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1613 lines
51 KiB
1613 lines
51 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* KCSAN test with various race scenarious to test runtime behaviour. Since the |
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* interface with which KCSAN's reports are obtained is via the console, this is |
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* the output we should verify. For each test case checks the presence (or |
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* absence) of generated reports. Relies on 'console' tracepoint to capture |
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* reports as they appear in the kernel log. |
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* |
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* Makes use of KUnit for test organization, and the Torture framework for test |
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* thread control. |
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* |
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* Copyright (C) 2020, Google LLC. |
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* Author: Marco Elver <[email protected]> |
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*/ |
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|
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#define pr_fmt(fmt) "kcsan_test: " fmt |
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|
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#include <kunit/test.h> |
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#include <linux/atomic.h> |
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#include <linux/bitops.h> |
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#include <linux/jiffies.h> |
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#include <linux/kcsan-checks.h> |
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#include <linux/kernel.h> |
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#include <linux/mutex.h> |
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#include <linux/sched.h> |
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#include <linux/seqlock.h> |
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#include <linux/spinlock.h> |
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#include <linux/string.h> |
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#include <linux/timer.h> |
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#include <linux/torture.h> |
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#include <linux/tracepoint.h> |
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#include <linux/types.h> |
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#include <trace/events/printk.h> |
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|
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#define KCSAN_TEST_REQUIRES(test, cond) do { \ |
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if (!(cond)) \ |
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kunit_skip((test), "Test requires: " #cond); \ |
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} while (0) |
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|
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#ifdef CONFIG_CC_HAS_TSAN_COMPOUND_READ_BEFORE_WRITE |
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#define __KCSAN_ACCESS_RW(alt) (KCSAN_ACCESS_COMPOUND | KCSAN_ACCESS_WRITE) |
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#else |
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#define __KCSAN_ACCESS_RW(alt) (alt) |
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#endif |
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|
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/* Points to current test-case memory access "kernels". */ |
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static void (*access_kernels[2])(void); |
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|
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static struct task_struct **threads; /* Lists of threads. */ |
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static unsigned long end_time; /* End time of test. */ |
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|
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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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int nlines; |
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char lines[3][512]; |
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} observed = { |
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.lock = __SPIN_LOCK_UNLOCKED(observed.lock), |
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}; |
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|
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/* Setup test checking loop. */ |
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static __no_kcsan inline void |
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begin_test_checks(void (*func1)(void), void (*func2)(void)) |
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{ |
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kcsan_disable_current(); |
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|
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/* |
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* Require at least as long as KCSAN_REPORT_ONCE_IN_MS, to ensure at |
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* least one race is reported. |
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*/ |
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end_time = jiffies + msecs_to_jiffies(CONFIG_KCSAN_REPORT_ONCE_IN_MS + 500); |
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|
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/* Signal start; release potential initialization of shared data. */ |
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smp_store_release(&access_kernels[0], func1); |
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smp_store_release(&access_kernels[1], func2); |
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} |
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|
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/* End test checking loop. */ |
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static __no_kcsan inline bool |
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end_test_checks(bool stop) |
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{ |
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if (!stop && time_before(jiffies, end_time)) { |
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/* Continue checking */ |
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might_sleep(); |
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return false; |
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} |
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|
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kcsan_enable_current(); |
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return true; |
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} |
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|
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/* |
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* Probe for console output: checks if a race was reported, and obtains observed |
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* lines of interest. |
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*/ |
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__no_kcsan |
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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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int nlines; |
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|
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/* |
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* Note that KCSAN reports under a global lock, so we do not risk the |
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* possibility of having multiple reports interleaved. If that were the |
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* case, we'd expect tests to fail. |
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*/ |
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|
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spin_lock_irqsave(&observed.lock, flags); |
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nlines = observed.nlines; |
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|
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if (strnstr(buf, "BUG: KCSAN: ", len) && strnstr(buf, "test_", len)) { |
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/* |
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* KCSAN 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.lines[0], buf, min(len + 1, sizeof(observed.lines[0]))); |
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nlines = 1; |
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} else if ((nlines == 1 || nlines == 2) && strnstr(buf, "bytes by", len)) { |
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strscpy(observed.lines[nlines++], buf, min(len + 1, sizeof(observed.lines[0]))); |
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|
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if (strnstr(buf, "race at unknown origin", len)) { |
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if (WARN_ON(nlines != 2)) |
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goto out; |
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|
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/* No second line of interest. */ |
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strcpy(observed.lines[nlines++], "<none>"); |
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} |
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} |
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out: |
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WRITE_ONCE(observed.nlines, nlines); /* Publish new nlines. */ |
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spin_unlock_irqrestore(&observed.lock, flags); |
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} |
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|
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/* Check if a report related to the test exists. */ |
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__no_kcsan |
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static bool report_available(void) |
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{ |
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return READ_ONCE(observed.nlines) == ARRAY_SIZE(observed.lines); |
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} |
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|
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/* Report information we expect in a report. */ |
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struct expect_report { |
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/* Access information of both accesses. */ |
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struct { |
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void *fn; /* Function pointer to expected function of top frame. */ |
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void *addr; /* Address of access; unchecked if NULL. */ |
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size_t size; /* Size of access; unchecked if @addr is NULL. */ |
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int type; /* Access type, see KCSAN_ACCESS definitions. */ |
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} access[2]; |
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}; |
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|
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/* Check observed report matches information in @r. */ |
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__no_kcsan |
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static bool __report_matches(const struct expect_report *r) |
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{ |
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const bool is_assert = (r->access[0].type | r->access[1].type) & KCSAN_ACCESS_ASSERT; |
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bool ret = false; |
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unsigned long flags; |
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typeof(observed.lines) expect; |
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const char *end; |
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char *cur; |
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int i; |
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|
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/* Doubled-checked locking. */ |
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if (!report_available()) |
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return false; |
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|
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/* Generate expected report contents. */ |
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|
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/* Title */ |
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cur = expect[0]; |
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end = &expect[0][sizeof(expect[0]) - 1]; |
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cur += scnprintf(cur, end - cur, "BUG: KCSAN: %s in ", |
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is_assert ? "assert: race" : "data-race"); |
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if (r->access[1].fn) { |
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char tmp[2][64]; |
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int cmp; |
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|
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/* Expect lexographically sorted function names in title. */ |
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scnprintf(tmp[0], sizeof(tmp[0]), "%pS", r->access[0].fn); |
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scnprintf(tmp[1], sizeof(tmp[1]), "%pS", r->access[1].fn); |
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cmp = strcmp(tmp[0], tmp[1]); |
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cur += scnprintf(cur, end - cur, "%ps / %ps", |
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cmp < 0 ? r->access[0].fn : r->access[1].fn, |
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cmp < 0 ? r->access[1].fn : r->access[0].fn); |
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} else { |
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scnprintf(cur, end - cur, "%pS", r->access[0].fn); |
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/* The exact offset won't match, remove it. */ |
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cur = strchr(expect[0], '+'); |
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if (cur) |
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*cur = '\0'; |
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} |
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|
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/* Access 1 */ |
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cur = expect[1]; |
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end = &expect[1][sizeof(expect[1]) - 1]; |
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if (!r->access[1].fn) |
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cur += scnprintf(cur, end - cur, "race at unknown origin, with "); |
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|
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/* Access 1 & 2 */ |
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for (i = 0; i < 2; ++i) { |
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const int ty = r->access[i].type; |
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const char *const access_type = |
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(ty & KCSAN_ACCESS_ASSERT) ? |
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((ty & KCSAN_ACCESS_WRITE) ? |
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"assert no accesses" : |
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"assert no writes") : |
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((ty & KCSAN_ACCESS_WRITE) ? |
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((ty & KCSAN_ACCESS_COMPOUND) ? |
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"read-write" : |
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"write") : |
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"read"); |
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const bool is_atomic = (ty & KCSAN_ACCESS_ATOMIC); |
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const bool is_scoped = (ty & KCSAN_ACCESS_SCOPED); |
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const char *const access_type_aux = |
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(is_atomic && is_scoped) ? " (marked, reordered)" |
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: (is_atomic ? " (marked)" |
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: (is_scoped ? " (reordered)" : "")); |
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if (i == 1) { |
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/* Access 2 */ |
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cur = expect[2]; |
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end = &expect[2][sizeof(expect[2]) - 1]; |
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if (!r->access[1].fn) { |
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/* Dummy string if no second access is available. */ |
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strcpy(cur, "<none>"); |
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break; |
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} |
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} |
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cur += scnprintf(cur, end - cur, "%s%s to ", access_type, |
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access_type_aux); |
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if (r->access[i].addr) /* Address is optional. */ |
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cur += scnprintf(cur, end - cur, "0x%px of %zu bytes", |
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r->access[i].addr, r->access[i].size); |
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} |
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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.lines[0], expect[0]) && |
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/* Access info may appear in any order. */ |
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((strstr(observed.lines[1], expect[1]) && |
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strstr(observed.lines[2], expect[2])) || |
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(strstr(observed.lines[1], expect[2]) && |
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strstr(observed.lines[2], expect[1]))); |
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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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static __always_inline const struct expect_report * |
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__report_set_scoped(struct expect_report *r, int accesses) |
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{ |
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BUILD_BUG_ON(accesses > 3); |
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if (accesses & 1) |
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r->access[0].type |= KCSAN_ACCESS_SCOPED; |
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else |
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r->access[0].type &= ~KCSAN_ACCESS_SCOPED; |
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if (accesses & 2) |
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r->access[1].type |= KCSAN_ACCESS_SCOPED; |
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else |
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r->access[1].type &= ~KCSAN_ACCESS_SCOPED; |
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return r; |
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} |
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__no_kcsan |
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static bool report_matches_any_reordered(struct expect_report *r) |
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{ |
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return __report_matches(__report_set_scoped(r, 0)) || |
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__report_matches(__report_set_scoped(r, 1)) || |
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__report_matches(__report_set_scoped(r, 2)) || |
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__report_matches(__report_set_scoped(r, 3)); |
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} |
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#ifdef CONFIG_KCSAN_WEAK_MEMORY |
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/* Due to reordering accesses, any access may appear as "(reordered)". */ |
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#define report_matches report_matches_any_reordered |
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#else |
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#define report_matches __report_matches |
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#endif |
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|
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/* ===== Test kernels ===== */ |
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|
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static long test_sink; |
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static long test_var; |
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/* @test_array should be large enough to fall into multiple watchpoint slots. */ |
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static long test_array[3 * PAGE_SIZE / sizeof(long)]; |
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static struct { |
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long val[8]; |
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} test_struct; |
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static DEFINE_SEQLOCK(test_seqlock); |
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static DEFINE_SPINLOCK(test_spinlock); |
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static DEFINE_MUTEX(test_mutex); |
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|
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/* |
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* Helper to avoid compiler optimizing out reads, and to generate source values |
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* for writes. |
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*/ |
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__no_kcsan |
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static noinline void sink_value(long v) { WRITE_ONCE(test_sink, v); } |
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/* |
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* Generates a delay and some accesses that enter the runtime but do not produce |
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* data races. |
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*/ |
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static noinline void test_delay(int iter) |
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{ |
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while (iter--) |
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sink_value(READ_ONCE(test_sink)); |
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} |
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static noinline void test_kernel_read(void) { sink_value(test_var); } |
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static noinline void test_kernel_write(void) |
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{ |
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test_var = READ_ONCE_NOCHECK(test_sink) + 1; |
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} |
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static noinline void test_kernel_write_nochange(void) { test_var = 42; } |
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|
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/* Suffixed by value-change exception filter. */ |
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static noinline void test_kernel_write_nochange_rcu(void) { test_var = 42; } |
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static noinline void test_kernel_read_atomic(void) |
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{ |
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sink_value(READ_ONCE(test_var)); |
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} |
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static noinline void test_kernel_write_atomic(void) |
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{ |
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WRITE_ONCE(test_var, READ_ONCE_NOCHECK(test_sink) + 1); |
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} |
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|
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static noinline void test_kernel_atomic_rmw(void) |
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{ |
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/* Use builtin, so we can set up the "bad" atomic/non-atomic scenario. */ |
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__atomic_fetch_add(&test_var, 1, __ATOMIC_RELAXED); |
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} |
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__no_kcsan |
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static noinline void test_kernel_write_uninstrumented(void) { test_var++; } |
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|
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static noinline void test_kernel_data_race(void) { data_race(test_var++); } |
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static noinline void test_kernel_assert_writer(void) |
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{ |
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ASSERT_EXCLUSIVE_WRITER(test_var); |
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} |
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|
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static noinline void test_kernel_assert_access(void) |
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{ |
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ASSERT_EXCLUSIVE_ACCESS(test_var); |
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} |
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|
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#define TEST_CHANGE_BITS 0xff00ff00 |
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|
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static noinline void test_kernel_change_bits(void) |
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{ |
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if (IS_ENABLED(CONFIG_KCSAN_IGNORE_ATOMICS)) { |
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/* |
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* Avoid race of unknown origin for this test, just pretend they |
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* are atomic. |
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*/ |
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kcsan_nestable_atomic_begin(); |
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test_var ^= TEST_CHANGE_BITS; |
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kcsan_nestable_atomic_end(); |
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} else |
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WRITE_ONCE(test_var, READ_ONCE(test_var) ^ TEST_CHANGE_BITS); |
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} |
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|
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static noinline void test_kernel_assert_bits_change(void) |
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{ |
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ASSERT_EXCLUSIVE_BITS(test_var, TEST_CHANGE_BITS); |
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} |
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|
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static noinline void test_kernel_assert_bits_nochange(void) |
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{ |
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ASSERT_EXCLUSIVE_BITS(test_var, ~TEST_CHANGE_BITS); |
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} |
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|
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/* |
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* Scoped assertions do trigger anywhere in scope. However, the report should |
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* still only point at the start of the scope. |
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*/ |
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static noinline void test_enter_scope(void) |
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{ |
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int x = 0; |
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|
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/* Unrelated accesses to scoped assert. */ |
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READ_ONCE(test_sink); |
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kcsan_check_read(&x, sizeof(x)); |
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} |
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|
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static noinline void test_kernel_assert_writer_scoped(void) |
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{ |
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ASSERT_EXCLUSIVE_WRITER_SCOPED(test_var); |
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test_enter_scope(); |
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} |
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|
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static noinline void test_kernel_assert_access_scoped(void) |
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{ |
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ASSERT_EXCLUSIVE_ACCESS_SCOPED(test_var); |
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test_enter_scope(); |
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} |
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|
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static noinline void test_kernel_rmw_array(void) |
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{ |
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int i; |
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|
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for (i = 0; i < ARRAY_SIZE(test_array); ++i) |
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test_array[i]++; |
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} |
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|
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static noinline void test_kernel_write_struct(void) |
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{ |
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kcsan_check_write(&test_struct, sizeof(test_struct)); |
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kcsan_disable_current(); |
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test_struct.val[3]++; /* induce value change */ |
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kcsan_enable_current(); |
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} |
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|
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static noinline void test_kernel_write_struct_part(void) |
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{ |
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test_struct.val[3] = 42; |
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} |
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|
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static noinline void test_kernel_read_struct_zero_size(void) |
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{ |
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kcsan_check_read(&test_struct.val[3], 0); |
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} |
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|
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static noinline void test_kernel_jiffies_reader(void) |
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{ |
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sink_value((long)jiffies); |
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} |
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|
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static noinline void test_kernel_seqlock_reader(void) |
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{ |
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unsigned int seq; |
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|
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do { |
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seq = read_seqbegin(&test_seqlock); |
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sink_value(test_var); |
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} while (read_seqretry(&test_seqlock, seq)); |
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} |
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|
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static noinline void test_kernel_seqlock_writer(void) |
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{ |
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unsigned long flags; |
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|
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write_seqlock_irqsave(&test_seqlock, flags); |
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test_var++; |
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write_sequnlock_irqrestore(&test_seqlock, flags); |
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} |
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|
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static noinline void test_kernel_atomic_builtins(void) |
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{ |
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/* |
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* Generate concurrent accesses, expecting no reports, ensuring KCSAN |
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* treats builtin atomics as actually atomic. |
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*/ |
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__atomic_load_n(&test_var, __ATOMIC_RELAXED); |
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} |
|
|
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static noinline void test_kernel_xor_1bit(void) |
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{ |
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/* Do not report data races between the read-writes. */ |
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kcsan_nestable_atomic_begin(); |
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test_var ^= 0x10000; |
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kcsan_nestable_atomic_end(); |
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} |
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|
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#define TEST_KERNEL_LOCKED(name, acquire, release) \ |
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static noinline void test_kernel_##name(void) \ |
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{ \ |
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long *flag = &test_struct.val[0]; \ |
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long v = 0; \ |
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if (!(acquire)) \ |
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return; \ |
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while (v++ < 100) { \ |
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test_var++; \ |
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barrier(); \ |
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} \ |
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release; \ |
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test_delay(10); \ |
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} |
|
|
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TEST_KERNEL_LOCKED(with_memorder, |
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cmpxchg_acquire(flag, 0, 1) == 0, |
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smp_store_release(flag, 0)); |
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TEST_KERNEL_LOCKED(wrong_memorder, |
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cmpxchg_relaxed(flag, 0, 1) == 0, |
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WRITE_ONCE(*flag, 0)); |
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TEST_KERNEL_LOCKED(atomic_builtin_with_memorder, |
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__atomic_compare_exchange_n(flag, &v, 1, 0, __ATOMIC_ACQUIRE, __ATOMIC_RELAXED), |
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__atomic_store_n(flag, 0, __ATOMIC_RELEASE)); |
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TEST_KERNEL_LOCKED(atomic_builtin_wrong_memorder, |
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__atomic_compare_exchange_n(flag, &v, 1, 0, __ATOMIC_RELAXED, __ATOMIC_RELAXED), |
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__atomic_store_n(flag, 0, __ATOMIC_RELAXED)); |
|
|
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/* ===== Test cases ===== */ |
|
|
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/* |
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* Tests that various barriers have the expected effect on internal state. Not |
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* exhaustive on atomic_t operations. Unlike the selftest, also checks for |
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* too-strict barrier instrumentation; these can be tolerated, because it does |
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* not cause false positives, but at least we should be aware of such cases. |
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*/ |
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static void test_barrier_nothreads(struct kunit *test) |
|
{ |
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#ifdef CONFIG_KCSAN_WEAK_MEMORY |
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struct kcsan_scoped_access *reorder_access = ¤t->kcsan_ctx.reorder_access; |
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#else |
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struct kcsan_scoped_access *reorder_access = NULL; |
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#endif |
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arch_spinlock_t arch_spinlock = __ARCH_SPIN_LOCK_UNLOCKED; |
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atomic_t dummy; |
|
|
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KCSAN_TEST_REQUIRES(test, reorder_access != NULL); |
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KCSAN_TEST_REQUIRES(test, IS_ENABLED(CONFIG_SMP)); |
|
|
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#define __KCSAN_EXPECT_BARRIER(access_type, barrier, order_before, name) \ |
|
do { \ |
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reorder_access->type = (access_type) | KCSAN_ACCESS_SCOPED; \ |
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reorder_access->size = sizeof(test_var); \ |
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barrier; \ |
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KUNIT_EXPECT_EQ_MSG(test, reorder_access->size, \ |
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order_before ? 0 : sizeof(test_var), \ |
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"improperly instrumented type=(" #access_type "): " name); \ |
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} while (0) |
|
#define KCSAN_EXPECT_READ_BARRIER(b, o) __KCSAN_EXPECT_BARRIER(0, b, o, #b) |
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#define KCSAN_EXPECT_WRITE_BARRIER(b, o) __KCSAN_EXPECT_BARRIER(KCSAN_ACCESS_WRITE, b, o, #b) |
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#define KCSAN_EXPECT_RW_BARRIER(b, o) __KCSAN_EXPECT_BARRIER(KCSAN_ACCESS_COMPOUND | KCSAN_ACCESS_WRITE, b, o, #b) |
|
|
|
/* |
|
* Lockdep initialization can strengthen certain locking operations due |
|
* to calling into instrumented files; "warm up" our locks. |
|
*/ |
|
spin_lock(&test_spinlock); |
|
spin_unlock(&test_spinlock); |
|
mutex_lock(&test_mutex); |
|
mutex_unlock(&test_mutex); |
|
|
|
/* Force creating a valid entry in reorder_access first. */ |
|
test_var = 0; |
|
while (test_var++ < 1000000 && reorder_access->size != sizeof(test_var)) |
|
__kcsan_check_read(&test_var, sizeof(test_var)); |
|
KUNIT_ASSERT_EQ(test, reorder_access->size, sizeof(test_var)); |
|
|
|
kcsan_nestable_atomic_begin(); /* No watchpoints in called functions. */ |
|
|
|
KCSAN_EXPECT_READ_BARRIER(mb(), true); |
|
KCSAN_EXPECT_READ_BARRIER(wmb(), false); |
|
KCSAN_EXPECT_READ_BARRIER(rmb(), true); |
|
KCSAN_EXPECT_READ_BARRIER(smp_mb(), true); |
|
KCSAN_EXPECT_READ_BARRIER(smp_wmb(), false); |
|
KCSAN_EXPECT_READ_BARRIER(smp_rmb(), true); |
|
KCSAN_EXPECT_READ_BARRIER(dma_wmb(), false); |
|
KCSAN_EXPECT_READ_BARRIER(dma_rmb(), true); |
|
KCSAN_EXPECT_READ_BARRIER(smp_mb__before_atomic(), true); |
|
KCSAN_EXPECT_READ_BARRIER(smp_mb__after_atomic(), true); |
|
KCSAN_EXPECT_READ_BARRIER(smp_mb__after_spinlock(), true); |
|
KCSAN_EXPECT_READ_BARRIER(smp_store_mb(test_var, 0), true); |
|
KCSAN_EXPECT_READ_BARRIER(smp_load_acquire(&test_var), false); |
|
KCSAN_EXPECT_READ_BARRIER(smp_store_release(&test_var, 0), true); |
|
KCSAN_EXPECT_READ_BARRIER(xchg(&test_var, 0), true); |
|
KCSAN_EXPECT_READ_BARRIER(xchg_release(&test_var, 0), true); |
|
KCSAN_EXPECT_READ_BARRIER(xchg_relaxed(&test_var, 0), false); |
|
KCSAN_EXPECT_READ_BARRIER(cmpxchg(&test_var, 0, 0), true); |
|
KCSAN_EXPECT_READ_BARRIER(cmpxchg_release(&test_var, 0, 0), true); |
|
KCSAN_EXPECT_READ_BARRIER(cmpxchg_relaxed(&test_var, 0, 0), false); |
|
KCSAN_EXPECT_READ_BARRIER(atomic_read(&dummy), false); |
|
KCSAN_EXPECT_READ_BARRIER(atomic_read_acquire(&dummy), false); |
|
KCSAN_EXPECT_READ_BARRIER(atomic_set(&dummy, 0), false); |
|
KCSAN_EXPECT_READ_BARRIER(atomic_set_release(&dummy, 0), true); |
|
KCSAN_EXPECT_READ_BARRIER(atomic_add(1, &dummy), false); |
|
KCSAN_EXPECT_READ_BARRIER(atomic_add_return(1, &dummy), true); |
|
KCSAN_EXPECT_READ_BARRIER(atomic_add_return_acquire(1, &dummy), false); |
|
KCSAN_EXPECT_READ_BARRIER(atomic_add_return_release(1, &dummy), true); |
|
KCSAN_EXPECT_READ_BARRIER(atomic_add_return_relaxed(1, &dummy), false); |
|
KCSAN_EXPECT_READ_BARRIER(atomic_fetch_add(1, &dummy), true); |
|
KCSAN_EXPECT_READ_BARRIER(atomic_fetch_add_acquire(1, &dummy), false); |
|
KCSAN_EXPECT_READ_BARRIER(atomic_fetch_add_release(1, &dummy), true); |
|
KCSAN_EXPECT_READ_BARRIER(atomic_fetch_add_relaxed(1, &dummy), false); |
|
KCSAN_EXPECT_READ_BARRIER(test_and_set_bit(0, &test_var), true); |
|
KCSAN_EXPECT_READ_BARRIER(test_and_clear_bit(0, &test_var), true); |
|
KCSAN_EXPECT_READ_BARRIER(test_and_change_bit(0, &test_var), true); |
|
KCSAN_EXPECT_READ_BARRIER(clear_bit_unlock(0, &test_var), true); |
|
KCSAN_EXPECT_READ_BARRIER(__clear_bit_unlock(0, &test_var), true); |
|
KCSAN_EXPECT_READ_BARRIER(arch_spin_lock(&arch_spinlock), false); |
|
KCSAN_EXPECT_READ_BARRIER(arch_spin_unlock(&arch_spinlock), true); |
|
KCSAN_EXPECT_READ_BARRIER(spin_lock(&test_spinlock), false); |
|
KCSAN_EXPECT_READ_BARRIER(spin_unlock(&test_spinlock), true); |
|
KCSAN_EXPECT_READ_BARRIER(mutex_lock(&test_mutex), false); |
|
KCSAN_EXPECT_READ_BARRIER(mutex_unlock(&test_mutex), true); |
|
|
|
KCSAN_EXPECT_WRITE_BARRIER(mb(), true); |
|
KCSAN_EXPECT_WRITE_BARRIER(wmb(), true); |
|
KCSAN_EXPECT_WRITE_BARRIER(rmb(), false); |
|
KCSAN_EXPECT_WRITE_BARRIER(smp_mb(), true); |
|
KCSAN_EXPECT_WRITE_BARRIER(smp_wmb(), true); |
|
KCSAN_EXPECT_WRITE_BARRIER(smp_rmb(), false); |
|
KCSAN_EXPECT_WRITE_BARRIER(dma_wmb(), true); |
|
KCSAN_EXPECT_WRITE_BARRIER(dma_rmb(), false); |
|
KCSAN_EXPECT_WRITE_BARRIER(smp_mb__before_atomic(), true); |
|
KCSAN_EXPECT_WRITE_BARRIER(smp_mb__after_atomic(), true); |
|
KCSAN_EXPECT_WRITE_BARRIER(smp_mb__after_spinlock(), true); |
|
KCSAN_EXPECT_WRITE_BARRIER(smp_store_mb(test_var, 0), true); |
|
KCSAN_EXPECT_WRITE_BARRIER(smp_load_acquire(&test_var), false); |
|
KCSAN_EXPECT_WRITE_BARRIER(smp_store_release(&test_var, 0), true); |
|
KCSAN_EXPECT_WRITE_BARRIER(xchg(&test_var, 0), true); |
|
KCSAN_EXPECT_WRITE_BARRIER(xchg_release(&test_var, 0), true); |
|
KCSAN_EXPECT_WRITE_BARRIER(xchg_relaxed(&test_var, 0), false); |
|
KCSAN_EXPECT_WRITE_BARRIER(cmpxchg(&test_var, 0, 0), true); |
|
KCSAN_EXPECT_WRITE_BARRIER(cmpxchg_release(&test_var, 0, 0), true); |
|
KCSAN_EXPECT_WRITE_BARRIER(cmpxchg_relaxed(&test_var, 0, 0), false); |
|
KCSAN_EXPECT_WRITE_BARRIER(atomic_read(&dummy), false); |
|
KCSAN_EXPECT_WRITE_BARRIER(atomic_read_acquire(&dummy), false); |
|
KCSAN_EXPECT_WRITE_BARRIER(atomic_set(&dummy, 0), false); |
|
KCSAN_EXPECT_WRITE_BARRIER(atomic_set_release(&dummy, 0), true); |
|
KCSAN_EXPECT_WRITE_BARRIER(atomic_add(1, &dummy), false); |
|
KCSAN_EXPECT_WRITE_BARRIER(atomic_add_return(1, &dummy), true); |
|
KCSAN_EXPECT_WRITE_BARRIER(atomic_add_return_acquire(1, &dummy), false); |
|
KCSAN_EXPECT_WRITE_BARRIER(atomic_add_return_release(1, &dummy), true); |
|
KCSAN_EXPECT_WRITE_BARRIER(atomic_add_return_relaxed(1, &dummy), false); |
|
KCSAN_EXPECT_WRITE_BARRIER(atomic_fetch_add(1, &dummy), true); |
|
KCSAN_EXPECT_WRITE_BARRIER(atomic_fetch_add_acquire(1, &dummy), false); |
|
KCSAN_EXPECT_WRITE_BARRIER(atomic_fetch_add_release(1, &dummy), true); |
|
KCSAN_EXPECT_WRITE_BARRIER(atomic_fetch_add_relaxed(1, &dummy), false); |
|
KCSAN_EXPECT_WRITE_BARRIER(test_and_set_bit(0, &test_var), true); |
|
KCSAN_EXPECT_WRITE_BARRIER(test_and_clear_bit(0, &test_var), true); |
|
KCSAN_EXPECT_WRITE_BARRIER(test_and_change_bit(0, &test_var), true); |
|
KCSAN_EXPECT_WRITE_BARRIER(clear_bit_unlock(0, &test_var), true); |
|
KCSAN_EXPECT_WRITE_BARRIER(__clear_bit_unlock(0, &test_var), true); |
|
KCSAN_EXPECT_WRITE_BARRIER(arch_spin_lock(&arch_spinlock), false); |
|
KCSAN_EXPECT_WRITE_BARRIER(arch_spin_unlock(&arch_spinlock), true); |
|
KCSAN_EXPECT_WRITE_BARRIER(spin_lock(&test_spinlock), false); |
|
KCSAN_EXPECT_WRITE_BARRIER(spin_unlock(&test_spinlock), true); |
|
KCSAN_EXPECT_WRITE_BARRIER(mutex_lock(&test_mutex), false); |
|
KCSAN_EXPECT_WRITE_BARRIER(mutex_unlock(&test_mutex), true); |
|
|
|
KCSAN_EXPECT_RW_BARRIER(mb(), true); |
|
KCSAN_EXPECT_RW_BARRIER(wmb(), true); |
|
KCSAN_EXPECT_RW_BARRIER(rmb(), true); |
|
KCSAN_EXPECT_RW_BARRIER(smp_mb(), true); |
|
KCSAN_EXPECT_RW_BARRIER(smp_wmb(), true); |
|
KCSAN_EXPECT_RW_BARRIER(smp_rmb(), true); |
|
KCSAN_EXPECT_RW_BARRIER(dma_wmb(), true); |
|
KCSAN_EXPECT_RW_BARRIER(dma_rmb(), true); |
|
KCSAN_EXPECT_RW_BARRIER(smp_mb__before_atomic(), true); |
|
KCSAN_EXPECT_RW_BARRIER(smp_mb__after_atomic(), true); |
|
KCSAN_EXPECT_RW_BARRIER(smp_mb__after_spinlock(), true); |
|
KCSAN_EXPECT_RW_BARRIER(smp_store_mb(test_var, 0), true); |
|
KCSAN_EXPECT_RW_BARRIER(smp_load_acquire(&test_var), false); |
|
KCSAN_EXPECT_RW_BARRIER(smp_store_release(&test_var, 0), true); |
|
KCSAN_EXPECT_RW_BARRIER(xchg(&test_var, 0), true); |
|
KCSAN_EXPECT_RW_BARRIER(xchg_release(&test_var, 0), true); |
|
KCSAN_EXPECT_RW_BARRIER(xchg_relaxed(&test_var, 0), false); |
|
KCSAN_EXPECT_RW_BARRIER(cmpxchg(&test_var, 0, 0), true); |
|
KCSAN_EXPECT_RW_BARRIER(cmpxchg_release(&test_var, 0, 0), true); |
|
KCSAN_EXPECT_RW_BARRIER(cmpxchg_relaxed(&test_var, 0, 0), false); |
|
KCSAN_EXPECT_RW_BARRIER(atomic_read(&dummy), false); |
|
KCSAN_EXPECT_RW_BARRIER(atomic_read_acquire(&dummy), false); |
|
KCSAN_EXPECT_RW_BARRIER(atomic_set(&dummy, 0), false); |
|
KCSAN_EXPECT_RW_BARRIER(atomic_set_release(&dummy, 0), true); |
|
KCSAN_EXPECT_RW_BARRIER(atomic_add(1, &dummy), false); |
|
KCSAN_EXPECT_RW_BARRIER(atomic_add_return(1, &dummy), true); |
|
KCSAN_EXPECT_RW_BARRIER(atomic_add_return_acquire(1, &dummy), false); |
|
KCSAN_EXPECT_RW_BARRIER(atomic_add_return_release(1, &dummy), true); |
|
KCSAN_EXPECT_RW_BARRIER(atomic_add_return_relaxed(1, &dummy), false); |
|
KCSAN_EXPECT_RW_BARRIER(atomic_fetch_add(1, &dummy), true); |
|
KCSAN_EXPECT_RW_BARRIER(atomic_fetch_add_acquire(1, &dummy), false); |
|
KCSAN_EXPECT_RW_BARRIER(atomic_fetch_add_release(1, &dummy), true); |
|
KCSAN_EXPECT_RW_BARRIER(atomic_fetch_add_relaxed(1, &dummy), false); |
|
KCSAN_EXPECT_RW_BARRIER(test_and_set_bit(0, &test_var), true); |
|
KCSAN_EXPECT_RW_BARRIER(test_and_clear_bit(0, &test_var), true); |
|
KCSAN_EXPECT_RW_BARRIER(test_and_change_bit(0, &test_var), true); |
|
KCSAN_EXPECT_RW_BARRIER(clear_bit_unlock(0, &test_var), true); |
|
KCSAN_EXPECT_RW_BARRIER(__clear_bit_unlock(0, &test_var), true); |
|
KCSAN_EXPECT_RW_BARRIER(arch_spin_lock(&arch_spinlock), false); |
|
KCSAN_EXPECT_RW_BARRIER(arch_spin_unlock(&arch_spinlock), true); |
|
KCSAN_EXPECT_RW_BARRIER(spin_lock(&test_spinlock), false); |
|
KCSAN_EXPECT_RW_BARRIER(spin_unlock(&test_spinlock), true); |
|
KCSAN_EXPECT_RW_BARRIER(mutex_lock(&test_mutex), false); |
|
KCSAN_EXPECT_RW_BARRIER(mutex_unlock(&test_mutex), true); |
|
|
|
#ifdef clear_bit_unlock_is_negative_byte |
|
KCSAN_EXPECT_READ_BARRIER(clear_bit_unlock_is_negative_byte(0, &test_var), true); |
|
KCSAN_EXPECT_WRITE_BARRIER(clear_bit_unlock_is_negative_byte(0, &test_var), true); |
|
KCSAN_EXPECT_RW_BARRIER(clear_bit_unlock_is_negative_byte(0, &test_var), true); |
|
#endif |
|
kcsan_nestable_atomic_end(); |
|
} |
|
|
|
/* Simple test with normal data race. */ |
|
__no_kcsan |
|
static void test_basic(struct kunit *test) |
|
{ |
|
struct expect_report expect = { |
|
.access = { |
|
{ test_kernel_write, &test_var, sizeof(test_var), KCSAN_ACCESS_WRITE }, |
|
{ test_kernel_read, &test_var, sizeof(test_var), 0 }, |
|
}, |
|
}; |
|
struct expect_report never = { |
|
.access = { |
|
{ test_kernel_read, &test_var, sizeof(test_var), 0 }, |
|
{ test_kernel_read, &test_var, sizeof(test_var), 0 }, |
|
}, |
|
}; |
|
bool match_expect = false; |
|
bool match_never = false; |
|
|
|
begin_test_checks(test_kernel_write, test_kernel_read); |
|
do { |
|
match_expect |= report_matches(&expect); |
|
match_never = report_matches(&never); |
|
} while (!end_test_checks(match_never)); |
|
KUNIT_EXPECT_TRUE(test, match_expect); |
|
KUNIT_EXPECT_FALSE(test, match_never); |
|
} |
|
|
|
/* |
|
* Stress KCSAN with lots of concurrent races on different addresses until |
|
* timeout. |
|
*/ |
|
__no_kcsan |
|
static void test_concurrent_races(struct kunit *test) |
|
{ |
|
struct expect_report expect = { |
|
.access = { |
|
/* NULL will match any address. */ |
|
{ test_kernel_rmw_array, NULL, 0, __KCSAN_ACCESS_RW(KCSAN_ACCESS_WRITE) }, |
|
{ test_kernel_rmw_array, NULL, 0, __KCSAN_ACCESS_RW(0) }, |
|
}, |
|
}; |
|
struct expect_report never = { |
|
.access = { |
|
{ test_kernel_rmw_array, NULL, 0, 0 }, |
|
{ test_kernel_rmw_array, NULL, 0, 0 }, |
|
}, |
|
}; |
|
bool match_expect = false; |
|
bool match_never = false; |
|
|
|
begin_test_checks(test_kernel_rmw_array, test_kernel_rmw_array); |
|
do { |
|
match_expect |= report_matches(&expect); |
|
match_never |= report_matches(&never); |
|
} while (!end_test_checks(false)); |
|
KUNIT_EXPECT_TRUE(test, match_expect); /* Sanity check matches exist. */ |
|
KUNIT_EXPECT_FALSE(test, match_never); |
|
} |
|
|
|
/* Test the KCSAN_REPORT_VALUE_CHANGE_ONLY option. */ |
|
__no_kcsan |
|
static void test_novalue_change(struct kunit *test) |
|
{ |
|
struct expect_report expect_rw = { |
|
.access = { |
|
{ test_kernel_write_nochange, &test_var, sizeof(test_var), KCSAN_ACCESS_WRITE }, |
|
{ test_kernel_read, &test_var, sizeof(test_var), 0 }, |
|
}, |
|
}; |
|
struct expect_report expect_ww = { |
|
.access = { |
|
{ test_kernel_write_nochange, &test_var, sizeof(test_var), KCSAN_ACCESS_WRITE }, |
|
{ test_kernel_write_nochange, &test_var, sizeof(test_var), KCSAN_ACCESS_WRITE }, |
|
}, |
|
}; |
|
bool match_expect = false; |
|
|
|
test_kernel_write_nochange(); /* Reset value. */ |
|
begin_test_checks(test_kernel_write_nochange, test_kernel_read); |
|
do { |
|
match_expect = report_matches(&expect_rw) || report_matches(&expect_ww); |
|
} while (!end_test_checks(match_expect)); |
|
if (IS_ENABLED(CONFIG_KCSAN_REPORT_VALUE_CHANGE_ONLY)) |
|
KUNIT_EXPECT_FALSE(test, match_expect); |
|
else |
|
KUNIT_EXPECT_TRUE(test, match_expect); |
|
} |
|
|
|
/* |
|
* Test that the rules where the KCSAN_REPORT_VALUE_CHANGE_ONLY option should |
|
* never apply work. |
|
*/ |
|
__no_kcsan |
|
static void test_novalue_change_exception(struct kunit *test) |
|
{ |
|
struct expect_report expect_rw = { |
|
.access = { |
|
{ test_kernel_write_nochange_rcu, &test_var, sizeof(test_var), KCSAN_ACCESS_WRITE }, |
|
{ test_kernel_read, &test_var, sizeof(test_var), 0 }, |
|
}, |
|
}; |
|
struct expect_report expect_ww = { |
|
.access = { |
|
{ test_kernel_write_nochange_rcu, &test_var, sizeof(test_var), KCSAN_ACCESS_WRITE }, |
|
{ test_kernel_write_nochange_rcu, &test_var, sizeof(test_var), KCSAN_ACCESS_WRITE }, |
|
}, |
|
}; |
|
bool match_expect = false; |
|
|
|
test_kernel_write_nochange_rcu(); /* Reset value. */ |
|
begin_test_checks(test_kernel_write_nochange_rcu, test_kernel_read); |
|
do { |
|
match_expect = report_matches(&expect_rw) || report_matches(&expect_ww); |
|
} while (!end_test_checks(match_expect)); |
|
KUNIT_EXPECT_TRUE(test, match_expect); |
|
} |
|
|
|
/* Test that data races of unknown origin are reported. */ |
|
__no_kcsan |
|
static void test_unknown_origin(struct kunit *test) |
|
{ |
|
struct expect_report expect = { |
|
.access = { |
|
{ test_kernel_read, &test_var, sizeof(test_var), 0 }, |
|
{ NULL }, |
|
}, |
|
}; |
|
bool match_expect = false; |
|
|
|
begin_test_checks(test_kernel_write_uninstrumented, test_kernel_read); |
|
do { |
|
match_expect = report_matches(&expect); |
|
} while (!end_test_checks(match_expect)); |
|
if (IS_ENABLED(CONFIG_KCSAN_REPORT_RACE_UNKNOWN_ORIGIN)) |
|
KUNIT_EXPECT_TRUE(test, match_expect); |
|
else |
|
KUNIT_EXPECT_FALSE(test, match_expect); |
|
} |
|
|
|
/* Test KCSAN_ASSUME_PLAIN_WRITES_ATOMIC if it is selected. */ |
|
__no_kcsan |
|
static void test_write_write_assume_atomic(struct kunit *test) |
|
{ |
|
struct expect_report expect = { |
|
.access = { |
|
{ test_kernel_write, &test_var, sizeof(test_var), KCSAN_ACCESS_WRITE }, |
|
{ test_kernel_write, &test_var, sizeof(test_var), KCSAN_ACCESS_WRITE }, |
|
}, |
|
}; |
|
bool match_expect = false; |
|
|
|
begin_test_checks(test_kernel_write, test_kernel_write); |
|
do { |
|
sink_value(READ_ONCE(test_var)); /* induce value-change */ |
|
match_expect = report_matches(&expect); |
|
} while (!end_test_checks(match_expect)); |
|
if (IS_ENABLED(CONFIG_KCSAN_ASSUME_PLAIN_WRITES_ATOMIC)) |
|
KUNIT_EXPECT_FALSE(test, match_expect); |
|
else |
|
KUNIT_EXPECT_TRUE(test, match_expect); |
|
} |
|
|
|
/* |
|
* Test that data races with writes larger than word-size are always reported, |
|
* even if KCSAN_ASSUME_PLAIN_WRITES_ATOMIC is selected. |
|
*/ |
|
__no_kcsan |
|
static void test_write_write_struct(struct kunit *test) |
|
{ |
|
struct expect_report expect = { |
|
.access = { |
|
{ test_kernel_write_struct, &test_struct, sizeof(test_struct), KCSAN_ACCESS_WRITE }, |
|
{ test_kernel_write_struct, &test_struct, sizeof(test_struct), KCSAN_ACCESS_WRITE }, |
|
}, |
|
}; |
|
bool match_expect = false; |
|
|
|
begin_test_checks(test_kernel_write_struct, test_kernel_write_struct); |
|
do { |
|
match_expect = report_matches(&expect); |
|
} while (!end_test_checks(match_expect)); |
|
KUNIT_EXPECT_TRUE(test, match_expect); |
|
} |
|
|
|
/* |
|
* Test that data races where only one write is larger than word-size are always |
|
* reported, even if KCSAN_ASSUME_PLAIN_WRITES_ATOMIC is selected. |
|
*/ |
|
__no_kcsan |
|
static void test_write_write_struct_part(struct kunit *test) |
|
{ |
|
struct expect_report expect = { |
|
.access = { |
|
{ test_kernel_write_struct, &test_struct, sizeof(test_struct), KCSAN_ACCESS_WRITE }, |
|
{ test_kernel_write_struct_part, &test_struct.val[3], sizeof(test_struct.val[3]), KCSAN_ACCESS_WRITE }, |
|
}, |
|
}; |
|
bool match_expect = false; |
|
|
|
begin_test_checks(test_kernel_write_struct, test_kernel_write_struct_part); |
|
do { |
|
match_expect = report_matches(&expect); |
|
} while (!end_test_checks(match_expect)); |
|
KUNIT_EXPECT_TRUE(test, match_expect); |
|
} |
|
|
|
/* Test that races with atomic accesses never result in reports. */ |
|
__no_kcsan |
|
static void test_read_atomic_write_atomic(struct kunit *test) |
|
{ |
|
bool match_never = false; |
|
|
|
begin_test_checks(test_kernel_read_atomic, test_kernel_write_atomic); |
|
do { |
|
match_never = report_available(); |
|
} while (!end_test_checks(match_never)); |
|
KUNIT_EXPECT_FALSE(test, match_never); |
|
} |
|
|
|
/* Test that a race with an atomic and plain access result in reports. */ |
|
__no_kcsan |
|
static void test_read_plain_atomic_write(struct kunit *test) |
|
{ |
|
struct expect_report expect = { |
|
.access = { |
|
{ test_kernel_read, &test_var, sizeof(test_var), 0 }, |
|
{ test_kernel_write_atomic, &test_var, sizeof(test_var), KCSAN_ACCESS_WRITE | KCSAN_ACCESS_ATOMIC }, |
|
}, |
|
}; |
|
bool match_expect = false; |
|
|
|
KCSAN_TEST_REQUIRES(test, !IS_ENABLED(CONFIG_KCSAN_IGNORE_ATOMICS)); |
|
|
|
begin_test_checks(test_kernel_read, test_kernel_write_atomic); |
|
do { |
|
match_expect = report_matches(&expect); |
|
} while (!end_test_checks(match_expect)); |
|
KUNIT_EXPECT_TRUE(test, match_expect); |
|
} |
|
|
|
/* Test that atomic RMWs generate correct report. */ |
|
__no_kcsan |
|
static void test_read_plain_atomic_rmw(struct kunit *test) |
|
{ |
|
struct expect_report expect = { |
|
.access = { |
|
{ test_kernel_read, &test_var, sizeof(test_var), 0 }, |
|
{ test_kernel_atomic_rmw, &test_var, sizeof(test_var), |
|
KCSAN_ACCESS_COMPOUND | KCSAN_ACCESS_WRITE | KCSAN_ACCESS_ATOMIC }, |
|
}, |
|
}; |
|
bool match_expect = false; |
|
|
|
KCSAN_TEST_REQUIRES(test, !IS_ENABLED(CONFIG_KCSAN_IGNORE_ATOMICS)); |
|
|
|
begin_test_checks(test_kernel_read, test_kernel_atomic_rmw); |
|
do { |
|
match_expect = report_matches(&expect); |
|
} while (!end_test_checks(match_expect)); |
|
KUNIT_EXPECT_TRUE(test, match_expect); |
|
} |
|
|
|
/* Zero-sized accesses should never cause data race reports. */ |
|
__no_kcsan |
|
static void test_zero_size_access(struct kunit *test) |
|
{ |
|
struct expect_report expect = { |
|
.access = { |
|
{ test_kernel_write_struct, &test_struct, sizeof(test_struct), KCSAN_ACCESS_WRITE }, |
|
{ test_kernel_write_struct, &test_struct, sizeof(test_struct), KCSAN_ACCESS_WRITE }, |
|
}, |
|
}; |
|
struct expect_report never = { |
|
.access = { |
|
{ test_kernel_write_struct, &test_struct, sizeof(test_struct), KCSAN_ACCESS_WRITE }, |
|
{ test_kernel_read_struct_zero_size, &test_struct.val[3], 0, 0 }, |
|
}, |
|
}; |
|
bool match_expect = false; |
|
bool match_never = false; |
|
|
|
begin_test_checks(test_kernel_write_struct, test_kernel_read_struct_zero_size); |
|
do { |
|
match_expect |= report_matches(&expect); |
|
match_never = report_matches(&never); |
|
} while (!end_test_checks(match_never)); |
|
KUNIT_EXPECT_TRUE(test, match_expect); /* Sanity check. */ |
|
KUNIT_EXPECT_FALSE(test, match_never); |
|
} |
|
|
|
/* Test the data_race() macro. */ |
|
__no_kcsan |
|
static void test_data_race(struct kunit *test) |
|
{ |
|
bool match_never = false; |
|
|
|
begin_test_checks(test_kernel_data_race, test_kernel_data_race); |
|
do { |
|
match_never = report_available(); |
|
} while (!end_test_checks(match_never)); |
|
KUNIT_EXPECT_FALSE(test, match_never); |
|
} |
|
|
|
__no_kcsan |
|
static void test_assert_exclusive_writer(struct kunit *test) |
|
{ |
|
struct expect_report expect = { |
|
.access = { |
|
{ test_kernel_assert_writer, &test_var, sizeof(test_var), KCSAN_ACCESS_ASSERT }, |
|
{ test_kernel_write_nochange, &test_var, sizeof(test_var), KCSAN_ACCESS_WRITE }, |
|
}, |
|
}; |
|
bool match_expect = false; |
|
|
|
begin_test_checks(test_kernel_assert_writer, test_kernel_write_nochange); |
|
do { |
|
match_expect = report_matches(&expect); |
|
} while (!end_test_checks(match_expect)); |
|
KUNIT_EXPECT_TRUE(test, match_expect); |
|
} |
|
|
|
__no_kcsan |
|
static void test_assert_exclusive_access(struct kunit *test) |
|
{ |
|
struct expect_report expect = { |
|
.access = { |
|
{ test_kernel_assert_access, &test_var, sizeof(test_var), KCSAN_ACCESS_ASSERT | KCSAN_ACCESS_WRITE }, |
|
{ test_kernel_read, &test_var, sizeof(test_var), 0 }, |
|
}, |
|
}; |
|
bool match_expect = false; |
|
|
|
begin_test_checks(test_kernel_assert_access, test_kernel_read); |
|
do { |
|
match_expect = report_matches(&expect); |
|
} while (!end_test_checks(match_expect)); |
|
KUNIT_EXPECT_TRUE(test, match_expect); |
|
} |
|
|
|
__no_kcsan |
|
static void test_assert_exclusive_access_writer(struct kunit *test) |
|
{ |
|
struct expect_report expect_access_writer = { |
|
.access = { |
|
{ test_kernel_assert_access, &test_var, sizeof(test_var), KCSAN_ACCESS_ASSERT | KCSAN_ACCESS_WRITE }, |
|
{ test_kernel_assert_writer, &test_var, sizeof(test_var), KCSAN_ACCESS_ASSERT }, |
|
}, |
|
}; |
|
struct expect_report expect_access_access = { |
|
.access = { |
|
{ test_kernel_assert_access, &test_var, sizeof(test_var), KCSAN_ACCESS_ASSERT | KCSAN_ACCESS_WRITE }, |
|
{ test_kernel_assert_access, &test_var, sizeof(test_var), KCSAN_ACCESS_ASSERT | KCSAN_ACCESS_WRITE }, |
|
}, |
|
}; |
|
struct expect_report never = { |
|
.access = { |
|
{ test_kernel_assert_writer, &test_var, sizeof(test_var), KCSAN_ACCESS_ASSERT }, |
|
{ test_kernel_assert_writer, &test_var, sizeof(test_var), KCSAN_ACCESS_ASSERT }, |
|
}, |
|
}; |
|
bool match_expect_access_writer = false; |
|
bool match_expect_access_access = false; |
|
bool match_never = false; |
|
|
|
begin_test_checks(test_kernel_assert_access, test_kernel_assert_writer); |
|
do { |
|
match_expect_access_writer |= report_matches(&expect_access_writer); |
|
match_expect_access_access |= report_matches(&expect_access_access); |
|
match_never |= report_matches(&never); |
|
} while (!end_test_checks(match_never)); |
|
KUNIT_EXPECT_TRUE(test, match_expect_access_writer); |
|
KUNIT_EXPECT_TRUE(test, match_expect_access_access); |
|
KUNIT_EXPECT_FALSE(test, match_never); |
|
} |
|
|
|
__no_kcsan |
|
static void test_assert_exclusive_bits_change(struct kunit *test) |
|
{ |
|
struct expect_report expect = { |
|
.access = { |
|
{ test_kernel_assert_bits_change, &test_var, sizeof(test_var), KCSAN_ACCESS_ASSERT }, |
|
{ test_kernel_change_bits, &test_var, sizeof(test_var), |
|
KCSAN_ACCESS_WRITE | (IS_ENABLED(CONFIG_KCSAN_IGNORE_ATOMICS) ? 0 : KCSAN_ACCESS_ATOMIC) }, |
|
}, |
|
}; |
|
bool match_expect = false; |
|
|
|
begin_test_checks(test_kernel_assert_bits_change, test_kernel_change_bits); |
|
do { |
|
match_expect = report_matches(&expect); |
|
} while (!end_test_checks(match_expect)); |
|
KUNIT_EXPECT_TRUE(test, match_expect); |
|
} |
|
|
|
__no_kcsan |
|
static void test_assert_exclusive_bits_nochange(struct kunit *test) |
|
{ |
|
bool match_never = false; |
|
|
|
begin_test_checks(test_kernel_assert_bits_nochange, test_kernel_change_bits); |
|
do { |
|
match_never = report_available(); |
|
} while (!end_test_checks(match_never)); |
|
KUNIT_EXPECT_FALSE(test, match_never); |
|
} |
|
|
|
__no_kcsan |
|
static void test_assert_exclusive_writer_scoped(struct kunit *test) |
|
{ |
|
struct expect_report expect_start = { |
|
.access = { |
|
{ test_kernel_assert_writer_scoped, &test_var, sizeof(test_var), KCSAN_ACCESS_ASSERT | KCSAN_ACCESS_SCOPED }, |
|
{ test_kernel_write_nochange, &test_var, sizeof(test_var), KCSAN_ACCESS_WRITE }, |
|
}, |
|
}; |
|
struct expect_report expect_inscope = { |
|
.access = { |
|
{ test_enter_scope, &test_var, sizeof(test_var), KCSAN_ACCESS_ASSERT | KCSAN_ACCESS_SCOPED }, |
|
{ test_kernel_write_nochange, &test_var, sizeof(test_var), KCSAN_ACCESS_WRITE }, |
|
}, |
|
}; |
|
bool match_expect_start = false; |
|
bool match_expect_inscope = false; |
|
|
|
begin_test_checks(test_kernel_assert_writer_scoped, test_kernel_write_nochange); |
|
do { |
|
match_expect_start |= report_matches(&expect_start); |
|
match_expect_inscope |= report_matches(&expect_inscope); |
|
} while (!end_test_checks(match_expect_inscope)); |
|
KUNIT_EXPECT_TRUE(test, match_expect_start); |
|
KUNIT_EXPECT_FALSE(test, match_expect_inscope); |
|
} |
|
|
|
__no_kcsan |
|
static void test_assert_exclusive_access_scoped(struct kunit *test) |
|
{ |
|
struct expect_report expect_start1 = { |
|
.access = { |
|
{ test_kernel_assert_access_scoped, &test_var, sizeof(test_var), KCSAN_ACCESS_ASSERT | KCSAN_ACCESS_WRITE | KCSAN_ACCESS_SCOPED }, |
|
{ test_kernel_read, &test_var, sizeof(test_var), 0 }, |
|
}, |
|
}; |
|
struct expect_report expect_start2 = { |
|
.access = { expect_start1.access[0], expect_start1.access[0] }, |
|
}; |
|
struct expect_report expect_inscope = { |
|
.access = { |
|
{ test_enter_scope, &test_var, sizeof(test_var), KCSAN_ACCESS_ASSERT | KCSAN_ACCESS_WRITE | KCSAN_ACCESS_SCOPED }, |
|
{ test_kernel_read, &test_var, sizeof(test_var), 0 }, |
|
}, |
|
}; |
|
bool match_expect_start = false; |
|
bool match_expect_inscope = false; |
|
|
|
begin_test_checks(test_kernel_assert_access_scoped, test_kernel_read); |
|
end_time += msecs_to_jiffies(1000); /* This test requires a bit more time. */ |
|
do { |
|
match_expect_start |= report_matches(&expect_start1) || report_matches(&expect_start2); |
|
match_expect_inscope |= report_matches(&expect_inscope); |
|
} while (!end_test_checks(match_expect_inscope)); |
|
KUNIT_EXPECT_TRUE(test, match_expect_start); |
|
KUNIT_EXPECT_FALSE(test, match_expect_inscope); |
|
} |
|
|
|
/* |
|
* jiffies is special (declared to be volatile) and its accesses are typically |
|
* not marked; this test ensures that the compiler nor KCSAN gets confused about |
|
* jiffies's declaration on different architectures. |
|
*/ |
|
__no_kcsan |
|
static void test_jiffies_noreport(struct kunit *test) |
|
{ |
|
bool match_never = false; |
|
|
|
begin_test_checks(test_kernel_jiffies_reader, test_kernel_jiffies_reader); |
|
do { |
|
match_never = report_available(); |
|
} while (!end_test_checks(match_never)); |
|
KUNIT_EXPECT_FALSE(test, match_never); |
|
} |
|
|
|
/* Test that racing accesses in seqlock critical sections are not reported. */ |
|
__no_kcsan |
|
static void test_seqlock_noreport(struct kunit *test) |
|
{ |
|
bool match_never = false; |
|
|
|
begin_test_checks(test_kernel_seqlock_reader, test_kernel_seqlock_writer); |
|
do { |
|
match_never = report_available(); |
|
} while (!end_test_checks(match_never)); |
|
KUNIT_EXPECT_FALSE(test, match_never); |
|
} |
|
|
|
/* |
|
* Test atomic builtins work and required instrumentation functions exist. We |
|
* also test that KCSAN understands they're atomic by racing with them via |
|
* test_kernel_atomic_builtins(), and expect no reports. |
|
* |
|
* The atomic builtins _SHOULD NOT_ be used in normal kernel code! |
|
*/ |
|
static void test_atomic_builtins(struct kunit *test) |
|
{ |
|
bool match_never = false; |
|
|
|
begin_test_checks(test_kernel_atomic_builtins, test_kernel_atomic_builtins); |
|
do { |
|
long tmp; |
|
|
|
kcsan_enable_current(); |
|
|
|
__atomic_store_n(&test_var, 42L, __ATOMIC_RELAXED); |
|
KUNIT_EXPECT_EQ(test, 42L, __atomic_load_n(&test_var, __ATOMIC_RELAXED)); |
|
|
|
KUNIT_EXPECT_EQ(test, 42L, __atomic_exchange_n(&test_var, 20, __ATOMIC_RELAXED)); |
|
KUNIT_EXPECT_EQ(test, 20L, test_var); |
|
|
|
tmp = 20L; |
|
KUNIT_EXPECT_TRUE(test, __atomic_compare_exchange_n(&test_var, &tmp, 30L, |
|
0, __ATOMIC_RELAXED, |
|
__ATOMIC_RELAXED)); |
|
KUNIT_EXPECT_EQ(test, tmp, 20L); |
|
KUNIT_EXPECT_EQ(test, test_var, 30L); |
|
KUNIT_EXPECT_FALSE(test, __atomic_compare_exchange_n(&test_var, &tmp, 40L, |
|
1, __ATOMIC_RELAXED, |
|
__ATOMIC_RELAXED)); |
|
KUNIT_EXPECT_EQ(test, tmp, 30L); |
|
KUNIT_EXPECT_EQ(test, test_var, 30L); |
|
|
|
KUNIT_EXPECT_EQ(test, 30L, __atomic_fetch_add(&test_var, 1, __ATOMIC_RELAXED)); |
|
KUNIT_EXPECT_EQ(test, 31L, __atomic_fetch_sub(&test_var, 1, __ATOMIC_RELAXED)); |
|
KUNIT_EXPECT_EQ(test, 30L, __atomic_fetch_and(&test_var, 0xf, __ATOMIC_RELAXED)); |
|
KUNIT_EXPECT_EQ(test, 14L, __atomic_fetch_xor(&test_var, 0xf, __ATOMIC_RELAXED)); |
|
KUNIT_EXPECT_EQ(test, 1L, __atomic_fetch_or(&test_var, 0xf0, __ATOMIC_RELAXED)); |
|
KUNIT_EXPECT_EQ(test, 241L, __atomic_fetch_nand(&test_var, 0xf, __ATOMIC_RELAXED)); |
|
KUNIT_EXPECT_EQ(test, -2L, test_var); |
|
|
|
__atomic_thread_fence(__ATOMIC_SEQ_CST); |
|
__atomic_signal_fence(__ATOMIC_SEQ_CST); |
|
|
|
kcsan_disable_current(); |
|
|
|
match_never = report_available(); |
|
} while (!end_test_checks(match_never)); |
|
KUNIT_EXPECT_FALSE(test, match_never); |
|
} |
|
|
|
__no_kcsan |
|
static void test_1bit_value_change(struct kunit *test) |
|
{ |
|
struct expect_report expect = { |
|
.access = { |
|
{ test_kernel_read, &test_var, sizeof(test_var), 0 }, |
|
{ test_kernel_xor_1bit, &test_var, sizeof(test_var), __KCSAN_ACCESS_RW(KCSAN_ACCESS_WRITE) }, |
|
}, |
|
}; |
|
bool match = false; |
|
|
|
begin_test_checks(test_kernel_read, test_kernel_xor_1bit); |
|
do { |
|
match = IS_ENABLED(CONFIG_KCSAN_PERMISSIVE) |
|
? report_available() |
|
: report_matches(&expect); |
|
} while (!end_test_checks(match)); |
|
if (IS_ENABLED(CONFIG_KCSAN_PERMISSIVE)) |
|
KUNIT_EXPECT_FALSE(test, match); |
|
else |
|
KUNIT_EXPECT_TRUE(test, match); |
|
} |
|
|
|
__no_kcsan |
|
static void test_correct_barrier(struct kunit *test) |
|
{ |
|
struct expect_report expect = { |
|
.access = { |
|
{ test_kernel_with_memorder, &test_var, sizeof(test_var), __KCSAN_ACCESS_RW(KCSAN_ACCESS_WRITE) }, |
|
{ test_kernel_with_memorder, &test_var, sizeof(test_var), __KCSAN_ACCESS_RW(0) }, |
|
}, |
|
}; |
|
bool match_expect = false; |
|
|
|
test_struct.val[0] = 0; /* init unlocked */ |
|
begin_test_checks(test_kernel_with_memorder, test_kernel_with_memorder); |
|
do { |
|
match_expect = report_matches_any_reordered(&expect); |
|
} while (!end_test_checks(match_expect)); |
|
KUNIT_EXPECT_FALSE(test, match_expect); |
|
} |
|
|
|
__no_kcsan |
|
static void test_missing_barrier(struct kunit *test) |
|
{ |
|
struct expect_report expect = { |
|
.access = { |
|
{ test_kernel_wrong_memorder, &test_var, sizeof(test_var), __KCSAN_ACCESS_RW(KCSAN_ACCESS_WRITE) }, |
|
{ test_kernel_wrong_memorder, &test_var, sizeof(test_var), __KCSAN_ACCESS_RW(0) }, |
|
}, |
|
}; |
|
bool match_expect = false; |
|
|
|
test_struct.val[0] = 0; /* init unlocked */ |
|
begin_test_checks(test_kernel_wrong_memorder, test_kernel_wrong_memorder); |
|
do { |
|
match_expect = report_matches_any_reordered(&expect); |
|
} while (!end_test_checks(match_expect)); |
|
if (IS_ENABLED(CONFIG_KCSAN_WEAK_MEMORY)) |
|
KUNIT_EXPECT_TRUE(test, match_expect); |
|
else |
|
KUNIT_EXPECT_FALSE(test, match_expect); |
|
} |
|
|
|
__no_kcsan |
|
static void test_atomic_builtins_correct_barrier(struct kunit *test) |
|
{ |
|
struct expect_report expect = { |
|
.access = { |
|
{ test_kernel_atomic_builtin_with_memorder, &test_var, sizeof(test_var), __KCSAN_ACCESS_RW(KCSAN_ACCESS_WRITE) }, |
|
{ test_kernel_atomic_builtin_with_memorder, &test_var, sizeof(test_var), __KCSAN_ACCESS_RW(0) }, |
|
}, |
|
}; |
|
bool match_expect = false; |
|
|
|
test_struct.val[0] = 0; /* init unlocked */ |
|
begin_test_checks(test_kernel_atomic_builtin_with_memorder, |
|
test_kernel_atomic_builtin_with_memorder); |
|
do { |
|
match_expect = report_matches_any_reordered(&expect); |
|
} while (!end_test_checks(match_expect)); |
|
KUNIT_EXPECT_FALSE(test, match_expect); |
|
} |
|
|
|
__no_kcsan |
|
static void test_atomic_builtins_missing_barrier(struct kunit *test) |
|
{ |
|
struct expect_report expect = { |
|
.access = { |
|
{ test_kernel_atomic_builtin_wrong_memorder, &test_var, sizeof(test_var), __KCSAN_ACCESS_RW(KCSAN_ACCESS_WRITE) }, |
|
{ test_kernel_atomic_builtin_wrong_memorder, &test_var, sizeof(test_var), __KCSAN_ACCESS_RW(0) }, |
|
}, |
|
}; |
|
bool match_expect = false; |
|
|
|
test_struct.val[0] = 0; /* init unlocked */ |
|
begin_test_checks(test_kernel_atomic_builtin_wrong_memorder, |
|
test_kernel_atomic_builtin_wrong_memorder); |
|
do { |
|
match_expect = report_matches_any_reordered(&expect); |
|
} while (!end_test_checks(match_expect)); |
|
if (IS_ENABLED(CONFIG_KCSAN_WEAK_MEMORY)) |
|
KUNIT_EXPECT_TRUE(test, match_expect); |
|
else |
|
KUNIT_EXPECT_FALSE(test, match_expect); |
|
} |
|
|
|
/* |
|
* Generate thread counts for all test cases. Values generated are in interval |
|
* [2, 5] followed by exponentially increasing thread counts from 8 to 32. |
|
* |
|
* The thread counts are chosen to cover potentially interesting boundaries and |
|
* corner cases (2 to 5), and then stress the system with larger counts. |
|
*/ |
|
static const void *nthreads_gen_params(const void *prev, char *desc) |
|
{ |
|
long nthreads = (long)prev; |
|
|
|
if (nthreads < 0 || nthreads >= 32) |
|
nthreads = 0; /* stop */ |
|
else if (!nthreads) |
|
nthreads = 2; /* initial value */ |
|
else if (nthreads < 5) |
|
nthreads++; |
|
else if (nthreads == 5) |
|
nthreads = 8; |
|
else |
|
nthreads *= 2; |
|
|
|
if (!preempt_model_preemptible() || |
|
!IS_ENABLED(CONFIG_KCSAN_INTERRUPT_WATCHER)) { |
|
/* |
|
* Without any preemption, keep 2 CPUs free for other tasks, one |
|
* of which is the main test case function checking for |
|
* completion or failure. |
|
*/ |
|
const long min_unused_cpus = preempt_model_none() ? 2 : 0; |
|
const long min_required_cpus = 2 + min_unused_cpus; |
|
|
|
if (num_online_cpus() < min_required_cpus) { |
|
pr_err_once("Too few online CPUs (%u < %ld) for test\n", |
|
num_online_cpus(), min_required_cpus); |
|
nthreads = 0; |
|
} else if (nthreads >= num_online_cpus() - min_unused_cpus) { |
|
/* Use negative value to indicate last param. */ |
|
nthreads = -(num_online_cpus() - min_unused_cpus); |
|
pr_warn_once("Limiting number of threads to %ld (only %d online CPUs)\n", |
|
-nthreads, num_online_cpus()); |
|
} |
|
} |
|
|
|
snprintf(desc, KUNIT_PARAM_DESC_SIZE, "threads=%ld", abs(nthreads)); |
|
return (void *)nthreads; |
|
} |
|
|
|
#define KCSAN_KUNIT_CASE(test_name) KUNIT_CASE_PARAM(test_name, nthreads_gen_params) |
|
static struct kunit_case kcsan_test_cases[] = { |
|
KUNIT_CASE(test_barrier_nothreads), |
|
KCSAN_KUNIT_CASE(test_basic), |
|
KCSAN_KUNIT_CASE(test_concurrent_races), |
|
KCSAN_KUNIT_CASE(test_novalue_change), |
|
KCSAN_KUNIT_CASE(test_novalue_change_exception), |
|
KCSAN_KUNIT_CASE(test_unknown_origin), |
|
KCSAN_KUNIT_CASE(test_write_write_assume_atomic), |
|
KCSAN_KUNIT_CASE(test_write_write_struct), |
|
KCSAN_KUNIT_CASE(test_write_write_struct_part), |
|
KCSAN_KUNIT_CASE(test_read_atomic_write_atomic), |
|
KCSAN_KUNIT_CASE(test_read_plain_atomic_write), |
|
KCSAN_KUNIT_CASE(test_read_plain_atomic_rmw), |
|
KCSAN_KUNIT_CASE(test_zero_size_access), |
|
KCSAN_KUNIT_CASE(test_data_race), |
|
KCSAN_KUNIT_CASE(test_assert_exclusive_writer), |
|
KCSAN_KUNIT_CASE(test_assert_exclusive_access), |
|
KCSAN_KUNIT_CASE(test_assert_exclusive_access_writer), |
|
KCSAN_KUNIT_CASE(test_assert_exclusive_bits_change), |
|
KCSAN_KUNIT_CASE(test_assert_exclusive_bits_nochange), |
|
KCSAN_KUNIT_CASE(test_assert_exclusive_writer_scoped), |
|
KCSAN_KUNIT_CASE(test_assert_exclusive_access_scoped), |
|
KCSAN_KUNIT_CASE(test_jiffies_noreport), |
|
KCSAN_KUNIT_CASE(test_seqlock_noreport), |
|
KCSAN_KUNIT_CASE(test_atomic_builtins), |
|
KCSAN_KUNIT_CASE(test_1bit_value_change), |
|
KCSAN_KUNIT_CASE(test_correct_barrier), |
|
KCSAN_KUNIT_CASE(test_missing_barrier), |
|
KCSAN_KUNIT_CASE(test_atomic_builtins_correct_barrier), |
|
KCSAN_KUNIT_CASE(test_atomic_builtins_missing_barrier), |
|
{}, |
|
}; |
|
|
|
/* ===== End test cases ===== */ |
|
|
|
/* Concurrent accesses from interrupts. */ |
|
__no_kcsan |
|
static void access_thread_timer(struct timer_list *timer) |
|
{ |
|
static atomic_t cnt = ATOMIC_INIT(0); |
|
unsigned int idx; |
|
void (*func)(void); |
|
|
|
idx = (unsigned int)atomic_inc_return(&cnt) % ARRAY_SIZE(access_kernels); |
|
/* Acquire potential initialization. */ |
|
func = smp_load_acquire(&access_kernels[idx]); |
|
if (func) |
|
func(); |
|
} |
|
|
|
/* The main loop for each thread. */ |
|
__no_kcsan |
|
static int access_thread(void *arg) |
|
{ |
|
struct timer_list timer; |
|
unsigned int cnt = 0; |
|
unsigned int idx; |
|
void (*func)(void); |
|
|
|
timer_setup_on_stack(&timer, access_thread_timer, 0); |
|
do { |
|
might_sleep(); |
|
|
|
if (!timer_pending(&timer)) |
|
mod_timer(&timer, jiffies + 1); |
|
else { |
|
/* Iterate through all kernels. */ |
|
idx = cnt++ % ARRAY_SIZE(access_kernels); |
|
/* Acquire potential initialization. */ |
|
func = smp_load_acquire(&access_kernels[idx]); |
|
if (func) |
|
func(); |
|
} |
|
} while (!torture_must_stop()); |
|
del_timer_sync(&timer); |
|
destroy_timer_on_stack(&timer); |
|
|
|
torture_kthread_stopping("access_thread"); |
|
return 0; |
|
} |
|
|
|
__no_kcsan |
|
static int test_init(struct kunit *test) |
|
{ |
|
unsigned long flags; |
|
int nthreads; |
|
int i; |
|
|
|
spin_lock_irqsave(&observed.lock, flags); |
|
for (i = 0; i < ARRAY_SIZE(observed.lines); ++i) |
|
observed.lines[i][0] = '\0'; |
|
observed.nlines = 0; |
|
spin_unlock_irqrestore(&observed.lock, flags); |
|
|
|
if (strstr(test->name, "nothreads")) |
|
return 0; |
|
|
|
if (!torture_init_begin((char *)test->name, 1)) |
|
return -EBUSY; |
|
|
|
if (WARN_ON(threads)) |
|
goto err; |
|
|
|
for (i = 0; i < ARRAY_SIZE(access_kernels); ++i) { |
|
if (WARN_ON(access_kernels[i])) |
|
goto err; |
|
} |
|
|
|
nthreads = abs((long)test->param_value); |
|
if (WARN_ON(!nthreads)) |
|
goto err; |
|
|
|
threads = kcalloc(nthreads + 1, sizeof(struct task_struct *), GFP_KERNEL); |
|
if (WARN_ON(!threads)) |
|
goto err; |
|
|
|
threads[nthreads] = NULL; |
|
for (i = 0; i < nthreads; ++i) { |
|
if (torture_create_kthread(access_thread, NULL, threads[i])) |
|
goto err; |
|
} |
|
|
|
torture_init_end(); |
|
|
|
return 0; |
|
|
|
err: |
|
kfree(threads); |
|
threads = NULL; |
|
torture_init_end(); |
|
return -EINVAL; |
|
} |
|
|
|
__no_kcsan |
|
static void test_exit(struct kunit *test) |
|
{ |
|
struct task_struct **stop_thread; |
|
int i; |
|
|
|
if (strstr(test->name, "nothreads")) |
|
return; |
|
|
|
if (torture_cleanup_begin()) |
|
return; |
|
|
|
for (i = 0; i < ARRAY_SIZE(access_kernels); ++i) |
|
WRITE_ONCE(access_kernels[i], NULL); |
|
|
|
if (threads) { |
|
for (stop_thread = threads; *stop_thread; stop_thread++) |
|
torture_stop_kthread(reader_thread, *stop_thread); |
|
|
|
kfree(threads); |
|
threads = NULL; |
|
} |
|
|
|
torture_cleanup_end(); |
|
} |
|
|
|
__no_kcsan |
|
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)); |
|
} |
|
|
|
__no_kcsan |
|
static void unregister_tracepoints(struct tracepoint *tp, void *ignore) |
|
{ |
|
if (!strcmp(tp->name, "console")) |
|
tracepoint_probe_unregister(tp, probe_console, NULL); |
|
} |
|
|
|
static int kcsan_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 kcsan_suite_exit(struct kunit_suite *suite) |
|
{ |
|
for_each_kernel_tracepoint(unregister_tracepoints, NULL); |
|
tracepoint_synchronize_unregister(); |
|
} |
|
|
|
static struct kunit_suite kcsan_test_suite = { |
|
.name = "kcsan", |
|
.test_cases = kcsan_test_cases, |
|
.init = test_init, |
|
.exit = test_exit, |
|
.suite_init = kcsan_suite_init, |
|
.suite_exit = kcsan_suite_exit, |
|
}; |
|
|
|
kunit_test_suites(&kcsan_test_suite); |
|
|
|
MODULE_LICENSE("GPL v2"); |
|
MODULE_AUTHOR("Marco Elver <[email protected]>");
|
|
|