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Separate fsck domains to protect userdata.

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Create new vold_fsck domain that only has access to vold_block
devices to prevent any access to internal userdata.

Change-Id: I25ddcd16cbf83d7a25b70bc64d95f5345d0d5731
This commit is contained in:
Jeff Sharkey 2015-03-31 08:04:46 -07:00
parent 5895ffe1f7
commit 5a5b364c54
3 changed files with 40 additions and 9 deletions
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12
fsck.te
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@ -1,4 +1,4 @@
# Any fsck program run by init or vold
# Any fsck program run by init
type fsck, domain;
type fsck_exec, exec_type, file_type;
@ -15,11 +15,6 @@ allow fsck devpts:chr_file { read write ioctl getattr };
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 vold_device:blk_file rw_file_perms;
# Allow stdin/out back to vold
allow fsck vold:fd use;
allow fsck vold:fifo_file { read write getattr };
###
### neverallow rules
@ -34,9 +29,10 @@ neverallow fsck {
root_block_device
swap_block_device
system_block_device
vold_device
}:blk_file no_rw_file_perms;
# Only allow entry from init or vold via fsck binaries
neverallow { domain -init -vold } fsck:process transition;
# Only allow entry from init via fsck binaries
neverallow { domain -init } fsck:process transition;
neverallow domain fsck:process dyntransition;
neverallow fsck { file_type fs_type -fsck_exec }:file entrypoint;

2
vold.te
View file

@ -8,7 +8,7 @@ init_daemon_domain(vold)
domain_auto_trans(vold, sgdisk_exec, sgdisk);
domain_auto_trans(vold, blkid_exec, blkid);
domain_auto_trans(vold, sdcardd_exec, sdcardd);
domain_auto_trans(vold, fsck_exec, fsck);
domain_auto_trans(vold, fsck_exec, vold_fsck);
typeattribute vold mlstrustedsubject;
allow vold self:process setfscreate;

35
vold_fsck.te Normal file
View file

@ -0,0 +1,35 @@
# Any fsck program run by vold
type vold_fsck, domain;
# Inherit and use pty created by android_fork_execvp_ext().
allow vold_fsck devpts:chr_file { read write ioctl getattr };
# Run fsck on certain block devices
allow vold_fsck block_device:dir search;
allow vold_fsck vold_device:blk_file rw_file_perms;
# Allow stdin/out back to vold
allow vold_fsck vold:fd use;
allow vold_fsck vold:fifo_file { read write getattr };
###
### neverallow rules
###
# fsck should never be run on these block devices
neverallow vold_fsck {
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
}:blk_file no_rw_file_perms;
# Only allow entry from vold via fsck binaries
neverallow { domain -vold } vold_fsck:process transition;
neverallow domain vold_fsck:process dyntransition;
neverallow vold_fsck { file_type fs_type -fsck_exec }:file entrypoint;