44 lines
1.5 KiB
C++
44 lines
1.5 KiB
C++
//===-- CommandProcessorCheck.cpp - clang-tidy ----------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "CommandProcessorCheck.h"
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#include "clang/AST/ASTContext.h"
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#include "clang/ASTMatchers/ASTMatchFinder.h"
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using namespace clang::ast_matchers;
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namespace clang {
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namespace tidy {
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namespace cert {
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void CommandProcessorCheck::registerMatchers(MatchFinder *Finder) {
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Finder->addMatcher(
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callExpr(
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callee(functionDecl(hasAnyName("::system", "::popen", "::_popen"))
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.bind("func")),
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// Do not diagnose when the call expression passes a null pointer
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// constant to system(); that only checks for the presence of a
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// command processor, which is not a security risk by itself.
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unless(callExpr(callee(functionDecl(hasName("::system"))),
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argumentCountIs(1),
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hasArgument(0, nullPointerConstant()))))
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.bind("expr"),
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this);
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}
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void CommandProcessorCheck::check(const MatchFinder::MatchResult &Result) {
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const auto *Fn = Result.Nodes.getNodeAs<FunctionDecl>("func");
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const auto *E = Result.Nodes.getNodeAs<CallExpr>("expr");
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diag(E->getExprLoc(), "calling %0 uses a command processor") << Fn;
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}
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} // namespace cert
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} // namespace tidy
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} // namespace clang
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