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

[Thomas Huth]

The QEMU project is currently considering to move its bug tracking to another 
system. For this we need to know which bugs are still valid and which could be 
closed already. Thus we are setting older bugs to "Incomplete" now.
If you still think this bug report here is valid, then please switch the state 
back to "New" within the next 60 days, otherwise this report will be marked as 
"Expired". Or mark it as "Fix Released" if the problem has been solved with a 
newer version of QEMU already. Thank you and sorry for the inconvenience.


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

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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:
  Incomplete

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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