From 2776e4ffe1f4cf965a6b99201097ca7d4ee2f95c Mon Sep 17 00:00:00 2001

From: Alan Modra <amodra@gmail.com>

Date: Sun, 8 Nov 2015 09:29:00 -0800

Subject: ELF unexec: Symbol table patching

Emacs should build on ppc64el.  A problem with the bss has been fixed.

This upstream patch has been added [4/10]:

  ELF unexec: Symbol table patching

  No st_shndx value larger than SHN_LORESERVE should be changed.

  * unexelf.c (unexec): Don't adjust any st_shndx larger than

  SHN_LORESERVE.  Error on SHN_XINDEX.

Origin: upstream, commit: 190b968f189cb7d06223bb39045ec9055df67f68

Bug: http://debbugs.gnu.org/20614

Bug-Debian: http://bugs.debian.org/808347

Added-by: Rob Browning <rlb@defaultvalue.org>

---

 src/unexelf.c |    9 +++++----

 1 file changed, 5 insertions(+), 4 deletions(-)

Index: emacs-24.5/src/unexelf.c

===================================================================

--- emacs-24.5.orig/src/unexelf.c

+++ emacs-24.5/src/unexelf.c

@@ -1119,7 +1119,7 @@ temacs:

 	}

 #endif /* __sgi */

-      /* If it is the symbol table, its st_shndx field needs to be patched.  */

+      /* Patch st_shndx field of symbol table.  */

       if (new_shdr->sh_type == SHT_SYMTAB

 	  || new_shdr->sh_type == SHT_DYNSYM)

 	{

@@ -1127,9 +1127,10 @@ temacs:

 	  ElfW (Sym) *sym = (ElfW (Sym) *) (new_shdr->sh_offset + new_base);

 	  for (; num--; sym++)

 	    {

-	      if ((sym->st_shndx == SHN_UNDEF)

-		  || (sym->st_shndx == SHN_ABS)

-		  || (sym->st_shndx == SHN_COMMON))

+	      if (sym->st_shndx == SHN_XINDEX)

+		fatal ("SHT_SYMTAB_SHNDX unsupported");

+	      if (sym->st_shndx == SHN_UNDEF

+		  || sym->st_shndx >= SHN_LORESERVE)

 		continue;

 	      PATCH_INDEX (sym->st_shndx);