update post desc

Author: caprinux

_posts/general/2025-08-06-the-art-of-hiding-code-by-modifying-non-volatile-registers.md

@@ -1,6 +1,6 @@
 ---
 title: "Control Flow Obfuscation — What happens if we modify callee-saved registers? 🙈"
-description: desc
+description: Breaking compiler conventions to hide code and obfuscate control flow by modifying non-volatile registers.
 date: 2025-08-18 00:00:01 +0800
 categories: [Research]
 tags: [obfuscation, rev]
@@ -493,4 +493,4 @@ While this is not any ground-breaking research, such research is fun and interes
 
 In my next obfuscation adventure, I hope to be able to do less manual work and directly instrument the assembly code on the compiler level, possibly through writing LLVM passes.
 
-Hopefully this was a good read and see you in the next one!
+Hopefully this was a good read and see you in the next one!