You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
49 lines
1.7 KiB
49 lines
1.7 KiB
# Any fsck program run on untrusted block devices |
|
type fsck_untrusted, domain; |
|
|
|
# Inherit and use pty created by android_fork_execvp_ext(). |
|
allow fsck_untrusted devpts:chr_file { read write ioctl getattr }; |
|
|
|
# Allow stdin/out back to vold |
|
allow fsck_untrusted vold:fd use; |
|
allow fsck_untrusted vold:fifo_file { read write getattr }; |
|
|
|
# Run fsck on vold block devices |
|
allow fsck_untrusted block_device:dir search; |
|
allow fsck_untrusted vold_device:blk_file rw_file_perms; |
|
|
|
r_dir_file(fsck_untrusted, proc) |
|
|
|
# To determine if it is safe to run fsck on a filesystem, e2fsck |
|
# must first determine if the filesystem is mounted. To do that, |
|
# e2fsck scans through /proc/mounts and collects all the mounted |
|
# block devices. With that information, it runs stat() on each block |
|
# device, comparing the major and minor numbers to the filesystem |
|
# passed in on the command line. If there is a match, then the filesystem |
|
# is currently mounted and running fsck is dangerous. |
|
# Allow stat access to all block devices so that fsck can compare |
|
# major/minor values. |
|
allow fsck_untrusted dev_type:blk_file getattr; |
|
|
|
### |
|
### neverallow rules |
|
### |
|
|
|
# Untrusted fsck should never be run on block devices holding sensitive data |
|
neverallow fsck_untrusted { |
|
boot_block_device |
|
frp_block_device |
|
metadata_block_device |
|
recovery_block_device |
|
root_block_device |
|
swap_block_device |
|
system_block_device |
|
userdata_block_device |
|
cache_block_device |
|
dm_device |
|
}:blk_file no_rw_file_perms; |
|
|
|
# Only allow entry from vold via fsck binaries |
|
neverallow { domain -vold } fsck_untrusted:process transition; |
|
neverallow * fsck_untrusted:process dyntransition; |
|
neverallow fsck_untrusted { file_type fs_type -fsck_exec }:file entrypoint;
|
|
|