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-rw-r--r--libs/binder/Parcel.cpp31
-rw-r--r--libs/binder/include/binder/Parcel.h24
2 files changed, 44 insertions, 11 deletions
diff --git a/libs/binder/Parcel.cpp b/libs/binder/Parcel.cpp
index 9bba369ee4..8087443720 100644
--- a/libs/binder/Parcel.cpp
+++ b/libs/binder/Parcel.cpp
@@ -1477,6 +1477,31 @@ data_unsorted:
goto data_sorted;
}
+status_t Parcel::readVectorSizeWithCoarseBoundCheck(int32_t *size) const {
+ int32_t requestedSize;
+ const status_t status = readInt32(&requestedSize);
+ if (status != NO_ERROR) return status;
+
+ // We permit negative sizes, which indicate presence of a nullable vector,
+ // i.e. a vector embedded in std::optional, std::unique_ptr, or std::shared_ptr.
+ if (requestedSize > 0) {
+ // Check if there are fewer bytes than vector elements.
+ // A lower bound is 1 byte per element, satisfied by some enum and int8_t and uint8_t.
+ const size_t availableBytes = dataAvail();
+ if (static_cast<size_t>(requestedSize) > availableBytes) {
+ // We have a size that is greater than the number of bytes available.
+ // On bounds failure we do not 'rewind' position by 4 bytes of the size already read.
+ ALOGW("%s: rejecting out of bounds vector size (requestedSize):%d "
+ "Parcel{dataAvail:%zu mDataSize:%zu mDataPos:%zu mDataCapacity:%zu}",
+ __func__, requestedSize, availableBytes, mDataSize, mDataPos, mDataCapacity);
+ return BAD_VALUE;
+ }
+ }
+
+ *size = requestedSize;
+ return NO_ERROR;
+}
+
status_t Parcel::read(void* outData, size_t len) const
{
if (len > INT32_MAX) {
@@ -1699,7 +1724,7 @@ status_t Parcel::readDoubleVector(std::vector<double>* val) const {
status_t Parcel::readBoolVector(std::optional<std::vector<bool>>* val) const {
const int32_t start = dataPosition();
int32_t size;
- status_t status = readInt32(&size);
+ status_t status = readVectorSizeWithCoarseBoundCheck(&size);
val->reset();
if (status != OK || size < 0) {
@@ -1721,7 +1746,7 @@ status_t Parcel::readBoolVector(std::optional<std::vector<bool>>* val) const {
status_t Parcel::readBoolVector(std::unique_ptr<std::vector<bool>>* val) const {
const int32_t start = dataPosition();
int32_t size;
- status_t status = readInt32(&size);
+ status_t status = readVectorSizeWithCoarseBoundCheck(&size);
val->reset();
if (status != OK || size < 0) {
@@ -1742,7 +1767,7 @@ status_t Parcel::readBoolVector(std::unique_ptr<std::vector<bool>>* val) const {
status_t Parcel::readBoolVector(std::vector<bool>* val) const {
int32_t size;
- status_t status = readInt32(&size);
+ status_t status = readVectorSizeWithCoarseBoundCheck(&size);
if (status != OK) {
return status;
diff --git a/libs/binder/include/binder/Parcel.h b/libs/binder/include/binder/Parcel.h
index b49951b448..54c49e4c0c 100644
--- a/libs/binder/include/binder/Parcel.h
+++ b/libs/binder/include/binder/Parcel.h
@@ -517,6 +517,11 @@ private:
void initState();
void scanForFds() const;
status_t validateReadData(size_t len) const;
+
+ // Reads an int32 size and does a coarse bounds check against the number
+ // of available bytes in the Parcel.
+ status_t readVectorSizeWithCoarseBoundCheck(int32_t *size) const;
+
void updateWorkSourceRequestHeaderPosition() const;
status_t finishFlattenBinder(const sp<IBinder>& binder);
@@ -787,6 +792,7 @@ status_t Parcel::writeVectorSize(const std::unique_ptr<std::vector<T>>& val) {
template<typename T>
status_t Parcel::resizeOutVector(std::vector<T>* val) const {
int32_t size;
+ // used for allocating 'out' vector args, do not use readVectorSizeWithCoarseBoundCheck() here
status_t err = readInt32(&size);
if (err != NO_ERROR) {
return err;
@@ -802,6 +808,7 @@ status_t Parcel::resizeOutVector(std::vector<T>* val) const {
template<typename T>
status_t Parcel::resizeOutVector(std::optional<std::vector<T>>* val) const {
int32_t size;
+ // used for allocating 'out' vector args, do not use readVectorSizeWithCoarseBoundCheck() here
status_t err = readInt32(&size);
if (err != NO_ERROR) {
return err;
@@ -818,6 +825,7 @@ status_t Parcel::resizeOutVector(std::optional<std::vector<T>>* val) const {
template<typename T>
status_t Parcel::resizeOutVector(std::unique_ptr<std::vector<T>>* val) const {
int32_t size;
+ // used for allocating 'out' vector args, do not use readVectorSizeWithCoarseBoundCheck() here
status_t err = readInt32(&size);
if (err != NO_ERROR) {
return err;
@@ -834,7 +842,7 @@ status_t Parcel::resizeOutVector(std::unique_ptr<std::vector<T>>* val) const {
template<typename T>
status_t Parcel::reserveOutVector(std::vector<T>* val, size_t* size) const {
int32_t read_size;
- status_t err = readInt32(&read_size);
+ status_t err = readVectorSizeWithCoarseBoundCheck(&read_size);
if (err != NO_ERROR) {
return err;
}
@@ -850,7 +858,7 @@ status_t Parcel::reserveOutVector(std::vector<T>* val, size_t* size) const {
template<typename T>
status_t Parcel::reserveOutVector(std::optional<std::vector<T>>* val, size_t* size) const {
int32_t read_size;
- status_t err = readInt32(&read_size);
+ status_t err = readVectorSizeWithCoarseBoundCheck(&read_size);
if (err != NO_ERROR) {
return err;
}
@@ -870,7 +878,7 @@ template<typename T>
status_t Parcel::reserveOutVector(std::unique_ptr<std::vector<T>>* val,
size_t* size) const {
int32_t read_size;
- status_t err = readInt32(&read_size);
+ status_t err = readVectorSizeWithCoarseBoundCheck(&read_size);
if (err != NO_ERROR) {
return err;
}
@@ -923,7 +931,7 @@ status_t Parcel::unsafeReadTypedVector(
std::vector<T>* val,
status_t(Parcel::*read_func)(U*) const) const {
int32_t size;
- status_t status = this->readInt32(&size);
+ status_t status = this->readVectorSizeWithCoarseBoundCheck(&size);
if (status != OK) {
return status;
@@ -965,7 +973,7 @@ status_t Parcel::readNullableTypedVector(std::optional<std::vector<T>>* val,
status_t(Parcel::*read_func)(T*) const) const {
const size_t start = dataPosition();
int32_t size;
- status_t status = readInt32(&size);
+ status_t status = readVectorSizeWithCoarseBoundCheck(&size);
val->reset();
if (status != OK || size < 0) {
@@ -989,7 +997,7 @@ status_t Parcel::readNullableTypedVector(std::unique_ptr<std::vector<T>>* val,
status_t(Parcel::*read_func)(T*) const) const {
const size_t start = dataPosition();
int32_t size;
- status_t status = readInt32(&size);
+ status_t status = readVectorSizeWithCoarseBoundCheck(&size);
val->reset();
if (status != OK || size < 0) {
@@ -1093,7 +1101,7 @@ template<typename T>
status_t Parcel::readParcelableVector(std::optional<std::vector<std::optional<T>>>* val) const {
const size_t start = dataPosition();
int32_t size;
- status_t status = readInt32(&size);
+ status_t status = readVectorSizeWithCoarseBoundCheck(&size);
val->reset();
if (status != OK || size < 0) {
@@ -1117,7 +1125,7 @@ template<typename T>
status_t Parcel::readParcelableVector(std::unique_ptr<std::vector<std::unique_ptr<T>>>* val) const {
const size_t start = dataPosition();
int32_t size;
- status_t status = readInt32(&size);
+ status_t status = readVectorSizeWithCoarseBoundCheck(&size);
val->reset();
if (status != OK || size < 0) {
generated by cgit v1.2.3-59-g8ed1b (git 2.39.0) at 2026-01-07 12:20:54 +0000