbert@gondor.apana.org.au> Cc: Ilya Leoshkevich <iii@linux.ibm.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: Jens Axboe <axboe@kernel.dk> Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com> Cc: Kees Cook <keescook@chromium.org> Cc: Marco Elver <elver@google.com> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Matthew Wilcox <willy@infradead.org> Cc: Michael S. Tsirkin <mst@redhat.com> Cc: Pekka Enberg <penberg@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Petr Mladek <pmladek@suse.com> Cc: Stephen Rothwell <sfr@canb.auug.org.au> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Vasily Gorbik <gor@linux.ibm.com> Cc: Vegard Nossum <vegard.nossum@oracle.com> Cc: Vlastimil Babka <vbabka@suse.cz> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Alexander Potapenko
Andrew Morton
Родитель
553a80188a
Коммит
8ed691b02a
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@ -47,4 +47,16 @@ config KMSAN_CHECK_PARAM_RETVAL
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may potentially report errors in corner cases when non-instrumented
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functions call instrumented ones.
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config KMSAN_KUNIT_TEST
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tristate "KMSAN integration test suite" if !KUNIT_ALL_TESTS
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default KUNIT_ALL_TESTS
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depends on TRACEPOINTS && KUNIT
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help
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Test suite for KMSAN, testing various error detection scenarios,
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and checking that reports are correctly output to console.
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Say Y here if you want the test to be built into the kernel and run
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during boot; say M if you want the test to build as a module; say N
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if you are unsure.
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endif
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@ -22,3 +22,7 @@ CFLAGS_init.o := $(CC_FLAGS_KMSAN_RUNTIME)
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CFLAGS_instrumentation.o := $(CC_FLAGS_KMSAN_RUNTIME)
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CFLAGS_report.o := $(CC_FLAGS_KMSAN_RUNTIME)
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CFLAGS_shadow.o := $(CC_FLAGS_KMSAN_RUNTIME)
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obj-$(CONFIG_KMSAN_KUNIT_TEST) += kmsan_test.o
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KMSAN_SANITIZE_kmsan_test.o := y
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CFLAGS_kmsan_test.o += $(call cc-disable-warning, uninitialized)
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@ -0,0 +1,581 @@
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// SPDX-License-Identifier: GPL-2.0
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/*
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* Test cases for KMSAN.
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* For each test case checks the presence (or absence) of generated reports.
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* Relies on 'console' tracepoint to capture reports as they appear in the
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* kernel log.
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*
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* Copyright (C) 2021-2022, Google LLC.
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* Author: Alexander Potapenko <glider@google.com>
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*
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*/
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#include <kunit/test.h>
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#include "kmsan.h"
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#include <linux/jiffies.h>
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#include <linux/kernel.h>
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#include <linux/kmsan.h>
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#include <linux/mm.h>
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#include <linux/random.h>
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#include <linux/slab.h>
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#include <linux/spinlock.h>
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#include <linux/string.h>
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#include <linux/tracepoint.h>
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#include <trace/events/printk.h>
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static DEFINE_PER_CPU(int, per_cpu_var);
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/* Report as observed from console. */
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static struct {
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spinlock_t lock;
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bool available;
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bool ignore; /* Stop console output collection. */
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char header[256];
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} observed = {
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.lock = __SPIN_LOCK_UNLOCKED(observed.lock),
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};
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/* Probe for console output: obtains observed lines of interest. */
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static void probe_console(void *ignore, const char *buf, size_t len)
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{
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unsigned long flags;
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if (observed.ignore)
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return;
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spin_lock_irqsave(&observed.lock, flags);
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if (strnstr(buf, "BUG: KMSAN: ", len)) {
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/*
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* KMSAN report and related to the test.
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*
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* The provided @buf is not NUL-terminated; copy no more than
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* @len bytes and let strscpy() add the missing NUL-terminator.
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*/
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strscpy(observed.header, buf,
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min(len + 1, sizeof(observed.header)));
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WRITE_ONCE(observed.available, true);
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observed.ignore = true;
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}
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spin_unlock_irqrestore(&observed.lock, flags);
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}
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/* Check if a report related to the test exists. */
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static bool report_available(void)
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{
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return READ_ONCE(observed.available);
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}
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/* Information we expect in a report. */
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struct expect_report {
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const char *error_type; /* Error type. */
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/*
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* Kernel symbol from the error header, or NULL if no report is
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* expected.
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*/
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const char *symbol;
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};
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/* Check observed report matches information in @r. */
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static bool report_matches(const struct expect_report *r)
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{
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typeof(observed.header) expected_header;
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unsigned long flags;
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bool ret = false;
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const char *end;
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char *cur;
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/* Doubled-checked locking. */
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if (!report_available() || !r->symbol)
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return (!report_available() && !r->symbol);
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/* Generate expected report contents. */
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/* Title */
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cur = expected_header;
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end = &expected_header[sizeof(expected_header) - 1];
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cur += scnprintf(cur, end - cur, "BUG: KMSAN: %s", r->error_type);
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scnprintf(cur, end - cur, " in %s", r->symbol);
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/* The exact offset won't match, remove it; also strip module name. */
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cur = strchr(expected_header, '+');
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if (cur)
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*cur = '\0';
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spin_lock_irqsave(&observed.lock, flags);
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if (!report_available())
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goto out; /* A new report is being captured. */
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/* Finally match expected output to what we actually observed. */
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ret = strstr(observed.header, expected_header);
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out:
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spin_unlock_irqrestore(&observed.lock, flags);
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return ret;
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}
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/* ===== Test cases ===== */
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/* Prevent replacing branch with select in LLVM. */
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static noinline void check_true(char *arg)
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{
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pr_info("%s is true\n", arg);
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}
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static noinline void check_false(char *arg)
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{
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pr_info("%s is false\n", arg);
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}
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#define USE(x) \
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do { \
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if (x) \
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check_true(#x); \
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else \
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check_false(#x); \
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} while (0)
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#define EXPECTATION_ETYPE_FN(e, reason, fn) \
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struct expect_report e = { \
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.error_type = reason, \
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.symbol = fn, \
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}
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#define EXPECTATION_NO_REPORT(e) EXPECTATION_ETYPE_FN(e, NULL, NULL)
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#define EXPECTATION_UNINIT_VALUE_FN(e, fn) \
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EXPECTATION_ETYPE_FN(e, "uninit-value", fn)
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#define EXPECTATION_UNINIT_VALUE(e) EXPECTATION_UNINIT_VALUE_FN(e, __func__)
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#define EXPECTATION_USE_AFTER_FREE(e) \
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EXPECTATION_ETYPE_FN(e, "use-after-free", __func__)
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/* Test case: ensure that kmalloc() returns uninitialized memory. */
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static void test_uninit_kmalloc(struct kunit *test)
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{
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EXPECTATION_UNINIT_VALUE(expect);
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int *ptr;
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kunit_info(test, "uninitialized kmalloc test (UMR report)\n");
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ptr = kmalloc(sizeof(*ptr), GFP_KERNEL);
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USE(*ptr);
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KUNIT_EXPECT_TRUE(test, report_matches(&expect));
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}
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/*
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* Test case: ensure that kmalloc'ed memory becomes initialized after memset().
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*/
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static void test_init_kmalloc(struct kunit *test)
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{
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EXPECTATION_NO_REPORT(expect);
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int *ptr;
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kunit_info(test, "initialized kmalloc test (no reports)\n");
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ptr = kmalloc(sizeof(*ptr), GFP_KERNEL);
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memset(ptr, 0, sizeof(*ptr));
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USE(*ptr);
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KUNIT_EXPECT_TRUE(test, report_matches(&expect));
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}
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/* Test case: ensure that kzalloc() returns initialized memory. */
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static void test_init_kzalloc(struct kunit *test)
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{
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EXPECTATION_NO_REPORT(expect);
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int *ptr;
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kunit_info(test, "initialized kzalloc test (no reports)\n");
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ptr = kzalloc(sizeof(*ptr), GFP_KERNEL);
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USE(*ptr);
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KUNIT_EXPECT_TRUE(test, report_matches(&expect));
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}
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/* Test case: ensure that local variables are uninitialized by default. */
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static void test_uninit_stack_var(struct kunit *test)
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{
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EXPECTATION_UNINIT_VALUE(expect);
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volatile int cond;
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kunit_info(test, "uninitialized stack variable (UMR report)\n");
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USE(cond);
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KUNIT_EXPECT_TRUE(test, report_matches(&expect));
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}
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/* Test case: ensure that local variables with initializers are initialized. */
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static void test_init_stack_var(struct kunit *test)
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{
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EXPECTATION_NO_REPORT(expect);
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volatile int cond = 1;
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kunit_info(test, "initialized stack variable (no reports)\n");
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USE(cond);
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KUNIT_EXPECT_TRUE(test, report_matches(&expect));
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}
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static noinline void two_param_fn_2(int arg1, int arg2)
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{
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USE(arg1);
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USE(arg2);
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}
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static noinline void one_param_fn(int arg)
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{
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two_param_fn_2(arg, arg);
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USE(arg);
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}
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static noinline void two_param_fn(int arg1, int arg2)
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{
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int init = 0;
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one_param_fn(init);
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USE(arg1);
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USE(arg2);
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}
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static void test_params(struct kunit *test)
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{
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#ifdef CONFIG_KMSAN_CHECK_PARAM_RETVAL
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/*
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* With eager param/retval checking enabled, KMSAN will report an error
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* before the call to two_param_fn().
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*/
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EXPECTATION_UNINIT_VALUE_FN(expect, "test_params");
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#else
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EXPECTATION_UNINIT_VALUE_FN(expect, "two_param_fn");
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#endif
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volatile int uninit, init = 1;
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kunit_info(test,
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"uninit passed through a function parameter (UMR report)\n");
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two_param_fn(uninit, init);
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KUNIT_EXPECT_TRUE(test, report_matches(&expect));
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}
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static int signed_sum3(int a, int b, int c)
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{
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return a + b + c;
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}
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/*
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* Test case: ensure that uninitialized values are tracked through function
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* arguments.
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*/
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static void test_uninit_multiple_params(struct kunit *test)
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{
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EXPECTATION_UNINIT_VALUE(expect);
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volatile char b = 3, c;
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volatile int a;
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kunit_info(test, "uninitialized local passed to fn (UMR report)\n");
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USE(signed_sum3(a, b, c));
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KUNIT_EXPECT_TRUE(test, report_matches(&expect));
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}
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/* Helper function to make an array uninitialized. */
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static noinline void do_uninit_local_array(char *array, int start, int stop)
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{
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volatile char uninit;
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for (int i = start; i < stop; i++)
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array[i] = uninit;
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}
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/*
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* Test case: ensure kmsan_check_memory() reports an error when checking
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* uninitialized memory.
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*/
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static void test_uninit_kmsan_check_memory(struct kunit *test)
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{
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EXPECTATION_UNINIT_VALUE_FN(expect, "test_uninit_kmsan_check_memory");
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volatile char local_array[8];
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kunit_info(
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test,
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"kmsan_check_memory() called on uninit local (UMR report)\n");
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do_uninit_local_array((char *)local_array, 5, 7);
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kmsan_check_memory((char *)local_array, 8);
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KUNIT_EXPECT_TRUE(test, report_matches(&expect));
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}
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/*
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* Test case: check that a virtual memory range created with vmap() from
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* initialized pages is still considered as initialized.
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*/
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static void test_init_kmsan_vmap_vunmap(struct kunit *test)
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{
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EXPECTATION_NO_REPORT(expect);
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const int npages = 2;
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struct page **pages;
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void *vbuf;
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kunit_info(test, "pages initialized via vmap (no reports)\n");
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pages = kmalloc_array(npages, sizeof(*pages), GFP_KERNEL);
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for (int i = 0; i < npages; i++)
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pages[i] = alloc_page(GFP_KERNEL);
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vbuf = vmap(pages, npages, VM_MAP, PAGE_KERNEL);
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memset(vbuf, 0xfe, npages * PAGE_SIZE);
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for (int i = 0; i < npages; i++)
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kmsan_check_memory(page_address(pages[i]), PAGE_SIZE);
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if (vbuf)
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vunmap(vbuf);
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for (int i = 0; i < npages; i++) {
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if (pages[i])
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__free_page(pages[i]);
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}
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kfree(pages);
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KUNIT_EXPECT_TRUE(test, report_matches(&expect));
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}
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/*
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* Test case: ensure that memset() can initialize a buffer allocated via
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* vmalloc().
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*/
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static void test_init_vmalloc(struct kunit *test)
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{
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EXPECTATION_NO_REPORT(expect);
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int npages = 8;
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char *buf;
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kunit_info(test, "vmalloc buffer can be initialized (no reports)\n");
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buf = vmalloc(PAGE_SIZE * npages);
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buf[0] = 1;
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memset(buf, 0xfe, PAGE_SIZE * npages);
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USE(buf[0]);
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for (int i = 0; i < npages; i++)
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kmsan_check_memory(&buf[PAGE_SIZE * i], PAGE_SIZE);
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vfree(buf);
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KUNIT_EXPECT_TRUE(test, report_matches(&expect));
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}
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/* Test case: ensure that use-after-free reporting works. */
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static void test_uaf(struct kunit *test)
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{
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EXPECTATION_USE_AFTER_FREE(expect);
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volatile int value;
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volatile int *var;
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kunit_info(test, "use-after-free in kmalloc-ed buffer (UMR report)\n");
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var = kmalloc(80, GFP_KERNEL);
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var[3] = 0xfeedface;
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kfree((int *)var);
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/* Copy the invalid value before checking it. */
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value = var[3];
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USE(value);
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KUNIT_EXPECT_TRUE(test, report_matches(&expect));
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}
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/*
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* Test case: ensure that uninitialized values are propagated through per-CPU
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* memory.
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*/
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static void test_percpu_propagate(struct kunit *test)
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{
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EXPECTATION_UNINIT_VALUE(expect);
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volatile int uninit, check;
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kunit_info(test,
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"uninit local stored to per_cpu memory (UMR report)\n");
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this_cpu_write(per_cpu_var, uninit);
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check = this_cpu_read(per_cpu_var);
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USE(check);
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KUNIT_EXPECT_TRUE(test, report_matches(&expect));
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}
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/*
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* Test case: ensure that passing uninitialized values to printk() leads to an
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* error report.
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*/
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static void test_printk(struct kunit *test)
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{
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#ifdef CONFIG_KMSAN_CHECK_PARAM_RETVAL
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/*
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* With eager param/retval checking enabled, KMSAN will report an error
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* before the call to pr_info().
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*/
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EXPECTATION_UNINIT_VALUE_FN(expect, "test_printk");
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#else
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EXPECTATION_UNINIT_VALUE_FN(expect, "number");
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#endif
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volatile int uninit;
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kunit_info(test, "uninit local passed to pr_info() (UMR report)\n");
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pr_info("%px contains %d\n", &uninit, uninit);
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KUNIT_EXPECT_TRUE(test, report_matches(&expect));
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}
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/*
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* Test case: ensure that memcpy() correctly copies uninitialized values between
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* aligned `src` and `dst`.
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*/
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static void test_memcpy_aligned_to_aligned(struct kunit *test)
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{
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EXPECTATION_UNINIT_VALUE_FN(expect, "test_memcpy_aligned_to_aligned");
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volatile int uninit_src;
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volatile int dst = 0;
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|
||||
kunit_info(
|
||||
test,
|
||||
"memcpy()ing aligned uninit src to aligned dst (UMR report)\n");
|
||||
memcpy((void *)&dst, (void *)&uninit_src, sizeof(uninit_src));
|
||||
kmsan_check_memory((void *)&dst, sizeof(dst));
|
||||
KUNIT_EXPECT_TRUE(test, report_matches(&expect));
|
||||
}
|
||||
|
||||
/*
|
||||
* Test case: ensure that memcpy() correctly copies uninitialized values between
|
||||
* aligned `src` and unaligned `dst`.
|
||||
*
|
||||
* Copying aligned 4-byte value to an unaligned one leads to touching two
|
||||
* aligned 4-byte values. This test case checks that KMSAN correctly reports an
|
||||
* error on the first of the two values.
|
||||
*/
|
||||
static void test_memcpy_aligned_to_unaligned(struct kunit *test)
|
||||
{
|
||||
EXPECTATION_UNINIT_VALUE_FN(expect, "test_memcpy_aligned_to_unaligned");
|
||||
volatile int uninit_src;
|
||||
volatile char dst[8] = { 0 };
|
||||
|
||||
kunit_info(
|
||||
test,
|
||||
"memcpy()ing aligned uninit src to unaligned dst (UMR report)\n");
|
||||
memcpy((void *)&dst[1], (void *)&uninit_src, sizeof(uninit_src));
|
||||
kmsan_check_memory((void *)dst, 4);
|
||||
KUNIT_EXPECT_TRUE(test, report_matches(&expect));
|
||||
}
|
||||
|
||||
/*
|
||||
* Test case: ensure that memcpy() correctly copies uninitialized values between
|
||||
* aligned `src` and unaligned `dst`.
|
||||
*
|
||||
* Copying aligned 4-byte value to an unaligned one leads to touching two
|
||||
* aligned 4-byte values. This test case checks that KMSAN correctly reports an
|
||||
* error on the second of the two values.
|
||||
*/
|
||||
static void test_memcpy_aligned_to_unaligned2(struct kunit *test)
|
||||
{
|
||||
EXPECTATION_UNINIT_VALUE_FN(expect,
|
||||
"test_memcpy_aligned_to_unaligned2");
|
||||
volatile int uninit_src;
|
||||
volatile char dst[8] = { 0 };
|
||||
|
||||
kunit_info(
|
||||
test,
|
||||
"memcpy()ing aligned uninit src to unaligned dst - part 2 (UMR report)\n");
|
||||
memcpy((void *)&dst[1], (void *)&uninit_src, sizeof(uninit_src));
|
||||
kmsan_check_memory((void *)&dst[4], sizeof(uninit_src));
|
||||
KUNIT_EXPECT_TRUE(test, report_matches(&expect));
|
||||
}
|
||||
|
||||
static noinline void fibonacci(int *array, int size, int start) {
|
||||
if (start < 2 || (start == size))
|
||||
return;
|
||||
array[start] = array[start - 1] + array[start - 2];
|
||||
fibonacci(array, size, start + 1);
|
||||
}
|
||||
|
||||
static void test_long_origin_chain(struct kunit *test)
|
||||
{
|
||||
EXPECTATION_UNINIT_VALUE_FN(expect,
|
||||
"test_long_origin_chain");
|
||||
/* (KMSAN_MAX_ORIGIN_DEPTH * 2) recursive calls to fibonacci(). */
|
||||
volatile int accum[KMSAN_MAX_ORIGIN_DEPTH * 2 + 2];
|
||||
int last = ARRAY_SIZE(accum) - 1;
|
||||
|
||||
kunit_info(
|
||||
test,
|
||||
"origin chain exceeding KMSAN_MAX_ORIGIN_DEPTH (UMR report)\n");
|
||||
/*
|
||||
* We do not set accum[1] to 0, so the uninitializedness will be carried
|
||||
* over to accum[2..last].
|
||||
*/
|
||||
accum[0] = 1;
|
||||
fibonacci((int *)accum, ARRAY_SIZE(accum), 2);
|
||||
kmsan_check_memory((void *)&accum[last], sizeof(int));
|
||||
KUNIT_EXPECT_TRUE(test, report_matches(&expect));
|
||||
}
|
||||
|
||||
static struct kunit_case kmsan_test_cases[] = {
|
||||
KUNIT_CASE(test_uninit_kmalloc),
|
||||
KUNIT_CASE(test_init_kmalloc),
|
||||
KUNIT_CASE(test_init_kzalloc),
|
||||
KUNIT_CASE(test_uninit_stack_var),
|
||||
KUNIT_CASE(test_init_stack_var),
|
||||
KUNIT_CASE(test_params),
|
||||
KUNIT_CASE(test_uninit_multiple_params),
|
||||
KUNIT_CASE(test_uninit_kmsan_check_memory),
|
||||
KUNIT_CASE(test_init_kmsan_vmap_vunmap),
|
||||
KUNIT_CASE(test_init_vmalloc),
|
||||
KUNIT_CASE(test_uaf),
|
||||
KUNIT_CASE(test_percpu_propagate),
|
||||
KUNIT_CASE(test_printk),
|
||||
KUNIT_CASE(test_memcpy_aligned_to_aligned),
|
||||
KUNIT_CASE(test_memcpy_aligned_to_unaligned),
|
||||
KUNIT_CASE(test_memcpy_aligned_to_unaligned2),
|
||||
KUNIT_CASE(test_long_origin_chain),
|
||||
{},
|
||||
};
|
||||
|
||||
/* ===== End test cases ===== */
|
||||
|
||||
static int test_init(struct kunit *test)
|
||||
{
|
||||
unsigned long flags;
|
||||
|
||||
spin_lock_irqsave(&observed.lock, flags);
|
||||
observed.header[0] = '\0';
|
||||
observed.ignore = false;
|
||||
observed.available = false;
|
||||
spin_unlock_irqrestore(&observed.lock, flags);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void test_exit(struct kunit *test)
|
||||
{
|
||||
}
|
||||
|
||||
static void register_tracepoints(struct tracepoint *tp, void *ignore)
|
||||
{
|
||||
check_trace_callback_type_console(probe_console);
|
||||
if (!strcmp(tp->name, "console"))
|
||||
WARN_ON(tracepoint_probe_register(tp, probe_console, NULL));
|
||||
}
|
||||
|
||||
static void unregister_tracepoints(struct tracepoint *tp, void *ignore)
|
||||
{
|
||||
if (!strcmp(tp->name, "console"))
|
||||
tracepoint_probe_unregister(tp, probe_console, NULL);
|
||||
}
|
||||
|
||||
static int kmsan_suite_init(struct kunit_suite *suite)
|
||||
{
|
||||
/*
|
||||
* Because we want to be able to build the test as a module, we need to
|
||||
* iterate through all known tracepoints, since the static registration
|
||||
* won't work here.
|
||||
*/
|
||||
for_each_kernel_tracepoint(register_tracepoints, NULL);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void kmsan_suite_exit(struct kunit_suite *suite)
|
||||
{
|
||||
for_each_kernel_tracepoint(unregister_tracepoints, NULL);
|
||||
tracepoint_synchronize_unregister();
|
||||
}
|
||||
|
||||
static struct kunit_suite kmsan_test_suite = {
|
||||
.name = "kmsan",
|
||||
.test_cases = kmsan_test_cases,
|
||||
.init = test_init,
|
||||
.exit = test_exit,
|
||||
.suite_init = kmsan_suite_init,
|
||||
.suite_exit = kmsan_suite_exit,
|
||||
};
|
||||
kunit_test_suites(&kmsan_test_suite);
|
||||
|
||||
MODULE_LICENSE("GPL");
|
||||
MODULE_AUTHOR("Alexander Potapenko <glider@google.com>");
|
||||
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