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[Clang] Fix 'counted_by' for nested struct pointers (llvm#110497)
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Fix counted_by attribute for cases where the flexible array member is
accessed through struct pointer inside another struct:

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

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

__builtin_dynamic_object_size(p->growable->array, 0);

This commit makes sure that if the StructBase is both a MemberExpr and a
pointer, it is treated as a pointer. Otherwise clang will generate to
code to access the address of p->growable intead of loading the value of
p->growable->length.

Fixes llvm#110385
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@Cydox
Cydox authored Oct 3, 2024
1 parent d15e53c commit 882457a
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16 changes: 7 additions & 9 deletions clang/lib/CodeGen/CGExpr.cpp
View file
Original file line number Diff line number Diff line change
Expand Up @@ -1095,6 +1095,8 @@ class StructAccessBase
return Visit(E->getBase());
}
const Expr *VisitCastExpr(const CastExpr *E) {
if (E->getCastKind() == CK_LValueToRValue)
return E;
return Visit(E->getSubExpr());
}
const Expr *VisitParenExpr(const ParenExpr *E) {
Expand Down Expand Up @@ -1161,19 +1163,15 @@ 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 (StructBase->isLValue()) {
LValue LV = EmitLValue(StructBase);
Address Addr = LV.getAddress();
Res = Addr.emitRawPointer(*this);
} else {
return nullptr;
}
Expand Down
62 changes: 62 additions & 0 deletions clang/test/CodeGen/attr-counted-by-pr110385.c
View file
Original file line number Diff line number Diff line change
@@ -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
View file
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(
Expand Down

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