5d89abde99
These denials occur on boot when android_get_control_file also
changes from readlink() to realpath(), because realpath() will
lstat() the given path.
Some other domains (fastbootd, update_engine, etc.) also uses
libcutils to write to kernel log, where android_get_control_file()
is invoked, hence getattr is added to them as well.
04-28 06:15:22.290 618 618 I auditd : type=1400 audit(0.0:4): avc: denied { getattr } for comm="logd" path="/dev/kmsg" dev="tmpfs" ino=20917 scontext=u:r:logd:s0 tcontext=u:object_r:kmsg_device:s0 tclass=chr_file permissive=0
03-20 19:52:23.431 900 900 I auditd : type=1400 audit(0.0:7): avc: denied { getattr } for comm="android.hardwar" path="/dev/kmsg" dev="tmpfs" ino=20917 scontext=u:r:hal_health_default:s0 tcontext=u:object_r:kmsg_device:s0 tclass=chr_file permissive=0
...
03-20 22:40:42.316 1 1 W init : type=1400 audit(0.0:33): avc: denied { getattr } for path="/dev/kmsg" dev="tmpfs" ino=21999 scontext=u:r:init:s0 tcontext=u:object_r:kmsg_device:s0 tclass=chr_file permissive=0
Test: no denials related to these
Change-Id: I5263dd6b64c06fb092f3461858f57a1a09107429
37 lines
1.3 KiB
Plaintext
37 lines
1.3 KiB
Plaintext
# update_verifier
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type update_verifier, domain;
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type update_verifier_exec, system_file_type, exec_type, file_type;
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# Allow update_verifier to reach block devices in /dev/block.
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allow update_verifier block_device:dir search;
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# Read care map in /data/ota_package/.
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allow update_verifier ota_package_file:dir r_dir_perms;
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allow update_verifier ota_package_file:file r_file_perms;
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# Read /sys/block to find all the DM directories like (/sys/block/dm-X).
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allow update_verifier sysfs:dir r_dir_perms;
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# Read /sys/block/dm-X/dm/name (which is a symlink to
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# /sys/devices/virtual/block/dm-X/dm/name) to identify the mapping between
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# dm-X and system/vendor partitions.
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allow update_verifier sysfs_dm:dir r_dir_perms;
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allow update_verifier sysfs_dm:file r_file_perms;
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# Read all blocks in DM wrapped system partition.
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allow update_verifier dm_device:blk_file r_file_perms;
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# Write to kernel message.
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allow update_verifier kmsg_device:chr_file { getattr w_file_perms };
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# Allow update_verifier to reboot the device.
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set_prop(update_verifier, powerctl_prop)
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# Use Boot Control HAL
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hal_client_domain(update_verifier, hal_bootctl)
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# Access Checkpoint commands over binder
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allow update_verifier vold_service:service_manager find;
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binder_call(update_verifier, servicemanager)
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binder_call(update_verifier, vold)
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