From: Launchpad Bug Tracker <1761153@bugs.launchpad.net>
To: qemu-devel@nongnu.org
Subject: [Bug 1761153] Re: qemu-user incorrect mmap for large files on 64bits host and 32bits executable.
Date: Sun, 10 Jan 2021 04:17:33 -0000 [thread overview]
Message-ID: <161025225373.18863.12111676248942722411.malone@loganberry.canonical.com> (raw)
In-Reply-To: 152284551397.28710.6742910020765706357.malonedeb@chaenomeles.canonical.com
[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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prev parent reply other threads:[~2021-01-10 4:27 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-04-04 12:38 [Qemu-devel] [Bug 1761153] [NEW] qemu-user incorrect mmap for large files on 64bits host and 32bits executable Matthieu Gautier
2020-11-10 15:42 ` [Bug 1761153] " Thomas Huth
2021-01-10 4:17 ` Launchpad Bug Tracker [this message]
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