cacd3e73d7
The KCFI sanitizer emits "kcfi" operand bundles to indirect call instructions, which the LLVM back-end lowers into an architecture-specific type check with a known machine instruction sequence. Currently, KCFI operand bundle lowering is supported only on 64-bit X86 and AArch64 architectures. As a lightweight forward-edge CFI implementation that doesn't require LTO is also useful for non-Linux low-level targets on other machine architectures, add a generic KCFI operand bundle lowering pass that's only used when back-end lowering support is not available and allows -fsanitize=kcfi to be enabled in Clang on all architectures. This relands commit eb2a57ebc7aaad551af30462097a9e06c96db925 with fixes. Reviewed By: nickdesaulniers, MaskRay Differential Revision: https://reviews.llvm.org/D135411
13 lines
370 B
LLVM
13 lines
370 B
LLVM
; RUN: not opt -S -passes=kcfi %s 2>&1 | FileCheck %s
|
|
|
|
; CHECK: error: -fpatchable-function-entry=N,M, where M>0 is not compatible with -fsanitize=kcfi on this target
|
|
define void @f1(ptr noundef %x) #0 {
|
|
call void %x() [ "kcfi"(i32 12345678) ]
|
|
ret void
|
|
}
|
|
|
|
attributes #0 = { "patchable-function-prefix"="1" }
|
|
|
|
!llvm.module.flags = !{!0}
|
|
!0 = !{i32 4, !"kcfi", i32 1}
|