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99 lines
4.4 KiB
99 lines
4.4 KiB
4 months ago
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# otapreopt_chroot executable
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typeattribute otapreopt_chroot coredomain;
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type otapreopt_chroot_exec, exec_type, file_type, system_file_type;
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# Chroot preparation and execution.
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# We need to create an unshared mount namespace, and then mount /data.
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allow otapreopt_chroot postinstall_file:dir { search mounton };
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allow otapreopt_chroot apex_mnt_dir:dir mounton;
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allow otapreopt_chroot device:dir mounton;
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allow otapreopt_chroot linkerconfig_file:dir mounton;
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allow otapreopt_chroot rootfs:dir mounton;
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allow otapreopt_chroot sysfs:dir mounton;
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allow otapreopt_chroot system_data_root_file:dir mounton;
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allow otapreopt_chroot system_file:dir mounton;
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allow otapreopt_chroot vendor_file:dir mounton;
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allow otapreopt_chroot self:global_capability_class_set { sys_admin sys_chroot };
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# This is required to mount /vendor and mount/unmount ext4 images from
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# APEX packages in /postinstall/apex.
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allow otapreopt_chroot block_device:dir search;
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allow otapreopt_chroot labeledfs:filesystem { mount unmount };
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# This is required for dynamic partitions.
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allow otapreopt_chroot dm_device:chr_file rw_file_perms;
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# This is required to unmount flattened APEX packages under
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# /postinstall/system/apex (which are bind-mounted in /postinstall/apex).
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allow otapreopt_chroot postinstall_file:filesystem unmount;
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# Mounting /vendor can have this side-effect. Ignore denial.
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dontaudit otapreopt_chroot kernel:process setsched;
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# Allow otapreopt_chroot to read SELinux policy files.
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allow otapreopt_chroot file_contexts_file:file r_file_perms;
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# Allow otapreopt_chroot to open and read the contents of /postinstall/system/apex.
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allow otapreopt_chroot postinstall_file:dir r_dir_perms;
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# Allow otapreopt_chroot to read the persist.apexd.verity_on_system system property.
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get_prop(otapreopt_chroot, apexd_prop)
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# Allow otapreopt to use file descriptors from update-engine. It will
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# close them immediately.
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allow otapreopt_chroot postinstall:fd use;
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allow otapreopt_chroot update_engine:fd use;
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allow otapreopt_chroot update_engine:fifo_file write;
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# Allow to transition to postinstall_dexopt, to run otapreopt in its own sandbox.
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domain_auto_trans(otapreopt_chroot, postinstall_dexopt_exec, postinstall_dexopt)
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domain_auto_trans(otapreopt_chroot, linkerconfig_exec, linkerconfig)
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domain_auto_trans(otapreopt_chroot, apexd_exec, apexd)
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# Allow otapreopt_chroot to control linkerconfig
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allow otapreopt_chroot linkerconfig_file:dir { create_dir_perms relabelto };
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allow otapreopt_chroot linkerconfig_file:file create_file_perms;
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# Allow otapreopt_chroot to create loop devices with /dev/loop-control.
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allow otapreopt_chroot loop_control_device:chr_file rw_file_perms;
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# Allow otapreopt_chroot to access loop devices.
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allow otapreopt_chroot loop_device:blk_file rw_file_perms;
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allowxperm otapreopt_chroot loop_device:blk_file ioctl {
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LOOP_CONFIGURE
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LOOP_GET_STATUS64
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LOOP_SET_STATUS64
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LOOP_SET_FD
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LOOP_SET_BLOCK_SIZE
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LOOP_SET_DIRECT_IO
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LOOP_CLR_FD
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BLKFLSBUF
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};
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# Allow otapreopt_chroot to configure read-ahead of loop devices.
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allow otapreopt_chroot sysfs_loop:dir r_dir_perms;
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allow otapreopt_chroot sysfs_loop:file rw_file_perms;
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# Allow otapreopt_chroot to mount a tmpfs filesystem in /postinstall/apex.
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allow otapreopt_chroot tmpfs:filesystem mount;
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# Allow otapreopt_chroot to restore the security context of /postinstall/apex.
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allow otapreopt_chroot tmpfs:dir relabelfrom;
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allow otapreopt_chroot postinstall_apex_mnt_dir:dir relabelto;
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# Allow otapreopt_chroot to manipulate directory /postinstall/apex.
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allow otapreopt_chroot postinstall_apex_mnt_dir:dir create_dir_perms;
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allow otapreopt_chroot postinstall_apex_mnt_dir:file create_file_perms;
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# Allow otapreopt_chroot to mount APEX packages in /postinstall/apex.
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allow otapreopt_chroot postinstall_apex_mnt_dir:dir mounton;
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# Allow otapreopt_chroot to access /dev/block (needed to detach loop
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# devices used by ext4 images from APEX packages).
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allow otapreopt_chroot block_device:dir r_dir_perms;
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# Allow to access the linker through the symlink.
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allow otapreopt_chroot postinstall_file:lnk_file r_file_perms;
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# Allow otapreopt_chroot to read ro.cold_boot_done prop.
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# This is a temporary solution to make sure that otapreopt_chroot doesn't block indefinetelly.
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# TODO(b/165948777): remove this once otapreopt_chroot is migrated to libapexmount.
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get_prop(otapreopt_chroot, cold_boot_done_prop)
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# allow otapreopt_chroot to run the linkerconfig from the new image.
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allow otapreopt_chroot linkerconfig_exec:file rx_file_perms;
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