37daf9f48e
As a result of commit f8a00cef17206ecd1b30d3d9f99e10d9fa707aa7
("proc: restrict kernel stack dumps to root")
the userdebug feature where llkd can monitor for live lock
signatures in the stack traces broke.
So now userdebug variant of llkd requires sys_admin permissions.
Signed-off-by: Mark Salyzyn <salyzyn@google.com>
Test: llkd_unit_test
Bug: 147486902
Change-Id: I31572afa08daa490a69783855bce55313eaed96c
53 lines
1.5 KiB
Text
53 lines
1.5 KiB
Text
# llkd Live LocK Daemon
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typeattribute llkd coredomain;
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init_daemon_domain(llkd)
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get_prop(llkd, llkd_prop)
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allow llkd self:global_capability_class_set kill;
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userdebug_or_eng(`
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allow llkd self:global_capability_class_set { sys_ptrace sys_admin };
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allow llkd self:global_capability_class_set { dac_override dac_read_search };
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')
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# llkd optionally locks itself in memory, to prevent it from being
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# swapped out and unable to discover a kernel in live-lock state.
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allow llkd self:global_capability_class_set ipc_lock;
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# Send kill signals to _anyone_ suffering from Live Lock
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allow llkd domain:process sigkill;
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# read stack to check for Live Lock
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userdebug_or_eng(`
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allow llkd {
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domain
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-apexd
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-kernel
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-keystore
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-init
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-llkd
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-ueventd
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-vendor_init
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}:process ptrace;
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')
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# live lock watchdog process allowed to look through /proc/
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allow llkd domain:dir r_dir_perms;
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allow llkd domain:file r_file_perms;
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allow llkd domain:lnk_file read;
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# Set /proc/sys/kernel/hung_task_*
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allow llkd proc_hung_task:file rw_file_perms;
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# live lock watchdog process allowed to dump process trace and
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# reboot because orderly shutdown may not be possible.
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allow llkd proc_sysrq:file w_file_perms;
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allow llkd kmsg_device:chr_file w_file_perms;
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### neverallow rules
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neverallow { domain -init } llkd:process { dyntransition transition };
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neverallow { domain userdebug_or_eng(`-crash_dump') } llkd:process ptrace;
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# never honor LD_PRELOAD
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neverallow * llkd:process noatsecure;
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