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fs_mgr: add overlayfs handling for squashfs system filesystems

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/cache/overlay directory in support of overlayfs mounts on userdebug
and eng devices.  Overlayfs in turn can be capable of supporting
adb remount for read-only or restricted-storage filesystems like
squashfs or right-sized (zero free space) system partitions
respectively.

Test: compile
Bug: 109821005
Bug: 110985612
Change-Id: I3ece03886db7cc97f864497cf93ec6c6c39bccd1
This commit is contained in:
Mark Salyzyn 2018-06-13 08:02:29 -07:00
parent f3eb985447
commit 9b398f3fb7
10 changed files with 30 additions and 2 deletions
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8
Android.mk
View file

@ -829,7 +829,10 @@ include $(BUILD_SYSTEM)/base_rules.mk
local_fc_files := $(call build_policy, file_contexts, $(PLAT_PRIVATE_POLICY))
ifneq ($(filter address,$(SANITIZE_TARGET)),)
local_fc_files := $(local_fc_files) $(wildcard $(addsuffix /file_contexts_asan, $(PLAT_PRIVATE_POLICY)))
local_fc_files += $(wildcard $(addsuffix /file_contexts_asan, $(PLAT_PRIVATE_POLICY)))
endif
ifneq (,$(filter userdebug eng,$(TARGET_BUILD_VARIANT)))
local_fc_files += $(wildcard $(addsuffix /file_contexts_overlayfs, $(PLAT_PRIVATE_POLICY)))
endif
local_fcfiles_with_nl := $(call add_nl, $(local_fc_files), $(built_nl))
@ -917,6 +920,9 @@ local_fc_files := $(call build_policy, file_contexts, $(PLAT_PRIVATE_POLICY))
ifneq ($(filter address,$(SANITIZE_TARGET)),)
local_fc_files += $(wildcard $(addsuffix /file_contexts_asan, $(PLAT_PRIVATE_POLICY)))
endif
ifneq (,$(filter userdebug eng,$(TARGET_BUILD_VARIANT)))
local_fc_files += $(wildcard $(addsuffix /file_contexts_overlayfs, $(PLAT_PRIVATE_POLICY)))
endif
local_fcfiles_with_nl := $(call add_nl, $(local_fc_files), $(built_nl))
$(LOCAL_BUILT_MODULE): PRIVATE_FC_FILES := $(local_fcfiles_with_nl)

1
private/compat/26.0/26.0.ignore.cil
View file

@ -84,6 +84,7 @@
netd_stable_secret_prop
network_watchlist_data_file
network_watchlist_service
overlayfs_file
package_native_service
perfetto
perfetto_exec

1
private/compat/27.0/27.0.ignore.cil
View file

@ -72,6 +72,7 @@
mnt_vendor_file
network_watchlist_data_file
network_watchlist_service
overlayfs_file
perfetto
perfetto_exec
perfetto_tmpfs

1
private/compat/28.0/28.0.ignore.cil
View file

@ -9,6 +9,7 @@
llkd_exec
llkd_tmpfs
mnt_product_file
overlayfs_file
time_prop
timedetector_service
timezonedetector_service

5
private/file_contexts
View file

@ -518,6 +518,11 @@
# LocalTransport (backup) uses this subtree
/cache/backup(/.*)? u:object_r:cache_private_backup_file:s0
#############################
# Overlayfs support directories
#
/cache/overlay(/.*)? u:object_r:overlayfs_file:s0
/data/cache(/.*)? u:object_r:cache_file:s0
/data/cache/recovery(/.*)? u:object_r:cache_recovery_file:s0
# General backup/restore interchange with apps

6
private/file_contexts_overlayfs Normal file
View file

@ -0,0 +1,6 @@
#############################
# Overlayfs support directories for userdebug/eng devices
#
/cache/overlay/(system|product)/upper u:object_r:system_file:s0
/cache/overlay/(vendor|odm)/upper u:object_r:vendor_file:s0
/cache/overlay/oem/upper u:object_r:vendor_file:s0

1
private/fs_use
View file

@ -8,6 +8,7 @@ fs_use_xattr xfs u:object_r:labeledfs:s0;
fs_use_xattr btrfs u:object_r:labeledfs:s0;
fs_use_xattr f2fs u:object_r:labeledfs:s0;
fs_use_xattr squashfs u:object_r:labeledfs:s0;
fs_use_xattr overlay u:object_r:labeledfs:s0;
fs_use_xattr erofs u:object_r:labeledfs:s0;
# Label inodes from task label.

2
public/file.te
View file

@ -290,6 +290,8 @@ type system_app_data_file, file_type, data_file_type, core_data_file_type, mlstr
# Compatibility with type name used in Android 4.3 and 4.4.
# Default type for anything under /cache
type cache_file, file_type, data_file_type, core_data_file_type, mlstrustedobject;
# Type for /cache/overlay
type overlayfs_file, file_type, data_file_type, core_data_file_type;
# Type for /cache/backup_stage/* (fd interchange with apps)
type cache_backup_file, file_type, data_file_type, core_data_file_type, mlstrustedobject;
# type for anything under /cache/backup (local transport storage)

5
public/init.te
View file

@ -288,6 +288,11 @@ allow init self:global_capability2_class_set syslog;
# init access to /proc.
r_dir_file(init, proc_net_type)
# Overlayfs workdir write access check during mount to permit remount,rw
userdebug_or_eng(`
allow init overlayfs_file:dir { relabelfrom write };
')
allow init {
proc_cmdline
proc_diskstats

2
public/shell.te
View file

@ -144,7 +144,7 @@ allow shell domain:dir { search open read getattr };
allow shell domain:{ file lnk_file } { open read getattr };
# statvfs() of /proc and other labeled filesystems
# (yaffs2, jffs2, ext2, ext3, ext4, xfs, btrfs, f2fs, squashfs)
# (yaffs2, jffs2, ext2, ext3, ext4, xfs, btrfs, f2fs, squashfs, overlay)
allow shell { proc labeledfs }:filesystem getattr;
# stat() of /dev