{"id":30610171,"url":"https://github.com/devv712/kernel-driver-linux-character-device-driver-simulator","last_synced_at":"2025-08-30T04:15:31.848Z","repository":{"id":309234583,"uuid":"1035568680","full_name":"devv712/Kernel-Driver-Linux-Character-Device-Driver-Simulator","owner":"devv712","description":"This project built a basic Linux character device driver from scratch, exploring low-level OS internals like the Linux kernel module system, user-kernel communication, and device file interfaces. 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The implementation adhered to Linux kernel coding conventions and used a modular design to make the driver reusable and extendable.\n\nKey Technical Work\n1. Driver Development \u0026 Core Functionality\nDeveloped a Loadable Kernel Module (LKM) implementing essential character device operations:\n\nopen() – Initialize access and prepare device state.\n\nread() – Transfer data from kernel space to user space.\n\nwrite() – Accept data from user space into kernel buffers.\n\nrelease() – Close device and release allocated resources.\n\nUsed alloc_chrdev_region() to dynamically allocate major and minor numbers, avoiding static conflicts with existing devices.\n\nRegistered device operations via struct file_operations for smooth integration with /dev/ entries.\n\n2. Kernel ↔ User Communication\nImplemented secure buffer transfers using:\n\ncopy_to_user() – Move data from kernel memory to user space safely.\n\ncopy_from_user() – Read user-provided data into kernel memory.\n\nDesigned a ring buffer mechanism for efficient handling of sequential I/O requests.\n\n3. Module Management \u0026 Lifecycle\nUsed insmod to load and rmmod to remove the module dynamically at runtime.\n\nVerified module state using lsmod and inspected kernel logs with dmesg.\n\nImplemented cleanup routines in module_exit() to avoid memory leaks or dangling pointers.\n\n4. Safety, Synchronization \u0026 Debugging\nAdded spinlocks to ensure thread-safe concurrent access when multiple processes interact with the device.\n\nImplemented error handling for invalid memory access, unexpected I/O requests, and improper device usage.\n\nUsed printk() extensively for runtime kernel-level debugging, logging major events and data flow for verification.\n\n5. Testing \u0026 Validation\nCreated user-space C test programs that interact with /dev/\u003cdevice_name\u003e using standard file I/O functions (fopen, fread, fwrite).\n\nTested under multiple workloads:\n\nSmall and large buffer reads/writes\n\nConcurrent process access\n\nRandom access patterns\n\nVerified stability and correctness under different Linux distributions and kernel versions.\n\n","funding_links":[],"categories":[],"sub_categories":[],"project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fdevv712%2Fkernel-driver-linux-character-device-driver-simulator","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fdevv712%2Fkernel-driver-linux-character-device-driver-simulator","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fdevv712%2Fkernel-driver-linux-character-device-driver-simulator/lists"}