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[Qemu-devel] [Bug 1830415] Re: linux-user elf loader issue

From: Alex Bennée
Subject: [Qemu-devel] [Bug 1830415] Re: linux-user elf loader issue
Date: Wed, 17 Jul 2019 15:03:30 -0000

Have you got a test case? The check-tcg tests all pass and they are
statically linked elfs.

** Tags added: linux-user

** Changed in: qemu
       Status: New => Incomplete

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  linux-user elf loader issue

Status in QEMU:

Bug description:
  all versions up to 4.0 (I didn't test others)
  file affected linux-user/elfload.c
  function load_elf_image

  if (phdr[i].p_type == PT_LOAD) {
  -            abi_ulong a = phdr[i].p_vaddr - phdr[i].p_offset; 
  +            abi_ulong a = phdr[i].p_vaddr ; // - phdr[i].p_offset; 
              if (a < loaddr) {
                  loaddr = a;

  To the best of my understanding of the elf format p_offset is not a
  virtual offset. In fact, when I load statically compiled applications,
  the load fails because the libc before main is trying to access phdr
  in the executable image but that memory is not mapped -- this is
  caused by the wrong loaddr above.

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