boga95 updated this revision to Diff 179436.
boga95 marked 7 inline comments as done.
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D55734/new/
https://reviews.llvm.org/D55734
Files:
lib/StaticAnalyzer/Checkers/GenericTaintChecker.cpp
Index: lib/StaticAnalyzer/Checkers/GenericTaintChecker.cpp
===================================================================
--- lib/StaticAnalyzer/Checkers/GenericTaintChecker.cpp
+++ lib/StaticAnalyzer/Checkers/GenericTaintChecker.cpp
@@ -23,15 +23,20 @@
#include "clang/StaticAnalyzer/Core/PathSensitive/CheckerContext.h"
#include "clang/StaticAnalyzer/Core/PathSensitive/ProgramStateTrait.h"
#include <climits>
+#include <initializer_list>
+#include <utility>
using namespace clang;
using namespace ento;
namespace {
-class GenericTaintChecker : public Checker< check::PostStmt<CallExpr>,
- check::PreStmt<CallExpr> > {
+class GenericTaintChecker
+ : public Checker<check::PostStmt<CallExpr>, check::PreStmt<CallExpr>> {
public:
- static void *getTag() { static int Tag; return &Tag; }
+ static void *getTag() {
+ static int Tag;
+ return &Tag;
+ }
void checkPostStmt(const CallExpr *CE, CheckerContext &C) const;
@@ -43,7 +48,7 @@
static const unsigned ReturnValueIndex = UINT_MAX - 1;
mutable std::unique_ptr<BugType> BT;
- inline void initBugType() const {
+ void initBugType() const {
if (!BT)
BT.reset(new BugType(this, "Use of Untrusted Data", "Untrusted Data"));
}
@@ -69,8 +74,8 @@
static Optional<SVal> getPointedToSVal(CheckerContext &C, const Expr *Arg);
/// Functions defining the attack surface.
- typedef ProgramStateRef (GenericTaintChecker::*FnCheck)(const CallExpr *,
- CheckerContext &C) const;
+ using FnCheck = ProgramStateRef (GenericTaintChecker::*)(
+ const CallExpr *, CheckerContext &C) const;
ProgramStateRef postScanf(const CallExpr *CE, CheckerContext &C) const;
ProgramStateRef postSocket(const CallExpr *CE, CheckerContext &C) const;
ProgramStateRef postRetTaint(const CallExpr *CE, CheckerContext &C) const;
@@ -100,7 +105,7 @@
bool generateReportIfTainted(const Expr *E, const char Msg[],
CheckerContext &C) const;
- typedef SmallVector<unsigned, 2> ArgVector;
+ using ArgVector = SmallVector<unsigned, 2>;
/// A struct used to specify taint propagation rules for a function.
///
@@ -112,50 +117,47 @@
/// ReturnValueIndex is added to the dst list, the return value will be
/// tainted.
struct TaintPropagationRule {
+ enum class VariadicType { None, Src, Dst };
+
/// List of arguments which can be taint sources and should be checked.
ArgVector SrcArgs;
/// List of arguments which should be tainted on function return.
ArgVector DstArgs;
- // TODO: Check if using other data structures would be more optimal.
-
- TaintPropagationRule() {}
-
- TaintPropagationRule(unsigned SArg,
- unsigned DArg, bool TaintRet = false) {
- SrcArgs.push_back(SArg);
- DstArgs.push_back(DArg);
- if (TaintRet)
- DstArgs.push_back(ReturnValueIndex);
- }
-
- TaintPropagationRule(unsigned SArg1, unsigned SArg2,
- unsigned DArg, bool TaintRet = false) {
- SrcArgs.push_back(SArg1);
- SrcArgs.push_back(SArg2);
- DstArgs.push_back(DArg);
- if (TaintRet)
- DstArgs.push_back(ReturnValueIndex);
- }
+ /// Index for the first variadic parameter if exist.
+ unsigned VariadicIndex;
+ /// Show when a function has variadic parameters. If it has, it marks all
+ /// of them as source or destination.
+ VariadicType VarType;
+
+ TaintPropagationRule()
+ : VariadicIndex(InvalidArgIndex), VarType(VariadicType::None) {}
+
+ TaintPropagationRule(std::initializer_list<unsigned> &&Src,
+ std::initializer_list<unsigned> &&Dst,
+ VariadicType Var = VariadicType::None,
+ unsigned VarIndex = InvalidArgIndex)
+ : SrcArgs(std::move(Src)), DstArgs(std::move(Dst)),
+ VariadicIndex(VarIndex), VarType(Var) {}
/// Get the propagation rule for a given function.
static TaintPropagationRule
- getTaintPropagationRule(const FunctionDecl *FDecl,
- StringRef Name,
- CheckerContext &C);
+ getTaintPropagationRule(const FunctionDecl *FDecl, StringRef Name,
+ CheckerContext &C);
- inline void addSrcArg(unsigned A) { SrcArgs.push_back(A); }
- inline void addDstArg(unsigned A) { DstArgs.push_back(A); }
+ void addSrcArg(unsigned A) { SrcArgs.push_back(A); }
+ void addDstArg(unsigned A) { DstArgs.push_back(A); }
- inline bool isNull() const { return SrcArgs.empty(); }
+ bool isNull() const {
+ return SrcArgs.empty() && DstArgs.empty() &&
+ VariadicType::None == VarType;
+ }
- inline bool isDestinationArgument(unsigned ArgNum) const {
- return (std::find(DstArgs.begin(),
- DstArgs.end(), ArgNum) != DstArgs.end());
+ bool isDestinationArgument(unsigned ArgNum) const {
+ return (llvm::find(DstArgs, ArgNum) != DstArgs.end());
}
- static inline bool isTaintedOrPointsToTainted(const Expr *E,
- ProgramStateRef State,
- CheckerContext &C) {
+ static bool isTaintedOrPointsToTainted(const Expr *E, ProgramStateRef State,
+ CheckerContext &C) {
if (State->isTainted(E, C.getLocationContext()) || isStdin(E, C))
return true;
@@ -169,7 +171,6 @@
/// Pre-process a function which propagates taint according to the
/// taint rule.
ProgramStateRef process(const CallExpr *CE, CheckerContext &C) const;
-
};
};
@@ -177,17 +178,17 @@
const unsigned GenericTaintChecker::InvalidArgIndex;
const char GenericTaintChecker::MsgUncontrolledFormatString[] =
- "Untrusted data is used as a format string "
- "(CWE-134: Uncontrolled Format String)";
+ "Untrusted data is used as a format string "
+ "(CWE-134: Uncontrolled Format String)";
const char GenericTaintChecker::MsgSanitizeSystemArgs[] =
- "Untrusted data is passed to a system call "
- "(CERT/STR02-C. Sanitize data passed to complex subsystems)";
+ "Untrusted data is passed to a system call "
+ "(CERT/STR02-C. Sanitize data passed to complex subsystems)";
const char GenericTaintChecker::MsgTaintedBufferSize[] =
- "Untrusted data is used to specify the buffer size "
- "(CERT/STR31-C. Guarantee that storage for strings has sufficient space for "
- "character data and the null terminator)";
+ "Untrusted data is used to specify the buffer size "
+ "(CERT/STR31-C. Guarantee that storage for strings has sufficient space "
+ "for character data and the null terminator)";
} // end of anonymous namespace
@@ -199,33 +200,33 @@
GenericTaintChecker::TaintPropagationRule
GenericTaintChecker::TaintPropagationRule::getTaintPropagationRule(
- const FunctionDecl *FDecl,
- StringRef Name,
- CheckerContext &C) {
+ const FunctionDecl *FDecl, StringRef Name, CheckerContext &C) {
// TODO: Currently, we might lose precision here: we always mark a return
// value as tainted even if it's just a pointer, pointing to tainted data.
// Check for exact name match for functions without builtin substitutes.
- TaintPropagationRule Rule = llvm::StringSwitch<TaintPropagationRule>(Name)
- .Case("atoi", TaintPropagationRule(0, ReturnValueIndex))
- .Case("atol", TaintPropagationRule(0, ReturnValueIndex))
- .Case("atoll", TaintPropagationRule(0, ReturnValueIndex))
- .Case("getc", TaintPropagationRule(0, ReturnValueIndex))
- .Case("fgetc", TaintPropagationRule(0, ReturnValueIndex))
- .Case("getc_unlocked", TaintPropagationRule(0, ReturnValueIndex))
- .Case("getw", TaintPropagationRule(0, ReturnValueIndex))
- .Case("toupper", TaintPropagationRule(0, ReturnValueIndex))
- .Case("tolower", TaintPropagationRule(0, ReturnValueIndex))
- .Case("strchr", TaintPropagationRule(0, ReturnValueIndex))
- .Case("strrchr", TaintPropagationRule(0, ReturnValueIndex))
- .Case("read", TaintPropagationRule(0, 2, 1, true))
- .Case("pread", TaintPropagationRule(InvalidArgIndex, 1, true))
- .Case("gets", TaintPropagationRule(InvalidArgIndex, 0, true))
- .Case("fgets", TaintPropagationRule(2, 0, true))
- .Case("getline", TaintPropagationRule(2, 0))
- .Case("getdelim", TaintPropagationRule(3, 0))
- .Case("fgetln", TaintPropagationRule(0, ReturnValueIndex))
- .Default(TaintPropagationRule());
+ TaintPropagationRule Rule =
+ llvm::StringSwitch<TaintPropagationRule>(Name)
+ .Case("atoi", TaintPropagationRule({0}, {ReturnValueIndex}))
+ .Case("atol", TaintPropagationRule({0}, {ReturnValueIndex}))
+ .Case("atoll", TaintPropagationRule({0}, {ReturnValueIndex}))
+ .Case("getc", TaintPropagationRule({0}, {ReturnValueIndex}))
+ .Case("fgetc", TaintPropagationRule({0}, {ReturnValueIndex}))
+ .Case("getc_unlocked", TaintPropagationRule({0}, {ReturnValueIndex}))
+ .Case("getw", TaintPropagationRule({0}, {ReturnValueIndex}))
+ .Case("toupper", TaintPropagationRule({0}, {ReturnValueIndex}))
+ .Case("tolower", TaintPropagationRule({0}, {ReturnValueIndex}))
+ .Case("strchr", TaintPropagationRule({0}, {ReturnValueIndex}))
+ .Case("strrchr", TaintPropagationRule({0}, {ReturnValueIndex}))
+ .Case("read", TaintPropagationRule({0, 2}, {1, ReturnValueIndex}))
+ .Case("pread",
+ TaintPropagationRule({0, 1, 2, 3}, {1, ReturnValueIndex}))
+ .Case("gets", TaintPropagationRule({}, {0, ReturnValueIndex}))
+ .Case("fgets", TaintPropagationRule({2}, {0, ReturnValueIndex}))
+ .Case("getline", TaintPropagationRule({2}, {0}))
+ .Case("getdelim", TaintPropagationRule({3}, {0}))
+ .Case("fgetln", TaintPropagationRule({0}, {ReturnValueIndex}))
+ .Default(TaintPropagationRule());
if (!Rule.isNull())
return Rule;
@@ -233,18 +234,18 @@
// Check if it's one of the memory setting/copying functions.
// This check is specialized but faster then calling isCLibraryFunction.
unsigned BId = 0;
- if ( (BId = FDecl->getMemoryFunctionKind()) )
- switch(BId) {
+ if ((BId = FDecl->getMemoryFunctionKind()))
+ switch (BId) {
case Builtin::BImemcpy:
case Builtin::BImemmove:
case Builtin::BIstrncpy:
case Builtin::BIstrncat:
- return TaintPropagationRule(1, 2, 0, true);
+ return TaintPropagationRule({1, 2}, {0, ReturnValueIndex});
case Builtin::BIstrlcpy:
case Builtin::BIstrlcat:
- return TaintPropagationRule(1, 2, 0, false);
+ return TaintPropagationRule({1, 2}, {0});
case Builtin::BIstrndup:
- return TaintPropagationRule(0, 1, ReturnValueIndex);
+ return TaintPropagationRule({0, 1}, {ReturnValueIndex});
default:
break;
@@ -252,20 +253,23 @@
// Process all other functions which could be defined as builtins.
if (Rule.isNull()) {
- if (C.isCLibraryFunction(FDecl, "snprintf") ||
- C.isCLibraryFunction(FDecl, "sprintf"))
- return TaintPropagationRule(InvalidArgIndex, 0, true);
+ if (C.isCLibraryFunction(FDecl, "snprintf"))
+ return TaintPropagationRule({1}, {0, ReturnValueIndex}, VariadicType::Src,
+ 3);
+ else if (C.isCLibraryFunction(FDecl, "sprintf"))
+ return TaintPropagationRule({}, {0, ReturnValueIndex}, VariadicType::Src,
+ 2);
else if (C.isCLibraryFunction(FDecl, "strcpy") ||
C.isCLibraryFunction(FDecl, "stpcpy") ||
C.isCLibraryFunction(FDecl, "strcat"))
- return TaintPropagationRule(1, 0, true);
+ return TaintPropagationRule({1}, {0, ReturnValueIndex});
else if (C.isCLibraryFunction(FDecl, "bcopy"))
- return TaintPropagationRule(0, 2, 1, false);
+ return TaintPropagationRule({0, 2}, {1});
else if (C.isCLibraryFunction(FDecl, "strdup") ||
C.isCLibraryFunction(FDecl, "strdupa"))
- return TaintPropagationRule(0, ReturnValueIndex);
+ return TaintPropagationRule({0}, {ReturnValueIndex});
else if (C.isCLibraryFunction(FDecl, "wcsdup"))
- return TaintPropagationRule(0, ReturnValueIndex);
+ return TaintPropagationRule({0}, {ReturnValueIndex});
}
// Skipping the following functions, since they might be used for cleansing
@@ -305,7 +309,7 @@
// First, try generating a propagation rule for this function.
TaintPropagationRule Rule =
- TaintPropagationRule::getTaintPropagationRule(FDecl, Name, C);
+ TaintPropagationRule::getTaintPropagationRule(FDecl, Name, C);
if (!Rule.isNull()) {
State = Rule.process(CE, C);
if (!State)
@@ -316,15 +320,14 @@
// Otherwise, check if we have custom pre-processing implemented.
FnCheck evalFunction = llvm::StringSwitch<FnCheck>(Name)
- .Case("fscanf", &GenericTaintChecker::preFscanf)
- .Default(nullptr);
+ .Case("fscanf", &GenericTaintChecker::preFscanf)
+ .Default(nullptr);
// Check and evaluate the call.
if (evalFunction)
State = (this->*evalFunction)(CE, C);
if (!State)
return;
C.addTransition(State);
-
}
bool GenericTaintChecker::propagateFromPre(const CallExpr *CE,
@@ -338,10 +341,7 @@
if (TaintArgs.isEmpty())
return false;
- for (llvm::ImmutableSet<unsigned>::iterator
- I = TaintArgs.begin(), E = TaintArgs.end(); I != E; ++I) {
- unsigned ArgNum = *I;
-
+ for (unsigned ArgNum : TaintArgs) {
// Special handling for the tainted return value.
if (ArgNum == ReturnValueIndex) {
State = State->addTaint(CE, C.getLocationContext());
@@ -352,7 +352,7 @@
// tainted after the call.
if (CE->getNumArgs() < (ArgNum + 1))
return false;
- const Expr* Arg = CE->getArg(ArgNum);
+ const Expr *Arg = CE->getArg(ArgNum);
Optional<SVal> V = getPointedToSVal(C, Arg);
if (V)
State = State->addTaint(*V);
@@ -379,19 +379,20 @@
StringRef Name = C.getCalleeName(FDecl);
if (Name.empty())
return;
- FnCheck evalFunction = llvm::StringSwitch<FnCheck>(Name)
- .Case("scanf", &GenericTaintChecker::postScanf)
- // TODO: Add support for vfscanf & family.
- .Case("getchar", &GenericTaintChecker::postRetTaint)
- .Case("getchar_unlocked", &GenericTaintChecker::postRetTaint)
- .Case("getenv", &GenericTaintChecker::postRetTaint)
- .Case("fopen", &GenericTaintChecker::postRetTaint)
- .Case("fdopen", &GenericTaintChecker::postRetTaint)
- .Case("freopen", &GenericTaintChecker::postRetTaint)
- .Case("getch", &GenericTaintChecker::postRetTaint)
- .Case("wgetch", &GenericTaintChecker::postRetTaint)
- .Case("socket", &GenericTaintChecker::postSocket)
- .Default(nullptr);
+ FnCheck evalFunction =
+ llvm::StringSwitch<FnCheck>(Name)
+ .Case("scanf", &GenericTaintChecker::postScanf)
+ // TODO: Add support for vfscanf & family.
+ .Case("getchar", &GenericTaintChecker::postRetTaint)
+ .Case("getchar_unlocked", &GenericTaintChecker::postRetTaint)
+ .Case("getenv", &GenericTaintChecker::postRetTaint)
+ .Case("fopen", &GenericTaintChecker::postRetTaint)
+ .Case("fdopen", &GenericTaintChecker::postRetTaint)
+ .Case("freopen", &GenericTaintChecker::postRetTaint)
+ .Case("getch", &GenericTaintChecker::postRetTaint)
+ .Case("wgetch", &GenericTaintChecker::postRetTaint)
+ .Case("socket", &GenericTaintChecker::postSocket)
+ .Default(nullptr);
// If the callee isn't defined, it is not of security concern.
// Check and evaluate the call.
@@ -404,7 +405,8 @@
C.addTransition(State);
}
-bool GenericTaintChecker::checkPre(const CallExpr *CE, CheckerContext &C) const{
+bool GenericTaintChecker::checkPre(const CallExpr *CE,
+ CheckerContext &C) const {
if (checkUncontrolledFormatString(CE, C))
return true;
@@ -458,53 +460,27 @@
// Check for taint in arguments.
bool IsTainted = false;
- for (ArgVector::const_iterator I = SrcArgs.begin(),
- E = SrcArgs.end(); I != E; ++I) {
- unsigned ArgNum = *I;
-
- if (ArgNum == InvalidArgIndex) {
- // Check if any of the arguments is tainted, but skip the
- // destination arguments.
- for (unsigned int i = 0; i < CE->getNumArgs(); ++i) {
- if (isDestinationArgument(i))
- continue;
- if ((IsTainted = isTaintedOrPointsToTainted(CE->getArg(i), State, C)))
- break;
- }
- break;
- }
-
- if (CE->getNumArgs() < (ArgNum + 1))
+ for (unsigned ArgNum : SrcArgs) {
+ if (ArgNum >= CE->getNumArgs())
return State;
if ((IsTainted = isTaintedOrPointsToTainted(CE->getArg(ArgNum), State, C)))
break;
}
+
+ // Check for taint in variadic arguments.
+ if (!IsTainted && VariadicType::Src == VarType) {
+ // Check if any of the arguments is tainted
+ for (unsigned int i = VariadicIndex; i < CE->getNumArgs(); ++i) {
+ if ((IsTainted = isTaintedOrPointsToTainted(CE->getArg(i), State, C)))
+ break;
+ }
+ }
+
if (!IsTainted)
return State;
// Mark the arguments which should be tainted after the function returns.
- for (ArgVector::const_iterator I = DstArgs.begin(),
- E = DstArgs.end(); I != E; ++I) {
- unsigned ArgNum = *I;
-
- // Should we mark all arguments as tainted?
- if (ArgNum == InvalidArgIndex) {
- // For all pointer and references that were passed in:
- // If they are not pointing to const data, mark data as tainted.
- // TODO: So far we are just going one level down; ideally we'd need to
- // recurse here.
- for (unsigned int i = 0; i < CE->getNumArgs(); ++i) {
- const Expr *Arg = CE->getArg(i);
- // Process pointer argument.
- const Type *ArgTy = Arg->getType().getTypePtr();
- QualType PType = ArgTy->getPointeeType();
- if ((!PType.isNull() && !PType.isConstQualified())
- || (ArgTy->isReferenceType() && !Arg->getType().isConstQualified()))
- State = State->add<TaintArgsOnPostVisit>(i);
- }
- continue;
- }
-
+ for (unsigned ArgNum : DstArgs) {
// Should mark the return value?
if (ArgNum == ReturnValueIndex) {
State = State->add<TaintArgsOnPostVisit>(ReturnValueIndex);
@@ -516,14 +492,30 @@
State = State->add<TaintArgsOnPostVisit>(ArgNum);
}
+ // Mark all variadic arguments tainted if present.
+ if (VariadicType::Dst == VarType) {
+ // For all pointer and references that were passed in:
+ // If they are not pointing to const data, mark data as tainted.
+ // TODO: So far we are just going one level down; ideally we'd need to
+ // recurse here.
+ for (unsigned int i = VariadicIndex; i < CE->getNumArgs(); ++i) {
+ const Expr *Arg = CE->getArg(i);
+ // Process pointer argument.
+ const Type *ArgTy = Arg->getType().getTypePtr();
+ QualType PType = ArgTy->getPointeeType();
+ if ((!PType.isNull() && !PType.isConstQualified()) ||
+ (ArgTy->isReferenceType() && !Arg->getType().isConstQualified()))
+ State = State->add<TaintArgsOnPostVisit>(i);
+ }
+ }
+
return State;
}
-
// If argument 0 (file descriptor) is tainted, all arguments except for arg 0
// and arg 1 should get taint.
ProgramStateRef GenericTaintChecker::preFscanf(const CallExpr *CE,
- CheckerContext &C) const {
+ CheckerContext &C) const {
assert(CE->getNumArgs() >= 2);
ProgramStateRef State = C.getState();
@@ -532,14 +524,13 @@
isStdin(CE->getArg(0), C)) {
// All arguments except for the first two should get taint.
for (unsigned int i = 2; i < CE->getNumArgs(); ++i)
- State = State->add<TaintArgsOnPostVisit>(i);
+ State = State->add<TaintArgsOnPostVisit>(i);
return State;
}
return nullptr;
}
-
// If argument 0(protocol domain) is network, the return value should get taint.
ProgramStateRef GenericTaintChecker::postSocket(const CallExpr *CE,
CheckerContext &C) const {
@@ -558,7 +549,7 @@
}
ProgramStateRef GenericTaintChecker::postScanf(const CallExpr *CE,
- CheckerContext &C) const {
+ CheckerContext &C) const {
ProgramStateRef State = C.getState();
if (CE->getNumArgs() < 2)
return State;
@@ -567,7 +558,7 @@
for (unsigned int i = 1; i < CE->getNumArgs(); ++i) {
// The arguments are pointer arguments. The data they are pointing at is
// tainted after the call.
- const Expr* Arg = CE->getArg(i);
+ const Expr *Arg = CE->getArg(i);
Optional<SVal> V = getPointedToSVal(C, Arg);
if (V)
State = State->addTaint(*V);
@@ -593,7 +584,8 @@
return false;
// Get it's symbol and find the declaration region it's pointing to.
- const SymbolRegionValue *Sm =dyn_cast<SymbolRegionValue>(SymReg->getSymbol());
+ const SymbolRegionValue *Sm =
+ dyn_cast<SymbolRegionValue>(SymReg->getSymbol());
if (!Sm)
return false;
const DeclRegion *DeclReg = dyn_cast_or_null<DeclRegion>(Sm->getRegion());
@@ -602,14 +594,14 @@
// This region corresponds to a declaration, find out if it's a global/extern
// variable named stdin with the proper type.
- if (const VarDecl *D = dyn_cast_or_null<VarDecl>(DeclReg->getDecl())) {
+ if (const auto *D = dyn_cast_or_null<VarDecl>(DeclReg->getDecl())) {
D = D->getCanonicalDecl();
- if ((D->getName().find("stdin") != StringRef::npos) && D->isExternC())
- if (const PointerType * PtrTy =
- dyn_cast<PointerType>(D->getType().getTypePtr()))
- if (PtrTy->getPointeeType().getCanonicalType() ==
- C.getASTContext().getFILEType().getCanonicalType())
- return true;
+ if ((D->getName().find("stdin") != StringRef::npos) && D->isExternC()) {
+ const auto *PtrTy = dyn_cast<PointerType>(D->getType().getTypePtr());
+ if (PtrTy && PtrTy->getPointeeType().getCanonicalType() ==
+ C.getASTContext().getFILEType().getCanonicalType())
+ return true;
+ }
}
return false;
}
@@ -625,8 +617,7 @@
return false;
for (const auto *Format : FDecl->specific_attrs<FormatAttr>()) {
ArgNum = Format->getFormatIdx() - 1;
- if ((Format->getType()->getName() == "printf") &&
- CE->getNumArgs() > ArgNum)
+ if ((Format->getType()->getName() == "printf") && CE->getNumArgs() > ArgNum)
return true;
}
@@ -667,36 +658,36 @@
return false;
}
-bool GenericTaintChecker::checkUncontrolledFormatString(const CallExpr *CE,
- CheckerContext &C) const{
+bool GenericTaintChecker::checkUncontrolledFormatString(
+ const CallExpr *CE, CheckerContext &C) const {
// Check if the function contains a format string argument.
unsigned int ArgNum = 0;
if (!getPrintfFormatArgumentNum(CE, C, ArgNum))
return false;
- // If either the format string content or the pointer itself are tainted, warn.
+ // If either the format string content or the pointer itself are tainted,
+ // warn.
return generateReportIfTainted(CE->getArg(ArgNum),
MsgUncontrolledFormatString, C);
}
-bool GenericTaintChecker::checkSystemCall(const CallExpr *CE,
- StringRef Name,
+bool GenericTaintChecker::checkSystemCall(const CallExpr *CE, StringRef Name,
CheckerContext &C) const {
// TODO: It might make sense to run this check on demand. In some cases,
// we should check if the environment has been cleansed here. We also might
// need to know if the user was reset before these calls(seteuid).
unsigned ArgNum = llvm::StringSwitch<unsigned>(Name)
- .Case("system", 0)
- .Case("popen", 0)
- .Case("execl", 0)
- .Case("execle", 0)
- .Case("execlp", 0)
- .Case("execv", 0)
- .Case("execvp", 0)
- .Case("execvP", 0)
- .Case("execve", 0)
- .Case("dlopen", 0)
- .Default(UINT_MAX);
+ .Case("system", 0)
+ .Case("popen", 0)
+ .Case("execl", 0)
+ .Case("execle", 0)
+ .Case("execlp", 0)
+ .Case("execv", 0)
+ .Case("execvp", 0)
+ .Case("execvP", 0)
+ .Case("execve", 0)
+ .Case("dlopen", 0)
+ .Default(UINT_MAX);
if (ArgNum == UINT_MAX || CE->getNumArgs() < (ArgNum + 1))
return false;
@@ -712,8 +703,8 @@
// If the function has a buffer size argument, set ArgNum.
unsigned ArgNum = InvalidArgIndex;
unsigned BId = 0;
- if ( (BId = FDecl->getMemoryFunctionKind()) )
- switch(BId) {
+ if ((BId = FDecl->getMemoryFunctionKind()))
+ switch (BId) {
case Builtin::BImemcpy:
case Builtin::BImemmove:
case Builtin::BIstrncpy:
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