** Description changed: http://lists.gnu.org/archive/html/qemu-devel/2012-01/msg02053.html Upstream QEMU commit: eed968607d656a218712df47a5e0432c21fd6994 hw/9pfs: Remove O_NOATIME flag from 9pfs open() calls in readonly mode When a 9p filesystem is exported with the readonly flag, QEMU adds the O_NOATIME flag to all accesses. This causes all reads to fail when qemu is run as non-root and the runas user doesn't own the files being accessed. The patch is a one-liner; please add it to the distribution patches. + + Steps to reproduce: + 1. Download ubuntu-12.04.1-desktop-amd64.iso + 2. As a non-root user, + + $ mkdir testdir + $ echo "value" > testdir/testfile + $ sudo chown -R root:root testdir + + 3. Start the VM, again as a non-root user: + + $ qemu-system-x86_64 -cdrom /path/to/ubuntu-12.04.1-desktop-amd64.iso -vga std -m 2048 \ + -fsdev local,id=foo,path=testdir,security_model=none,readonly \ + -device virtio-9p-pci,fsdev=foo,mount_tag=foo + + 4. Inside the VM, select "Try Ubuntu", open a terminal, and run: + + $ sudo mount -t 9p -o trans=virtio,version=9p2000.L,ro foo /mnt + $ ls /mnt + testfile + $ cat /mnt/testfile + + Expected results: + value + + Actual results: + cat: /mnt/testfile: operation not permitted
-- You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to qemu-kvm in Ubuntu. https://bugs.launchpad.net/bugs/1091430 Title: 9p fails with readonly+non-root due to O_NOATIME To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/qemu-kvm/+bug/1091430/+subscriptions -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs
