[PATCH 4/8] ELF unexec: Symbol table patching

[Alan Modra]

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.

diff --git a/src/unexelf.c b/src/unexelf.c
index 0065491..286ba2e 100644
--- a/src/unexelf.c
+++ b/src/unexelf.c
@@ -1118,7 +1118,7 @@ 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)
        {
@@ -1126,9 +1126,10 @@ 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);

-- 
Alan Modra
Australia Development Lab, IBM