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| author | Evgeniy Stepanov <eugeni.stepanov@gmail.com> | 2017-06-16 00:18:29 +0000 |
|---|---|---|
| committer | Evgeniy Stepanov <eugeni.stepanov@gmail.com> | 2017-06-16 00:18:29 +0000 |
| commit | 4d4ee93d25640fafe73d512655cde20911782f8a (patch) | |
| tree | 45427836f47d0a48beec92a833f68c7f62d66d95 /llvm/lib/Transforms/IPO/CrossDSOCFI.cpp | |
| parent | 47d9a560de13fd194d38b37aa3bf5694d5be8443 (diff) | |
| download | bcm5719-llvm-4d4ee93d25640fafe73d512655cde20911782f8a.tar.gz bcm5719-llvm-4d4ee93d25640fafe73d512655cde20911782f8a.zip | |
[cfi] CFI-ICall for ThinLTO.
Implement ControlFlowIntegrity for indirect function calls in ThinLTO.
Design follows the RFC in llvm-dev, see
https://groups.google.com/d/msg/llvm-dev/MgUlaphu4Qc/kywu0AqjAQAJ
llvm-svn: 305533
Diffstat (limited to 'llvm/lib/Transforms/IPO/CrossDSOCFI.cpp')
| -rw-r--r-- | llvm/lib/Transforms/IPO/CrossDSOCFI.cpp | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/llvm/lib/Transforms/IPO/CrossDSOCFI.cpp b/llvm/lib/Transforms/IPO/CrossDSOCFI.cpp index 1b111de0615..d94aa5da856 100644 --- a/llvm/lib/Transforms/IPO/CrossDSOCFI.cpp +++ b/llvm/lib/Transforms/IPO/CrossDSOCFI.cpp @@ -95,6 +95,17 @@ void CrossDSOCFI::buildCFICheck(Module &M) { } } + NamedMDNode *CfiFunctionsMD = M.getNamedMetadata("cfi.functions"); + if (CfiFunctionsMD) { + for (auto Func : CfiFunctionsMD->operands()) { + assert(Func->getNumOperands() >= 2); + for (unsigned I = 2; I < Func->getNumOperands(); ++I) + if (ConstantInt *TypeId = + extractNumericTypeId(cast<MDNode>(Func->getOperand(I).get()))) + TypeIds.insert(TypeId->getZExtValue()); + } + } + LLVMContext &Ctx = M.getContext(); Constant *C = M.getOrInsertFunction( "__cfi_check", Type::getVoidTy(Ctx), Type::getInt64Ty(Ctx), |
