b02ac32420
Allow crosvm to write a VM failure reason to virtualizationservice via the pipe provided.
Fixes this denial: avc: denied { write } for path="pipe:[95872]"
dev="pipefs" ino=95872 scontext=u:r:crosvm:s0
tcontext=u:r:virtualizationservice:s0 tclass=fifo_file
Bug: 220071963
Test: Run VM, no denial.
Change-Id: I3beedc5e715aa33209d3df0cae05f45f31e79e66
100 lines
3.7 KiB
Text
100 lines
3.7 KiB
Text
type crosvm, domain, coredomain;
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type crosvm_exec, system_file_type, exec_type, file_type;
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type crosvm_tmpfs, file_type;
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# Let crosvm open /dev/kvm.
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allow crosvm kvm_device:chr_file rw_file_perms;
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# Most other domains shouldn't access /dev/kvm.
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neverallow { domain -crosvm -ueventd -shell } kvm_device:chr_file getattr;
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neverallow { domain -crosvm -ueventd } kvm_device:chr_file ~getattr;
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neverallowxperm { domain -crosvm } kvm_device:chr_file ioctl ~{ KVM_CHECK_EXTENSION };
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# Let crosvm mlock VM memory and page tables.
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allow crosvm self:capability ipc_lock;
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# Let crosvm create temporary files.
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tmpfs_domain(crosvm)
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# Let crosvm receive file descriptors from VirtualizationService.
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allow crosvm virtualizationservice:fd use;
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# Allow sending VirtualizationService the failure reason from the VM via pipe.
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allow crosvm virtualizationservice:fifo_file write;
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# Let crosvm read the composite disk images (virtualizationservice_data_file), APEXes
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# (staging_data_file), APKs (apk_data_file and shell_data_file where the latter is for test apks in
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# /data/local/tmp), and instance.img (app_data_file). Note that the open permission is not given as
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# the files are passed as file descriptors.
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allow crosvm {
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virtualizationservice_data_file
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staging_data_file
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apk_data_file
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app_data_file
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apex_compos_data_file
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userdebug_or_eng(`shell_data_file')
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}:file { getattr read ioctl lock };
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# Allow searching the directory where the composite disk images are.
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allow crosvm virtualizationservice_data_file:dir search;
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# Don't allow crosvm to open files that it doesn't own.
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# This is important because a malicious application could try to start a VM with a composite disk
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# image referring by name to files which it doesn't have permission to open, trying to get crosvm to
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# open them on its behalf. By preventing crosvm from opening any other files we prevent this
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# potential privilege escalation. See http://b/192453819 for more discussion.
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neverallow crosvm {
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virtualizationservice_data_file
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staging_data_file
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apk_data_file
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app_data_file
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userdebug_or_eng(`-shell_data_file')
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}:file open;
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# The instance image and the composite image should be writable as well because they could represent
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# mutable disks.
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allow crosvm {
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virtualizationservice_data_file
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app_data_file
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apex_compos_data_file
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}:file write;
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# Allow crosvm to pipe console log to shell or app which could be the owner of a VM.
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allow crosvm adbd:fd use;
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allow crosvm adbd:unix_stream_socket { read write };
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# The console log can also be written to /data/local/tmp. This is not safe as the log then can be
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# visible to the processes which don't own the VM. Therefore, this is a debugging only feature.
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userdebug_or_eng(`allow crosvm shell_data_file:file w_file_perms;')
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# Don't allow crosvm to have access to ordinary vendor files that are not for VMs.
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full_treble_only(`
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neverallow crosvm {
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vendor_file_type
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-vendor_vm_file
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-vendor_vm_data_file
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# These types are not required for crosvm, but the access is granted to globally in domain.te
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# thus should be exempted here.
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-vendor_configs_file
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-vndk_sp_file
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-vendor_task_profiles_file
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}:file *;
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')
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# app_data_file (and shell_data_file for debuggable builds) is the only
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# app_data_file_type that is allowed for crosvm to read. Note that the use of
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# app_data_file is allowed only for the instance disk image. This is enforced
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# inside the virtualizationservice by checking the file context of all disk
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# image files.
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neverallow crosvm {
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app_data_file_type
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-app_data_file
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userdebug_or_eng(`-shell_data_file')
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}:file read;
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# Only virtualizationservice can run crosvm
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neverallow {
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domain
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-crosvm
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-virtualizationservice
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} crosvm_exec:file no_x_file_perms;
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