The distance (in bytes) between the objects doesn’t matter as a result of we have a wildcopy loop that may copy enormous quantities of information line by line (we management the dimensions of the line). The information that is copied is finally larger than 2MB, so we all know for certain that we’ll find yourself corrupting every object on the chunk that is located after our overflow object. We want to position the item containing our overflowed buffer simply earlier than the massive (0x5000) object containing the primary/submit/coef data constructions that performs a name to perform pointers. Most of the information is allotted “per image” and is freed by jpeg_finish_decompress or jpeg_abort features.
Some data is allocated “permanently” and is not freed until the JPEG object is destroyed. Jemalloc is a bucket-based allocator that divides memory into chunks, all the time of the identical dimension, and makes use of these … Read More