Offensive Security
UnderStanding The Linux Kernel 3rd Edition.pdf
اگر علاقمندید به مطالعه عمیق در لینوکس، کتاب بالارو حتما بخونید.
برای کسانی که میخوان LinuxPostExploit کار کنن بشدت مفید خواهد بود.
برای کسانی که میخوان LinuxPostExploit کار کنن بشدت مفید خواهد بود.
x86 Protection Rings Model
CPU Security Layers for Privilege Separation
In x86 architecture, Protection Rings divide code execution into 4 levels (from Ring 0 with highest CPL to Ring 3 with lowest) to prevent unauthorized access to sensitive resources. This model operates via segment denoscriptors in the GDT and privilege checks (e.g., DPL).
Ring 0 (Kernel Mode):
Full access to CPU and memory; manages scheduler, paging, and interrupts. Only trusted code executes here.
Ring 1 (Driver Mode):
Medium privilege for device drivers; access to I/O ports and DMA, but limited to secure transitions.
Ring 2:
Legacy and rare; for specific execution domains.
Ring 3 (User Mode):
User applications; restricted to non-privileged instructions and system calls (via SYSCALL/INT).
@GoSecurity
#os #linux #cpu #ring_model #privilege
CPU Security Layers for Privilege Separation
In x86 architecture, Protection Rings divide code execution into 4 levels (from Ring 0 with highest CPL to Ring 3 with lowest) to prevent unauthorized access to sensitive resources. This model operates via segment denoscriptors in the GDT and privilege checks (e.g., DPL).
Ring 0 (Kernel Mode):
Full access to CPU and memory; manages scheduler, paging, and interrupts. Only trusted code executes here.
Ring 1 (Driver Mode):
Medium privilege for device drivers; access to I/O ports and DMA, but limited to secure transitions.
Ring 2:
Legacy and rare; for specific execution domains.
Ring 3 (User Mode):
User applications; restricted to non-privileged instructions and system calls (via SYSCALL/INT).
@GoSecurity
#os #linux #cpu #ring_model #privilege
👍3
X86 Memory Architecture and Memory Mapping Schemes
https://mohitmishra786.github.io/TheCoreDump/posts/X86-Memory-Architecture-and-Memory-Mapping-Schemes/
https://mohitmishra786.github.io/TheCoreDump/posts/X86-Memory-Architecture-and-Memory-Mapping-Schemes/
TheCoreDump
X86 Memory Architecture and Memory Mapping Schemes
A comprehensive exploration of x86 memory architecture and mapping schemes, covering segmentation, paging, virtual memory management, and memory protection mechanisms.
IMG_1966.JPG
466.8 KB
این تصویر یک اینفوگرافیک (infographic) است که مدل مرجع OSI (Open Systems Interconnection) را با مدل TCP/IP (Transmission Control Protocol/Internet Protocol) مقایسه میکند. این دو مدل، چارچوبهای مفهومی برای درک و پیادهسازی شبکههای کامپیوتری هستند. مدل OSI دارای ۷ لایه است و بیشتر نظری است، در حالی که مدل TCP/IP دارای ۴ لایه است و عملیتر (پایه اینترنت مدرن). جدول شامل ستونهایی برای لایههای OSI، توابع هر لایه، لایههای TCP/IP، واحدهای داده پروتکل (PDUها)، و سختافزارهای مرتبط است.
@GoSecurity
#osi #tcpip #tcp #structure
@GoSecurity
#osi #tcpip #tcp #structure
❤4
Linux-basic.pdf
822.4 KB
Linux Tutorial
This research used the ALICE High Performance Computing Facility at the University of Leicester
@GoSecurity
#linux #lpic
This research used the ALICE High Performance Computing Facility at the University of Leicester
@GoSecurity
#linux #lpic
how to use the Havoc framework and develop Beacon Object Files
https://lorenzomeacci.com/the-havoc-framework
#c2 #BOF
https://lorenzomeacci.com/the-havoc-framework
#c2 #BOF
Lorenzo Meacci
The Havoc framework | Lorenzo Meacci
In this blog post, I will demonstrate how to use the Havoc framework and develop Beacon Object Files (BOFs).