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

[antonio barbalace]

Public bug reported:

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.

** Affects: qemu
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1830415

Title:
  linux-user elf loader issue

Status in QEMU:
  New

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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