Default to an entry address of 0 for shared libraries.

Resolves: #2004952

binutils-ld-default-entry-of-0-for-shared.patch

@@ -0,0 +1,26 @@
+--- binutils.orig/ld/ldlang.c	2021-09-17 10:38:18.073366643 +0100
++++ binutils-2.37/ld/ldlang.c	2021-09-17 10:50:50.155450530 +0100
+@@ -6978,7 +6978,8 @@ lang_end (void)
+ 	  if (!bfd_set_start_address (link_info.output_bfd, val))
+ 	    einfo (_("%F%P: can't set start address\n"));
+ 	}
+-      else
++      /* BZ 2004952: Only use the start of the .text section for executables.  */
++      else if bfd_link_executable (&link_info)
+ 	{
+ 	  asection *ts;
+ 
+@@ -7004,6 +7005,13 @@ lang_end (void)
+ 		       entry_symbol.name);
+ 	    }
+ 	}
++      else
++	{
++	  if (warn)
++	    einfo (_("%P: warning: cannot find entry symbol %s;"
++		     " not setting start address\n"),
++		   entry_symbol.name);
++	}
+     }
+ }
+ 

binutils.spec

@@ -39,7 +39,7 @@
 Summary: A GNU collection of binary utilities
 Name: binutils%{?name_cross}%{?_with_debug:-debug}
 Version: 2.37
-Release: 12%{?dist}
+Release: 13%{?dist}
 License: GPLv3+
 URL: https://sourceware.org/binutils
 
@@ -296,6 +296,11 @@ Patch20: binutils-bfd-close-fds.patch
 # Lifetime: Fixed in 2.38 (maybe ?)
 Patch21: binutils-autoconf-version.patch
 
+# Purpose:  Set the entry address of shared libraries to 0, so that they can
+#           be detected by the loader and not run as an executable.
+# Lifetime: Permanent.
+Patch22: binutils-ld-default-entry-of-0-for-shared.patch
+
 #----------------------------------------------------------------------------
 
 Provides: bundled(libiberty)
@@ -905,6 +910,9 @@ exit 0
 
 #----------------------------------------------------------------------------
 %changelog
+* Fri Sep 17 2021 Nick Clifton  <nickc@redhat.com> - 2.27-13
+- Default to an entry address of 0 for shared libraries.  (#2004952)
+
 * Mon Sep 13 2021 Tom Stellard <tstellar@redhat.com> - 2.37-12
 - Disable LTO on arm. (#1918924)