1# ueventd seclabel is specified in init.rc since
2# it lives in the rootfs and has no unique file type.
3type ueventd, domain;
4type ueventd_tmpfs, file_type;
5
6# Write to /dev/kmsg.
7allow ueventd kmsg_device:chr_file rw_file_perms;
8
9allow ueventd self:global_capability_class_set { chown mknod net_admin setgid fsetid sys_rawio dac_override dac_read_search fowner };
10allow ueventd device:file create_file_perms;
11
12r_dir_file(ueventd, rootfs)
13
14# ueventd needs write access to files in /sys to regenerate uevents
15allow ueventd sysfs_type:file w_file_perms;
16r_dir_file(ueventd, sysfs_type)
17allow ueventd sysfs_type:{ file lnk_file } { relabelfrom relabelto setattr };
18allow ueventd sysfs_type:dir { relabelfrom relabelto setattr };
19allow ueventd tmpfs:chr_file rw_file_perms;
20allow ueventd dev_type:dir create_dir_perms;
21allow ueventd dev_type:lnk_file { create unlink };
22allow ueventd dev_type:chr_file { getattr create setattr unlink };
23allow ueventd dev_type:blk_file { getattr relabelfrom relabelto create setattr unlink };
24allow ueventd self:netlink_kobject_uevent_socket create_socket_perms_no_ioctl;
25allow ueventd efs_file:dir search;
26allow ueventd efs_file:file r_file_perms;
27
28# Get SELinux enforcing status.
29r_dir_file(ueventd, selinuxfs)
30
31# Access for /vendor/ueventd.rc and /vendor/firmware
32r_dir_file(ueventd, { vendor_file_type -vendor_app_file -vendor_overlay_file })
33
34# Get file contexts for new device nodes
35allow ueventd file_contexts_file:file r_file_perms;
36
37# Use setfscreatecon() to label /dev directories and files.
38allow ueventd self:process setfscreate;
39
40# Allow ueventd to read androidboot.android_dt_dir from kernel cmdline.
41allow ueventd proc_cmdline:file r_file_perms;
42
43# Everything is labeled as rootfs in recovery mode. ueventd has to execute
44# the dynamic linker and shared libraries.
45recovery_only(`
46  allow ueventd rootfs:file { r_file_perms execute };
47')
48
49# Suppress denials for ueventd to getattr /postinstall. This occurs when the
50# linker tries to resolve paths in ld.config.txt.
51dontaudit ueventd postinstall_mnt_dir:dir getattr;
52
53# ueventd loads modules in response to modalias events.
54allow ueventd self:global_capability_class_set sys_module;
55allow ueventd vendor_file:system module_load;
56allow ueventd kernel:key search;
57
58# ueventd is using bootstrap bionic
59allow ueventd system_bootstrap_lib_file:dir r_dir_perms;
60allow ueventd system_bootstrap_lib_file:file { execute read open getattr map };
61
62#####
63##### neverallow rules
64#####
65
66# ueventd must never set properties, otherwise deadlocks may occur.
67# https://android-review.googlesource.com/#/c/133120/6/init/devices.cpp@941
68# No writing to the property socket, connecting to init, or setting properties.
69neverallow ueventd property_socket:sock_file write;
70neverallow ueventd init:unix_stream_socket connectto;
71neverallow ueventd property_type:property_service set;
72
73# Restrict ueventd access on block devices to maintenence operations.
74neverallow ueventd dev_type:blk_file ~{ getattr relabelfrom relabelto create setattr unlink };
75
76# Only relabelto as we would never want to relabelfrom port_device
77neverallow ueventd port_device:chr_file ~{ getattr create setattr unlink relabelto };
78
79# Nobody should be able to ptrace ueventd
80neverallow * ueventd:process ptrace;
81