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logd: don't coalesce identical log messages in the security buffer

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This buffer isn't human readable and the parsers aren't set up to
handle the 'chatty' message for identical log messages.  Further, it
is a low volume buffer so there's not much in terms of memory saving
if this were enabled.

Bug: 137093665
Test: security unit tests
Change-Id: I03fce518d3308a6d9240bd29e83ff3237203fe3b
This commit is contained in:
Tom Cherry 2020-02-20 13:21:51 -08:00
parent e53f8b8f9d
commit 2ac86de15a
1 changed files with 30 additions and 24 deletions
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54
logd/LogBuffer.cpp
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@ -207,31 +207,37 @@ int LogBuffer::log(log_id_t log_id, log_time realtime, uid_t uid, pid_t pid,
// exact entry with time specified in ms or us precision.
if ((realtime.tv_nsec % 1000) == 0) ++realtime.tv_nsec;
LogBufferElement* elem =
new LogBufferElement(log_id, realtime, uid, pid, tid, msg, len);
if (log_id != LOG_ID_SECURITY) {
int prio = ANDROID_LOG_INFO;
const char* tag = nullptr;
size_t tag_len = 0;
if (log_id == LOG_ID_EVENTS || log_id == LOG_ID_STATS) {
tag = tagToName(elem->getTag());
if (tag) {
tag_len = strlen(tag);
}
} else {
prio = *msg;
tag = msg + 1;
tag_len = strnlen(tag, len - 1);
}
if (!__android_log_is_loggable_len(prio, tag, tag_len,
ANDROID_LOG_VERBOSE)) {
// Log traffic received to total
wrlock();
stats.addTotal(elem);
unlock();
delete elem;
return -EACCES;
LogBufferElement* elem = new LogBufferElement(log_id, realtime, uid, pid, tid, msg, len);
// b/137093665: don't coalesce security messages.
if (log_id == LOG_ID_SECURITY) {
wrlock();
log(elem);
unlock();
return len;
}
int prio = ANDROID_LOG_INFO;
const char* tag = nullptr;
size_t tag_len = 0;
if (log_id == LOG_ID_EVENTS || log_id == LOG_ID_STATS) {
tag = tagToName(elem->getTag());
if (tag) {
tag_len = strlen(tag);
}
} else {
prio = *msg;
tag = msg + 1;
tag_len = strnlen(tag, len - 1);
}
if (!__android_log_is_loggable_len(prio, tag, tag_len, ANDROID_LOG_VERBOSE)) {
// Log traffic received to total
wrlock();
stats.addTotal(elem);
unlock();
delete elem;
return -EACCES;
}
wrlock();