018004d9d1
It is important that fastbootd is able to mount /metadata in recovery, in
order to check whether Virtual A/B snapshots are present. This is
enabled on userdebug builds, but currently fails on user builds.
Fixes:
audit: type=1400 audit(7258310.023:24): avc: denied { mount } for pid=511 comm="fastbootd" name="/" dev="sda15" ino=2 scontext=u:r:fastbootd:s0 tcontext=u:object_r:labeledfs:s0 tclass=filesystem permissive=0
Bug: 181097763
Test: fastboot flash on user build
Change-Id: I1abeeaa3109e08755a1ba44623a46b12d9bfdedc
118 lines
3.9 KiB
Text
118 lines
3.9 KiB
Text
# fastbootd (used in recovery init.rc for /sbin/fastbootd)
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# Declare the domain unconditionally so we can always reference it
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# in neverallow rules.
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type fastbootd, domain;
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# But the allow rules are only included in the recovery policy.
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# Otherwise fastbootd is only allowed the domain rules.
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recovery_only(`
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# fastbootd can only use HALs in passthrough mode
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passthrough_hal_client_domain(fastbootd, hal_bootctl)
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# Access /dev/usb-ffs/fastbootd/ep0
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allow fastbootd functionfs:dir search;
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allow fastbootd functionfs:file rw_file_perms;
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allowxperm fastbootd functionfs:file ioctl { FUNCTIONFS_ENDPOINT_DESC };
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# Log to serial
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allow fastbootd kmsg_device:chr_file { open getattr write };
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# battery info
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allow fastbootd sysfs_batteryinfo:file r_file_perms;
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allow fastbootd device:dir r_dir_perms;
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# For dev/block/by-name dir
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allow fastbootd block_device:dir r_dir_perms;
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# Needed for DM_DEV_CREATE ioctl call
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allow fastbootd self:capability sys_admin;
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unix_socket_connect(fastbootd, recovery, recovery)
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# Required for flashing
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allow fastbootd dm_device:chr_file rw_file_perms;
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allow fastbootd dm_device:blk_file rw_file_perms;
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allow fastbootd cache_block_device:blk_file rw_file_perms;
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allow fastbootd super_block_device_type:blk_file rw_file_perms;
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allow fastbootd {
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boot_block_device
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metadata_block_device
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system_block_device
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userdata_block_device
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}:blk_file { w_file_perms getattr ioctl };
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# For disabling/wiping GSI, and for modifying/deleting files created via
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# libfiemap.
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allow fastbootd metadata_block_device:blk_file r_file_perms;
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allow fastbootd {rootfs tmpfs}:dir mounton;
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allow fastbootd metadata_file:dir { search getattr mounton };
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allow fastbootd gsi_metadata_file_type:dir rw_dir_perms;
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allow fastbootd gsi_metadata_file_type:file create_file_perms;
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allowxperm fastbootd super_block_device_type:blk_file ioctl { BLKIOMIN BLKALIGNOFF };
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allowxperm fastbootd {
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metadata_block_device
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userdata_block_device
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dm_device
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cache_block_device
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}:blk_file ioctl { BLKSECDISCARD BLKDISCARD };
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allow fastbootd misc_block_device:blk_file rw_file_perms;
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allow fastbootd proc_cmdline:file r_file_perms;
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allow fastbootd rootfs:dir r_dir_perms;
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# Needed to read fstab node from device tree.
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allow fastbootd sysfs_dt_firmware_android:file r_file_perms;
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allow fastbootd sysfs_dt_firmware_android:dir r_dir_perms;
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# Needed because libdm reads sysfs to validate when a dm path is ready.
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r_dir_file(fastbootd, sysfs_dm)
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# Needed for realpath() call to resolve symlinks.
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allow fastbootd block_device:dir getattr;
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userdebug_or_eng(`
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# Refined manipulation of /mnt/scratch, without these perms resorts
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# to deleting scratch partition when partition(s) are flashed.
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allow fastbootd self:process setfscreate;
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allow fastbootd cache_file:dir search;
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allow fastbootd proc_filesystems:file { getattr open read };
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allow fastbootd self:capability sys_rawio;
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dontaudit fastbootd kernel:system module_request;
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allowxperm fastbootd dev_type:blk_file ioctl BLKROSET;
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allow fastbootd overlayfs_file:dir { create_dir_perms mounton };
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allow fastbootd {
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system_file_type
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unlabeled
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vendor_file_type
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}:dir { remove_name rmdir search write };
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allow fastbootd {
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overlayfs_file
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system_file_type
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unlabeled
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vendor_file_type
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}:{ file lnk_file } unlink;
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allow fastbootd tmpfs:dir rw_dir_perms;
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# Fetch vendor_boot partition
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allow fastbootd boot_block_device:blk_file r_file_perms;
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')
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# Allow using libfiemap/gsid directly (no binder in recovery).
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allow fastbootd gsi_metadata_file_type:dir search;
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allow fastbootd ota_metadata_file:dir rw_dir_perms;
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allow fastbootd ota_metadata_file:file create_file_perms;
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')
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###
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### neverallow rules
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###
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# Write permission is required to wipe userdata
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# until recovery supports vold.
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neverallow fastbootd {
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data_file_type
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}:file { no_x_file_perms };
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