Preface: Android devices that act as both peripheral and central devices can communicate with other BLE peripherals while sending advertisements in peripheral mode. Devices supporting Bluetooth 4.1 and earlier can only use BLE in central mode. Older device chipsets may not support BLE peripheral mode. Background: A BLE device sends out a repetitive packet of…

Preface: Use after free errors sometimes have no effect and other times cause a program to crash. While it is technically feasible for the freed memory to be re-allocated and for an attacker to use this reallocation to launch a buffer overflow attack. Background: Systems with Mali GPUs typically have a shared memory, so you…

Preface: The Memory Management (MM) subsystem is an important cornerstone of the Linux kernel. It provides the necessary utilities for the underlying memory hardware (especially RAM) to meet the different needs of other kernel components and user-space processes. Background: About two months ago, larger anonymous mappings are now THP aligned. When a malloc library allocates…

Preface: DRM and KMS DRM stands for Direct Rendering Manager and was introduced to deal with graphic cards embedding GPUs KMS stands for Kernel Mode Setting and is a sub-part of the DRM API Background: The AMDgpu display manager, amdgpu_dm (or even simpler, dm) sits between DRM and DC. It acts as a liaison, converting…

Preface: The Linux framebuffer and a GPU’s memory serve different purposes in the context of graphics processing. The Linux framebuffer is a simple, low-level graphics interface that allows applications to draw graphics directly to the screen. Background: The DRM/KMS framework is dedicated to the management of the display, graphic and composition subsystems. With the help…

Preface: Kernel extensions – VMWare as well as Qemu also enable you to install a device driver in your host operating system that enables them to speed up execution of kernel code and device accesses by directly executing in kernel mode. Background: VMware Fusion is a software hypervisor developed by VMware for macOS systems. It…

Preface: Compared to pageable memory, pinned memory has only 1 memory transfer. Hence memory transfer time is less for pinned memory than pageable memory. In mapped memory, the address is mapped to the device address space. Hence there is no explicit memory transfer. Background: InfiniBand is a network architecture that is designed for the large-scale…

Preface: In the modern digital world. Digital signatures replace traditional handwritten signatures for identity verification. In the past, pattern matching methods were used to confirm signature integrity through human observation. The integrity of digital signatures is ensured through the Elliptic Curve Digital Signature Algorithm (ECDSA). Background: Elliptic Curve Digital Signature Algorithm (ECDSA) is a cryptographic…

This announcement original published on 20th Feb 2024 Preface: When two components have problems in the same place. If vendor did not specify the details in clear. In this circumstances, the design weakness looks the same. Background: The Enhanced Authentication Plugin (EAP) is an extra software package that doesn’t come pre-installed. Administrators need to install…