Merge cherrypicks of [4195647, 4186616, 4186617, 4186167, 4186168, 4186582, 4195648, 4195649, 4195818, 4195819, 4195820, 4195821, 4195858, 4195650, 4195577, 4195859, 4195860, 4195861, 4195862, 4195863, 4195864, 4195865, 4195525, 4195526, 4195527, 4195528, 4195529, 4195530, 4195531, 4195532, 4195533, 4195534, 4195535, 4195536, 4186409, 4186410, 4186411, 4195537, 4195880, 4195881, 4195822, 4195898, 4195866, 4195652, 4195653, 4195582, 4195583, 4195584, 4195585, 4195586, 4195587, 4195588, 4195589, 4195590, 4195591, 4195592, 4195593, 4195594, 4195595, 4195654, 4186583, 4195882, 4195628, 4195629, 4195630, 4195655] into sparse-4732991-L55400000176809537
Change-Id: Id6ec552672458e614508b68b01c40f21202c7595
diff --git a/libs/binder/Parcel.cpp b/libs/binder/Parcel.cpp
index e22179b..460bbe2 100644
--- a/libs/binder/Parcel.cpp
+++ b/libs/binder/Parcel.cpp
@@ -433,6 +433,7 @@
mDataPos = pos;
mNextObjectHint = 0;
+ mObjectsSorted = false;
}
status_t Parcel::setDataCapacity(size_t size)
@@ -1276,7 +1277,7 @@
if (err) return err;
// payload
- void* const buf = this->writeInplace(pad_size(len));
+ void* const buf = this->writeInplace(len);
if (buf == NULL)
return BAD_VALUE;
@@ -1469,6 +1470,59 @@
LOG_ALWAYS_FATAL("Parcel::remove() not yet implemented!");
}
+status_t Parcel::validateReadData(size_t upperBound) const
+{
+ // Don't allow non-object reads on object data
+ if (mObjectsSorted || mObjectsSize <= 1) {
+data_sorted:
+ // Expect to check only against the next object
+ if (mNextObjectHint < mObjectsSize && upperBound > mObjects[mNextObjectHint]) {
+ // For some reason the current read position is greater than the next object
+ // hint. Iterate until we find the right object
+ size_t nextObject = mNextObjectHint;
+ do {
+ if (mDataPos < mObjects[nextObject] + sizeof(flat_binder_object)) {
+ // Requested info overlaps with an object
+ ALOGE("Attempt to read from protected data in Parcel %p", this);
+ return PERMISSION_DENIED;
+ }
+ nextObject++;
+ } while (nextObject < mObjectsSize && upperBound > mObjects[nextObject]);
+ mNextObjectHint = nextObject;
+ }
+ return NO_ERROR;
+ }
+ // Quickly determine if mObjects is sorted.
+ binder_size_t* currObj = mObjects + mObjectsSize - 1;
+ binder_size_t* prevObj = currObj;
+ while (currObj > mObjects) {
+ prevObj--;
+ if(*prevObj > *currObj) {
+ goto data_unsorted;
+ }
+ currObj--;
+ }
+ mObjectsSorted = true;
+ goto data_sorted;
+
+data_unsorted:
+ // Insertion Sort mObjects
+ // Great for mostly sorted lists. If randomly sorted or reverse ordered mObjects become common,
+ // switch to std::sort(mObjects, mObjects + mObjectsSize);
+ for (binder_size_t* iter0 = mObjects + 1; iter0 < mObjects + mObjectsSize; iter0++) {
+ binder_size_t temp = *iter0;
+ binder_size_t* iter1 = iter0 - 1;
+ while (iter1 >= mObjects && *iter1 > temp) {
+ *(iter1 + 1) = *iter1;
+ iter1--;
+ }
+ *(iter1 + 1) = temp;
+ }
+ mNextObjectHint = 0;
+ mObjectsSorted = true;
+ goto data_sorted;
+}
+
status_t Parcel::read(void* outData, size_t len) const
{
if (len > INT32_MAX) {
@@ -1479,6 +1533,15 @@
if ((mDataPos+pad_size(len)) >= mDataPos && (mDataPos+pad_size(len)) <= mDataSize
&& len <= pad_size(len)) {
+ if (mObjectsSize > 0) {
+ status_t err = validateReadData(mDataPos + pad_size(len));
+ if(err != NO_ERROR) {
+ // Still increment the data position by the expected length
+ mDataPos += pad_size(len);
+ ALOGV("read Setting data pos of %p to %zu", this, mDataPos);
+ return err;
+ }
+ }
memcpy(outData, mData+mDataPos, len);
mDataPos += pad_size(len);
ALOGV("read Setting data pos of %p to %zu", this, mDataPos);
@@ -1497,6 +1560,16 @@
if ((mDataPos+pad_size(len)) >= mDataPos && (mDataPos+pad_size(len)) <= mDataSize
&& len <= pad_size(len)) {
+ if (mObjectsSize > 0) {
+ status_t err = validateReadData(mDataPos + pad_size(len));
+ if(err != NO_ERROR) {
+ // Still increment the data position by the expected length
+ mDataPos += pad_size(len);
+ ALOGV("readInplace Setting data pos of %p to %zu", this, mDataPos);
+ return NULL;
+ }
+ }
+
const void* data = mData+mDataPos;
mDataPos += pad_size(len);
ALOGV("readInplace Setting data pos of %p to %zu", this, mDataPos);
@@ -1510,6 +1583,15 @@
COMPILE_TIME_ASSERT_FUNCTION_SCOPE(PAD_SIZE_UNSAFE(sizeof(T)) == sizeof(T));
if ((mDataPos+sizeof(T)) <= mDataSize) {
+ if (mObjectsSize > 0) {
+ status_t err = validateReadData(mDataPos + sizeof(T));
+ if(err != NO_ERROR) {
+ // Still increment the data position by the expected length
+ mDataPos += sizeof(T);
+ return err;
+ }
+ }
+
const void* data = mData+mDataPos;
mDataPos += sizeof(T);
*pArg = *reinterpret_cast<const T*>(data);
@@ -2366,6 +2448,7 @@
mObjects = const_cast<binder_size_t*>(objects);
mObjectsSize = mObjectsCapacity = objectsCount;
mNextObjectHint = 0;
+ mObjectsSorted = false;
mOwner = relFunc;
mOwnerCookie = relCookie;
for (size_t i = 0; i < mObjectsSize; i++) {
@@ -2524,6 +2607,7 @@
mObjects = NULL;
mObjectsSize = mObjectsCapacity = 0;
mNextObjectHint = 0;
+ mObjectsSorted = false;
mHasFds = false;
mFdsKnown = true;
mAllowFds = true;
@@ -2610,6 +2694,7 @@
mDataCapacity = desired;
mObjectsSize = mObjectsCapacity = objectsSize;
mNextObjectHint = 0;
+ mObjectsSorted = false;
} else if (mData) {
if (objectsSize < mObjectsSize) {
@@ -2631,6 +2716,7 @@
}
mObjectsSize = objectsSize;
mNextObjectHint = 0;
+ mObjectsSorted = false;
}
// We own the data, so we can just do a realloc().
@@ -2703,6 +2789,7 @@
mObjectsSize = 0;
mObjectsCapacity = 0;
mNextObjectHint = 0;
+ mObjectsSorted = false;
mHasFds = false;
mFdsKnown = true;
mAllowFds = true;
diff --git a/libs/binder/include/binder/Parcel.h b/libs/binder/include/binder/Parcel.h
index 5d36526..dede78f 100644
--- a/libs/binder/include/binder/Parcel.h
+++ b/libs/binder/include/binder/Parcel.h
@@ -417,6 +417,7 @@
void freeDataNoInit();
void initState();
void scanForFds() const;
+ status_t validateReadData(size_t len) const;
template<class T>
status_t readAligned(T *pArg) const;
@@ -463,6 +464,7 @@
size_t mObjectsSize;
size_t mObjectsCapacity;
mutable size_t mNextObjectHint;
+ mutable bool mObjectsSorted;
mutable bool mFdsKnown;
mutable bool mHasFds;
