9e7a5b0a7c
It seems likely that there is no reason to keep around a number of devices that are configured to be included into the pixel kernels. Init and ueventd should be the only processes with r/w access to these devices, so auditallow rules have been added to ensure that they aren't actually used. /dev/keychord was given its own type since it's one of the few character devices that's actually legitimately used and would cause log spam in the auditallow otherwise. Bug: 33347297 Test: The phone boots without any apparent log spam. Change-Id: I3dd9557df8a9218b8c802e33ff549d15849216fb
52 lines
2.3 KiB
Text
52 lines
2.3 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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# Write to /dev/kmsg.
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allow ueventd kmsg_device:chr_file rw_file_perms;
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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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auditallow ueventd device:chr_file rw_file_perms;
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r_dir_file(ueventd, sysfs_type)
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r_dir_file(ueventd, rootfs)
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allow ueventd sysfs:file w_file_perms;
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allow ueventd sysfs_usb:file w_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 { getattr create setattr unlink };
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allow ueventd dev_type:blk_file { getattr relabelfrom relabelto create setattr unlink };
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allow ueventd self:netlink_kobject_uevent_socket create_socket_perms_no_ioctl;
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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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# Get SELinux enforcing status.
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r_dir_file(ueventd, selinuxfs)
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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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# Restrict ueventd access on block devices to maintenence operations.
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neverallow ueventd dev_type:blk_file ~{ getattr relabelfrom relabelto create setattr unlink };
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# Only relabelto as we would never want to relabelfrom kmem_device or port_device
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neverallow ueventd { kmem_device port_device }:chr_file ~{ getattr create setattr unlink relabelto };
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