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Merge "Fix two StrictMode stack collection bugs."

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This commit is contained in:
TreeHugger Robot
2016-12-07 08:21:38 +00:00
committed by Android (Google) Code Review
parent dc46397a44 58f27b5033
commit 82ddb5e118
2 changed files with 38 additions and 47 deletions
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5
core/java/android/app/ApplicationErrorReport.java
View File

@@ -378,6 +378,11 @@ public class ApplicationErrorReport implements Parcelable {
exceptionMessage = sanitizeString(exceptionMessage);
}
/** {@hide} */
public void appendStackTrace(String tr) {
stackTrace = sanitizeString(stackTrace + tr);
}
/**
* Ensure that the string is of reasonable size, truncating from the middle if needed.
*/

80
core/java/android/os/StrictMode.java
View File

@@ -1474,9 +1474,6 @@ public final class StrictMode {
if (violations == null) {
violations = new ArrayList<ViolationInfo>(1);
gatheredViolations.set(violations);
} else if (violations.size() >= 5) {
// Too many. In a loop or something? Don't gather them all.
return;
}
for (ViolationInfo previous : violations) {
if (info.crashInfo.stackTrace.equals(previous.crashInfo.stackTrace)) {
@@ -1990,18 +1987,14 @@ public final class StrictMode {
if (violations == null) {
p.writeInt(0);
} else {
p.writeInt(violations.size());
for (int i = 0; i < violations.size(); ++i) {
int start = p.dataPosition();
violations.get(i).writeToParcel(p, 0 /* unused flags? */);
int size = p.dataPosition()-start;
if (size > 10*1024) {
Slog.d(TAG, "Wrote violation #" + i + " of " + violations.size() + ": "
+ (p.dataPosition()-start) + " bytes");
}
// To avoid taking up too much transaction space, only include
// details for the first 3 violations. Deep inside, CrashInfo
// will truncate each stack trace to ~20kB.
final int size = Math.min(violations.size(), 3);
p.writeInt(size);
for (int i = 0; i < size; i++) {
violations.get(i).writeToParcel(p, 0);
}
if (LOG_V) Log.d(TAG, "wrote violations to response parcel; num=" + violations.size());
violations.clear(); // somewhat redundant, as we're about to null the threadlocal
}
gatheredViolations.set(null);
}
@@ -2015,40 +2008,19 @@ public final class StrictMode {
/* package */ static void readAndHandleBinderCallViolations(Parcel p) {
// Our own stack trace to append
StringWriter sw = new StringWriter();
sw.append("# via Binder call with stack:\n");
PrintWriter pw = new FastPrintWriter(sw, false, 256);
new LogStackTrace().printStackTrace(pw);
pw.flush();
String ourStack = sw.toString();
int policyMask = getThreadPolicyMask();
boolean currentlyGathering = (policyMask & PENALTY_GATHER) != 0;
final int policyMask = getThreadPolicyMask();
final boolean currentlyGathering = (policyMask & PENALTY_GATHER) != 0;
int numViolations = p.readInt();
for (int i = 0; i < numViolations; ++i) {
if (LOG_V) Log.d(TAG, "strict mode violation stacks read from binder call. i=" + i);
ViolationInfo info = new ViolationInfo(p, !currentlyGathering);
if (info.crashInfo.stackTrace != null && info.crashInfo.stackTrace.length() > 30000) {
String front = info.crashInfo.stackTrace.substring(0, 256);
// 30000 characters is way too large for this to be any sane kind of
// strict mode collection of stacks. We've had a problem where we leave
// strict mode violations associated with the thread, and it keeps tacking
// more and more stacks on to the violations. Looks like we're in this casse,
// so we'll report it and bail on all of the current strict mode violations
// we currently are maintaining for this thread.
// First, drain the remaining violations from the parcel.
i++; // Skip the current entry.
for (; i < numViolations; i++) {
info = new ViolationInfo(p, !currentlyGathering);
}
// Next clear out all gathered violations.
clearGatheredViolations();
// Now report the problem.
Slog.wtfStack(TAG, "Stack is too large: numViolations=" + numViolations
+ " policy=#" + Integer.toHexString(policyMask)
+ " front=" + front);
return;
}
info.crashInfo.stackTrace += "# via Binder call with stack:\n" + ourStack;
final int size = p.readInt();
for (int i = 0; i < size; i++) {
final ViolationInfo info = new ViolationInfo(p, !currentlyGathering);
info.crashInfo.appendStackTrace(ourStack);
BlockGuard.Policy policy = BlockGuard.getThreadPolicy();
if (policy instanceof AndroidBlockGuardPolicy) {
((AndroidBlockGuardPolicy) policy).handleViolationWithTimingAttempt(info);
@@ -2391,7 +2363,7 @@ public final class StrictMode {
* @hide
*/
public static class ViolationInfo implements Parcelable {
public String message;
public final String message;
/**
* Stack and other stuff info.
@@ -2450,6 +2422,7 @@ public final class StrictMode {
* Create an uninitialized instance of ViolationInfo
*/
public ViolationInfo() {
message = null;
crashInfo = null;
policy = 0;
}
@@ -2496,7 +2469,9 @@ public final class StrictMode {
@Override
public int hashCode() {
int result = 17;
result = 37 * result + crashInfo.stackTrace.hashCode();
if (crashInfo != null) {
result = 37 * result + crashInfo.stackTrace.hashCode();
}
if (numAnimationsRunning != 0) {
result *= 37;
}
@@ -2526,7 +2501,11 @@ public final class StrictMode {
*/
public ViolationInfo(Parcel in, boolean unsetGatheringBit) {
message = in.readString();
crashInfo = new ApplicationErrorReport.CrashInfo(in);
if (in.readInt() != 0) {
crashInfo = new ApplicationErrorReport.CrashInfo(in);
} else {
crashInfo = null;
}
int rawPolicy = in.readInt();
if (unsetGatheringBit) {
policy = rawPolicy & ~PENALTY_GATHER;
@@ -2548,7 +2527,12 @@ public final class StrictMode {
@Override
public void writeToParcel(Parcel dest, int flags) {
dest.writeString(message);
crashInfo.writeToParcel(dest, flags);
if (crashInfo != null) {
dest.writeInt(1);
crashInfo.writeToParcel(dest, flags);
} else {
dest.writeInt(0);
}
int start = dest.dataPosition();
dest.writeInt(policy);
dest.writeInt(durationMillis);
@@ -2576,7 +2560,9 @@ public final class StrictMode {
* Dump a ViolationInfo instance to a Printer.
*/
public void dump(Printer pw, String prefix) {
crashInfo.dump(pw, prefix);
if (crashInfo != null) {
crashInfo.dump(pw, prefix);
}
pw.println(prefix + "policy: " + policy);
if (durationMillis != -1) {
pw.println(prefix + "durationMillis: " + durationMillis);