Minimal runtime for UBSan.
Summary:
An implementation of ubsan runtime library suitable for use in production.
Minimal attack surface.
* No stack traces.
* Definitely no C++ demangling.
* No UBSAN_OPTIONS=log_file=/path (very suid-unfriendly). And no UBSAN_OPTIONS in general.
* as simple as possible
Minimal CPU and RAM overhead.
* Source locations unnecessary in the presence of (split) debug info.
* Values and types (as in A+B overflows T) can be reconstructed from register/stack dumps, once you know what type of error you are looking at.
* above two items save 3% binary size.
When UBSan is used with -ftrap-function=abort, sometimes it is hard to reason about failures. This library replaces abort with a slightly more informative message without much extra overhead. Since ubsan interface in not stable, this code must reside in compiler-rt.
Reviewers: pcc, kcc
Subscribers: srhines, mgorny, aprantl, krytarowski, llvm-commits
Differential Revision: https://reviews.llvm.org/D36810
llvm-svn: 312029
diff --git a/clang/lib/Driver/ToolChains/CommonArgs.cpp b/clang/lib/Driver/ToolChains/CommonArgs.cpp
index 690f3b3..d052bb2 100644
--- a/clang/lib/Driver/ToolChains/CommonArgs.cpp
+++ b/clang/lib/Driver/ToolChains/CommonArgs.cpp
@@ -555,6 +555,7 @@
if (SanArgs.needsAsanRt() && SanArgs.needsSharedAsanRt()) {
SharedRuntimes.push_back("asan");
}
+
// The stats_client library is also statically linked into DSOs.
if (SanArgs.needsStatsRt())
StaticRuntimes.push_back("stats_client");
@@ -588,9 +589,13 @@
StaticRuntimes.push_back("tsan_cxx");
}
if (SanArgs.needsUbsanRt()) {
- StaticRuntimes.push_back("ubsan_standalone");
- if (SanArgs.linkCXXRuntimes())
- StaticRuntimes.push_back("ubsan_standalone_cxx");
+ if (SanArgs.requiresMinimalRuntime()) {
+ StaticRuntimes.push_back("ubsan_minimal");
+ } else {
+ StaticRuntimes.push_back("ubsan_standalone");
+ if (SanArgs.linkCXXRuntimes())
+ StaticRuntimes.push_back("ubsan_standalone_cxx");
+ }
}
if (SanArgs.needsSafeStackRt()) {
NonWholeStaticRuntimes.push_back("safestack");