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fs_mgr: overlayfs support legacy devices (marlin) Part Deux

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On legacy devices system_<other> partition is blocked from
becoming the backing store under certain circumstances.

Test: system/core/fs_mgr/tests/adb-remount-test.sh
Bug: 120448575
Bug: 123079041
Change-Id: I1803f072ca21bc116554eee1d01a1dbd2c9ed0c9
This commit is contained in:
Mark Salyzyn 2019-02-11 09:58:18 -08:00
parent 6c773be030
commit bd80e63e03
3 changed files with 8 additions and 0 deletions
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2
public/domain.te
View File

@ -608,6 +608,8 @@ neverallow {
neverallow {
domain
-fastbootd
userdebug_or_eng(`-fsck')
userdebug_or_eng(`-init')
-recovery
-update_engine
} system_block_device:blk_file { write append };

4
public/fsck.te
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@ -18,6 +18,9 @@ allow fsck block_device:dir search;
allow fsck userdata_block_device:blk_file rw_file_perms;
allow fsck cache_block_device:blk_file rw_file_perms;
allow fsck dm_device:blk_file rw_file_perms;
userdebug_or_eng(`
allow fsck system_block_device:blk_file rw_file_perms;
')
# For the block devices where we have ioctl access,
# allow at a minimum the following common fsck ioctls.
@ -55,6 +58,7 @@ neverallow fsck {
root_block_device
swap_block_device
system_block_device
userdebug_or_eng(`-system_block_device')
vold_device
}:blk_file no_rw_file_perms;

2
public/init.te
View File

@ -317,6 +317,8 @@ allow init proc_filesystems:file r_file_perms;
userdebug_or_eng(`
# Overlayfs workdir write access check during mount to permit remount,rw
allow init overlayfs_file:dir { relabelfrom mounton write };
allow init overlayfs_file:file { append };
allow init system_block_device:blk_file { write };
')
allow init {