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[Clang] Fix 'counted_by' for nested struct pointers #110497

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Oct 3, 2024
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[Clang] Fix 'counted_by' for nested struct pointers #110497

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15b6932
[Clang] Fix 'counted_by' for nested struct pointers
Cydox Sep 29, 2024
0bdcbc6
[Clang] cleanup CodeGenFunction::EmitLoadOfCountedByField
Cydox Oct 1, 2024
841286c
no special case for MemberExpr, just LValue
Cydox Oct 2, 2024
60c3bd8
check for pointer, not LValue
Cydox Oct 3, 2024
06d39e3
check if StructBase is LValue
Cydox Oct 3, 2024
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14 changes: 5 additions & 9 deletions clang/lib/CodeGen/CGExpr.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -1161,19 +1161,15 @@ llvm::Value *CodeGenFunction::EmitLoadOfCountedByField(
return nullptr;

llvm::Value *Res = nullptr;
if (const auto *DRE = dyn_cast<DeclRefExpr>(StructBase)) {
Res = EmitDeclRefLValue(DRE).getPointer(*this);
Res = Builder.CreateAlignedLoad(ConvertType(DRE->getType()), Res,
getPointerAlign(), "dre.load");
} else if (const MemberExpr *ME = dyn_cast<MemberExpr>(StructBase)) {
LValue LV = EmitMemberExpr(ME);
Address Addr = LV.getAddress();
Res = Addr.emitRawPointer(*this);
} else if (StructBase->getType()->isPointerType()) {
if (StructBase->getType()->isPointerType()) {
LValueBaseInfo BaseInfo;
TBAAAccessInfo TBAAInfo;
Address Addr = EmitPointerWithAlignment(StructBase, &BaseInfo, &TBAAInfo);
Res = Addr.emitRawPointer(*this);
} else if (const MemberExpr *ME = dyn_cast<MemberExpr>(StructBase)) {
LValue LV = EmitMemberExpr(ME);
Address Addr = LV.getAddress();
Res = Addr.emitRawPointer(*this);
} else {
return nullptr;
}
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62 changes: 62 additions & 0 deletions clang/test/CodeGen/attr-counted-by-pr110385.c
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@@ -0,0 +1,62 @@
// NOTE: Assertions have been autogenerated by utils/update_cc_test_checks.py UTC_ARGS: --version 4
// RUN: %clang_cc1 -triple x86_64-unknown-linux-gnu -O2 -Wno-missing-declarations -emit-llvm -o - %s | FileCheck %s

// See #110385
// Based on reproducer from Kees Cook:
// https://lore.kernel.org/all/202409170436.C3C6E7F7A@keescook/

struct variable {
int a;
int b;
int length;
short array[] __attribute__((counted_by(length)));
};

struct bucket {
int a;
struct variable *growable;
int b;
};

struct bucket2 {
int a;
struct variable growable;
};

void init(void * __attribute__((pass_dynamic_object_size(0))));

// CHECK-LABEL: define dso_local void @test1(
// CHECK-SAME: ptr nocapture noundef readonly [[FOO:%.*]]) local_unnamed_addr #[[ATTR0:[0-9]+]] {
// CHECK-NEXT: entry:
// CHECK-NEXT: [[GROWABLE:%.*]] = getelementptr inbounds nuw i8, ptr [[FOO]], i64 8
// CHECK-NEXT: [[TMP0:%.*]] = load ptr, ptr [[GROWABLE]], align 8, !tbaa [[TBAA2:![0-9]+]]
// CHECK-NEXT: [[ARRAY:%.*]] = getelementptr inbounds nuw i8, ptr [[TMP0]], i64 12
// CHECK-NEXT: [[DOT_COUNTED_BY_GEP:%.*]] = getelementptr inbounds i8, ptr [[TMP0]], i64 8
// CHECK-NEXT: [[DOT_COUNTED_BY_LOAD:%.*]] = load i32, ptr [[DOT_COUNTED_BY_GEP]], align 4
// CHECK-NEXT: [[TMP1:%.*]] = sext i32 [[DOT_COUNTED_BY_LOAD]] to i64
// CHECK-NEXT: [[TMP2:%.*]] = shl nsw i64 [[TMP1]], 1
// CHECK-NEXT: [[TMP3:%.*]] = icmp sgt i32 [[DOT_COUNTED_BY_LOAD]], -1
// CHECK-NEXT: [[TMP4:%.*]] = select i1 [[TMP3]], i64 [[TMP2]], i64 0
// CHECK-NEXT: tail call void @init(ptr noundef nonnull [[ARRAY]], i64 noundef [[TMP4]]) #[[ATTR2:[0-9]+]]
// CHECK-NEXT: ret void
//
void test1(struct bucket *foo) {
init(foo->growable->array);
}

// CHECK-LABEL: define dso_local void @test2(
// CHECK-SAME: ptr noundef [[FOO:%.*]]) local_unnamed_addr #[[ATTR0]] {
// CHECK-NEXT: entry:
// CHECK-NEXT: [[ARRAY:%.*]] = getelementptr inbounds nuw i8, ptr [[FOO]], i64 16
// CHECK-NEXT: [[DOT_COUNTED_BY_GEP:%.*]] = getelementptr inbounds i8, ptr [[FOO]], i64 12
// CHECK-NEXT: [[DOT_COUNTED_BY_LOAD:%.*]] = load i32, ptr [[DOT_COUNTED_BY_GEP]], align 4
// CHECK-NEXT: [[TMP0:%.*]] = sext i32 [[DOT_COUNTED_BY_LOAD]] to i64
// CHECK-NEXT: [[TMP1:%.*]] = shl nsw i64 [[TMP0]], 1
// CHECK-NEXT: [[TMP2:%.*]] = icmp sgt i32 [[DOT_COUNTED_BY_LOAD]], -1
// CHECK-NEXT: [[TMP3:%.*]] = select i1 [[TMP2]], i64 [[TMP1]], i64 0
// CHECK-NEXT: tail call void @init(ptr noundef nonnull [[ARRAY]], i64 noundef [[TMP3]]) #[[ATTR2]]
// CHECK-NEXT: ret void
//
void test2(struct bucket2 *foo) {
init(foo->growable.array);
}
80 changes: 40 additions & 40 deletions clang/test/CodeGen/attr-counted-by.c
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Original file line number Diff line number Diff line change
Expand Up @@ -318,45 +318,45 @@ size_t test3_bdos(struct annotated *p) {
// SANITIZE-WITH-ATTR-NEXT: [[CONV1:%.*]] = select i1 [[TMP2]], i32 [[TMP5]], i32 0
// SANITIZE-WITH-ATTR-NEXT: [[ARRAYIDX:%.*]] = getelementptr inbounds [0 x i32], ptr [[ARRAY]], i64 0, i64 [[IDXPROM]]
// SANITIZE-WITH-ATTR-NEXT: store i32 [[CONV1]], ptr [[ARRAYIDX]], align 4, !tbaa [[TBAA4]]
// SANITIZE-WITH-ATTR-NEXT: [[DOT_COUNTED_BY_LOAD7:%.*]] = load i32, ptr [[DOT_COUNTED_BY_GEP]], align 4
// SANITIZE-WITH-ATTR-NEXT: [[DOT_COUNTED_BY_LOAD6:%.*]] = load i32, ptr [[DOT_COUNTED_BY_GEP]], align 4
// SANITIZE-WITH-ATTR-NEXT: [[ADD:%.*]] = add nsw i32 [[INDEX]], 1
// SANITIZE-WITH-ATTR-NEXT: [[IDXPROM13:%.*]] = sext i32 [[ADD]] to i64
// SANITIZE-WITH-ATTR-NEXT: [[TMP6:%.*]] = zext i32 [[DOT_COUNTED_BY_LOAD7]] to i64, !nosanitize [[META2]]
// SANITIZE-WITH-ATTR-NEXT: [[TMP7:%.*]] = icmp ult i64 [[IDXPROM13]], [[TMP6]], !nosanitize [[META2]]
// SANITIZE-WITH-ATTR-NEXT: br i1 [[TMP7]], label [[CONT20:%.*]], label [[HANDLER_OUT_OF_BOUNDS16:%.*]], !prof [[PROF3]], !nosanitize [[META2]]
// SANITIZE-WITH-ATTR: handler.out_of_bounds16:
// SANITIZE-WITH-ATTR-NEXT: tail call void @__ubsan_handle_out_of_bounds_abort(ptr nonnull @[[GLOB6:[0-9]+]], i64 [[IDXPROM13]]) #[[ATTR10]], !nosanitize [[META2]]
// SANITIZE-WITH-ATTR-NEXT: [[IDXPROM12:%.*]] = sext i32 [[ADD]] to i64
// SANITIZE-WITH-ATTR-NEXT: [[TMP6:%.*]] = zext i32 [[DOT_COUNTED_BY_LOAD6]] to i64, !nosanitize [[META2]]
// SANITIZE-WITH-ATTR-NEXT: [[TMP7:%.*]] = icmp ult i64 [[IDXPROM12]], [[TMP6]], !nosanitize [[META2]]
// SANITIZE-WITH-ATTR-NEXT: br i1 [[TMP7]], label [[CONT19:%.*]], label [[HANDLER_OUT_OF_BOUNDS15:%.*]], !prof [[PROF3]], !nosanitize [[META2]]
// SANITIZE-WITH-ATTR: handler.out_of_bounds15:
// SANITIZE-WITH-ATTR-NEXT: tail call void @__ubsan_handle_out_of_bounds_abort(ptr nonnull @[[GLOB6:[0-9]+]], i64 [[IDXPROM12]]) #[[ATTR10]], !nosanitize [[META2]]
// SANITIZE-WITH-ATTR-NEXT: unreachable, !nosanitize [[META2]]
// SANITIZE-WITH-ATTR: cont20:
// SANITIZE-WITH-ATTR-NEXT: [[TMP8:%.*]] = icmp sgt i32 [[DOT_COUNTED_BY_LOAD7]], 3
// SANITIZE-WITH-ATTR-NEXT: [[TMP9:%.*]] = shl i32 [[DOT_COUNTED_BY_LOAD7]], 2
// SANITIZE-WITH-ATTR: cont19:
// SANITIZE-WITH-ATTR-NEXT: [[TMP8:%.*]] = icmp sgt i32 [[DOT_COUNTED_BY_LOAD6]], 3
// SANITIZE-WITH-ATTR-NEXT: [[TMP9:%.*]] = shl i32 [[DOT_COUNTED_BY_LOAD6]], 2
// SANITIZE-WITH-ATTR-NEXT: [[TMP10:%.*]] = add i32 [[TMP9]], 240
// SANITIZE-WITH-ATTR-NEXT: [[TMP11:%.*]] = and i32 [[TMP10]], 252
// SANITIZE-WITH-ATTR-NEXT: [[CONV9:%.*]] = select i1 [[TMP8]], i32 [[TMP11]], i32 0
// SANITIZE-WITH-ATTR-NEXT: [[ARRAYIDX18:%.*]] = getelementptr inbounds [0 x i32], ptr [[ARRAY]], i64 0, i64 [[IDXPROM13]]
// SANITIZE-WITH-ATTR-NEXT: store i32 [[CONV9]], ptr [[ARRAYIDX18]], align 4, !tbaa [[TBAA4]]
// SANITIZE-WITH-ATTR-NEXT: [[DOT_COUNTED_BY_LOAD23:%.*]] = load i32, ptr [[DOT_COUNTED_BY_GEP]], align 4
// SANITIZE-WITH-ATTR-NEXT: [[ADD29:%.*]] = add nsw i32 [[INDEX]], 2
// SANITIZE-WITH-ATTR-NEXT: [[IDXPROM30:%.*]] = sext i32 [[ADD29]] to i64
// SANITIZE-WITH-ATTR-NEXT: [[TMP12:%.*]] = zext i32 [[DOT_COUNTED_BY_LOAD23]] to i64, !nosanitize [[META2]]
// SANITIZE-WITH-ATTR-NEXT: [[TMP13:%.*]] = icmp ult i64 [[IDXPROM30]], [[TMP12]], !nosanitize [[META2]]
// SANITIZE-WITH-ATTR-NEXT: br i1 [[TMP13]], label [[CONT37:%.*]], label [[HANDLER_OUT_OF_BOUNDS33:%.*]], !prof [[PROF3]], !nosanitize [[META2]]
// SANITIZE-WITH-ATTR: handler.out_of_bounds33:
// SANITIZE-WITH-ATTR-NEXT: tail call void @__ubsan_handle_out_of_bounds_abort(ptr nonnull @[[GLOB7:[0-9]+]], i64 [[IDXPROM30]]) #[[ATTR10]], !nosanitize [[META2]]
// SANITIZE-WITH-ATTR-NEXT: [[CONV8:%.*]] = select i1 [[TMP8]], i32 [[TMP11]], i32 0
// SANITIZE-WITH-ATTR-NEXT: [[ARRAYIDX17:%.*]] = getelementptr inbounds [0 x i32], ptr [[ARRAY]], i64 0, i64 [[IDXPROM12]]
// SANITIZE-WITH-ATTR-NEXT: store i32 [[CONV8]], ptr [[ARRAYIDX17]], align 4, !tbaa [[TBAA4]]
// SANITIZE-WITH-ATTR-NEXT: [[DOT_COUNTED_BY_LOAD21:%.*]] = load i32, ptr [[DOT_COUNTED_BY_GEP]], align 4
// SANITIZE-WITH-ATTR-NEXT: [[ADD27:%.*]] = add nsw i32 [[INDEX]], 2
// SANITIZE-WITH-ATTR-NEXT: [[IDXPROM28:%.*]] = sext i32 [[ADD27]] to i64
// SANITIZE-WITH-ATTR-NEXT: [[TMP12:%.*]] = zext i32 [[DOT_COUNTED_BY_LOAD21]] to i64, !nosanitize [[META2]]
// SANITIZE-WITH-ATTR-NEXT: [[TMP13:%.*]] = icmp ult i64 [[IDXPROM28]], [[TMP12]], !nosanitize [[META2]]
// SANITIZE-WITH-ATTR-NEXT: br i1 [[TMP13]], label [[CONT35:%.*]], label [[HANDLER_OUT_OF_BOUNDS31:%.*]], !prof [[PROF3]], !nosanitize [[META2]]
// SANITIZE-WITH-ATTR: handler.out_of_bounds31:
// SANITIZE-WITH-ATTR-NEXT: tail call void @__ubsan_handle_out_of_bounds_abort(ptr nonnull @[[GLOB7:[0-9]+]], i64 [[IDXPROM28]]) #[[ATTR10]], !nosanitize [[META2]]
// SANITIZE-WITH-ATTR-NEXT: unreachable, !nosanitize [[META2]]
// SANITIZE-WITH-ATTR: cont37:
// SANITIZE-WITH-ATTR-NEXT: [[ARRAYIDX35:%.*]] = getelementptr inbounds [0 x i32], ptr [[ARRAY]], i64 0, i64 [[IDXPROM30]]
// SANITIZE-WITH-ATTR: cont35:
// SANITIZE-WITH-ATTR-NEXT: [[ARRAYIDX33:%.*]] = getelementptr inbounds [0 x i32], ptr [[ARRAY]], i64 0, i64 [[IDXPROM28]]
// SANITIZE-WITH-ATTR-NEXT: [[TMP14:%.*]] = icmp sgt i32 [[FAM_IDX]], -1
// SANITIZE-WITH-ATTR-NEXT: [[TMP15:%.*]] = sext i32 [[DOT_COUNTED_BY_LOAD23]] to i64
// SANITIZE-WITH-ATTR-NEXT: [[TMP15:%.*]] = sext i32 [[DOT_COUNTED_BY_LOAD21]] to i64
// SANITIZE-WITH-ATTR-NEXT: [[TMP16:%.*]] = sext i32 [[FAM_IDX]] to i64
// SANITIZE-WITH-ATTR-NEXT: [[TMP17:%.*]] = sub nsw i64 [[TMP15]], [[TMP16]]
// SANITIZE-WITH-ATTR-NEXT: [[TMP18:%.*]] = icmp sgt i64 [[TMP17]], -1
// SANITIZE-WITH-ATTR-NEXT: [[TMP19:%.*]] = and i1 [[TMP14]], [[TMP18]]
// SANITIZE-WITH-ATTR-NEXT: [[DOTTR:%.*]] = trunc i64 [[TMP17]] to i32
// SANITIZE-WITH-ATTR-NEXT: [[TMP20:%.*]] = shl i32 [[DOTTR]], 2
// SANITIZE-WITH-ATTR-NEXT: [[TMP21:%.*]] = and i32 [[TMP20]], 252
// SANITIZE-WITH-ATTR-NEXT: [[CONV25:%.*]] = select i1 [[TMP19]], i32 [[TMP21]], i32 0
// SANITIZE-WITH-ATTR-NEXT: store i32 [[CONV25]], ptr [[ARRAYIDX35]], align 4, !tbaa [[TBAA4]]
// SANITIZE-WITH-ATTR-NEXT: [[CONV23:%.*]] = select i1 [[TMP19]], i32 [[TMP21]], i32 0
// SANITIZE-WITH-ATTR-NEXT: store i32 [[CONV23]], ptr [[ARRAYIDX33]], align 4, !tbaa [[TBAA4]]
// SANITIZE-WITH-ATTR-NEXT: ret void
//
// NO-SANITIZE-WITH-ATTR-LABEL: define dso_local void @test4(
Expand All @@ -373,18 +373,18 @@ size_t test3_bdos(struct annotated *p) {
// NO-SANITIZE-WITH-ATTR-NEXT: [[IDXPROM:%.*]] = sext i32 [[INDEX]] to i64
// NO-SANITIZE-WITH-ATTR-NEXT: [[ARRAYIDX:%.*]] = getelementptr inbounds [0 x i32], ptr [[ARRAY]], i64 0, i64 [[IDXPROM]]
// NO-SANITIZE-WITH-ATTR-NEXT: store i32 [[CONV1]], ptr [[ARRAYIDX]], align 4, !tbaa [[TBAA2]]
// NO-SANITIZE-WITH-ATTR-NEXT: [[DOT_COUNTED_BY_LOAD4:%.*]] = load i32, ptr [[DOT_COUNTED_BY_GEP]], align 4
// NO-SANITIZE-WITH-ATTR-NEXT: [[TMP4:%.*]] = shl i32 [[DOT_COUNTED_BY_LOAD4]], 2
// NO-SANITIZE-WITH-ATTR-NEXT: [[DOT_COUNTED_BY_LOAD3:%.*]] = load i32, ptr [[DOT_COUNTED_BY_GEP]], align 4
// NO-SANITIZE-WITH-ATTR-NEXT: [[TMP4:%.*]] = shl i32 [[DOT_COUNTED_BY_LOAD3]], 2
// NO-SANITIZE-WITH-ATTR-NEXT: [[TMP5:%.*]] = add i32 [[TMP4]], 240
// NO-SANITIZE-WITH-ATTR-NEXT: [[TMP6:%.*]] = icmp sgt i32 [[DOT_COUNTED_BY_LOAD4]], 3
// NO-SANITIZE-WITH-ATTR-NEXT: [[TMP6:%.*]] = icmp sgt i32 [[DOT_COUNTED_BY_LOAD3]], 3
// NO-SANITIZE-WITH-ATTR-NEXT: [[TMP7:%.*]] = and i32 [[TMP5]], 252
// NO-SANITIZE-WITH-ATTR-NEXT: [[CONV6:%.*]] = select i1 [[TMP6]], i32 [[TMP7]], i32 0
// NO-SANITIZE-WITH-ATTR-NEXT: [[CONV5:%.*]] = select i1 [[TMP6]], i32 [[TMP7]], i32 0
// NO-SANITIZE-WITH-ATTR-NEXT: [[ADD:%.*]] = add nsw i32 [[INDEX]], 1
// NO-SANITIZE-WITH-ATTR-NEXT: [[IDXPROM8:%.*]] = sext i32 [[ADD]] to i64
// NO-SANITIZE-WITH-ATTR-NEXT: [[ARRAYIDX9:%.*]] = getelementptr inbounds [0 x i32], ptr [[ARRAY]], i64 0, i64 [[IDXPROM8]]
// NO-SANITIZE-WITH-ATTR-NEXT: store i32 [[CONV6]], ptr [[ARRAYIDX9]], align 4, !tbaa [[TBAA2]]
// NO-SANITIZE-WITH-ATTR-NEXT: [[DOT_COUNTED_BY_LOAD12:%.*]] = load i32, ptr [[DOT_COUNTED_BY_GEP]], align 4
// NO-SANITIZE-WITH-ATTR-NEXT: [[TMP8:%.*]] = sext i32 [[DOT_COUNTED_BY_LOAD12]] to i64
// NO-SANITIZE-WITH-ATTR-NEXT: [[IDXPROM7:%.*]] = sext i32 [[ADD]] to i64
// NO-SANITIZE-WITH-ATTR-NEXT: [[ARRAYIDX8:%.*]] = getelementptr inbounds [0 x i32], ptr [[ARRAY]], i64 0, i64 [[IDXPROM7]]
// NO-SANITIZE-WITH-ATTR-NEXT: store i32 [[CONV5]], ptr [[ARRAYIDX8]], align 4, !tbaa [[TBAA2]]
// NO-SANITIZE-WITH-ATTR-NEXT: [[DOT_COUNTED_BY_LOAD10:%.*]] = load i32, ptr [[DOT_COUNTED_BY_GEP]], align 4
// NO-SANITIZE-WITH-ATTR-NEXT: [[TMP8:%.*]] = sext i32 [[DOT_COUNTED_BY_LOAD10]] to i64
// NO-SANITIZE-WITH-ATTR-NEXT: [[TMP9:%.*]] = sext i32 [[FAM_IDX]] to i64
// NO-SANITIZE-WITH-ATTR-NEXT: [[TMP10:%.*]] = sub nsw i64 [[TMP8]], [[TMP9]]
// NO-SANITIZE-WITH-ATTR-NEXT: [[TMP11:%.*]] = icmp sgt i64 [[TMP10]], -1
Expand All @@ -393,11 +393,11 @@ size_t test3_bdos(struct annotated *p) {
// NO-SANITIZE-WITH-ATTR-NEXT: [[DOTTR:%.*]] = trunc i64 [[TMP10]] to i32
// NO-SANITIZE-WITH-ATTR-NEXT: [[TMP14:%.*]] = shl i32 [[DOTTR]], 2
// NO-SANITIZE-WITH-ATTR-NEXT: [[TMP15:%.*]] = and i32 [[TMP14]], 252
// NO-SANITIZE-WITH-ATTR-NEXT: [[CONV14:%.*]] = select i1 [[TMP13]], i32 [[TMP15]], i32 0
// NO-SANITIZE-WITH-ATTR-NEXT: [[ADD16:%.*]] = add nsw i32 [[INDEX]], 2
// NO-SANITIZE-WITH-ATTR-NEXT: [[IDXPROM17:%.*]] = sext i32 [[ADD16]] to i64
// NO-SANITIZE-WITH-ATTR-NEXT: [[ARRAYIDX18:%.*]] = getelementptr inbounds [0 x i32], ptr [[ARRAY]], i64 0, i64 [[IDXPROM17]]
// NO-SANITIZE-WITH-ATTR-NEXT: store i32 [[CONV14]], ptr [[ARRAYIDX18]], align 4, !tbaa [[TBAA2]]
// NO-SANITIZE-WITH-ATTR-NEXT: [[CONV12:%.*]] = select i1 [[TMP13]], i32 [[TMP15]], i32 0
// NO-SANITIZE-WITH-ATTR-NEXT: [[ADD14:%.*]] = add nsw i32 [[INDEX]], 2
// NO-SANITIZE-WITH-ATTR-NEXT: [[IDXPROM15:%.*]] = sext i32 [[ADD14]] to i64
// NO-SANITIZE-WITH-ATTR-NEXT: [[ARRAYIDX16:%.*]] = getelementptr inbounds [0 x i32], ptr [[ARRAY]], i64 0, i64 [[IDXPROM15]]
// NO-SANITIZE-WITH-ATTR-NEXT: store i32 [[CONV12]], ptr [[ARRAYIDX16]], align 4, !tbaa [[TBAA2]]
// NO-SANITIZE-WITH-ATTR-NEXT: ret void
//
// SANITIZE-WITHOUT-ATTR-LABEL: define dso_local void @test4(
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