[Bug 1761153] Re: qemu-user incorrect mmap for large files on 64bits host and 32bits executable.

[Launchpad Bug Tracker]

[Expired for QEMU because there has been no activity for 60 days.]

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

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https://bugs.launchpad.net/bugs/1761153

Title:
  qemu-user incorrect mmap for large files on 64bits host and 32bits
  executable.

Status in QEMU:
  Expired

Bug description:
  qemu-user seems to incorrectly mmap a file if the offset is > 4GiB and
  guest binary is 32 bits elf.

  See attached test program `test_mmap.c`.

  ```
  $ gcc -g -m32 -march=i386 test_mmap.c -o test_mmap
  $ file test_mmap
  test_mmap: ELF 32-bit LSB executable, Intel 80386, version 1 (SYSV), 
dynamically linked, interpreter /lib/ld-linux.so.2, for GNU/Linux 3.2.0, 
BuildID[sha1]=e36db05f4dfd8a9cfde8a969214a242c1f5a4b49, with debug_info, not 
stripped
  $ uname -a
  Linux localhost.localdomain 4.15.10-300.fc27.x86_64 #1 SMP Thu Mar 15 
17:13:04 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux
  $ qemu-i386 --version
  qemu-i386 version 2.10.1(qemu-2.10.1-2.fc27)
  Copyright (c) 2003-2017 Fabrice Bellard and the QEMU Project developers
  $ ./test_mmap
  $ qemu-i386 test_mmap
  Incorrect data 1
  ```

  Tested with qemu-i386 packaged in Fedora 27 and qemu-i386 compiled
  from git master (094b62cd9c)

  The issue was firstly detected on (more complex program) using qemu-
  arm (with 32bits binary) so it is probably a 32/64bits problem
  independently of the cpu family.

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