Linux Memory Allocation: malloc, brk, mmap, and RSS
Use a reproducible program, /proc, and strace to inspect how glibc malloc uses brk, mmap, and madvise, and why RSS may stay high after free.
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7 practical articles on Systems / Linux, covering setup, troubleshooting, and production decisions.
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Linux x86-64 Function Calls: Stack Frames, ABI, and GDB
Use a reproducible C program and GDB session to inspect SysV AMD64 arguments, call/ret, stack frames, unwinding, PIE addresses, and optimization.
Linux Dynamic Linking: GOT, PLT, Lazy Binding, and dlopen
A walkthrough into how Linux dynamically links shared libraries at runtime — PIC, GOT, PLT, lazy binding, gdb tracing, and the real cost of -fPIC.
Linux Stack Overflow Protection: Canaries, NX, ASLR, PIE, and RELRO
Build and inspect a reproducible Linux binary to understand Stack Canaries, FORTIFY, NX, Stack Clash protection, ASLR, PIE, RELRO, and CET.
Linux Heap Memory: Arenas, Chunks, Bins, and Tcache
Use a reproducible glibc malloc experiment to separate real leaks, allocator caching, fragmentation, and RSS retention across Arenas, Chunks, Bins, and Tcache.
Linux cgroups: V1, V2, CPU Throttling, and OOM Debugging
Debug Linux cgroup V1 and V2 with cpu.stat, memory.events, PSI, and Kubernetes resource settings to explain CPU throttling, reclaim, and OOM kills.
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Linux Memory Allocation: malloc, brk, mmap, and RSS
Use a reproducible program, /proc, and strace to inspect how glibc malloc uses brk, mmap, and madvise, and why RSS may stay high after free.
Linux x86-64 Function Calls: Stack Frames, ABI, and GDB
Use a reproducible C program and GDB session to inspect SysV AMD64 arguments, call/ret, stack frames, unwinding, PIE addresses, and optimization.
Linux Dynamic Linking: GOT, PLT, Lazy Binding, and dlopen
A walkthrough into how Linux dynamically links shared libraries at runtime — PIC, GOT, PLT, lazy binding, gdb tracing, and the real cost of -fPIC.
Linux Stack Overflow Protection: Canaries, NX, ASLR, PIE, and RELRO
Build and inspect a reproducible Linux binary to understand Stack Canaries, FORTIFY, NX, Stack Clash protection, ASLR, PIE, RELRO, and CET.
Linux Heap Memory: Arenas, Chunks, Bins, and Tcache
Use a reproducible glibc malloc experiment to separate real leaks, allocator caching, fragmentation, and RSS retention across Arenas, Chunks, Bins, and Tcache.
Linux cgroups: V1, V2, CPU Throttling, and OOM Debugging
Debug Linux cgroup V1 and V2 with cpu.stat, memory.events, PSI, and Kubernetes resource settings to explain CPU throttling, reclaim, and OOM kills.
ELF Files: Sections, Segments, Relocations, and Dynamic Linking
Understand ELF files from sections and segments to relocations and dynamic linking, with concrete examples for debugging Linux binaries and loader issues.