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

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

[Matthieu Gautier]

Public bug reported:

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.

** Affects: qemu
     Importance: Undecided
         Status: New

** Attachment added: "test_mmap.c"
   https://bugs.launchpad.net/bugs/1761153/+attachment/5101253/+files/test_mmap.c

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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:
  New

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.

To manage notifications about this bug go to:
https://bugs.launchpad.net/qemu/+bug/1761153/+subscriptions

[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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You received this bug notification because you are a member of qemu-
devel-ml, which is subscribed to QEMU.
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.

To manage notifications about this bug go to:
https://bugs.launchpad.net/qemu/+bug/1761153/+subscriptions

[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.

To manage notifications about this bug go to:
https://bugs.launchpad.net/qemu/+bug/1761153/+subscriptions