head 1.1; branch 1.1.1; access; symbols netbsd-11-0-RC4:1.1.1.7 netbsd-11-0-RC3:1.1.1.7 netbsd-11-0-RC2:1.1.1.7 netbsd-11-0-RC1:1.1.1.7 perseant-exfatfs-base-20250801:1.1.1.7 netbsd-11:1.1.1.7.0.10 netbsd-11-base:1.1.1.7 netbsd-10-1-RELEASE:1.1.1.7 perseant-exfatfs-base-20240630:1.1.1.7 perseant-exfatfs:1.1.1.7.0.8 perseant-exfatfs-base:1.1.1.7 netbsd-8-3-RELEASE:1.1.1.5 netbsd-9-4-RELEASE:1.1.1.6 netbsd-10-0-RELEASE:1.1.1.7 netbsd-10-0-RC6:1.1.1.7 netbsd-10-0-RC5:1.1.1.7 netbsd-10-0-RC4:1.1.1.7 netbsd-10-0-RC3:1.1.1.7 netbsd-10-0-RC2:1.1.1.7 netbsd-10-0-RC1:1.1.1.7 netbsd-10:1.1.1.7.0.6 netbsd-10-base:1.1.1.7 netbsd-9-3-RELEASE:1.1.1.6 cjep_sun2x:1.1.1.7.0.4 cjep_sun2x-base:1.1.1.7 cjep_staticlib_x-base1:1.1.1.7 netbsd-9-2-RELEASE:1.1.1.6 cjep_staticlib_x:1.1.1.7.0.2 cjep_staticlib_x-base:1.1.1.7 netbsd-9-1-RELEASE:1.1.1.6 phil-wifi-20200421:1.1.1.7 phil-wifi-20200411:1.1.1.7 phil-wifi-20200406:1.1.1.7 netbsd-8-2-RELEASE:1.1.1.5 netbsd-9-0-RELEASE:1.1.1.6 netbsd-9-0-RC2:1.1.1.6 netbsd-9-0-RC1:1.1.1.6 netbsd-9:1.1.1.6.0.2 netbsd-9-base:1.1.1.6 phil-wifi-20190609:1.1.1.6 netbsd-8-1-RELEASE:1.1.1.5 netbsd-8-1-RC1:1.1.1.5 pgoyette-compat-merge-20190127:1.1.1.5.12.1 pgoyette-compat-20190127:1.1.1.6 pgoyette-compat-20190118:1.1.1.6 pgoyette-compat-1226:1.1.1.6 pgoyette-compat-1126:1.1.1.6 pgoyette-compat-1020:1.1.1.6 pgoyette-compat-0930:1.1.1.6 pgoyette-compat-0906:1.1.1.6 netbsd-7-2-RELEASE:1.1.1.3 pgoyette-compat-0728:1.1.1.6 clang-337282:1.1.1.6 netbsd-8-0-RELEASE:1.1.1.5 phil-wifi:1.1.1.5.0.14 phil-wifi-base:1.1.1.5 pgoyette-compat-0625:1.1.1.5 netbsd-8-0-RC2:1.1.1.5 pgoyette-compat-0521:1.1.1.5 pgoyette-compat-0502:1.1.1.5 pgoyette-compat-0422:1.1.1.5 netbsd-8-0-RC1:1.1.1.5 pgoyette-compat-0415:1.1.1.5 pgoyette-compat-0407:1.1.1.5 pgoyette-compat-0330:1.1.1.5 pgoyette-compat-0322:1.1.1.5 pgoyette-compat-0315:1.1.1.5 netbsd-7-1-2-RELEASE:1.1.1.3 pgoyette-compat:1.1.1.5.0.12 pgoyette-compat-base:1.1.1.5 netbsd-7-1-1-RELEASE:1.1.1.3 clang-319952:1.1.1.5 matt-nb8-mediatek:1.1.1.5.0.10 matt-nb8-mediatek-base:1.1.1.5 clang-309604:1.1.1.5 perseant-stdc-iso10646:1.1.1.5.0.8 perseant-stdc-iso10646-base:1.1.1.5 netbsd-8:1.1.1.5.0.6 netbsd-8-base:1.1.1.5 prg-localcount2-base3:1.1.1.5 prg-localcount2-base2:1.1.1.5 prg-localcount2-base1:1.1.1.5 prg-localcount2:1.1.1.5.0.4 prg-localcount2-base:1.1.1.5 pgoyette-localcount-20170426:1.1.1.5 bouyer-socketcan-base1:1.1.1.5 pgoyette-localcount-20170320:1.1.1.5 netbsd-7-1:1.1.1.3.0.10 netbsd-7-1-RELEASE:1.1.1.3 netbsd-7-1-RC2:1.1.1.3 clang-294123:1.1.1.5 netbsd-7-nhusb-base-20170116:1.1.1.3 bouyer-socketcan:1.1.1.5.0.2 bouyer-socketcan-base:1.1.1.5 clang-291444:1.1.1.5 pgoyette-localcount-20170107:1.1.1.4 netbsd-7-1-RC1:1.1.1.3 pgoyette-localcount-20161104:1.1.1.4 netbsd-7-0-2-RELEASE:1.1.1.3 localcount-20160914:1.1.1.4 netbsd-7-nhusb:1.1.1.3.0.8 netbsd-7-nhusb-base:1.1.1.3 clang-280599:1.1.1.4 pgoyette-localcount-20160806:1.1.1.4 pgoyette-localcount-20160726:1.1.1.4 pgoyette-localcount:1.1.1.4.0.2 pgoyette-localcount-base:1.1.1.4 netbsd-7-0-1-RELEASE:1.1.1.3 clang-261930:1.1.1.4 netbsd-7-0:1.1.1.3.0.6 netbsd-7-0-RELEASE:1.1.1.3 netbsd-7-0-RC3:1.1.1.3 netbsd-7-0-RC2:1.1.1.3 netbsd-7-0-RC1:1.1.1.3 clang-237755:1.1.1.3 clang-232565:1.1.1.3 clang-227398:1.1.1.3 tls-maxphys-base:1.1.1.3 tls-maxphys:1.1.1.3.0.4 netbsd-7:1.1.1.3.0.2 netbsd-7-base:1.1.1.3 clang-215315:1.1.1.3 clang-209886:1.1.1.3 yamt-pagecache:1.1.1.2.0.4 yamt-pagecache-base9:1.1.1.2 tls-earlyentropy:1.1.1.2.0.2 tls-earlyentropy-base:1.1.1.3 riastradh-xf86-video-intel-2-7-1-pre-2-21-15:1.1.1.2 riastradh-drm2-base3:1.1.1.2 clang-202566:1.1.1.2 clang-201163:1.1.1.1 clang-199312:1.1.1.1 clang-198450:1.1.1.1 clang-196603:1.1.1.1 clang-195771:1.1.1.1 LLVM:1.1.1; locks; strict; comment @// @; 1.1 date 2013.11.28.14.14.52; author joerg; state Exp; branches 1.1.1.1; next ; commitid ow8OybrawrB1f3fx; 1.1.1.1 date 2013.11.28.14.14.52; author joerg; state Exp; branches; next 1.1.1.2; commitid ow8OybrawrB1f3fx; 1.1.1.2 date 2014.03.04.19.55.01; author joerg; state Exp; branches 1.1.1.2.2.1 1.1.1.2.4.1; next 1.1.1.3; commitid 29z1hJonZISIXprx; 1.1.1.3 date 2014.05.30.18.14.44; author joerg; state Exp; branches 1.1.1.3.4.1; next 1.1.1.4; commitid 8q0kdlBlCn09GACx; 1.1.1.4 date 2016.02.27.22.12.07; author joerg; state Exp; branches 1.1.1.4.2.1; next 1.1.1.5; commitid tIimz3oDlh1NpBWy; 1.1.1.5 date 2017.01.11.10.35.42; author joerg; state Exp; branches 1.1.1.5.12.1 1.1.1.5.14.1; next 1.1.1.6; commitid CNnUNfII1jgNmxBz; 1.1.1.6 date 2018.07.17.18.31.07; author joerg; state Exp; branches; next 1.1.1.7; commitid wDzL46ALjrCZgwKA; 1.1.1.7 date 2019.11.13.22.19.28; author joerg; state dead; branches; next ; commitid QD8YATxuNG34YJKB; 1.1.1.2.2.1 date 2014.08.10.07.08.10; author tls; state Exp; branches; next ; commitid t01A1TLTYxkpGMLx; 1.1.1.2.4.1 date 2014.03.04.19.55.01; author yamt; state dead; branches; next 1.1.1.2.4.2; commitid WSrDtL5nYAUyiyBx; 1.1.1.2.4.2 date 2014.05.22.16.18.30; author yamt; state Exp; branches; next ; commitid WSrDtL5nYAUyiyBx; 1.1.1.3.4.1 date 2014.05.30.18.14.44; author tls; state dead; branches; next 1.1.1.3.4.2; commitid jTnpym9Qu0o4R1Nx; 1.1.1.3.4.2 date 2014.08.19.23.47.31; author tls; state Exp; branches; next ; commitid jTnpym9Qu0o4R1Nx; 1.1.1.4.2.1 date 2017.03.20.06.52.42; author pgoyette; state Exp; branches; next ; commitid jjw7cAwgyKq7RfKz; 1.1.1.5.12.1 date 2018.07.28.04.33.23; author pgoyette; state Exp; branches; next ; commitid 1UP1xAIUxv1ZgRLA; 1.1.1.5.14.1 date 2019.06.10.21.45.28; author christos; state Exp; branches; next 1.1.1.5.14.2; commitid jtc8rnCzWiEEHGqB; 1.1.1.5.14.2 date 2020.04.13.07.46.38; author martin; state dead; branches; next ; commitid X01YhRUPVUDaec4C; desc @@ 1.1 log @Initial revision @ text @//=== CastSizeChecker.cpp ---------------------------------------*- C++ -*-===// // // The LLVM Compiler Infrastructure // // This file is distributed under the University of Illinois Open Source // License. See LICENSE.TXT for details. // //===----------------------------------------------------------------------===// // // CastSizeChecker checks when casting a malloc'ed symbolic region to type T, // whether the size of the symbolic region is a multiple of the size of T. // //===----------------------------------------------------------------------===// #include "ClangSACheckers.h" #include "clang/AST/CharUnits.h" #include "clang/StaticAnalyzer/Core/BugReporter/BugType.h" #include "clang/StaticAnalyzer/Core/Checker.h" #include "clang/StaticAnalyzer/Core/CheckerManager.h" #include "clang/StaticAnalyzer/Core/PathSensitive/CheckerContext.h" using namespace clang; using namespace ento; namespace { class CastSizeChecker : public Checker< check::PreStmt > { mutable OwningPtr BT; public: void checkPreStmt(const CastExpr *CE, CheckerContext &C) const; }; } void CastSizeChecker::checkPreStmt(const CastExpr *CE,CheckerContext &C) const { const Expr *E = CE->getSubExpr(); ASTContext &Ctx = C.getASTContext(); QualType ToTy = Ctx.getCanonicalType(CE->getType()); const PointerType *ToPTy = dyn_cast(ToTy.getTypePtr()); if (!ToPTy) return; QualType ToPointeeTy = ToPTy->getPointeeType(); // Only perform the check if 'ToPointeeTy' is a complete type. if (ToPointeeTy->isIncompleteType()) return; ProgramStateRef state = C.getState(); const MemRegion *R = state->getSVal(E, C.getLocationContext()).getAsRegion(); if (R == 0) return; const SymbolicRegion *SR = dyn_cast(R); if (SR == 0) return; SValBuilder &svalBuilder = C.getSValBuilder(); SVal extent = SR->getExtent(svalBuilder); const llvm::APSInt *extentInt = svalBuilder.getKnownValue(state, extent); if (!extentInt) return; CharUnits regionSize = CharUnits::fromQuantity(extentInt->getSExtValue()); CharUnits typeSize = C.getASTContext().getTypeSizeInChars(ToPointeeTy); // Ignore void, and a few other un-sizeable types. if (typeSize.isZero()) return; if (regionSize % typeSize != 0) { if (ExplodedNode *errorNode = C.generateSink()) { if (!BT) BT.reset(new BuiltinBug("Cast region with wrong size.", "Cast a region whose size is not a multiple of the" " destination type size.")); BugReport *R = new BugReport(*BT, BT->getDescription(), errorNode); R->addRange(CE->getSourceRange()); C.emitReport(R); } } } void ento::registerCastSizeChecker(CheckerManager &mgr) { mgr.registerChecker(); } @ 1.1.1.1 log @Import Clang 3.4rc1 r195771. @ text @@ 1.1.1.2 log @Import Clang 3.5svn r202566. @ text @a31 58 /// Check if we are casting to a struct with a flexible array at the end. /// \code /// struct foo { /// size_t len; /// struct bar data[]; /// }; /// \endcode /// or /// \code /// struct foo { /// size_t len; /// struct bar data[0]; /// } /// \endcode /// In these cases it is also valid to allocate size of struct foo + a multiple /// of struct bar. static bool evenFlexibleArraySize(ASTContext &Ctx, CharUnits RegionSize, CharUnits TypeSize, QualType ToPointeeTy) { const RecordType *RT = ToPointeeTy->getAs(); if (!RT) return false; const RecordDecl *RD = RT->getDecl(); RecordDecl::field_iterator Iter(RD->field_begin()); RecordDecl::field_iterator End(RD->field_end()); const FieldDecl *Last = 0; for (; Iter != End; ++Iter) Last = *Iter; assert(Last && "empty structs should already be handled"); const Type *ElemType = Last->getType()->getArrayElementTypeNoTypeQual(); CharUnits FlexSize; if (const ConstantArrayType *ArrayTy = Ctx.getAsConstantArrayType(Last->getType())) { FlexSize = Ctx.getTypeSizeInChars(ElemType); if (ArrayTy->getSize() == 1 && TypeSize > FlexSize) TypeSize -= FlexSize; else if (ArrayTy->getSize() != 0) return false; } else if (RD->hasFlexibleArrayMember()) { FlexSize = Ctx.getTypeSizeInChars(ElemType); } else { return false; } if (FlexSize.isZero()) return false; CharUnits Left = RegionSize - TypeSize; if (Left.isNegative()) return false; if (Left % FlexSize == 0) return true; return false; } d69 11 a79 14 if (regionSize % typeSize == 0) return; if (evenFlexibleArraySize(Ctx, regionSize, typeSize, ToPointeeTy)) return; if (ExplodedNode *errorNode = C.generateSink()) { if (!BT) BT.reset(new BuiltinBug(this, "Cast region with wrong size.", "Cast a region whose size is not a multiple" " of the destination type size.")); BugReport *R = new BugReport(*BT, BT->getDescription(), errorNode); R->addRange(CE->getSourceRange()); C.emitReport(R); d83 1 d85 1 a85 1 mgr.registerChecker(); @ 1.1.1.2.2.1 log @Rebase. @ text @d26 1 a26 2 mutable std::unique_ptr BT; d57 1 a57 1 const FieldDecl *Last = nullptr; d107 1 a107 1 if (!R) d111 1 a111 1 if (!SR) @ 1.1.1.3 log @Import Clang 3.5svn r209886. @ text @d26 1 a26 2 mutable std::unique_ptr BT; d57 1 a57 1 const FieldDecl *Last = nullptr; d107 1 a107 1 if (!R) d111 1 a111 1 if (!SR) @ 1.1.1.4 log @Import Clang 3.8.0rc3 r261930. @ text @d85 4 a88 1 return Left % FlexSize == 0; d134 1 a134 1 if (ExplodedNode *errorNode = C.generateErrorNode()) { d139 1 a139 1 auto R = llvm::make_unique(*BT, BT->getDescription(), errorNode); d141 1 a141 1 C.emitReport(std::move(R)); @ 1.1.1.4.2.1 log @Sync with HEAD @ text @d143 1 a143 6 // PR31226: C++ is more complicated than what this checker currently supports. // There are derived-to-base casts, there are different rules for 0-size // structures, no flexible arrays, etc. // FIXME: Disabled on C++ for now. if (!mgr.getLangOpts().CPlusPlus) mgr.registerChecker(); @ 1.1.1.5 log @Import Clang pre-4.0.0 r291444. @ text @d143 1 a143 6 // PR31226: C++ is more complicated than what this checker currently supports. // There are derived-to-base casts, there are different rules for 0-size // structures, no flexible arrays, etc. // FIXME: Disabled on C++ for now. if (!mgr.getLangOpts().CPlusPlus) mgr.registerChecker(); @ 1.1.1.5.14.1 log @Sync with HEAD @ text @d104 1 a104 1 const MemRegion *R = C.getSVal(E).getAsRegion(); @ 1.1.1.5.14.2 log @Mostly merge changes from HEAD upto 20200411 @ text @@ 1.1.1.5.12.1 log @Sync with HEAD @ text @d104 1 a104 1 const MemRegion *R = C.getSVal(E).getAsRegion(); @ 1.1.1.6 log @Import clang r337282 from trunk @ text @d104 1 a104 1 const MemRegion *R = C.getSVal(E).getAsRegion(); @ 1.1.1.7 log @Mark old LLVM instance as dead. @ text @@ 1.1.1.3.4.1 log @file CastSizeChecker.cpp was added on branch tls-maxphys on 2014-08-19 23:47:31 +0000 @ text @d1 147 @ 1.1.1.3.4.2 log @Rebase to HEAD as of a few days ago. @ text @a0 147 //=== CastSizeChecker.cpp ---------------------------------------*- C++ -*-===// // // The LLVM Compiler Infrastructure // // This file is distributed under the University of Illinois Open Source // License. See LICENSE.TXT for details. // //===----------------------------------------------------------------------===// // // CastSizeChecker checks when casting a malloc'ed symbolic region to type T, // whether the size of the symbolic region is a multiple of the size of T. // //===----------------------------------------------------------------------===// #include "ClangSACheckers.h" #include "clang/AST/CharUnits.h" #include "clang/StaticAnalyzer/Core/BugReporter/BugType.h" #include "clang/StaticAnalyzer/Core/Checker.h" #include "clang/StaticAnalyzer/Core/CheckerManager.h" #include "clang/StaticAnalyzer/Core/PathSensitive/CheckerContext.h" using namespace clang; using namespace ento; namespace { class CastSizeChecker : public Checker< check::PreStmt > { mutable std::unique_ptr BT; public: void checkPreStmt(const CastExpr *CE, CheckerContext &C) const; }; } /// Check if we are casting to a struct with a flexible array at the end. /// \code /// struct foo { /// size_t len; /// struct bar data[]; /// }; /// \endcode /// or /// \code /// struct foo { /// size_t len; /// struct bar data[0]; /// } /// \endcode /// In these cases it is also valid to allocate size of struct foo + a multiple /// of struct bar. static bool evenFlexibleArraySize(ASTContext &Ctx, CharUnits RegionSize, CharUnits TypeSize, QualType ToPointeeTy) { const RecordType *RT = ToPointeeTy->getAs(); if (!RT) return false; const RecordDecl *RD = RT->getDecl(); RecordDecl::field_iterator Iter(RD->field_begin()); RecordDecl::field_iterator End(RD->field_end()); const FieldDecl *Last = nullptr; for (; Iter != End; ++Iter) Last = *Iter; assert(Last && "empty structs should already be handled"); const Type *ElemType = Last->getType()->getArrayElementTypeNoTypeQual(); CharUnits FlexSize; if (const ConstantArrayType *ArrayTy = Ctx.getAsConstantArrayType(Last->getType())) { FlexSize = Ctx.getTypeSizeInChars(ElemType); if (ArrayTy->getSize() == 1 && TypeSize > FlexSize) TypeSize -= FlexSize; else if (ArrayTy->getSize() != 0) return false; } else if (RD->hasFlexibleArrayMember()) { FlexSize = Ctx.getTypeSizeInChars(ElemType); } else { return false; } if (FlexSize.isZero()) return false; CharUnits Left = RegionSize - TypeSize; if (Left.isNegative()) return false; if (Left % FlexSize == 0) return true; return false; } void CastSizeChecker::checkPreStmt(const CastExpr *CE,CheckerContext &C) const { const Expr *E = CE->getSubExpr(); ASTContext &Ctx = C.getASTContext(); QualType ToTy = Ctx.getCanonicalType(CE->getType()); const PointerType *ToPTy = dyn_cast(ToTy.getTypePtr()); if (!ToPTy) return; QualType ToPointeeTy = ToPTy->getPointeeType(); // Only perform the check if 'ToPointeeTy' is a complete type. if (ToPointeeTy->isIncompleteType()) return; ProgramStateRef state = C.getState(); const MemRegion *R = state->getSVal(E, C.getLocationContext()).getAsRegion(); if (!R) return; const SymbolicRegion *SR = dyn_cast(R); if (!SR) return; SValBuilder &svalBuilder = C.getSValBuilder(); SVal extent = SR->getExtent(svalBuilder); const llvm::APSInt *extentInt = svalBuilder.getKnownValue(state, extent); if (!extentInt) return; CharUnits regionSize = CharUnits::fromQuantity(extentInt->getSExtValue()); CharUnits typeSize = C.getASTContext().getTypeSizeInChars(ToPointeeTy); // Ignore void, and a few other un-sizeable types. if (typeSize.isZero()) return; if (regionSize % typeSize == 0) return; if (evenFlexibleArraySize(Ctx, regionSize, typeSize, ToPointeeTy)) return; if (ExplodedNode *errorNode = C.generateSink()) { if (!BT) BT.reset(new BuiltinBug(this, "Cast region with wrong size.", "Cast a region whose size is not a multiple" " of the destination type size.")); BugReport *R = new BugReport(*BT, BT->getDescription(), errorNode); R->addRange(CE->getSourceRange()); C.emitReport(R); } } void ento::registerCastSizeChecker(CheckerManager &mgr) { mgr.registerChecker(); } @ 1.1.1.2.4.1 log @file CastSizeChecker.cpp was added on branch yamt-pagecache on 2014-05-22 16:18:30 +0000 @ text @d1 146 @ 1.1.1.2.4.2 log @sync with head. for a reference, the tree before this commit was tagged as yamt-pagecache-tag8. this commit was splitted into small chunks to avoid a limitation of cvs. ("Protocol error: too many arguments") @ text @a0 146 //=== CastSizeChecker.cpp ---------------------------------------*- C++ -*-===// // // The LLVM Compiler Infrastructure // // This file is distributed under the University of Illinois Open Source // License. See LICENSE.TXT for details. // //===----------------------------------------------------------------------===// // // CastSizeChecker checks when casting a malloc'ed symbolic region to type T, // whether the size of the symbolic region is a multiple of the size of T. // //===----------------------------------------------------------------------===// #include "ClangSACheckers.h" #include "clang/AST/CharUnits.h" #include "clang/StaticAnalyzer/Core/BugReporter/BugType.h" #include "clang/StaticAnalyzer/Core/Checker.h" #include "clang/StaticAnalyzer/Core/CheckerManager.h" #include "clang/StaticAnalyzer/Core/PathSensitive/CheckerContext.h" using namespace clang; using namespace ento; namespace { class CastSizeChecker : public Checker< check::PreStmt > { mutable OwningPtr BT; public: void checkPreStmt(const CastExpr *CE, CheckerContext &C) const; }; } /// Check if we are casting to a struct with a flexible array at the end. /// \code /// struct foo { /// size_t len; /// struct bar data[]; /// }; /// \endcode /// or /// \code /// struct foo { /// size_t len; /// struct bar data[0]; /// } /// \endcode /// In these cases it is also valid to allocate size of struct foo + a multiple /// of struct bar. static bool evenFlexibleArraySize(ASTContext &Ctx, CharUnits RegionSize, CharUnits TypeSize, QualType ToPointeeTy) { const RecordType *RT = ToPointeeTy->getAs(); if (!RT) return false; const RecordDecl *RD = RT->getDecl(); RecordDecl::field_iterator Iter(RD->field_begin()); RecordDecl::field_iterator End(RD->field_end()); const FieldDecl *Last = 0; for (; Iter != End; ++Iter) Last = *Iter; assert(Last && "empty structs should already be handled"); const Type *ElemType = Last->getType()->getArrayElementTypeNoTypeQual(); CharUnits FlexSize; if (const ConstantArrayType *ArrayTy = Ctx.getAsConstantArrayType(Last->getType())) { FlexSize = Ctx.getTypeSizeInChars(ElemType); if (ArrayTy->getSize() == 1 && TypeSize > FlexSize) TypeSize -= FlexSize; else if (ArrayTy->getSize() != 0) return false; } else if (RD->hasFlexibleArrayMember()) { FlexSize = Ctx.getTypeSizeInChars(ElemType); } else { return false; } if (FlexSize.isZero()) return false; CharUnits Left = RegionSize - TypeSize; if (Left.isNegative()) return false; if (Left % FlexSize == 0) return true; return false; } void CastSizeChecker::checkPreStmt(const CastExpr *CE,CheckerContext &C) const { const Expr *E = CE->getSubExpr(); ASTContext &Ctx = C.getASTContext(); QualType ToTy = Ctx.getCanonicalType(CE->getType()); const PointerType *ToPTy = dyn_cast(ToTy.getTypePtr()); if (!ToPTy) return; QualType ToPointeeTy = ToPTy->getPointeeType(); // Only perform the check if 'ToPointeeTy' is a complete type. if (ToPointeeTy->isIncompleteType()) return; ProgramStateRef state = C.getState(); const MemRegion *R = state->getSVal(E, C.getLocationContext()).getAsRegion(); if (R == 0) return; const SymbolicRegion *SR = dyn_cast(R); if (SR == 0) return; SValBuilder &svalBuilder = C.getSValBuilder(); SVal extent = SR->getExtent(svalBuilder); const llvm::APSInt *extentInt = svalBuilder.getKnownValue(state, extent); if (!extentInt) return; CharUnits regionSize = CharUnits::fromQuantity(extentInt->getSExtValue()); CharUnits typeSize = C.getASTContext().getTypeSizeInChars(ToPointeeTy); // Ignore void, and a few other un-sizeable types. if (typeSize.isZero()) return; if (regionSize % typeSize == 0) return; if (evenFlexibleArraySize(Ctx, regionSize, typeSize, ToPointeeTy)) return; if (ExplodedNode *errorNode = C.generateSink()) { if (!BT) BT.reset(new BuiltinBug(this, "Cast region with wrong size.", "Cast a region whose size is not a multiple" " of the destination type size.")); BugReport *R = new BugReport(*BT, BT->getDescription(), errorNode); R->addRange(CE->getSourceRange()); C.emitReport(R); } } void ento::registerCastSizeChecker(CheckerManager &mgr) { mgr.registerChecker(); } @