PWN-Hunter/android_system_sepolicy
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run-as policy fixes.

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- Remove dac_read_search as it is no longer required by run-as.
- Introduce a separate type for /dev/tty so that we can allow use of own tty for
for a run-as shell without allowing access to other /dev/tty[0-9]* nodes.
- Allow sigchld notifications for death of run-as and its descendants by adbd.
- Drop redundant rules for executing shell or system commands from untrusted_app;
now covered by rules in app.te.

Change-Id: Ic3bf7bee9eeabf9ad4a20f61fbb142a64bb37c6c
This commit is contained in:
Stephen Smalley 2013-04-05 14:22:27 -04:00
parent 8bb308016f
commit cd516a3266
4 changed files with 7 additions and 7 deletions
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1
device.te
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@ -33,6 +33,7 @@ type random_device, dev_type;
type sensors_device, dev_type;
type serial_device, dev_type;
type socket_device, dev_type;
type owntty_device, dev_type, mlstrustedobject;
type tty_device, dev_type;
type urandom_device, dev_type;
type video_device, dev_type;

1
domain.te
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@ -44,6 +44,7 @@ allow domain dev_type:lnk_file read;
allow domain devpts:dir search;
allow domain device:file read;
allow domain socket_device:dir search;
allow domain owntty_device:chr_file rw_file_perms;
allow domain null_device:chr_file rw_file_perms;
allow domain zero_device:chr_file r_file_perms;
allow domain ashmem_device:chr_file rw_file_perms;

1
file_contexts
View File

@ -101,6 +101,7 @@
/dev/spdif_out.* u:object_r:audio_device:s0
/dev/tegra.* u:object_r:video_device:s0
/dev/tf_driver u:object_r:tee_device:s0
/dev/tty u:object_r:owntty_device:s0
/dev/tty[0-9]* u:object_r:tty_device:s0
/dev/ttyS[0-9]* u:object_r:serial_device:s0
/dev/tun u:object_r:tun_device:s0

11
runas.te
View File

@ -19,15 +19,15 @@ dontaudit shell self:capability { sys_ptrace kill };
# ndk-gdb invokes adb shell run-as.
domain_auto_trans(shell, runas_exec, runas)
allow runas adbd:process sigchld;
allow runas shell:fd use;
allow runas devpts:chr_file { read write };
allow runas devpts:chr_file { read write ioctl };
# run-as reads package information.
allow runas system_data_file:file r_file_perms;
# run-as checks and changes to the app data dir.
dontaudit runas self:capability dac_override;
allow runas self:capability dac_read_search;
allow runas app_data_file:dir { getattr search };
# run-as switches to the app UID/GID.
@ -41,18 +41,15 @@ allow runas untrusted_app:process dyntransition; # setcon
# run-as runs lib/gdbserver from the app data dir.
allow untrusted_app system_data_file:file rx_file_perms;
# run-as may also run sh or system commands.
allow untrusted_app shell_exec:file rx_file_perms;
allow untrusted_app system_file:file rx_file_perms;
# gdbserver reads the zygote.
allow untrusted_app zygote_exec:file r_file_perms;
# (grand)child death notification.
allow untrusted_app shell:process sigchld;
allow untrusted_app adbd:process sigchld;
# child shell or gdbserver pty access.
allow untrusted_app devpts:chr_file { getattr read write };
allow untrusted_app devpts:chr_file { getattr read write ioctl };
# gdbserver creates a socket in the app data dir.
allow untrusted_app app_data_file:sock_file { create unlink };