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https://github.com/Divested-Mobile/DivestOS-Build.git
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115 lines
4.2 KiB
Diff
115 lines
4.2 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Lin Lee <linlee@google.com>
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Date: Mon, 7 Aug 2023 09:34:41 +0000
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Subject: [PATCH] Fix Heap-use-after-free in MDnsSdListener::Monitor::run
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Use thread join to avoid thread exiting after instance
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recycled.
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Prior to implementing this patch, fuzzing would lead to a segmentation fault after approximately 500 rounds. With the addition of the patch, the fuzzing process can now be repeated for over 30,000 rounds.
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Test: m, fuzzing
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Fuzzing: mma mdns_service_fuzzer && adb sync data && adb shell /data/fuzz/arm64/mdns_service_fuzzer/mdns_service_fuzzer
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Bug: 272382770
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Ignore-AOSP-First: Security Issue
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(cherry picked from commit 9c0c15f80cffb98b36284dd169a2e62e059dbbe3)
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(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:75e5e2e1faec7aa2812fc6fba30d6fe80558bacd)
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Merged-In: I5bc85451b4e6539bad45ceb672924a37952cc138
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Change-Id: I5bc85451b4e6539bad45ceb672924a37952cc138
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---
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server/MDnsSdListener.cpp | 36 ++++++++++++++++++++++++------------
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server/MDnsSdListener.h | 4 +++-
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2 files changed, 27 insertions(+), 13 deletions(-)
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diff --git a/server/MDnsSdListener.cpp b/server/MDnsSdListener.cpp
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index ef53d249..6eaaf5c0 100644
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--- a/server/MDnsSdListener.cpp
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+++ b/server/MDnsSdListener.cpp
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@@ -27,6 +27,7 @@
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#include <sys/types.h>
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#include <string.h>
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#include <resolv.h>
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+#include <thread>
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#define LOG_TAG "MDnsDS"
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#define DBG 1
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@@ -524,10 +525,17 @@ MDnsSdListener::Monitor::Monitor() {
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socketpair(AF_LOCAL, SOCK_STREAM, 0, mCtrlSocketPair);
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pthread_mutex_init(&mHeadMutex, NULL);
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- const int rval = ::android::net::threadLaunch(this);
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- if (rval != 0) {
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- ALOGW("Error spawning monitor thread: %s (%d)", strerror(-rval), -rval);
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- }
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+ mRescanThread = new std::thread(&Monitor::run, this);
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+ if (!mRescanThread->joinable()) ALOGE("Unable to launch thread.");
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+}
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+
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+MDnsSdListener::Monitor::~Monitor() {
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+ if (VDBG) ALOGD("Monitor recycling");
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+ close(mCtrlSocketPair[1]); // interrupt poll in MDnsSdListener::Monitor::run() and revent will
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+ // be 17 = POLLIN | POLLHUP
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+ mRescanThread->join();
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+ delete mRescanThread;
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+ if (VDBG) ALOGD("Monitor recycled");
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}
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#define NAP_TIME 200 // 200 ms between polls
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@@ -617,14 +625,18 @@ void MDnsSdListener::Monitor::run() {
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}
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}
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if (VDBG) ALOGD("controlSocket shows revent= %d", mPollFds[0].revents);
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- switch (mPollFds[0].revents) {
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- case POLLIN: {
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- char readBuf[2];
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- read(mCtrlSocketPair[0], &readBuf, 1);
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- if (DBG) ALOGD("MDnsSdListener::Monitor got %c", readBuf[0]);
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- if (memcmp(RESCAN, readBuf, 1) == 0) {
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- pollCount = rescan();
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- }
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+ if (mPollFds[0].revents & POLLHUP) {
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+ free(mPollFds);
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+ free(mPollRefs);
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+ if (VDBG) ALOGD("Monitor thread leaving.");
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+ return;
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+ }
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+ if (mPollFds[0].revents == POLLIN) {
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+ char readBuf[2];
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+ read(mCtrlSocketPair[0], &readBuf, 1);
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+ if (DBG) ALOGD("MDnsSdListener::Monitor got %c", readBuf[0]);
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+ if (memcmp(RESCAN, readBuf, 1) == 0) {
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+ pollCount = rescan();
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}
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}
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mPollFds[0].revents = 0;
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diff --git a/server/MDnsSdListener.h b/server/MDnsSdListener.h
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index 8c6096e8..2b3cb5e2 100644
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--- a/server/MDnsSdListener.h
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+++ b/server/MDnsSdListener.h
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@@ -20,6 +20,7 @@
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#include <pthread.h>
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#include <sysutils/FrameworkListener.h>
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#include <dns_sd.h>
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+#include <thread>
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#include "NetdCommand.h"
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@@ -71,7 +72,7 @@ private:
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class Monitor {
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public:
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Monitor();
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- virtual ~Monitor() {}
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+ ~Monitor();
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DNSServiceRef *allocateServiceRef(int id, Context *c);
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void startMonitoring(int id);
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DNSServiceRef *lookupServiceRef(int id);
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@@ -101,6 +102,7 @@ private:
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int mPollSize;
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int mCtrlSocketPair[2];
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pthread_mutex_t mHeadMutex;
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+ std::thread* mRescanThread;
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};
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class Handler : public NetdCommand {
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