[automerger] ResStringPool: Fix security vulnerability am: 7e54c3f261 am: 98e2d2ec50 am: 24a89da344 am: d85632ae40

Change-Id: I24a1df41eb29a6ac7e6c67368f07c6702dacf071

1 files changed, 18 insertions, 0 deletions

diff --git a/libs/androidfw/ResourceTypes.cpp b/libs/androidfw/ResourceTypes.cpp
index 7cb42169cd76..f608d7bf0681 100644
--- a/libs/androidfw/ResourceTypes.cpp
+++ b/libs/androidfw/ResourceTypes.cpp
@@ -457,6 +457,22 @@ status_t ResStringPool::setTo(const void* data, size_t size, bool copyData)
 
     uninit();
 
+    // The chunk must be at least the size of the string pool header.
+    if (size < sizeof(ResStringPool_header)) {
+        LOG_ALWAYS_FATAL("Bad string block: data size %zu is too small to be a string block", size);
+        return (mError=BAD_TYPE);
+    }
+
+    // The data is at least as big as a ResChunk_header, so we can safely validate the other
+    // header fields.
+    // `data + size` is safe because the source of `size` comes from the kernel/filesystem.
+    if (validate_chunk(reinterpret_cast<const ResChunk_header*>(data), sizeof(ResStringPool_header),
+                       reinterpret_cast<const uint8_t*>(data) + size,
+                       "ResStringPool_header") != NO_ERROR) {
+        LOG_ALWAYS_FATAL("Bad string block: malformed block dimensions");
+        return (mError=BAD_TYPE);
+    }
+
     const bool notDeviceEndian = htods(0xf0) != 0xf0;
 
     if (copyData || notDeviceEndian) {
@@ -468,6 +484,8 @@ status_t ResStringPool::setTo(const void* data, size_t size, bool copyData)
         data = mOwnedData;
     }
 
+    // The size has been checked, so it is safe to read the data in the ResStringPool_header
+    // data structure.
     mHeader = (const ResStringPool_header*)data;
 
     if (notDeviceEndian) {