This is an automated cleanup. This bug report has been moved to QEMU's new bug tracker on gitlab.com and thus gets marked as 'expired' now. Please continue with the discussion here:
https://gitlab.com/qemu-project/qemu/-/issues/470 ** Changed in: qemu Status: Confirmed => Expired ** Bug watch added: gitlab.com/qemu-project/qemu/-/issues #470 https://gitlab.com/qemu-project/qemu/-/issues/470 -- You received this bug notification because you are a member of qemu- devel-ml, which is subscribed to QEMU. https://bugs.launchpad.net/bugs/1779955 Title: qemu linux-user requires read permissions on memory passed to syscalls that should only need write access Status in QEMU: Expired 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 To manage notifications about this bug go to: https://bugs.launchpad.net/qemu/+bug/1779955/+subscriptions
