diff options
author | Marco Elver <elver@google.com> | 2021-11-30 14:44:18 +0300 |
---|---|---|
committer | Paul E. McKenney <paulmck@kernel.org> | 2021-12-10 03:42:27 +0300 |
commit | 7310bd1f3eb9445d96b030457d59d9f84375bdd5 (patch) | |
tree | c31803deb60d11a3d688782e9ce7782e54656430 /kernel/kcsan/kcsan_test.c | |
parent | 82eb6911d909cc8bd2838048f0dac7263ab63373 (diff) | |
download | linux-7310bd1f3eb9445d96b030457d59d9f84375bdd5.tar.xz |
kcsan: test: Match reordered or normal accesses
Due to reordering accesses with weak memory modeling, any access can now
appear as "(reordered)".
Match any permutation of accesses if CONFIG_KCSAN_WEAK_MEMORY=y, so that
we effectively match an access if it is denoted "(reordered)" or not.
Signed-off-by: Marco Elver <elver@google.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Diffstat (limited to 'kernel/kcsan/kcsan_test.c')
-rw-r--r-- | kernel/kcsan/kcsan_test.c | 92 |
1 files changed, 63 insertions, 29 deletions
diff --git a/kernel/kcsan/kcsan_test.c b/kernel/kcsan/kcsan_test.c index 6e3c2b8bc608..ec054879201b 100644 --- a/kernel/kcsan/kcsan_test.c +++ b/kernel/kcsan/kcsan_test.c @@ -151,7 +151,7 @@ struct expect_report { /* Check observed report matches information in @r. */ __no_kcsan -static bool report_matches(const struct expect_report *r) +static bool __report_matches(const struct expect_report *r) { const bool is_assert = (r->access[0].type | r->access[1].type) & KCSAN_ACCESS_ASSERT; bool ret = false; @@ -253,6 +253,40 @@ out: return ret; } +static __always_inline const struct expect_report * +__report_set_scoped(struct expect_report *r, int accesses) +{ + BUILD_BUG_ON(accesses > 3); + + if (accesses & 1) + r->access[0].type |= KCSAN_ACCESS_SCOPED; + else + r->access[0].type &= ~KCSAN_ACCESS_SCOPED; + + if (accesses & 2) + r->access[1].type |= KCSAN_ACCESS_SCOPED; + else + r->access[1].type &= ~KCSAN_ACCESS_SCOPED; + + return r; +} + +__no_kcsan +static bool report_matches_any_reordered(struct expect_report *r) +{ + return __report_matches(__report_set_scoped(r, 0)) || + __report_matches(__report_set_scoped(r, 1)) || + __report_matches(__report_set_scoped(r, 2)) || + __report_matches(__report_set_scoped(r, 3)); +} + +#ifdef CONFIG_KCSAN_WEAK_MEMORY +/* Due to reordering accesses, any access may appear as "(reordered)". */ +#define report_matches report_matches_any_reordered +#else +#define report_matches __report_matches +#endif + /* ===== Test kernels ===== */ static long test_sink; @@ -438,13 +472,13 @@ static noinline void test_kernel_xor_1bit(void) __no_kcsan static void test_basic(struct kunit *test) { - const struct expect_report expect = { + 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 }, }, }; - static const struct expect_report never = { + struct expect_report never = { .access = { { test_kernel_read, &test_var, sizeof(test_var), 0 }, { test_kernel_read, &test_var, sizeof(test_var), 0 }, @@ -469,14 +503,14 @@ static void test_basic(struct kunit *test) __no_kcsan static void test_concurrent_races(struct kunit *test) { - const struct expect_report expect = { + 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) }, }, }; - static const struct expect_report never = { + struct expect_report never = { .access = { { test_kernel_rmw_array, NULL, 0, 0 }, { test_kernel_rmw_array, NULL, 0, 0 }, @@ -498,13 +532,13 @@ static void test_concurrent_races(struct kunit *test) __no_kcsan static void test_novalue_change(struct kunit *test) { - const struct expect_report expect_rw = { + 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 }, }, }; - const struct expect_report expect_ww = { + 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 }, @@ -530,13 +564,13 @@ static void test_novalue_change(struct kunit *test) __no_kcsan static void test_novalue_change_exception(struct kunit *test) { - const struct expect_report expect_rw = { + 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 }, }, }; - const struct expect_report expect_ww = { + 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 }, @@ -556,7 +590,7 @@ static void test_novalue_change_exception(struct kunit *test) __no_kcsan static void test_unknown_origin(struct kunit *test) { - const struct expect_report expect = { + struct expect_report expect = { .access = { { test_kernel_read, &test_var, sizeof(test_var), 0 }, { NULL }, @@ -578,7 +612,7 @@ static void test_unknown_origin(struct kunit *test) __no_kcsan static void test_write_write_assume_atomic(struct kunit *test) { - const struct expect_report expect = { + 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 }, @@ -604,7 +638,7 @@ static void test_write_write_assume_atomic(struct kunit *test) __no_kcsan static void test_write_write_struct(struct kunit *test) { - const struct expect_report expect = { + 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 }, @@ -626,7 +660,7 @@ static void test_write_write_struct(struct kunit *test) __no_kcsan static void test_write_write_struct_part(struct kunit *test) { - const struct expect_report expect = { + 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 }, @@ -658,7 +692,7 @@ static void test_read_atomic_write_atomic(struct kunit *test) __no_kcsan static void test_read_plain_atomic_write(struct kunit *test) { - const struct expect_report expect = { + 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 }, @@ -679,7 +713,7 @@ static void test_read_plain_atomic_write(struct kunit *test) __no_kcsan static void test_read_plain_atomic_rmw(struct kunit *test) { - const struct expect_report expect = { + struct expect_report expect = { .access = { { test_kernel_read, &test_var, sizeof(test_var), 0 }, { test_kernel_atomic_rmw, &test_var, sizeof(test_var), @@ -701,13 +735,13 @@ static void test_read_plain_atomic_rmw(struct kunit *test) __no_kcsan static void test_zero_size_access(struct kunit *test) { - const struct expect_report expect = { + 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 }, }, }; - const struct expect_report never = { + 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 }, @@ -741,7 +775,7 @@ static void test_data_race(struct kunit *test) __no_kcsan static void test_assert_exclusive_writer(struct kunit *test) { - const struct expect_report expect = { + 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 }, @@ -759,7 +793,7 @@ static void test_assert_exclusive_writer(struct kunit *test) __no_kcsan static void test_assert_exclusive_access(struct kunit *test) { - const struct expect_report expect = { + 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 }, @@ -777,19 +811,19 @@ static void test_assert_exclusive_access(struct kunit *test) __no_kcsan static void test_assert_exclusive_access_writer(struct kunit *test) { - const struct expect_report expect_access_writer = { + 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 }, }, }; - const struct expect_report expect_access_access = { + 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 }, }, }; - const struct expect_report never = { + 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 }, @@ -813,7 +847,7 @@ static void test_assert_exclusive_access_writer(struct kunit *test) __no_kcsan static void test_assert_exclusive_bits_change(struct kunit *test) { - const struct expect_report expect = { + 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), @@ -844,13 +878,13 @@ static void test_assert_exclusive_bits_nochange(struct kunit *test) __no_kcsan static void test_assert_exclusive_writer_scoped(struct kunit *test) { - const struct expect_report expect_start = { + 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 }, }, }; - const struct expect_report expect_inscope = { + 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 }, @@ -871,16 +905,16 @@ static void test_assert_exclusive_writer_scoped(struct kunit *test) __no_kcsan static void test_assert_exclusive_access_scoped(struct kunit *test) { - const struct expect_report expect_start1 = { + 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 }, }, }; - const struct expect_report expect_start2 = { + struct expect_report expect_start2 = { .access = { expect_start1.access[0], expect_start1.access[0] }, }; - const struct expect_report expect_inscope = { + 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 }, @@ -985,7 +1019,7 @@ static void test_atomic_builtins(struct kunit *test) __no_kcsan static void test_1bit_value_change(struct kunit *test) { - const struct expect_report expect = { + 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) }, |