readCString: implemented with readInplace
All read logic must go through and be validated
in the same few places.
Bug: 376674798
Test: binderClearBufTest covers this, and in presubmit
Change-Id: Icc0ade84b671ecd3026069d8f672ff254d58e995
diff --git a/libs/binder/Parcel.cpp b/libs/binder/Parcel.cpp
index 96d821e..a5f416f 100644
--- a/libs/binder/Parcel.cpp
+++ b/libs/binder/Parcel.cpp
@@ -2223,9 +2223,7 @@
const char* eos = reinterpret_cast<const char*>(memchr(str, 0, avail));
if (eos) {
const size_t len = eos - str;
- mDataPos += pad_size(len+1);
- ALOGV("readCString Setting data pos of %p to %zu", this, mDataPos);
- return str;
+ return static_cast<const char*>(readInplace(len + 1));
}
}
return nullptr;
diff --git a/libs/binder/tests/binderParcelUnitTest.cpp b/libs/binder/tests/binderParcelUnitTest.cpp
index 32a70e5..6259d9d 100644
--- a/libs/binder/tests/binderParcelUnitTest.cpp
+++ b/libs/binder/tests/binderParcelUnitTest.cpp
@@ -33,6 +33,38 @@
using android::binder::Status;
using android::binder::unique_fd;
+static void checkCString(const char* str) {
+ for (size_t i = 0; i < 3; i++) {
+ Parcel p;
+
+ for (size_t j = 0; j < i; j++) p.writeInt32(3);
+
+ p.writeCString(str);
+ int32_t pos = p.dataPosition();
+
+ p.setDataPosition(0);
+
+ for (size_t j = 0; j < i; j++) p.readInt32();
+ const char* str2 = p.readCString();
+
+ ASSERT_EQ(std::string(str), str2);
+ ASSERT_EQ(pos, p.dataPosition());
+ }
+}
+
+TEST(Parcel, TestReadCString) {
+ // we should remove the *CString APIs, but testing them until
+ // they are deleted.
+ checkCString("");
+ checkCString("a");
+ checkCString("\n");
+ checkCString("32");
+ checkCString("321");
+ checkCString("3210");
+ checkCString("3210b");
+ checkCString("123434");
+}
+
TEST(Parcel, NonNullTerminatedString8) {
String8 kTestString = String8("test-is-good");