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Red Hat Bugzilla – Full Text Bug Listing |
| Summary: | selinux policy requires ISO images to be virt_image_t | ||
|---|---|---|---|
| Product: | [Fedora] Fedora | Reporter: | Jeff Bastian <jbastian> |
| Component: | libvirt | Assignee: | Daniel Veillard <veillard> |
| Status: | CLOSED WONTFIX | QA Contact: | Fedora Extras Quality Assurance <extras-qa> |
| Severity: | medium | Docs Contact: | |
| Priority: | medium | ||
| Version: | 10 | CC: | berrange, clalance, crobinso, stijn, veillard, virt-maint |
| Target Milestone: | --- | ||
| Target Release: | --- | ||
| Hardware: | All | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | Doc Type: | Bug Fix | |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2009-08-04 11:08:14 EDT | Type: | --- |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | ||
We need a way to separate the installation of a image from the actual running of an image. The problem right now when libvirtd runs an install it call qemu to do the install. It also calls qemu when it runs an image. Since we want to lock down the running of an image we need to change this behaviour some how. A couple of choices to fix this. Execute an intemediary script or program to do the install. libvirtd->virtd_install.sh-> qemu Then I could label virtd_install.sh as virt_install_t and not transition to qemu_t when doing an install. Another thing we could do is have libvirtd call (pseudo code) con = getcon() setexeccon(con) exec(qemu) for install setexeccon(NULL) Which would stop the transition from happening on an install. Seeing this as well. Are you sure this is only a problem during install? I might want to "insert" a different CD (a.k.a. connect a different .iso file) while running a VM, let's say the next Fedora installation DVD I've just downloaded as a normal user over the internet? In Fedora 11 we introduced more advanced SELinux support into libvirt, known as 'sVirt'. With this, libvirtd will automatically relabel ISO images & diskl images to virt_image_t when required. This new code is too invasive to consider backporting to Fedora 10, so I'm closing this WONTFIX. |
Description of problem: I'm trying to create a KVM virtual machine under Fedora 10. I'm using virt-manager. I pointed it an ISO image of RHEL 5.1, and when the install tried to start, SELinux blocked it, and setroubleshooter told me that the ISO image needs to be virt_image_t. Obviously, the ISO file is not the virtual machine disk image, so it shouldn't matter what type ths ISO file is. It's currently default_t: $ ls -Z RHEL5.1-Client-20071017.0-x86_64-DVD.iso -rw-r--r-- jbastian jbastian system_u:object_r:default_t:s0 RHEL5.1-Client-20071017.0-x86_64-DVD.iso /var/log/messages contains Dec 19 08:45:44 tarantula setroubleshoot: SELinux is preventing qemu (qemu-kvm)"read" to ./RHEL5.1-Client-20071017.0-x86_64-DVD.iso (default_t). For complete SELinux messages. run sealert -l 69452186-cf86-4caf-b372-3ffb4e250c0b Full sealert text is below. I ran chcon -t virt_image_t RHEL5.1-Client-20071017.0-x86_64-DVD.iso and that allowed me to proceed. Version-Release number of selected component (if applicable): kvm-74-6.fc10.x86_64 selinux-policy-3.5.13-34.fc10.noarch selinux-policy-targeted-3.5.13-34.fc10.noarch virt-manager-0.6.0-5.fc10.x86_64 How reproducible: Every time Steps to Reproduce: 1. Try to create a virtual machine 2. Point virt-manager at an ISO file for the installation source Actual results: SELinux prevents the install from happening. Expected results: Install can use the ISO file with default_t or any other type, e.g., user_home_t if the ISO is in my home dir. Additional info: $ sudo sealert -l 69452186-cf86-4caf-b372-3ffb4e250c0b Summary: SELinux is preventing qemu (qemu-kvm) "read" to ./RHEL5.1-Client-20071017.0-x86_64-DVD.iso (default_t). Detailed Description: SELinux denied qemu access to ./RHEL5.1-Client-20071017.0-x86_64-DVD.iso. If this is a virtualization image, it has to have a file context label of virt_image_t. The system is setup to label image files in directory./var/lib/libvirt/images correctly. We recommend that you copy your image file to /var/lib/libvirt/images. If you really want to have your qemu image files in the current directory, you can relabel ./RHEL5.1-Client-20071017.0-x86_64-DVD.iso to be virt_image_t using chcon. You also need to execute semanage fcontext -a -t virt_image_t './RHEL5.1-Client-20071017.0-x86_64-DVD.iso' to add this new path to the system defaults. If you did not intend to use ./RHEL5.1-Client-20071017.0-x86_64-DVD.iso as a qemu image it could indicate either a bug or an intrusion attempt. Allowing Access: You can alter the file context by executing chcon -t virt_image_t './RHEL5.1-Client-20071017.0-x86_64-DVD.iso' You must also change the default file context files on the system in order to preserve them even on a full relabel. "semanage fcontext -a -t virt_image_t './RHEL5.1-Client-20071017.0-x86_64-DVD.iso'" Fix Command: chcon -t virt_image_t './RHEL5.1-Client-20071017.0-x86_64-DVD.iso' Additional Information: Source Context system_u:system_r:qemu_t:s0 Target Context system_u:object_r:default_t:s0 Target Objects ./RHEL5.1-Client-20071017.0-x86_64-DVD.iso [ file ] Source qemu-kvm Source Path /usr/bin/qemu-kvm Port <Unknown> Host tarantula.localdomain Source RPM Packages kvm-74-6.fc10 Target RPM Packages Policy RPM selinux-policy-3.5.13-34.fc10 Selinux Enabled True Policy Type targeted MLS Enabled True Enforcing Mode Enforcing Plugin Name qemu_file_image Host Name tarantula.localdomain Platform Linux tarantula.localdomain 2.6.27.7-134.fc10.x86_64 #1 SMP Mon Dec 1 22:21:35 EST 2008 x86_64 x86_64 Alert Count 1 First Seen Fri Dec 19 08:45:44 2008 Last Seen Fri Dec 19 08:45:44 2008 Local ID 69452186-cf86-4caf-b372-3ffb4e250c0b Line Numbers Raw Audit Messages node=tarantula.localdomain type=AVC msg=audit(1229697944.194:176): avc: denied { read } for pid=3906 comm="qemu-kvm" name="RHEL5.1-Client-20071017.0-x86_64-DVD.iso" dev=dm-1 ino=3154201 scontext=system_u:system_r:qemu_t:s0 tcontext=system_u:object_r:default_t:s0 tclass=file node=tarantula.localdomain type=SYSCALL msg=audit(1229697944.194:176): arch=c000003e syscall=2 success=no exit=-13 a0=7fffa2b01310 a1=0 a2=1a4 a3=30a276da70 items=0 ppid=2629 pid=3906 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=4294967295 comm="qemu-kvm" exe="/usr/bin/qemu-kvm" subj=system_u:system_r:qemu_t:s0 key=(null)