From: espie <espie@openbsd.org>
Date: Wed, 28 Jun 2017 07:37:38 +0000 (+0000)
Subject: if we return nullptr for a "noexec" section, then don't change section.
X-Git-Url: http://artulab.com/gitweb/?a=commitdiff_plain;h=0db736d815ee5360cb95d2dafe35f5cc51193a62;p=openbsd

if we return nullptr for a "noexec" section, then don't change section.
prevents core dumps :)

okay tedu@
---

diff --git a/gnu/llvm/lib/MC/MCELFStreamer.cpp b/gnu/llvm/lib/MC/MCELFStreamer.cpp
index 0ef1b2a8bdc..fd0e3452071 100644
--- a/gnu/llvm/lib/MC/MCELFStreamer.cpp
+++ b/gnu/llvm/lib/MC/MCELFStreamer.cpp
@@ -91,8 +91,11 @@ void MCELFStreamer::InitSections(bool NoExecStack) {
   SwitchSection(Ctx.getObjectFileInfo()->getTextSection());
   EmitCodeAlignment(4);
 
-  if (NoExecStack)
-    SwitchSection(Ctx.getAsmInfo()->getNonexecutableStackSection(Ctx));
+  if (NoExecStack) {
+    MCSection *s = Ctx.getAsmInfo()->getNonexecutableStackSection(Ctx);
+    if (s) 
+	SwitchSection(s);
+  }
 }
 
 void MCELFStreamer::EmitLabel(MCSymbol *S) {