Don't accept unsuitable ELF files such as executables or core files.

Differential Revision: https://reviews.llvm.org/D42827

llvm-svn: 324041

lld/ELF/Driver.cpp

@@ -228,11 +228,15 @@ void LinkerDriver::addFile(StringRef Path, bool WithLOption) {
     Files.push_back(
         createSharedFile(MBRef, WithLOption ? path::filename(Path) : Path));
     return;
-  default:
+  case file_magic::bitcode:
+  case file_magic::elf_relocatable:
     if (InLib)
       Files.push_back(make<LazyObjFile>(MBRef, "", 0));
     else
       Files.push_back(createObjectFile(MBRef));
+    break;
+  default:
+    error(Path + ": unknown file type");
   }
 }
 

lld/test/ELF/invalid/executable.s

@@ -0,0 +1,9 @@
+# REQUIRES: x86
+# RUN: llvm-mc -filetype=obj -triple=x86_64-unknown-linux %s -o %t.o
+# RUN: ld.lld -o %t1.exe %t.o
+# RUN: not ld.lld -o %t2.exe %t1.exe 2>&1 | FileCheck %s
+# CHECK: unknown file type
+
+.global _start
+_start:
+  ret

lld/test/ELF/invalid/too-short.s

@@ -1,5 +0,0 @@
-# REQUIRES: x86
-
-## too-short.elf file is a truncated ELF.
-# RUN: not ld.lld %S/Inputs/too-short.elf -o %t 2>&1 | FileCheck %s
-# CHECK: file is too short