https://blog.kernelstub.dev/tags/syscalls/Recent content in Syscalls on Prepakis Georgios | Kernelstub | Security ResearcherHugoen-USFri, 13 Sep 2024 00:00:00 +0000https://blog.kernelstub.dev/posts/linux-syscalls-table-x86-64/Fri, 13 Sep 2024 00:00:00 +0000https://blog.kernelstub.dev/posts/linux-syscalls-table-x86-64/<h2 id="overview">Overview</h2> <p>Every time a program on Linux does something that touches the outside world, reading a file, allocating memory, sending a packet, spawning another process, it eventually has to ask the kernel to do it. User space code can&rsquo;t just reach into the kernel&rsquo;s data structures and start editing process tables or filesystem metadata; that would be a security and stability nightmare. Instead, it has to go through a narrow, well-defined door: the system call interface. This post is a reference table for that door on x86-64 Linux, listing every syscall number, its libc-facing name, its man page, and the kernel function that actually handles it once your program&rsquo;s request lands.</p>