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The Linux kernel user-space API guide¶

While much of the kernel’s user-space API is documented elsewhere (particularly in the man-pages project), some user-space information can also be found in the kernel tree itself. This manual is intended to be the place where this information is gathered.

System calls¶

unshare system call
futex2
eBPF Userspace API
IOCTLs
Introduction of mseal
Restartable Sequences

Security-related interfaces¶

No New Privileges Flag
Seccomp BPF (SECure COMPuting with filters)
Landlock: unprivileged access control
Linux Security Modules
Introduction of non-executable mfd
Speculation Control
TEE (Trusted Execution Environment) Userspace API
Executability check

Devices and I/O¶

OpenCAPI (Open Coherent Accelerator Processor Interface)
Allocating dma-buf using heaps
Exchanging pixel buffers
Firmware Control (FWCTL) Userspace API
GPIO
IOMMUFD
Linux Media Infrastructure userspace API
Dell Systems Management Base Driver
VDUSE - “vDPA Device in Userspace”
ISA Plug & Play support

Everything else¶

Linux-specific ELF idiosyncrasies
Live Update uAPI
Netlink Handbook
Platform Profile Selection (e.g. /sys/firmware/acpi/platform_profile)
VDUSE - “vDPA Device in Userspace”
futex2
Perf ring buffer
NT synchronization primitive driver