[PATCH v4 03/35] compiler-context-analysis: Add test stub
Marco Elver <[email protected]>
| Newsgroups | org.kernel.vger.linux-sparse,dev.linux.lists.llvm,org.kernel.vger.linux-crypto,org.kernel.vger.linux-doc,org.kernel.vger.linux-kbuild,org.kernel.vger.linux-kernel,org.kernel.vger.linux-security-module,org.kernel.vger.linux-wireless,org.kernel.vger.rcu,org.kvack.linux-mm |
|---|---|
| Message-ID | <[email protected]> |
Add a simple test stub where we will add common supported patterns that should not generate false positive of each new supported context guard. Signed-off-by: Marco Elver <[email protected]> --- v4: * Rename capability -> context analysis. --- lib/Kconfig.debug | 14 ++++++++++++++ lib/Makefile | 3 +++ lib/test_context-analysis.c | 18 ++++++++++++++++++ 3 files changed, 35 insertions(+) create mode 100644 lib/test_context-analysis.c diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug index 696e2a148a15..0c499d22407c 100644 --- a/lib/Kconfig.debug +++ b/lib/Kconfig.debug @@ -2833,6 +2833,20 @@ config LINEAR_RANGES_TEST If unsure, say N. +config CONTEXT_ANALYSIS_TEST + bool "Compiler context-analysis warnings test" + depends on EXPERT + help + This builds the test for compiler-based context analysis. The test + does not add executable code to the kernel, but is meant to test that + common patterns supported by the analysis do not result in false + positive warnings. + + When adding support for new context guards, it is strongly recommended + to add supported patterns to this test. + + If unsure, say N. + config CMDLINE_KUNIT_TEST tristate "KUnit test for cmdline API" if !KUNIT_ALL_TESTS depends on KUNIT diff --git a/lib/Makefile b/lib/Makefile index 1ab2c4be3b66..59ed5f881bcb 100644 --- a/lib/Makefile +++ b/lib/Makefile @@ -329,4 +329,7 @@ obj-$(CONFIG_GENERIC_LIB_DEVMEM_IS_ALLOWED) += devmem_is_allowed.o obj-$(CONFIG_FIRMWARE_TABLE) += fw_table.o +CONTEXT_ANALYSIS_test_context-analysis.o := y +obj-$(CONFIG_CONTEXT_ANALYSIS_TEST) += test_context-analysis.o + subdir-$(CONFIG_FORTIFY_SOURCE) += test_fortify diff --git a/lib/test_context-analysis.c b/lib/test_context-analysis.c new file mode 100644 index 000000000000..68f075dec0e0 --- /dev/null +++ b/lib/test_context-analysis.c @@ -0,0 +1,18 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Compile-only tests for common patterns that should not generate false + * positive errors when compiled with Clang's context analysis. + */ + +#include <linux/build_bug.h> + +/* + * Test that helper macros work as expected. + */ +static void __used test_common_helpers(void) +{ + BUILD_BUG_ON(context_unsafe(3) != 3); /* plain expression */ + BUILD_BUG_ON(context_unsafe((void)2; 3) != 3); /* does not swallow semi-colon */ + BUILD_BUG_ON(context_unsafe((void)2, 3) != 3); /* does not swallow commas */ + context_unsafe(do { } while (0)); /* works with void statements */ +} -- 2.52.0.rc1.455.g30608eb744-goog