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DescriptionKaterina Koukiou
2019-07-23 13:26:07 UTC
Description of problem:
When running guests with TCG instead of KVM, I can see in the journal the following avc denials
avc: denied { search } for pid=6542 comm="qemu-kvm" name="1636" dev="proc" ino=33592 scontext=system_u:system_r:svirt_tcg_t:s0:c638,c665 tcontext=system_u:system_r:virtd_t:s0-s0:c0.c1023 tclass=dir
Version-Release number of selected component (if applicable):
selinux-policy-3.14.3-8.el8.noarch
qemu-kvm-common-2.12.0-77.module+el8.1.0+3382+49219945.x86_64
How reproducible:
Always
Steps to Reproduce:
1. modprobe -r kvm_intel && modprobe -r kvm_amd && modprobe -r kvm
2. Run a guest with virt-install like,
virt-install --connect qemu:///system --name test --os-variant cirros0.4.0 --memory 256 --quiet --disk /var/lib/libvirt/images/example.img,device=disk --noautoconsole --import --graphics spice,listen=127.0.0.1 --graphics vnc,listen=127.0.0.1
3. See avc denial in the journal
Actual results:
There is already existing rule for this, but not for TCG.
See
# echo "avc: denied { search } for pid=6542 comm="^Cmu-kvm" name="1636" dev="proc" ino=33592 scontext=system_u:system_r:svirt_tcg_t:s0:c638,c665 tcontext=system_u:system_r:virtd_t:s0-s0:c0.c1023 tclass=dir permissive=0" | audit2allow
#============= svirt_tcg_t ==============
#!!!! This avc is a constraint violation. You would need to modify the attributes of either the source or target types to allow this access.
#Constraint rule:
# mlsconstrain dir { ioctl read lock search } ((h1 dom h2 -Fail-) or (t1 != mcs_constrained_type -Fail-) ); Constraint DENIED
# Possible cause is the source level (s0:c638,c665) and target level (s0-s0:c0.c1023) are different.
allow svirt_tcg_t virtd_t:dir search;
But replacing svirt_tcg_t with svirt_t would whitelist it:
# echo "avc: denied { search } for pid=6542 comm="qemu-kvm" name="1636" dev="proc" ino=33592 scontext=system_u:system_r:svirt_t:s0:c638,c665 tcontext=system_u:system_r:virtd_t:s0-s0:c0.c1023 tclass=dir permissive=0" | audit2allow
#============= svirt_t ==============
#!!!! This avc has a dontaudit rule in the current policy
allow svirt_t virtd_t:dir search;
Expected results:
The above rule should be extended, to include also svirt_tcg_t.
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-2019:3547
Description of problem: When running guests with TCG instead of KVM, I can see in the journal the following avc denials avc: denied { search } for pid=6542 comm="qemu-kvm" name="1636" dev="proc" ino=33592 scontext=system_u:system_r:svirt_tcg_t:s0:c638,c665 tcontext=system_u:system_r:virtd_t:s0-s0:c0.c1023 tclass=dir Version-Release number of selected component (if applicable): selinux-policy-3.14.3-8.el8.noarch qemu-kvm-common-2.12.0-77.module+el8.1.0+3382+49219945.x86_64 How reproducible: Always Steps to Reproduce: 1. modprobe -r kvm_intel && modprobe -r kvm_amd && modprobe -r kvm 2. Run a guest with virt-install like, virt-install --connect qemu:///system --name test --os-variant cirros0.4.0 --memory 256 --quiet --disk /var/lib/libvirt/images/example.img,device=disk --noautoconsole --import --graphics spice,listen=127.0.0.1 --graphics vnc,listen=127.0.0.1 3. See avc denial in the journal Actual results: There is already existing rule for this, but not for TCG. See # echo "avc: denied { search } for pid=6542 comm="^Cmu-kvm" name="1636" dev="proc" ino=33592 scontext=system_u:system_r:svirt_tcg_t:s0:c638,c665 tcontext=system_u:system_r:virtd_t:s0-s0:c0.c1023 tclass=dir permissive=0" | audit2allow #============= svirt_tcg_t ============== #!!!! This avc is a constraint violation. You would need to modify the attributes of either the source or target types to allow this access. #Constraint rule: # mlsconstrain dir { ioctl read lock search } ((h1 dom h2 -Fail-) or (t1 != mcs_constrained_type -Fail-) ); Constraint DENIED # Possible cause is the source level (s0:c638,c665) and target level (s0-s0:c0.c1023) are different. allow svirt_tcg_t virtd_t:dir search; But replacing svirt_tcg_t with svirt_t would whitelist it: # echo "avc: denied { search } for pid=6542 comm="qemu-kvm" name="1636" dev="proc" ino=33592 scontext=system_u:system_r:svirt_t:s0:c638,c665 tcontext=system_u:system_r:virtd_t:s0-s0:c0.c1023 tclass=dir permissive=0" | audit2allow #============= svirt_t ============== #!!!! This avc has a dontaudit rule in the current policy allow svirt_t virtd_t:dir search; Expected results: The above rule should be extended, to include also svirt_tcg_t.