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.
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