87c114788a
There is a race in ueventd's coldboot procedure that permits creation
of device block nodes before platform devices are registered. In this case
the device node links used to compute the SELinux context are not known
and the node is created under the generic context: u:object_r:block_device:s0.
Ueventd has been patched to relabel the nodes on subsequent add events but
it needs permissions to be allowed to do it.
BUG=28388946
Signed-off-by: Mihai Serban <mihai.serban@intel.com>
(cherry picked from commit d41ad55118)
Change-Id: I26838a3a9bc19b341e7176e5dc614827232014bf
43 lines
1.9 KiB
Text
43 lines
1.9 KiB
Text
# ueventd seclabel is specified in init.rc since
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# it lives in the rootfs and has no unique file type.
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type ueventd, domain, domain_deprecated;
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tmpfs_domain(ueventd)
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# TODO: why is ueventd using __kmsg__ when it should just create
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# and use /dev/kmsg instead?
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type_transition ueventd device:chr_file klog_device "__kmsg__";
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allow ueventd klog_device:chr_file { create open write unlink };
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security_access_policy(ueventd)
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allow ueventd init:process sigchld;
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allow ueventd self:capability { chown mknod net_admin setgid fsetid sys_rawio dac_override fowner };
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allow ueventd device:file create_file_perms;
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allow ueventd device:chr_file rw_file_perms;
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allow ueventd sysfs:file rw_file_perms;
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allow ueventd sysfs_hwrandom:file w_file_perms;
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allow ueventd sysfs_zram_uevent:file w_file_perms;
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allow ueventd sysfs_type:{ file lnk_file } { relabelfrom relabelto setattr getattr };
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allow ueventd sysfs_type:dir { relabelfrom relabelto setattr r_dir_perms };
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allow ueventd sysfs_devices_system_cpu:file rw_file_perms;
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allow ueventd tmpfs:chr_file rw_file_perms;
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allow ueventd dev_type:dir create_dir_perms;
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allow ueventd dev_type:lnk_file { create unlink };
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allow ueventd dev_type:chr_file { create setattr unlink };
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allow ueventd dev_type:blk_file { relabelfrom relabelto create setattr unlink };
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allow ueventd self:netlink_kobject_uevent_socket create_socket_perms;
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allow ueventd efs_file:dir search;
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allow ueventd efs_file:file r_file_perms;
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# Use setfscreatecon() to label /dev directories and files.
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allow ueventd self:process setfscreate;
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#####
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##### neverallow rules
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#####
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# ueventd must never set properties, otherwise deadlocks may occur.
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# https://android-review.googlesource.com/#/c/133120/6/init/devices.cpp@941
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# No writing to the property socket, connecting to init, or setting properties.
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neverallow ueventd property_socket:sock_file write;
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neverallow ueventd init:unix_stream_socket connectto;
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neverallow ueventd property_type:property_service set;
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