platform_system_core/logd/README.property
Sami Tolvanen d122ee65b6 logd: enforce policy integrity
If a SELinux policy change or a switch to permissive mode is detected
on a user build, restart the device into safe mode, and keep it there
until an OTA is applied or user data is wiped.

This change deprecates the ro.logd.auditd property.

Needs matching changes from
  I781c3059ea8d4fb2f0c923e4488b1932d69678d3
  Ica825cf2af74f5624cf4091544bd24bb5482dbe7
  Id3ca7889ede30b54b7af73dd50653ca1a20d59aa

Bug: 26902605
Change-Id: Idcdc5bff133f13c1267f0ec0a75cc8cf1ddbda0d
2016-02-16 12:54:54 -08:00

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The properties that logd responds to are:
name type default description
ro.logd.auditd.dmesg bool true selinux audit messages duplicated and
sent on to dmesg log
persist.logd.security bool false Enable security buffer.
ro.device_owner bool false Override persist.logd.security to false
ro.logd.kernel bool+ svelte+ Enable klogd daemon
ro.logd.statistics bool+ svelte+ Enable logcat -S statistics.
ro.debuggable number if not "1", logd.statistics &
ro.logd.kernel default false.
persist.logd.logpersistd string Enable logpersist daemon, "logcatd"
turns on logcat -f in logd context
persist.logd.size number ro Global default size of the buffer for
all log ids at initial startup, at
runtime use: logcat -b all -G <value>
ro.logd.size number svelte default for persist.logd.size. Larger
platform default sizes than 256KB are
known to not scale well under log spam
pressure. Address the spam first,
resist increasing the log buffer.
persist.logd.size.<buffer> number ro Size of the buffer for <buffer> log
ro.logd.size.<buffer> number svelte default for persist.logd.size.<buffer>
ro.config.low_ram bool false if true, logd.statistics, logd.kernel
default false, logd.size 64K instead
of 256K.
persist.logd.filter string Pruning filter to optimize content.
At runtime use: logcat -P "<string>"
ro.logd.filter string "~! ~1000/!" default for persist.logd.filter.
This default means to prune the
oldest entries of chattiest UID, and
the chattiest PID of system
(1000, or AID_SYSTEM).
persist.logd.timestamp string ro The recording timestamp source.
"m[onotonic]" is the only supported
key character, otherwise realtime.
ro.logd.timestamp string realtime default for persist.logd.timestamp
log.tag string persist The global logging level, VERBOSE,
DEBUG, INFO, WARN, ERROR, ASSERT or
SILENT. Only the first character is
the key character.
persist.log.tag string build default for log.tag
log.tag.<tag> string persist The <tag> specific logging level.
persist.log.tag.<tag> string build default for log.tag.<tag>
NB:
- bool+ - "true", "false" and comma separated list of "eng" (forced false if
ro.debuggable is not "1") or "svelte" (forced false if ro.config.low_ram is
true).
- svelte - see ro.config.low_ram for details.
- svelte+ - see ro.config.low_ram and ro.debuggable for details.
- ro - <base property> temporary override, ro.<base property> platform default.
- persist - <base property> override, persist.<base property> platform default.
- build - VERBOSE for native, DEBUG for jvm isLoggable, or developer option.
- number - support multipliers (K or M) for convenience. Range is limited
to between 64K and 256M for log buffer sizes. Individual log buffer ids
such as main, system, ... override global default.
- Pruning filter is of form of a space-separated list of [~][UID][/PID]
references, where '~' prefix means to blacklist otherwise whitelist. For
blacklisting, UID or PID may be a '!' to instead reference the chattiest
client, with the restriction that the PID must be in the UID group 1000
(system or AID_SYSTEM).