31d88a704e
Allow vold, healthd, slideshow, and watchdogd access to /dev/kmsg.
These processes log to the kernel dmesg ring buffer, so they need
write access to that file.
Addresses the following denials:
avc: denied { write } for pid=134 comm="watchdogd" name="kmsg" dev="tmpfs" ino=9248 scontext=u:r:watchdogd:s0 tcontext=u:object_r:kmsg_device:s0 tclass=chr_file permissive=0
avc: denied { write } for pid=166 comm="healthd" name="kmsg" dev="tmpfs" ino=9248 scontext=u:r:healthd:s0 tcontext=u:object_r:kmsg_device:s0 tclass=chr_file permissive=0
avc: denied { write } for pid=180 comm="vold" name="kmsg" dev="tmpfs" ino=9248 scontext=u:r:vold:s0 tcontext=u:object_r:kmsg_device:s0 tclass=chr_file permissive=0
These denials were triggered by the change in
https://android-review.googlesource.com/151209 . Prior to that change,
any code which called klog_init would (unnecessarily) create the
device node themselves, rather than using the already existing device
node.
Drop special /dev/__null__ handling from watchdogd. As of
https://android-review.googlesource.com/148288 , watchdogd no longer
creates it's own /dev/null device, so it's unnecessary for us
to allow for it.
Drop mknod from healthd, slideshow, and watchdogd. healthd and slideshow
only needed mknod to create /dev/__kmsg__, which is now obsolete.
watchdogd only needed mknod to create /dev/__kmsg__ and /dev/__null__,
which again is now obsolete.
(cherry picked from e2651972c1)
Bug: 21242418
Change-Id: If01c8001084575e7441253f0fa8b4179ae33f534
370 lines
11 KiB
Text
370 lines
11 KiB
Text
#####################################
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# domain_trans(olddomain, type, newdomain)
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# Allow a transition from olddomain to newdomain
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# upon executing a file labeled with type.
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# This only allows the transition; it does not
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# cause it to occur automatically - use domain_auto_trans
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# if that is what you want.
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#
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define(`domain_trans', `
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# Old domain may exec the file and transition to the new domain.
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allow $1 $2:file { getattr open read execute };
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allow $1 $3:process transition;
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# New domain is entered by executing the file.
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allow $3 $2:file { entrypoint open read execute getattr };
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# New domain can send SIGCHLD to its caller.
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allow $3 $1:process sigchld;
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# Enable AT_SECURE, i.e. libc secure mode.
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dontaudit $1 $3:process noatsecure;
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# XXX dontaudit candidate but requires further study.
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allow $1 $3:process { siginh rlimitinh };
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')
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#####################################
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# domain_auto_trans(olddomain, type, newdomain)
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# Automatically transition from olddomain to newdomain
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# upon executing a file labeled with type.
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#
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define(`domain_auto_trans', `
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# Allow the necessary permissions.
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domain_trans($1,$2,$3)
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# Make the transition occur by default.
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type_transition $1 $2:process $3;
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')
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#####################################
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# file_type_trans(domain, dir_type, file_type)
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# Allow domain to create a file labeled file_type in a
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# directory labeled dir_type.
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# This only allows the transition; it does not
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# cause it to occur automatically - use file_type_auto_trans
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# if that is what you want.
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#
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define(`file_type_trans', `
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# Allow the domain to add entries to the directory.
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allow $1 $2:dir ra_dir_perms;
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# Allow the domain to create the file.
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allow $1 $3:notdevfile_class_set create_file_perms;
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allow $1 $3:dir create_dir_perms;
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')
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#####################################
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# file_type_auto_trans(domain, dir_type, file_type)
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# Automatically label new files with file_type when
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# they are created by domain in directories labeled dir_type.
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#
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define(`file_type_auto_trans', `
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# Allow the necessary permissions.
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file_type_trans($1, $2, $3)
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# Make the transition occur by default.
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type_transition $1 $2:dir $3;
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type_transition $1 $2:notdevfile_class_set $3;
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')
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#####################################
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# r_dir_file(domain, type)
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# Allow the specified domain to read directories, files
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# and symbolic links of the specified type.
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define(`r_dir_file', `
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allow $1 $2:dir r_dir_perms;
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allow $1 $2:{ file lnk_file } r_file_perms;
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')
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#####################################
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# tmpfs_domain(domain)
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# Define and allow access to a unique type for
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# this domain when creating tmpfs / shmem / ashmem files.
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define(`tmpfs_domain', `
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type $1_tmpfs, file_type;
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type_transition $1 tmpfs:file $1_tmpfs;
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allow $1 $1_tmpfs:file { read write };
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')
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#####################################
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# init_daemon_domain(domain)
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# Set up a transition from init to the daemon domain
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# upon executing its binary.
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define(`init_daemon_domain', `
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domain_auto_trans(init, $1_exec, $1)
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tmpfs_domain($1)
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')
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#####################################
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# app_domain(domain)
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# Allow a base set of permissions required for all apps.
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define(`app_domain', `
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typeattribute $1 appdomain;
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# Label ashmem objects with our own unique type.
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tmpfs_domain($1)
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# Map with PROT_EXEC.
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allow $1 $1_tmpfs:file execute;
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')
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#####################################
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# net_domain(domain)
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# Allow a base set of permissions required for network access.
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define(`net_domain', `
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typeattribute $1 netdomain;
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')
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#####################################
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# bluetooth_domain(domain)
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# Allow a base set of permissions required for bluetooth access.
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define(`bluetooth_domain', `
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typeattribute $1 bluetoothdomain;
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')
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#####################################
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# unix_socket_connect(clientdomain, socket, serverdomain)
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# Allow a local socket connection from clientdomain via
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# socket to serverdomain.
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#
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# Note: If you see denial records that distill to the
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# following allow rules:
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# allow clientdomain property_socket:sock_file write;
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# allow clientdomain init:unix_stream_socket connectto;
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# allow clientdomain something_prop:property_service set;
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#
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# This sequence is indicative of attempting to set a property.
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# use set_prop(sourcedomain, targetproperty)
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#
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define(`unix_socket_connect', `
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ifelse($2, `property', `
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ifelse($3,`init', `
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print(`deprecated: unix_socket_connect($1, $2, $3) Please use set_prop($1, <property name>) instead.')
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')
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')
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__unix_socket_connect__($1, $2, $3)
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')
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define(`__unix_socket_connect__', `
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allow $1 $2_socket:sock_file write;
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allow $1 $3:unix_stream_socket connectto;
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')
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#####################################
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# set_prop(sourcedomain, targetproperty)
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# Allows source domain to set the
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# targetproperty.
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#
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define(`set_prop', `
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__unix_socket_connect__($1, property, init)
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allow $1 $2:property_service set;
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')
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#####################################
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# unix_socket_send(clientdomain, socket, serverdomain)
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# Allow a local socket send from clientdomain via
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# socket to serverdomain.
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define(`unix_socket_send', `
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allow $1 $2_socket:sock_file write;
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allow $1 $3:unix_dgram_socket sendto;
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')
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#####################################
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# binder_use(domain)
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# Allow domain to use Binder IPC.
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define(`binder_use', `
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# Call the servicemanager and transfer references to it.
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allow $1 servicemanager:binder { call transfer };
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# servicemanager performs getpidcon on clients.
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allow servicemanager $1:dir search;
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allow servicemanager $1:file { read open };
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allow servicemanager $1:process getattr;
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# rw access to /dev/binder and /dev/ashmem is presently granted to
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# all domains in domain.te.
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')
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#####################################
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# binder_call(clientdomain, serverdomain)
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# Allow clientdomain to perform binder IPC to serverdomain.
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define(`binder_call', `
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# Call the server domain and optionally transfer references to it.
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allow $1 $2:binder { call transfer };
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# Allow the serverdomain to transfer references to the client on the reply.
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allow $2 $1:binder transfer;
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# Receive and use open files from the server.
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allow $1 $2:fd use;
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')
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#####################################
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# binder_service(domain)
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# Mark a domain as being a Binder service domain.
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# Used to allow binder IPC to the various system services.
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define(`binder_service', `
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typeattribute $1 binderservicedomain;
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')
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#####################################
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# wakelock_use(domain)
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# Allow domain to manage wake locks
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define(`wakelock_use', `
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# Access /sys/power/wake_lock and /sys/power/wake_unlock
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allow $1 sysfs_wake_lock:file rw_file_perms;
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# Accessing these files requires CAP_BLOCK_SUSPEND
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allow $1 self:capability2 block_suspend;
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')
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#####################################
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# selinux_check_access(domain)
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# Allow domain to check SELinux permissions via selinuxfs.
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define(`selinux_check_access', `
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allow $1 selinuxfs:file rw_file_perms;
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allow $1 kernel:security compute_av;
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allow $1 self:netlink_selinux_socket *;
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')
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#####################################
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# selinux_check_context(domain)
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# Allow domain to check SELinux contexts via selinuxfs.
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define(`selinux_check_context', `
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allow $1 selinuxfs:file rw_file_perms;
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allow $1 kernel:security check_context;
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')
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#####################################
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# selinux_setenforce(domain)
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# Allow domain to set SELinux to enforcing.
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define(`selinux_setenforce', `
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allow $1 selinuxfs:file rw_file_perms;
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allow $1 kernel:security setenforce;
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')
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#####################################
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# selinux_setbool(domain)
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# Allow domain to set SELinux booleans.
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define(`selinux_setbool', `
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allow $1 selinuxfs:file rw_file_perms;
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allow $1 kernel:security setbool;
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')
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#####################################
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# security_access_policy(domain)
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# Read only access to all policy files and
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# selinuxfs
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define(`security_access_policy', `
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allow $1 security_file:dir r_dir_perms;
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allow $1 security_file:file r_file_perms;
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')
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#####################################
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# selinux_manage_policy(domain)
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# Ability to manage policy files and
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# trigger runtime reload.
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define(`selinux_manage_policy', `
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security_access_policy($1)
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allow $1 security_file:dir create_dir_perms;
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allow $1 security_file:file create_file_perms;
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allow $1 security_file:lnk_file { create rename unlink };
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set_prop($1, security_prop)
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')
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#####################################
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# mmac_manage_policy(domain)
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# Ability to manage mmac policy files,
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# trigger runtime reload, change
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# mmac enforcing mode and access logcat.
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define(`mmac_manage_policy', `
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allow $1 security_file:dir create_dir_perms;
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allow $1 security_file:file create_file_perms;
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allow $1 security_file:lnk_file { create rename unlink };
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set_prop($1, security_prop)
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')
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#####################################
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# access_kmsg(domain)
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# Ability to read from kernel logs
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# and execute the klogctl syscall
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# in a non destructive manner. See
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# man 2 klogctl
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define(`access_kmsg', `
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allow $1 kernel:system syslog_read;
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')
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#####################################
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# create_pty(domain)
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# Allow domain to create and use a pty, isolated from any other domain ptys.
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define(`create_pty', `
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# Each domain gets a unique devpts type.
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type $1_devpts, fs_type;
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# Label the pty with the unique type when created.
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type_transition $1 devpts:chr_file $1_devpts;
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# Allow use of the pty after creation.
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allow $1 $1_devpts:chr_file { open getattr read write ioctl };
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# Note: devpts:dir search and ptmx_device:chr_file rw_file_perms
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# allowed to everyone via domain.te.
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')
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#####################################
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# Non system_app application set
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#
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define(`non_system_app_set', `{ appdomain -system_app }')
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#####################################
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# Recovery only
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# SELinux rules which apply only to recovery mode
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#
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define(`recovery_only', ifelse(target_recovery, `true', $1, ))
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#####################################
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# Userdebug or eng builds
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# SELinux rules which apply only to userdebug or eng builds
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#
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define(`userdebug_or_eng', ifelse(target_build_variant, `eng', $1, ifelse(target_build_variant, `userdebug', $1)))
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#####################################
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# write_logd(domain)
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# Ability to write to android log
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# daemon via sockets
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define(`write_logd', `
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unix_socket_send($1, logdw, logd)
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allow $1 pmsg_device:chr_file w_file_perms;
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')
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#####################################
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# read_logd(domain)
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# Ability to run logcat and read from android
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# log daemon via sockets
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define(`read_logd', `
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allow $1 logcat_exec:file rx_file_perms;
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unix_socket_connect($1, logdr, logd)
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')
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#####################################
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# control_logd(domain)
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# Ability to control
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# android log daemon via sockets
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define(`control_logd', `
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# Group AID_LOG checked by filesystem & logd
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# to permit control commands
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unix_socket_connect($1, logd, logd)
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')
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#####################################
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# use_keystore(domain)
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# Ability to use keystore.
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# Keystore is requires the following permissions
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# to call getpidcon.
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define(`use_keystore', `
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allow keystore $1:dir search;
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allow keystore $1:file { read open };
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allow keystore $1:process getattr;
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allow $1 keystore_service:service_manager find;
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binder_call($1, keystore)
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')
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###########################################
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# use_drmservice(domain)
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# Ability to use DrmService which requires
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# DrmService to call getpidcon.
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define(`use_drmservice', `
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allow drmserver $1:dir search;
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allow drmserver $1:file { read open };
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allow drmserver $1:process getattr;
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')
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##########################################
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# print a message with a trailing newline
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# print(`args')
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define(`print', `errprint(`m4: '__file__: __line__`: $*
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')')
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