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authorBart Van Assche <bvanassche@acm.org>2022-08-26 19:21:15 +0300
committerKees Cook <keescook@chromium.org>2022-08-31 20:54:05 +0300
commitaddbeea6f50b5ac344331652dd7f35faf760969e (patch)
treed9c157a84b0eb746f15137a7f2653339fb9bf4b7 /lib
parent1c23f9e627a7b412978b4e852793c5e3c3efc555 (diff)
downloadlinux-addbeea6f50b5ac344331652dd7f35faf760969e.tar.xz
testing/selftests: Add tests for the is_signed_type() macro
Although not documented, is_signed_type() must support the 'bool' and pointer types next to scalar and enumeration types. Add a selftest that verifies that this macro handles all supported types correctly. Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Dan Williams <dan.j.williams@intel.com> Cc: Eric Dumazet <edumazet@google.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: Isabella Basso <isabbasso@riseup.net> Cc: "Jason A. Donenfeld" <Jason@zx2c4.com> Cc: Josh Poimboeuf <jpoimboe@kernel.org> Cc: Luc Van Oostenryck <luc.vanoostenryck@gmail.com> Cc: Masami Hiramatsu <mhiramat@kernel.org> Cc: Nathan Chancellor <nathan@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Rasmus Villemoes <linux@rasmusvillemoes.dk> Cc: Sander Vanheule <sander@svanheule.net> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Vlastimil Babka <vbabka@suse.cz> Cc: Yury Norov <yury.norov@gmail.com> Signed-off-by: Bart Van Assche <bvanassche@acm.org> Tested-by: Isabella Basso <isabbasso@riseup.net> Acked-by: Rasmus Villemoes <linux@rasmusvillemoes.dk> Signed-off-by: Kees Cook <keescook@chromium.org> Link: https://lore.kernel.org/r/20220826162116.1050972-2-bvanassche@acm.org
Diffstat (limited to 'lib')
-rw-r--r--lib/Kconfig.debug12
-rw-r--r--lib/Makefile1
-rw-r--r--lib/is_signed_type_kunit.c48
3 files changed, 61 insertions, 0 deletions
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 072e4b289c13..36455953d306 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -2506,6 +2506,18 @@ config MEMCPY_KUNIT_TEST
If unsure, say N.
+config IS_SIGNED_TYPE_KUNIT_TEST
+ tristate "Test is_signed_type() macro" if !KUNIT_ALL_TESTS
+ depends on KUNIT
+ default KUNIT_ALL_TESTS
+ help
+ Builds unit tests for the is_signed_type() macro.
+
+ For more information on KUnit and unit tests in general please refer
+ to the KUnit documentation in Documentation/dev-tools/kunit/.
+
+ If unsure, say N.
+
config OVERFLOW_KUNIT_TEST
tristate "Test check_*_overflow() functions at runtime" if !KUNIT_ALL_TESTS
depends on KUNIT
diff --git a/lib/Makefile b/lib/Makefile
index 5927d7fa0806..f545140ed9e7 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -377,6 +377,7 @@ obj-$(CONFIG_BITS_TEST) += test_bits.o
obj-$(CONFIG_CMDLINE_KUNIT_TEST) += cmdline_kunit.o
obj-$(CONFIG_SLUB_KUNIT_TEST) += slub_kunit.o
obj-$(CONFIG_MEMCPY_KUNIT_TEST) += memcpy_kunit.o
+obj-$(CONFIG_IS_SIGNED_TYPE_KUNIT_TEST) += is_signed_type_kunit.o
obj-$(CONFIG_OVERFLOW_KUNIT_TEST) += overflow_kunit.o
CFLAGS_stackinit_kunit.o += $(call cc-disable-warning, switch-unreachable)
obj-$(CONFIG_STACKINIT_KUNIT_TEST) += stackinit_kunit.o
diff --git a/lib/is_signed_type_kunit.c b/lib/is_signed_type_kunit.c
new file mode 100644
index 000000000000..f2eedb1f0935
--- /dev/null
+++ b/lib/is_signed_type_kunit.c
@@ -0,0 +1,48 @@
+// SPDX-License-Identifier: GPL-2.0 OR MIT
+/*
+ * ./tools/testing/kunit/kunit.py run is_signed_type [--raw_output]
+ */
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <kunit/test.h>
+#include <linux/overflow.h>
+
+enum unsigned_enum {
+ constant_a = 3,
+};
+
+enum signed_enum {
+ constant_b = -1,
+ constant_c = 2,
+};
+
+static void is_signed_type_test(struct kunit *test)
+{
+ KUNIT_EXPECT_EQ(test, is_signed_type(bool), false);
+ KUNIT_EXPECT_EQ(test, is_signed_type(signed char), true);
+ KUNIT_EXPECT_EQ(test, is_signed_type(unsigned char), false);
+ KUNIT_EXPECT_EQ(test, is_signed_type(int), true);
+ KUNIT_EXPECT_EQ(test, is_signed_type(unsigned int), false);
+ KUNIT_EXPECT_EQ(test, is_signed_type(long), true);
+ KUNIT_EXPECT_EQ(test, is_signed_type(unsigned long), false);
+ KUNIT_EXPECT_EQ(test, is_signed_type(long long), true);
+ KUNIT_EXPECT_EQ(test, is_signed_type(unsigned long long), false);
+ KUNIT_EXPECT_EQ(test, is_signed_type(enum unsigned_enum), false);
+ KUNIT_EXPECT_EQ(test, is_signed_type(enum signed_enum), true);
+ KUNIT_EXPECT_EQ(test, is_signed_type(void *), false);
+ KUNIT_EXPECT_EQ(test, is_signed_type(const char *), false);
+}
+
+static struct kunit_case is_signed_type_test_cases[] = {
+ KUNIT_CASE(is_signed_type_test),
+ {}
+};
+
+static struct kunit_suite is_signed_type_test_suite = {
+ .name = "is_signed_type",
+ .test_cases = is_signed_type_test_cases,
+};
+
+kunit_test_suite(is_signed_type_test_suite);
+
+MODULE_LICENSE("Dual MIT/GPL");