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kcsan: test: Add test cases for memory barrier instrumentation
Adds test cases to check that memory barriers are instrumented correctly, and detection of missing memory barriers is working as intended if CONFIG_KCSAN_STRICT=y. Signed-off-by: Marco Elver <elver@google.com> Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
This commit is contained in:
Marco Elver
Paul E. McKenney
parent
7310bd1f3e
commit
8bc32b3481
@ -16,9 +16,12 @@
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#define pr_fmt(fmt) "kcsan_test: " fmt
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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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@ -305,6 +308,16 @@ static DEFINE_SEQLOCK(test_seqlock);
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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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@ -466,8 +479,219 @@ static noinline void test_kernel_xor_1bit(void)
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kcsan_nestable_atomic_end();
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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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{
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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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DEFINE_SPINLOCK(spinlock);
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DEFINE_MUTEX(mutex);
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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) \
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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)
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#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)
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/* Force creating a valid entry in reorder_access first. */
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test_var = 0;
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while (test_var++ < 1000000 && reorder_access->size != sizeof(test_var))
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__kcsan_check_read(&test_var, sizeof(test_var));
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KUNIT_ASSERT_EQ(test, reorder_access->size, sizeof(test_var));
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kcsan_nestable_atomic_begin(); /* No watchpoints in called functions. */
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KCSAN_EXPECT_READ_BARRIER(mb(), true);
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KCSAN_EXPECT_READ_BARRIER(wmb(), false);
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KCSAN_EXPECT_READ_BARRIER(rmb(), true);
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KCSAN_EXPECT_READ_BARRIER(smp_mb(), true);
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KCSAN_EXPECT_READ_BARRIER(smp_wmb(), false);
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KCSAN_EXPECT_READ_BARRIER(smp_rmb(), true);
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KCSAN_EXPECT_READ_BARRIER(dma_wmb(), false);
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KCSAN_EXPECT_READ_BARRIER(dma_rmb(), true);
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KCSAN_EXPECT_READ_BARRIER(smp_mb__before_atomic(), true);
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KCSAN_EXPECT_READ_BARRIER(smp_mb__after_atomic(), true);
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KCSAN_EXPECT_READ_BARRIER(smp_mb__after_spinlock(), true);
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KCSAN_EXPECT_READ_BARRIER(smp_store_mb(test_var, 0), true);
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KCSAN_EXPECT_READ_BARRIER(smp_load_acquire(&test_var), false);
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KCSAN_EXPECT_READ_BARRIER(smp_store_release(&test_var, 0), true);
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KCSAN_EXPECT_READ_BARRIER(xchg(&test_var, 0), true);
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KCSAN_EXPECT_READ_BARRIER(xchg_release(&test_var, 0), true);
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KCSAN_EXPECT_READ_BARRIER(xchg_relaxed(&test_var, 0), false);
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KCSAN_EXPECT_READ_BARRIER(cmpxchg(&test_var, 0, 0), true);
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KCSAN_EXPECT_READ_BARRIER(cmpxchg_release(&test_var, 0, 0), true);
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KCSAN_EXPECT_READ_BARRIER(cmpxchg_relaxed(&test_var, 0, 0), false);
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KCSAN_EXPECT_READ_BARRIER(atomic_read(&dummy), false);
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KCSAN_EXPECT_READ_BARRIER(atomic_read_acquire(&dummy), false);
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KCSAN_EXPECT_READ_BARRIER(atomic_set(&dummy, 0), false);
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KCSAN_EXPECT_READ_BARRIER(atomic_set_release(&dummy, 0), true);
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KCSAN_EXPECT_READ_BARRIER(atomic_add(1, &dummy), false);
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KCSAN_EXPECT_READ_BARRIER(atomic_add_return(1, &dummy), true);
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KCSAN_EXPECT_READ_BARRIER(atomic_add_return_acquire(1, &dummy), false);
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KCSAN_EXPECT_READ_BARRIER(atomic_add_return_release(1, &dummy), true);
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KCSAN_EXPECT_READ_BARRIER(atomic_add_return_relaxed(1, &dummy), false);
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KCSAN_EXPECT_READ_BARRIER(atomic_fetch_add(1, &dummy), true);
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KCSAN_EXPECT_READ_BARRIER(atomic_fetch_add_acquire(1, &dummy), false);
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KCSAN_EXPECT_READ_BARRIER(atomic_fetch_add_release(1, &dummy), true);
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KCSAN_EXPECT_READ_BARRIER(atomic_fetch_add_relaxed(1, &dummy), false);
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KCSAN_EXPECT_READ_BARRIER(test_and_set_bit(0, &test_var), true);
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KCSAN_EXPECT_READ_BARRIER(test_and_clear_bit(0, &test_var), true);
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KCSAN_EXPECT_READ_BARRIER(test_and_change_bit(0, &test_var), true);
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KCSAN_EXPECT_READ_BARRIER(clear_bit_unlock(0, &test_var), true);
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KCSAN_EXPECT_READ_BARRIER(__clear_bit_unlock(0, &test_var), true);
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KCSAN_EXPECT_READ_BARRIER(clear_bit_unlock_is_negative_byte(0, &test_var), true);
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KCSAN_EXPECT_READ_BARRIER(arch_spin_lock(&arch_spinlock), false);
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KCSAN_EXPECT_READ_BARRIER(arch_spin_unlock(&arch_spinlock), true);
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KCSAN_EXPECT_READ_BARRIER(spin_lock(&spinlock), false);
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KCSAN_EXPECT_READ_BARRIER(spin_unlock(&spinlock), true);
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KCSAN_EXPECT_READ_BARRIER(mutex_lock(&mutex), false);
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KCSAN_EXPECT_READ_BARRIER(mutex_unlock(&mutex), true);
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KCSAN_EXPECT_WRITE_BARRIER(mb(), true);
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KCSAN_EXPECT_WRITE_BARRIER(wmb(), true);
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KCSAN_EXPECT_WRITE_BARRIER(rmb(), false);
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KCSAN_EXPECT_WRITE_BARRIER(smp_mb(), true);
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KCSAN_EXPECT_WRITE_BARRIER(smp_wmb(), true);
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KCSAN_EXPECT_WRITE_BARRIER(smp_rmb(), false);
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KCSAN_EXPECT_WRITE_BARRIER(dma_wmb(), true);
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KCSAN_EXPECT_WRITE_BARRIER(dma_rmb(), false);
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KCSAN_EXPECT_WRITE_BARRIER(smp_mb__before_atomic(), true);
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KCSAN_EXPECT_WRITE_BARRIER(smp_mb__after_atomic(), true);
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KCSAN_EXPECT_WRITE_BARRIER(smp_mb__after_spinlock(), true);
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KCSAN_EXPECT_WRITE_BARRIER(smp_store_mb(test_var, 0), true);
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KCSAN_EXPECT_WRITE_BARRIER(smp_load_acquire(&test_var), false);
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KCSAN_EXPECT_WRITE_BARRIER(smp_store_release(&test_var, 0), true);
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KCSAN_EXPECT_WRITE_BARRIER(xchg(&test_var, 0), true);
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KCSAN_EXPECT_WRITE_BARRIER(xchg_release(&test_var, 0), true);
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KCSAN_EXPECT_WRITE_BARRIER(xchg_relaxed(&test_var, 0), false);
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KCSAN_EXPECT_WRITE_BARRIER(cmpxchg(&test_var, 0, 0), true);
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KCSAN_EXPECT_WRITE_BARRIER(cmpxchg_release(&test_var, 0, 0), true);
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KCSAN_EXPECT_WRITE_BARRIER(cmpxchg_relaxed(&test_var, 0, 0), false);
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KCSAN_EXPECT_WRITE_BARRIER(atomic_read(&dummy), false);
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KCSAN_EXPECT_WRITE_BARRIER(atomic_read_acquire(&dummy), false);
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KCSAN_EXPECT_WRITE_BARRIER(atomic_set(&dummy, 0), false);
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KCSAN_EXPECT_WRITE_BARRIER(atomic_set_release(&dummy, 0), true);
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KCSAN_EXPECT_WRITE_BARRIER(atomic_add(1, &dummy), false);
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KCSAN_EXPECT_WRITE_BARRIER(atomic_add_return(1, &dummy), true);
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KCSAN_EXPECT_WRITE_BARRIER(atomic_add_return_acquire(1, &dummy), false);
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KCSAN_EXPECT_WRITE_BARRIER(atomic_add_return_release(1, &dummy), true);
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KCSAN_EXPECT_WRITE_BARRIER(atomic_add_return_relaxed(1, &dummy), false);
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KCSAN_EXPECT_WRITE_BARRIER(atomic_fetch_add(1, &dummy), true);
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KCSAN_EXPECT_WRITE_BARRIER(atomic_fetch_add_acquire(1, &dummy), false);
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KCSAN_EXPECT_WRITE_BARRIER(atomic_fetch_add_release(1, &dummy), true);
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KCSAN_EXPECT_WRITE_BARRIER(atomic_fetch_add_relaxed(1, &dummy), false);
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KCSAN_EXPECT_WRITE_BARRIER(test_and_set_bit(0, &test_var), true);
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KCSAN_EXPECT_WRITE_BARRIER(test_and_clear_bit(0, &test_var), true);
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KCSAN_EXPECT_WRITE_BARRIER(test_and_change_bit(0, &test_var), true);
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KCSAN_EXPECT_WRITE_BARRIER(clear_bit_unlock(0, &test_var), true);
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KCSAN_EXPECT_WRITE_BARRIER(__clear_bit_unlock(0, &test_var), true);
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KCSAN_EXPECT_WRITE_BARRIER(clear_bit_unlock_is_negative_byte(0, &test_var), true);
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KCSAN_EXPECT_WRITE_BARRIER(arch_spin_lock(&arch_spinlock), false);
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KCSAN_EXPECT_WRITE_BARRIER(arch_spin_unlock(&arch_spinlock), true);
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KCSAN_EXPECT_WRITE_BARRIER(spin_lock(&spinlock), false);
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KCSAN_EXPECT_WRITE_BARRIER(spin_unlock(&spinlock), true);
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KCSAN_EXPECT_WRITE_BARRIER(mutex_lock(&mutex), false);
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KCSAN_EXPECT_WRITE_BARRIER(mutex_unlock(&mutex), true);
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KCSAN_EXPECT_RW_BARRIER(mb(), true);
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KCSAN_EXPECT_RW_BARRIER(wmb(), true);
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KCSAN_EXPECT_RW_BARRIER(rmb(), true);
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KCSAN_EXPECT_RW_BARRIER(smp_mb(), true);
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KCSAN_EXPECT_RW_BARRIER(smp_wmb(), true);
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KCSAN_EXPECT_RW_BARRIER(smp_rmb(), true);
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KCSAN_EXPECT_RW_BARRIER(dma_wmb(), true);
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KCSAN_EXPECT_RW_BARRIER(dma_rmb(), true);
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KCSAN_EXPECT_RW_BARRIER(smp_mb__before_atomic(), true);
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KCSAN_EXPECT_RW_BARRIER(smp_mb__after_atomic(), true);
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KCSAN_EXPECT_RW_BARRIER(smp_mb__after_spinlock(), true);
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KCSAN_EXPECT_RW_BARRIER(smp_store_mb(test_var, 0), true);
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KCSAN_EXPECT_RW_BARRIER(smp_load_acquire(&test_var), false);
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KCSAN_EXPECT_RW_BARRIER(smp_store_release(&test_var, 0), true);
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KCSAN_EXPECT_RW_BARRIER(xchg(&test_var, 0), true);
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KCSAN_EXPECT_RW_BARRIER(xchg_release(&test_var, 0), true);
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KCSAN_EXPECT_RW_BARRIER(xchg_relaxed(&test_var, 0), false);
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KCSAN_EXPECT_RW_BARRIER(cmpxchg(&test_var, 0, 0), true);
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KCSAN_EXPECT_RW_BARRIER(cmpxchg_release(&test_var, 0, 0), true);
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KCSAN_EXPECT_RW_BARRIER(cmpxchg_relaxed(&test_var, 0, 0), false);
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KCSAN_EXPECT_RW_BARRIER(atomic_read(&dummy), false);
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KCSAN_EXPECT_RW_BARRIER(atomic_read_acquire(&dummy), false);
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KCSAN_EXPECT_RW_BARRIER(atomic_set(&dummy, 0), false);
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KCSAN_EXPECT_RW_BARRIER(atomic_set_release(&dummy, 0), true);
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KCSAN_EXPECT_RW_BARRIER(atomic_add(1, &dummy), false);
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KCSAN_EXPECT_RW_BARRIER(atomic_add_return(1, &dummy), true);
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KCSAN_EXPECT_RW_BARRIER(atomic_add_return_acquire(1, &dummy), false);
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KCSAN_EXPECT_RW_BARRIER(atomic_add_return_release(1, &dummy), true);
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KCSAN_EXPECT_RW_BARRIER(atomic_add_return_relaxed(1, &dummy), false);
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KCSAN_EXPECT_RW_BARRIER(atomic_fetch_add(1, &dummy), true);
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KCSAN_EXPECT_RW_BARRIER(atomic_fetch_add_acquire(1, &dummy), false);
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KCSAN_EXPECT_RW_BARRIER(atomic_fetch_add_release(1, &dummy), true);
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KCSAN_EXPECT_RW_BARRIER(atomic_fetch_add_relaxed(1, &dummy), false);
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KCSAN_EXPECT_RW_BARRIER(test_and_set_bit(0, &test_var), true);
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KCSAN_EXPECT_RW_BARRIER(test_and_clear_bit(0, &test_var), true);
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KCSAN_EXPECT_RW_BARRIER(test_and_change_bit(0, &test_var), true);
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KCSAN_EXPECT_RW_BARRIER(clear_bit_unlock(0, &test_var), true);
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KCSAN_EXPECT_RW_BARRIER(__clear_bit_unlock(0, &test_var), true);
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KCSAN_EXPECT_RW_BARRIER(clear_bit_unlock_is_negative_byte(0, &test_var), true);
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KCSAN_EXPECT_RW_BARRIER(arch_spin_lock(&arch_spinlock), false);
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KCSAN_EXPECT_RW_BARRIER(arch_spin_unlock(&arch_spinlock), true);
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KCSAN_EXPECT_RW_BARRIER(spin_lock(&spinlock), false);
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KCSAN_EXPECT_RW_BARRIER(spin_unlock(&spinlock), true);
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KCSAN_EXPECT_RW_BARRIER(mutex_lock(&mutex), false);
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KCSAN_EXPECT_RW_BARRIER(mutex_unlock(&mutex), true);
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kcsan_nestable_atomic_end();
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}
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/* Simple test with normal data race. */
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__no_kcsan
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static void test_basic(struct kunit *test)
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@ -1039,6 +1263,90 @@ static void test_1bit_value_change(struct kunit *test)
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KUNIT_EXPECT_TRUE(test, match);
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}
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__no_kcsan
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static void test_correct_barrier(struct kunit *test)
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{
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struct expect_report expect = {
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.access = {
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{ test_kernel_with_memorder, &test_var, sizeof(test_var), __KCSAN_ACCESS_RW(KCSAN_ACCESS_WRITE) },
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{ test_kernel_with_memorder, &test_var, sizeof(test_var), __KCSAN_ACCESS_RW(0) },
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},
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};
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bool match_expect = false;
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test_struct.val[0] = 0; /* init unlocked */
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begin_test_checks(test_kernel_with_memorder, test_kernel_with_memorder);
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do {
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match_expect = report_matches_any_reordered(&expect);
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} while (!end_test_checks(match_expect));
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KUNIT_EXPECT_FALSE(test, match_expect);
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}
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__no_kcsan
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static void test_missing_barrier(struct kunit *test)
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{
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struct expect_report expect = {
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.access = {
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{ test_kernel_wrong_memorder, &test_var, sizeof(test_var), __KCSAN_ACCESS_RW(KCSAN_ACCESS_WRITE) },
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{ test_kernel_wrong_memorder, &test_var, sizeof(test_var), __KCSAN_ACCESS_RW(0) },
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},
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};
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bool match_expect = false;
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test_struct.val[0] = 0; /* init unlocked */
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begin_test_checks(test_kernel_wrong_memorder, test_kernel_wrong_memorder);
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do {
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match_expect = report_matches_any_reordered(&expect);
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} while (!end_test_checks(match_expect));
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if (IS_ENABLED(CONFIG_KCSAN_WEAK_MEMORY))
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KUNIT_EXPECT_TRUE(test, match_expect);
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else
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KUNIT_EXPECT_FALSE(test, match_expect);
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}
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__no_kcsan
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static void test_atomic_builtins_correct_barrier(struct kunit *test)
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{
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struct expect_report expect = {
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.access = {
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{ test_kernel_atomic_builtin_with_memorder, &test_var, sizeof(test_var), __KCSAN_ACCESS_RW(KCSAN_ACCESS_WRITE) },
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{ test_kernel_atomic_builtin_with_memorder, &test_var, sizeof(test_var), __KCSAN_ACCESS_RW(0) },
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},
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};
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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.
|
||||
@ -1088,6 +1396,7 @@ static const void *nthreads_gen_params(const void *prev, char *desc)
|
||||
|
||||
#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),
|
||||
@ -1112,6 +1421,10 @@ static struct kunit_case kcsan_test_cases[] = {
|
||||
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),
|
||||
{},
|
||||
};
|
||||
|
||||
@ -1176,6 +1489,9 @@ static int test_init(struct kunit *test)
|
||||
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;
|
||||
|
||||
@ -1218,6 +1534,9 @@ 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;
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user