fb14f91305
Pointer auth protection of the block descriptor pointer is only supported in some constrained environments so we do actually need it to be configurable. We had made it non configurable in the first PR to protect block metadata because we believed that was an option but subsequently realised it does need to remain configurable. This PR revives the flags that permit this.
40 lines
2.9 KiB
Objective-C
40 lines
2.9 KiB
Objective-C
// RUN: %clang_cc1 -fobjc-arc -fblocks -fptrauth-calls -fptrauth-block-descriptor-pointers -triple arm64e-apple-ios -emit-llvm -o - %s | FileCheck %s
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// RUN: %clang_cc1 -fobjc-arc -fblocks -fptrauth-calls -triple arm64e-apple-ios -DNO_BLOCK_DESC_AUTH -emit-llvm -o - %s | FileCheck %s --check-prefix=NODESCRIPTORAUTH
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#ifndef NO_BLOCK_DESC_AUTH
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_Static_assert(__has_feature(ptrauth_signed_block_descriptors), "-fptrauth-block-descriptor-pointers should set ptrauth_signed_block_descriptors");
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#else
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_Static_assert(!__has_feature(ptrauth_signed_block_descriptors), "-fptrauth-block-descriptor-pointers should not be enabled by default");
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#endif
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void a() {
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// Test out a global block.
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void (^blk)(void) = ^{};
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}
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// CHECK: [[BLOCK_DESCRIPTOR_NAME:@"__block_descriptor_.*"]] = linkonce_odr hidden unnamed_addr constant { i64, i64, ptr, ptr } { i64 0, i64 32, ptr @.str, ptr null }
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// CHECK: @__block_literal_global = internal constant { ptr, i32, i32, ptr, ptr } { ptr @_NSConcreteGlobalBlock, i32 1342177280, i32 0, ptr ptrauth (ptr @__a_block_invoke, i32 0, i64 0, ptr getelementptr inbounds ({ ptr, i32, i32, ptr, ptr }, ptr @__block_literal_global, i32 0, i32 3)), ptr ptrauth (ptr [[BLOCK_DESCRIPTOR_NAME]], i32 2, i64 49339, ptr getelementptr inbounds ({ ptr, i32, i32, ptr, ptr }, ptr @__block_literal_global, i32 0, i32 4)) }
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// NODESCRIPTORAUTH: [[BLOCK_DESCRIPTOR_NAME:@"__block_descriptor_.*"]] = linkonce_odr hidden unnamed_addr constant { i64, i64, ptr, ptr } { i64 0, i64 32, ptr @.str, ptr null }
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// NODESCRIPTORAUTH: @__block_literal_global = internal constant { ptr, i32, i32, ptr, ptr } { ptr @_NSConcreteGlobalBlock, i32 1342177280, i32 0, ptr ptrauth (ptr @__a_block_invoke, i32 0, i64 0, ptr getelementptr inbounds ({ ptr, i32, i32, ptr, ptr }, ptr @__block_literal_global, i32 0, i32 3)), ptr [[BLOCK_DESCRIPTOR_NAME]] }
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void b(int p) {
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// CHECK-LABEL: define void @b
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// Test out a stack block.
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void (^blk)(void) = ^{(void)p;};
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// CHECK: [[BLOCK:%.*]] = alloca <{ ptr, i32, i32, ptr, ptr, i32 }>
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// CHECK: [[BLOCK_DESCRIPTOR_REF:%.*]] = getelementptr inbounds nuw <{ {{.*}} }>, ptr [[BLOCK]], i32 0, i32 4
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// CHECK: [[BLOCK_DESCRIPTOR_REF_INT:%.*]] = ptrtoint ptr [[BLOCK_DESCRIPTOR_REF]] to i64
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// CHECK: [[BLENDED:%.*]] = call i64 @llvm.ptrauth.blend(i64 [[BLOCK_DESCRIPTOR_REF_INT]], i64 49339)
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// CHECK: [[SIGNED_REF:%.*]] = call i64 @llvm.ptrauth.sign(i64 ptrtoint (ptr @"__block_descriptor_36_e5_v8\01?0l" to i64), i32 2, i64 [[BLENDED]])
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// CHECK: [[SIGNED_REF_PTR:%.*]] = inttoptr i64 [[SIGNED_REF]] to ptr
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// CHECK: store ptr [[SIGNED_REF_PTR]], ptr [[BLOCK_DESCRIPTOR_REF]]
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// NODESCRIPTORAUTH: [[BLOCK:%.*]] = alloca <{ ptr, i32, i32, ptr, ptr, i32 }>
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// NODESCRIPTORAUTH: [[BLOCK_DESCRIPTOR_REF:%.*]] = getelementptr inbounds nuw <{ {{.*}} }>, ptr [[BLOCK]], i32 0, i32 4
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// NODESCRIPTORAUTH: store ptr @"__block_descriptor_36_e5_v8\01?0l", ptr [[BLOCK_DESCRIPTOR_REF]]
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}
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