4397f08288
Kernel commit 3ba4bf5f1e2c ("selinux: add a map permission check for mmap")
added a map permission check on mmap so that we can
distinguish memory mapped access (since it has different implications
for revocation). The purpose of a separate map permission check on
mmap(2) is to permit policy to prohibit memory mapping of specific files
for which we need to ensure that every access is revalidated, particularly
useful for scenarios where we expect the file to be relabeled at runtime
in order to reflect state changes (e.g. cross-domain solution, assured
pipeline without data copying). The kernel commit is anticipated to
be included in Linux 4.13.
This change defines map permission for the Android policy. It mirrors
the definition in the kernel classmap by adding it to the common
definitions for files and sockets. This will break compatibility for
kernels that predate the dynamic class/perm mapping support (< 2.6.33);
on such kernels, one would instead need to add map permission
to the end of each file and socket access vector.
This change also adds map permission to the global macro definitions for
file permissions, thereby allowing it in any allow rule that uses these
macros, and to specific rules allowing mapping of files from /system
and executable types. This should cover most cases where it is needed,
although it may still need to be added to specific allow rules when the
global macros are not used.
Test: Policy builds
Change-Id: Iab3ccd2b6587618e68ecab58218838749fe5e7f5
Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>
48 lines
3.2 KiB
Text
48 lines
3.2 KiB
Text
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# Common groupings of object classes.
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#
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define(`capability_class_set', `{ capability capability2 }')
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define(`devfile_class_set', `{ chr_file blk_file }')
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define(`notdevfile_class_set', `{ file lnk_file sock_file fifo_file }')
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define(`file_class_set', `{ devfile_class_set notdevfile_class_set }')
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define(`dir_file_class_set', `{ dir file_class_set }')
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define(`socket_class_set', `{ socket tcp_socket udp_socket rawip_socket netlink_socket packet_socket key_socket unix_stream_socket unix_dgram_socket appletalk_socket netlink_route_socket netlink_tcpdiag_socket netlink_nflog_socket netlink_xfrm_socket netlink_selinux_socket netlink_audit_socket netlink_dnrt_socket netlink_kobject_uevent_socket tun_socket netlink_iscsi_socket netlink_fib_lookup_socket netlink_connector_socket netlink_netfilter_socket netlink_generic_socket netlink_scsitransport_socket netlink_rdma_socket netlink_crypto_socket sctp_socket icmp_socket ax25_socket ipx_socket netrom_socket atmpvc_socket x25_socket rose_socket decnet_socket atmsvc_socket rds_socket irda_socket pppox_socket llc_socket can_socket tipc_socket bluetooth_socket iucv_socket rxrpc_socket isdn_socket phonet_socket ieee802154_socket caif_socket alg_socket nfc_socket vsock_socket kcm_socket qipcrtr_socket smc_socket }')
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define(`dgram_socket_class_set', `{ udp_socket unix_dgram_socket }')
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define(`stream_socket_class_set', `{ tcp_socket unix_stream_socket }')
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define(`unpriv_socket_class_set', `{ tcp_socket udp_socket unix_stream_socket unix_dgram_socket }')
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define(`ipc_class_set', `{ sem msgq shm ipc }')
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#####################################
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# Common groupings of permissions.
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#
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define(`x_file_perms', `{ getattr execute execute_no_trans map }')
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define(`r_file_perms', `{ getattr open read ioctl lock map }')
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define(`w_file_perms', `{ open append write lock map }')
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define(`rx_file_perms', `{ r_file_perms x_file_perms }')
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define(`ra_file_perms', `{ r_file_perms append }')
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define(`rw_file_perms', `{ r_file_perms w_file_perms }')
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define(`rwx_file_perms', `{ rw_file_perms x_file_perms }')
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define(`create_file_perms', `{ create rename setattr unlink rw_file_perms }')
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define(`r_dir_perms', `{ open getattr read search ioctl lock }')
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define(`w_dir_perms', `{ open search write add_name remove_name lock }')
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define(`ra_dir_perms', `{ r_dir_perms add_name write }')
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define(`rw_dir_perms', `{ r_dir_perms w_dir_perms }')
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define(`create_dir_perms', `{ create reparent rename rmdir setattr rw_dir_perms }')
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define(`r_ipc_perms', `{ getattr read associate unix_read }')
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define(`w_ipc_perms', `{ write unix_write }')
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define(`rw_ipc_perms', `{ r_ipc_perms w_ipc_perms }')
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define(`create_ipc_perms', `{ create setattr destroy rw_ipc_perms }')
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#####################################
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# Common socket permission sets.
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define(`rw_socket_perms', `{ ioctl read getattr write setattr lock append bind connect getopt setopt shutdown }')
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define(`rw_socket_perms_no_ioctl', `{ read getattr write setattr lock append bind connect getopt setopt shutdown }')
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define(`create_socket_perms', `{ create rw_socket_perms }')
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define(`create_socket_perms_no_ioctl', `{ create rw_socket_perms_no_ioctl }')
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define(`rw_stream_socket_perms', `{ rw_socket_perms listen accept }')
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define(`create_stream_socket_perms', `{ create rw_stream_socket_perms }')
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