[libc++] Add a new job running the CFI sanitizer

Author: ldionne

.github/workflows/libcxx-build-and-test.yaml

@@ -155,6 +155,8 @@ jobs:
           machine: libcxx-self-hosted-linux
         - config: 'generic-asan'
           machine: libcxx-self-hosted-linux
+        - config: 'generic-cfisan'
+          machine: libcxx-self-hosted-linux
         - config: 'generic-tsan'
           machine: libcxx-self-hosted-linux
         - config: 'generic-ubsan'

libcxx/cmake/caches/Generic-cfisan.cmake

@@ -0,0 +1 @@
+set(LLVM_USE_SANITIZER "CFI" CACHE STRING "")

libcxx/utils/ci/run-buildbot

@@ -370,6 +370,11 @@ generic-ubsan)
     generate-cmake -C "${MONOREPO_ROOT}/libcxx/cmake/caches/Generic-ubsan.cmake"
     check-runtimes
 ;;
+generic-cfisan)
+    clean
+    generate-cmake -C "${MONOREPO_ROOT}/libcxx/cmake/caches/Generic-cfisan.cmake"
+    check-runtimes
+;;
 #
 # Various build configurations
 #

libcxx/utils/libcxx/test/params.py

@@ -303,6 +303,7 @@ def getSuitableClangTidy(cfg):
             "",
             "Address",
             "HWAddress",
+            "CFI",
             "Undefined",
             "Memory",
             "MemoryWithOrigins",
@@ -327,6 +328,9 @@ def getSuitableClangTidy(cfg):
                 AddFlag("-fsanitize=hwaddress") if sanitizer == "HWAddress" else None,
                 AddFeature("hwasan")            if sanitizer == "HWAddress" else None,
 
+                AddFlag("-fsanitize=cfi") if sanitizer == "CFI" else None,
+                AddFeature("cfi")         if sanitizer == "CFI" else None,
+
                 AddFlag("-fsanitize=memory")               if sanitizer in ["Memory", "MemoryWithOrigins"] else None,
                 AddFeature("msan")                         if sanitizer in ["Memory", "MemoryWithOrigins"] else None,
                 AddFlag("-fsanitize-memory-track-origins") if sanitizer == "MemoryWithOrigins" else None,