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https://github.com/Divested-Mobile/DivestOS-Build.git
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54 lines
2.3 KiB
Diff
54 lines
2.3 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Chris Wailes <chriswailes@google.com>
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Date: Thu, 18 Apr 2019 18:25:57 -0700
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Subject: [PATCH] Adds additional sanitization for Zygote command arguments.
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Previously we were only insuring that the arguments provided to the
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Zygote didn't contain any newlines. This adds additional checks for
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carriage returns and standalone integer arguments to protect against
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malicious argument and packet injection respectively.
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Bug: 130164289
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Test: m & flash & boot & check logs
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Change-Id: I4055c50d52db0047c02c11096710fd07b429660c
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Merged-In: I4055c50d52db0047c02c11096710fd07b429660c
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(cherry picked from commit c99198249f8bb79487d4f9f0f45b5b2fefaba41a)
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---
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core/java/android/os/ZygoteProcess.java | 9 +++++++--
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1 file changed, 7 insertions(+), 2 deletions(-)
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diff --git a/core/java/android/os/ZygoteProcess.java b/core/java/android/os/ZygoteProcess.java
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index 7a13ee89d393..d3eb9ae05fe4 100644
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--- a/core/java/android/os/ZygoteProcess.java
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+++ b/core/java/android/os/ZygoteProcess.java
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@@ -16,6 +16,7 @@
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package android.os;
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+import android.annotation.NonNull;
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import android.net.LocalSocket;
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import android.net.LocalSocketAddress;
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import android.util.Log;
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@@ -253,15 +254,19 @@ public class ZygoteProcess {
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*/
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@GuardedBy("mLock")
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private static Process.ProcessStartResult zygoteSendArgsAndGetResult(
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- ZygoteState zygoteState, ArrayList<String> args)
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+ ZygoteState zygoteState, @NonNull ArrayList<String> args)
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throws ZygoteStartFailedEx {
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try {
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// Throw early if any of the arguments are malformed. This means we can
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// avoid writing a partial response to the zygote.
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int sz = args.size();
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for (int i = 0; i < sz; i++) {
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+ // Making two indexOf calls here is faster than running a manually fused loop due
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+ // to the fact that indexOf is a optimized intrinsic.
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if (args.get(i).indexOf('\n') >= 0) {
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- throw new ZygoteStartFailedEx("embedded newlines not allowed");
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+ throw new ZygoteStartFailedEx("Embedded newlines not allowed");
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+ } else if (args.get(i).indexOf('\r') >= 0) {
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+ throw new ZygoteStartFailedEx("Embedded carriage returns not allowed");
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}
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}
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