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[Qemu-devel] [Bug 1779955] Re: qemu-arm-static read() doesn't accept mma
From: |
Ke Liu |
Subject: |
[Qemu-devel] [Bug 1779955] Re: qemu-arm-static read() doesn't accept mmap address as destination |
Date: |
Wed, 04 Jul 2018 00:10:32 -0000 |
** Tags added: arm
** Tags added: linux-user
** Tags added: qemu
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https://bugs.launchpad.net/bugs/1779955
Title:
qemu-arm-static read() doesn't accept mmap address as destination
Status in QEMU:
New
Bug description:
When read() function takes an mmap'ed address as output buffer, it
returns EFAULT. The expected behavior is it should just work.
The following code works for qemu-system-arm, but not for qemu-arm-
static.
QEMU version affected: latest release 2.12.0.
Steps to reproduce (please substitute /path/to/qemu-arm-static with
the path of the binary, and /tmp/a.cpp with the example source code
attached):
# First register binfmt_misc
[hidden]$ docker run --rm --privileged multiarch/qemu-user-static:register
--reset
# Compile the code and run
[hidden]$ docker run --rm -it -v /tmp/a.cpp:/tmp/a.cpp -v
/path/to/qemu-arm-static:/usr/bin/qemu-arm-static arm32v7/ubuntu:18.04 bash -c
'{ apt update -y && apt install -y g++; } >& /dev/null && g++ -std=c++14
/tmp/a.cpp -o /tmp/a.out && echo hehe > /tmp/haha.txt && /tmp/a.out'
ofd=3
ftruncate=0
mmap=0xff3f5000
fd=4
0xff3f5023 -1 14
The expected result in qemu-system-arm as well as natively on x86_64 host:
hidden$ ./a.out
ofd=3
ftruncate=0
mmap=0xb6fb7000
fd=4
0xb6fb7023 5 0
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