[RFC PATCH v2 02/41] uapi: add <linux/uidgid_r.h> for 128 bit capable user and group ids

[sashiko-bot at kernel.org]

> User and group ids are 32 bit numbers. Identities that come from
> elsewhere -- UUIDs handed out by a directory service, or the GUIDs of a
> Windows domain -- have to be squeezed into that range through mapping
> tables kept in userspace, and the kernel never sees who a process really
> is.
> 
> Add a tagged id for a new family of system calls (named after the
> classic ones with an _r suffix): a classic 32 bit id, an RFC 9562
> version 4 UUID, or a Microsoft GUID in the byte order Windows stores it
> in. Type 0 is "no id", so a zero-initialized id is never root, and lets
> the set*id_r() calls express "unchanged" without a magic number.
> 
> The struct has no 64 bit members and the same layout on all ABIs, so
> none of the new calls needs a compat entry point.
> 
> Assisted-by: Claude:claude-opus-5-5
> 
> Signed-off-by: Jan Koester <jan.koester at tuxist.de>

Sashiko has reviewed this patch and found no issues.

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Sashiko AI review · https://sashiko.dev/#/patchset/cover.1792552161.git.jan.koester@tuxist.de?part=2