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Flipping Pages: An analysis of a new Linux vulnerability in nf_tables and hardened exploitation techniques

A tale about exploiting KernelCTF Mitigation, Debian, and Ubuntu instances with a double-free in nf tables in the Linux kernel, using novel techniques like Dirty Pagedirectory. All without even having to recompile the exploit for different kernel targets once. ....

Dirty Pagetable , Dirty Pagedirectory , Reverse Path Forwarding , Tables Have Turned , Linux Kernel , Page Allocation , Analyzing Linux , Translation Lookaside Buffer , Harvards Operating Systems , Page Upper Directory , Page Middle Directory , Kernel Address Space Layout Randomization , Intel Xeon ,

Understanding x86_64 Paging

I’ve spent quite a lot of time messing with x86 64 page tables, understanding address translation is not easy and when I started learning about it I felt like a lot of the material out there on how it works was hard for me to wrap my head around. So in this blog post I am going to attempt to provide a kind of “what I wish I had when learning about paging”. ....

Page Map Level , Kernel Security , Virtual Page , Physical Page , Page Frame , Virtual Pages , Page Table , Page Global Directory , Not Executable , Cache Disabled , Write Through , Page Write Through , Page Size , Page Size , Protection Key , Translation Lookaside Buffer , Attribute Table , Page Attribute Table , Memory Type , Write Through , Memory Protection Key , Huge Page , Huge Page , Size Bit , Virtual Address , Physical Address ,

Exploring the section layout in linker output

This article describes section layout and its interaction with dynamic loaders and huge pages. Let's begin with a Linux x86-64 example involving global variables exhibiting various properties such as ....

Translation Lookaside Buffer ,