Bug 1592688
| Summary: | SELinux is preventing /usr/libexec/qemu-kvm from map access | ||
|---|---|---|---|
| Product: | Red Hat Enterprise Linux 7 | Reporter: | Junxiang Li <junli> |
| Component: | selinux-policy | Assignee: | Lukas Vrabec <lvrabec> |
| Status: | CLOSED ERRATA | QA Contact: | Milos Malik <mmalik> |
| Severity: | medium | Docs Contact: | |
| Priority: | medium | ||
| Version: | 7.6 | CC: | dzheng, fjin, junli, lhuang, lvrabec, mgrepl, mmalik, plautrba, ssekidde, yafu, yanqzhan |
| Target Milestone: | rc | Keywords: | Automation, TestBlocker |
| Target Release: | --- | Flags: | yafu:
needinfo-
|
| Hardware: | All | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | selinux-policy-3.13.1-205.el7 | Doc Type: | If docs needed, set a value |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2018-10-30 10:05:46 UTC | Type: | Bug |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
| Embargoed: | |||
| Bug Depends On: | |||
| Bug Blocks: | 1553085 | ||
Here is the same SELinux denial interpreted by ausearch -i:
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type=AVC msg=audit(06/19/2018 04:00:54.545:13947) : avc: denied { map } for pid=20718 comm=qemu-kvm path=/dev/hugepages2M/libvirt/qemu/1-avocado-vt-vm1/qemu_back_mem._objects_ram-node0.41QGRO (deleted) dev="hugetlbfs" ino=452846 scontext=system_u:system_r:svirt_t:s0:c296,c387 tcontext=system_u:object_r:svirt_image_t:s0 tclass=file permissive=0
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I wonder why is the deleted file labeled svirt_image_t. Is it really a virtual machine image? * https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html-single/virtualization_security_guide/#sect-Virtualization_Security_Guide-sVirt-Labels Sorry, I meant to write "Virtual Machine Shared Read/Write Content" instead of "Virtual Machine Image". (In reply to Milos Malik from comment #3) > I wonder why is the deleted file labeled svirt_image_t. Is it really a > virtual machine image? > > * > https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/ > html-single/virtualization_security_guide/#sect- > Virtualization_Security_Guide-sVirt-Labels Sorry, I'm not sure. Hi yafu, Could you help answer this question? This file is created by qemu-kvm (qemu will create a tmp file then mmap memory and then delete this file in this case) and the directory /dev/hugepages2M/libvirt/qemu/1-avocado-vt-vm1/ is created by libvirt and libvirt change this dir context to system_u:object_r:svirt_image_t:s0:cxxx,cxxx , that is why this file labeled svirt_image_t. I checked this issue have already been fixed in Fedora (see bug 1514538) and here is the result of sesearch in F28: # sesearch -A -s svirt_t -t svirt_image_t allow svirt_t svirt_image_t:file map; ... Add keyword "TestBlocker", it blocks several libvirt "Guest NUMA memory binding" function tests. Please resolve ASAP. Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory, and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://access.redhat.com/errata/RHBA-2018:3111 |
Description of problem: SELinux is preventing /usr/libexec/qemu-kvm from map access Additional Information: Source Context system_u:system_r:svirt_t:s0:c296,c387 Target Context system_u:object_r:svirt_image_t:s0 Target Objects Please check message Source qemu-kvm Source Path /usr/libexec/qemu-kvm Port <Unknown> Host host.example.com Source RPM Packages Target RPM Packages Policy RPM selinux-policy-3.13.1-204.el7.noarch Selinux Enabled True Policy Type targeted Enforcing Mode Enforcing Host Name host.example.com Platform Linux host.example.com kernel-3.10.0-897.el7.x86_64 Alert Count 1 First Seen <Unknown> Last Seen 2018-06-19 03:00:00 EDT Local ID <Unknown> Raw Audit Messages type=AVC msg=audit(1529373654.545:13947): avc: denied { map } for pid=20718 comm="qemu-kvm" path=2F6465762F687567657061676573324D2F6C6962766972742F71656D752F312D61766F6361646F2D76742D766D312F71656D755F6261636B5F6D656D2E5F6F626A656374735F72616D2D6E6F6465302E34315147524F202864656C6574656429 dev="hugetlbfs" ino=452846 scontext=system_u:system_r:svirt_t:s0:c296,c387 tcontext=system_u:object_r:svirt_image_t:s0 tclass=file permissive=0 Hash: qemu-kvm,svirt_t,svirt_image_t,file,map