commit 2aebf5429bb1241a3298b5b642d38f73124c2026
author Nick Kralevich <nnk@google.com> Wed May 07 10:32:39 2014 -0700
committer Dmitriy Ivanov <dimitry@google.com> Thu May 08 13:17:17 2014 -0700
tree 9380302829e56b061ee6df1b30babbe45b2bb798
parent a3ce6bdb63cc1d657d9180269bf858af9fa685bf

Remove support for non-PIE executables

Don't support the dynamic linker loading ET_EXEC executables. Only
support ET_DYN executables.

Bug: 14566672
Change-Id: Ia1f2bfffe7ea867c1cd62e67d7fd637c60c0728d

linker/linker.cpp

diff --git a/linker/linker.cpp b/linker/linker.cpp
index 08231ea..1f32f6d 100755
--- a/linker/linker.cpp
+++ b/linker/linker.cpp
@@ -2071,6 +2071,12 @@
     si->dynamic = NULL;
     si->ref_count = 1;
 
+    ElfW(Ehdr)* elf_hdr = reinterpret_cast<ElfW(Ehdr)*>(si->base);
+    if (elf_hdr->e_type != ET_DYN) {
+        __libc_format_fd(2, "error: only position independent executables (PIE) are supported.\n");
+        exit(EXIT_FAILURE);
+    }
+
     // Use LD_LIBRARY_PATH and LD_PRELOAD (but only if we aren't setuid/setgid).
     parse_LD_LIBRARY_PATH(ldpath_env);
     parse_LD_PRELOAD(ldpreload_env);