In Linux, user space can request actions, but the kernel is the final authority for every privileged operation. When enforcement is active (SELinux/AppArmor), even root can’t bypass policy. User space asks. Kernel decides. #linux #cybersecurity #computerscience #software | Command & Code
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By using shared ring buffers between user space and the kernel, io_uring minimizes syscalls and context switches, delivering massive performance gains for storage and networking workloads while introducing new security and observability considerations. Fast I/O comes with new responsibilities. #linux #software #programming #computerscience | Command & Code
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When kernel debugging or tracing produces massive amounts of data, printk is not enough. Linux provides relay interface support (the relay subsystem) to efficiently move large volumes of information from kernel space to user space. Instead of logging line-by-line, relay uses high-throughput buffers (often per-CPU) so the kernel can write trace data with minimal overhead, while user-space tools can read it efficiently through exposed interfaces. Think of relay as a fast “data pipeline” from the k
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