binfmt_elf.c EI_CLASS check patch

[Chris Rohlf]

During some research of mine I realized most of my ELF analysis tools
break on ELF objects with an ELF header e_ident[EI_CLASS] not equal to
ELFCLASS32 or ELFCLASS64. These objects still work fine because the
ELF  loader code does not check this value upon execution. So I wrote
a quick  patch to do it.

--- binfmt_elf.c.or1    2007-02-25 18:46:29.000000000 -0500
+++ binfmt_elf.c        2007-02-25 17:35:29.000000000 -0500
@@ -573,6 +573,10 @@ static int load_elf_binary(struct linux_
      if (!bprm->file->f_op||!bprm->file->f_op->mmap)
              goto out;

+        if (loc->elf_ex.e_ident[EI_CLASS] != ELFCLASS32 &&
+                loc->elf_ex.e_ident[EI_CLASS] != ELFCLASS64)
+                goto out;
+
      /* Now read in all of the header information */
      if (loc->elf_ex.e_phentsize != sizeof(struct elf_phdr))
              goto out;


I am not on the list, please CC replies to me.

Chris

--

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