370d7ce580
Pointer field protection is a use-after-free vulnerability mitigation that works by changing how data structures' pointer fields are stored in memory. For more information, see the RFC: https://discourse.llvm.org/t/rfc-structure-protection-a-family-of-uaf-mitigation-techniques/85555 Reviewers: fmayer, ojhunt Pull Request: https://github.com/llvm/llvm-project/pull/172119
20 lines
719 B
C++
20 lines
719 B
C++
// RUN: %clang_cc1 -triple aarch64-linux -fexperimental-pointer-field-protection-abi -fexperimental-pointer-field-protection-tagged -emit-llvm -o - %s | FileCheck %s
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struct S {
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void *p;
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private:
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int private_data;
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};
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// CHECK-LABEL: null_init
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void null_init() {
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// Check that null initialization was correctly applied to the pointer field.
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// CHECK: %s = alloca %struct.S, align 8
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// CHECK: call void @llvm.memset.p0.i64(ptr align 8 %s, i8 0, i64 16, i1 false)
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// CHECK: %0 = getelementptr inbounds i8, ptr %s, i64 0
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// CHECK: %1 = call ptr @llvm.protected.field.ptr.p0(ptr %0, i64 29832, i1 true) [ "deactivation-symbol"(ptr @__pfp_ds__ZTS1S.p) ]
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// CHECK: store ptr null, ptr %1, align 8
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S s{};
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}
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