[PATCH] D116722: [clang] Verify ssp buffer size is a valid integer

[Alex via Phabricator via cfe-commits]

alextsao1999 created this revision.
alextsao1999 added a reviewer: compnerd.
alextsao1999 requested review of this revision.
Herald added a project: clang.
Herald added a subscriber: cfe-commits.

This patch adds to verify whether the ssp buffer size is a legal integer and a new diagnostic driver kind has been added.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D116722

Files:
  clang/include/clang/Basic/DiagnosticDriverKinds.td
  clang/lib/Driver/ToolChains/Clang.cpp


Index: clang/lib/Driver/ToolChains/Clang.cpp
===================================================================
--- clang/lib/Driver/ToolChains/Clang.cpp
+++ clang/lib/Driver/ToolChains/Clang.cpp
@@ -3187,14 +3187,26 @@
     CmdArgs.push_back(Args.MakeArgString(Twine(StackProtectorLevel)));
   }
 
+  auto IsInteger = [](StringRef Str) -> bool {
+    if (Str.empty())
+      return false;
+    for (auto &Chr : Str)
+      if (Chr < '0' || Chr > '9')
+        return false;
+    return true;
+  };
+
   // --param ssp-buffer-size=
   for (const Arg *A : Args.filtered(options::OPT__param)) {
     StringRef Str(A->getValue());
     if (Str.startswith("ssp-buffer-size=")) {
       if (StackProtectorLevel) {
-        CmdArgs.push_back("-stack-protector-buffer-size");
-        // FIXME: Verify the argument is a valid integer.
-        CmdArgs.push_back(Args.MakeArgString(Str.drop_front(16)));
+        auto BufferSize = Str.drop_front(16);
+        if (IsInteger(BufferSize)) {
+          CmdArgs.push_back("-stack-protector-buffer-size");
+          CmdArgs.push_back(Args.MakeArgString(BufferSize));
+        } else
+          D.Diag(clang::diag::err_invalid_ssp_buffer_size);
       }
       A->claim();
     }
Index: clang/include/clang/Basic/DiagnosticDriverKinds.td
===================================================================
--- clang/include/clang/Basic/DiagnosticDriverKinds.td
+++ clang/include/clang/Basic/DiagnosticDriverKinds.td
@@ -278,6 +278,8 @@
   DefaultError;
 def err_invalid_macos_32bit_deployment_target : Error<
   "32-bit targets are not supported when building for Mac Catalyst">;
+def err_invalid_ssp_buffer_size : Error<
+  "ssp buffer size is not valid">;
 def err_drv_invalid_os_in_arg : Error<"invalid OS value '%0' in '%1'">;
 def err_drv_conflicting_deployment_targets : Error<
   "conflicting deployment targets, both '%0' and '%1' are present in environment">;


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