a3a0bb446b
(cherry picked from commit eb717421b1)
The new A/B OTA artifact naming scheme includes the target slot so
that the system is robust with respect to unexpected reboots. This
complicates the renaming code after reboot, so it is moved from the
zygote into a simple script (otapreopt_slot) that is hooked into
the startup sequence in init.
Give the script the subset of the rights that the zygote had so that
it can move the artifacts from /data/ota into /data/dalvik-cache.
Relabeling will be done in the init rc component, so relabeling
rights can be completely removed.
Bug: 25612095
Bug: 28069686
Change-Id: Iad56dc3d78ac759f4f2cce65633cdaf1cab7631b
107 lines
4.1 KiB
Text
107 lines
4.1 KiB
Text
# zygote
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type zygote, domain, domain_deprecated;
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type zygote_exec, exec_type, file_type;
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init_daemon_domain(zygote)
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typeattribute zygote mlstrustedsubject;
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# Override DAC on files and switch uid/gid.
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allow zygote self:capability { dac_override setgid setuid fowner chown };
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# Drop capabilities from bounding set.
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allow zygote self:capability setpcap;
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# Switch SELinux context to app domains.
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allow zygote self:process setcurrent;
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allow zygote system_server:process dyntransition;
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allow zygote { appdomain autoplay_app }:process dyntransition;
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# Allow zygote to read app /proc/pid dirs (b/10455872)
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allow zygote { appdomain autoplay_app }:dir { getattr search };
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allow zygote { appdomain autoplay_app }:file { r_file_perms };
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# Move children into the peer process group.
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allow zygote system_server:process { getpgid setpgid };
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allow zygote { appdomain autoplay_app }:process { getpgid setpgid };
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# Read system data.
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allow zygote system_data_file:dir r_dir_perms;
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allow zygote system_data_file:file r_file_perms;
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# Write to /data/dalvik-cache.
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allow zygote dalvikcache_data_file:dir create_dir_perms;
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allow zygote dalvikcache_data_file:file create_file_perms;
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# Create symlinks in /data/dalvik-cache
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allow zygote dalvikcache_data_file:lnk_file create_file_perms;
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# Write to /data/resource-cache
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allow zygote resourcecache_data_file:dir rw_dir_perms;
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allow zygote resourcecache_data_file:file create_file_perms;
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# For art.
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allow zygote dalvikcache_data_file:file execute;
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# Execute idmap and dex2oat within zygote's own domain.
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# TODO: Should either of these be transitioned to the same domain
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# used by installd or stay in-domain for zygote?
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allow zygote idmap_exec:file rx_file_perms;
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allow zygote dex2oat_exec:file rx_file_perms;
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# Control cgroups.
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allow zygote cgroup:dir create_dir_perms;
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allow zygote cgroup:{ file lnk_file } r_file_perms;
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allow zygote self:capability sys_admin;
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# Allow zygote to stat the files that it opens. The zygote must
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# be able to inspect them so that it can reopen them on fork
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# if necessary: b/30963384
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allow zygote pmsg_device:chr_file { getattr };
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allow zygote debugfs_trace_marker:file { getattr };
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# Check validity of SELinux context before use.
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selinux_check_context(zygote)
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# Check SELinux permissions.
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selinux_check_access(zygote)
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# Native bridge functionality requires that zygote replaces
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# /proc/cpuinfo with /system/lib/<ISA>/cpuinfo using a bind mount
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allow zygote proc_cpuinfo:file mounton;
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# Allow remounting rootfs as MS_SLAVE
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allow zygote rootfs:dir mounton;
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allow zygote tmpfs:filesystem { mount unmount };
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allow zygote fuse:filesystem { unmount };
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allow zygote sdcardfs:filesystem { unmount };
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# Allowed to create user-specific storage source if started before vold
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allow zygote mnt_user_file:dir create_dir_perms;
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allow zygote mnt_user_file:lnk_file create_file_perms;
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# Allowed to mount user-specific storage into place
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allow zygote storage_file:dir { search mounton };
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# Handle --invoke-with command when launching Zygote with a wrapper command.
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allow zygote zygote_exec:file rx_file_perms;
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# Read access to pseudo filesystems.
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r_dir_file(zygote, proc_net)
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# Root fs.
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r_dir_file(zygote, rootfs)
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# System file accesses.
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r_dir_file(zygote, system_file)
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userdebug_or_eng(`
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# Allow zygote to create and write method traces in /data/misc/trace.
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allow zygote method_trace_data_file:dir w_dir_perms;
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allow zygote method_trace_data_file:file { create w_file_perms };
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')
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allow zygote ion_device:chr_file r_file_perms;
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allow zygote tmpfs:dir r_dir_perms;
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###
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### neverallow rules
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###
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# Ensure that all types assigned to app processes are included
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# in the appdomain attribute, so that all allow and neverallow rules
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# written on appdomain are applied to all app processes.
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# This is achieved by ensuring that it is impossible for zygote to
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# setcon (dyntransition) to any types other than those associated
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# with appdomain plus system_server.
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neverallow zygote ~{ appdomain autoplay_app system_server }:process dyntransition;
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# Zygote should never execute anything from /data except for /data/dalvik-cache files.
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neverallow zygote {
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data_file_type
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-dalvikcache_data_file # map PROT_EXEC
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}:file no_x_file_perms;
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