![]() ![]() The information below explains how to disable pointer authentication. Sudo apt install gcc make gdb-multiarch -yĬonfigure Pointer Authentication in the Linux kernel Note Similar commands are possible with other package managers (such as yum). ![]() The commands for using the apt package manager are below. Preparation for exercise the following sections If you are looking for cloud instances with Pointer Authentication, AWS instances with Graviton3 processors are a good place to start (C7g, M7g, and R7g). Arm CPU Pointer Authentication Support Tableīelow is a table which lists which Arm processors support Pointer Authentication. This Learning Path will help you understand the impact of protecting your code in this way.įor a deeper discussion. Generation and use of PAC in applications requires compiler support, as function calls and returns will need to be modified. Using the ROP example, if the return address stored in the stack is signed and verified before returning to it, the attacker will not be able to control the program flow and an exception is raised. If attackers attempt to modify such a pointer in memory they will also need to compute the right PAC signature for it. ![]() A Pointer Authentication Code ( PAC) is generated from the value of a given pointer, and is used to verify pointers before using them. Pointer Authentication is a feature, available for Armv8.3-A and Armv9.0-A (and later) Arm architectures, to provide some protection against such attacks. An example of such a security compromise is spawning an interactive shell. By chaining multiple gadgets, the attacker can mislead the program to perform actions that end up in a security compromise. These sequences are known as gadgets, and are prevalent in most code. Return Oriented Programming ( ROP) is a software attack where the attacker corrupts the return address stored in the stack to point it to somewhere in the application with a useful sequence of instructions, ending in an indirect branch. ![]()
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