Re: [RFC PATCH 09/41] uidgid: let kuid_t and kgid_t hold a UUID or a GUID
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From: Jan Koester <hidden>
Date: 2026-10-19 02:10:33
Also in:
keyrings, linux-api, linux-arch, linux-cifs, linux-ext4, linux-fsdevel, linux-nfs, lkml, netdev
Hi, here are all patches. I have problems to 42 mails with my provder sryy for that. Am 18.10.26 um 23:02 schrieb Eric Biggers:
On Sun, Oct 18, 2026 at 08:01:30PM +0200, Jan Koester wrote:quoted
Make kuid_t and kgid_t (and vfsuid_t and vfsgid_t, which share their layout) tagged unions: a classic 32 bit id, an RFC 9562 UUID, or a Microsoft GUID. KID_LEGACY is 0, so zeroed memory still holds the root ids, and KUIDT_INIT()/KGIDT_INIT() keep building classic ids, so the bulk of the kernel needs no change. The member is renamed from val to legacy so the compiler finds code that peeks at it directly.Most Linux systems aren't going to want this bloat to the core uid and gid types. So if this is supported at all (unclear it's worth it...), it will need to be controlled by a default-off kconfig option. Side note: the subject line says the series contains 41 patches, but it seems only 11 were actually sent. - Eric
Attachments
- uid_r-0001-uuid-move-uuid_t-and-guid_t-into-linux-uuid_types.h.patch [text/x-patch] 1961 bytes · preview
- uid_r-0002-uapi-add-linux-uidgid_r.h-for-128-bit-capable-user-a.patch [text/x-patch] 2820 bytes · preview
- uid_r-0003-uidgid-add-uid_is_legacy-and-gid_is_legacy.patch [text/x-patch] 1305 bytes · preview
- uid_r-0004-net-sock-read-sk_uid-through-a-seqcount.patch [text/x-patch] 5237 bytes · preview
- uid_r-0005-af_unix-keep-sender-ids-in-skb-cb-only-when-they-are.patch [text/x-patch] 4508 bytes · preview
- uid_r-0006-netlink-keep-classic-sender-ids-in-skb-cb.patch [text/x-patch] 4249 bytes · preview
- uid_r-0007-Bluetooth-keep-classic-sender-ids-in-skb-cb.patch [text/x-patch] 2145 bytes · preview
- uid_r-0008-smb-client-use-__kuid_val-for-the-unix-SIDs-of-the-c.patch [text/x-patch] 2502 bytes · preview
- uid_r-0009-uidgid-let-kuid_t-and-kgid_t-hold-a-UUID-or-a-GUID.patch [text/x-patch] 21242 bytes · preview
- uid_r-0010-uidgid-convert-between-kernel-ids-and-the-ids-of-the.patch [text/x-patch] 12658 bytes · preview
- uid_r-0011-fscrypt-show-the-whole-uid-in-the-description-of-use.patch [text/x-patch] 1841 bytes · preview
- uid_r-0012-keys-name-per-user-keyrings-of-UUID-and-GUID-users-b.patch [text/x-patch] 12396 bytes · preview
- uid_r-0013-ublk-refuse-unprivileged-devices-to-UUID-and-GUID-us.patch [text/x-patch] 2569 bytes · preview
- uid_r-0014-nfsd-don-t-hand-out-uid-0-for-read-layouts-of-UUID-o.patch [text/x-patch] 1269 bytes · preview
- uid_r-0015-SUNRPC-name-UUID-and-GUID-users-to-gssd-as-uid_r.patch [text/x-patch] 3724 bytes · preview
- uid_r-0016-ecryptfs-hash-daemons-by-kuid_hash.patch [text/x-patch] 1100 bytes · preview
- uid_r-0017-quota-don-t-account-UUID-and-GUID-owners.patch [text/x-patch] 2130 bytes · preview
- uid_r-0018-fs-keep-UUID-and-GUID-owners-off-filesystems-that-ca.patch [text/x-patch] 4344 bytes · preview
- uid_r-0019-cred-add-the-_r-variants-of-the-get-set-id-system-ca.patch [text/x-patch] 24812 bytes · preview
- uid_r-0020-groups-add-getgroups_r-and-setgroups_r.patch [text/x-patch] 4982 bytes · preview
- uid_r-0021-fs-add-chown_r-lchown_r-fchown_r-and-fchownat_r.patch [text/x-patch] 8283 bytes · preview
- uid_r-0022-arch-wire-up-the-_r-uid-and-gid-system-calls.patch [text/x-patch] 22493 bytes · preview
- uid_r-0023-statx-report-UUID-and-GUID-owners.patch [text/x-patch] 4105 bytes · preview
- uid_r-0024-shmem-ramfs-allow-UUID-and-GUID-owners.patch [text/x-patch] 1373 bytes · preview
- uid_r-0025-uidgid-parse-and-print-ids-in-their-text-form.patch [text/x-patch] 7715 bytes · preview
- uid_r-0026-proc-show-UUID-and-GUID-ids-in-status-accept-them-fo.patch [text/x-patch] 4910 bytes · preview
- uid_r-0027-audit-log-UUID-and-GUID-ids-in-full.patch [text/x-patch] 17259 bytes · preview
- uid_r-0028-net-add-SO_PEERCRED_R-SO_PEERGROUPS_R-and-SCM_CREDEN.patch [text/x-patch] 13868 bytes · preview
- uid_r-0029-signal-report-the-sender-s-UUID-or-GUID-uid-in-si_ui.patch [text/x-patch] 21954 bytes · preview
- uid_r-0030-ipc-add-IPC_STAT_R-and-IPC_SET_R.patch [text/x-patch] 21066 bytes · preview
- uid_r-0031-ext4-add-the-uid_r-feature-for-UUID-and-GUID-owners.patch [text/x-patch] 11045 bytes · preview
- uid_r-0032-ext4-let-uid_r-be-turned-on-while-the-filesystem-is-.patch [text/x-patch] 5664 bytes · preview
- uid_r-0033-posix_acl-support-UUID-and-GUID-entries.patch [text/x-patch] 8910 bytes · preview
- uid_r-0034-ext4-store-ACLs-with-UUID-and-GUID-entries-on-uid_r-.patch [text/x-patch] 8122 bytes · preview
- uid_r-0035-Documentation-describe-UUID-and-GUID-user-and-group-.patch [text/x-patch] 8198 bytes · preview
- uid_r-0036-selftests-add-tests-for-UUID-and-GUID-ids.patch [text/x-patch] 17322 bytes · preview
- uid_r-0037-ovl-allow-UUID-and-GUID-owners-when-the-upper-layer-.patch [text/x-patch] 1268 bytes · preview
- uid_r-0038-devpts-allow-UUID-and-GUID-owners.patch [text/x-patch] 1153 bytes · preview
- uid_r-0039-ksmbd-log-in-UUID-and-GUID-users-and-map-them-to-SID.patch [text/x-patch] 22119 bytes · preview
- uid_r-0040-nfsd-nfs-carry-UUID-and-GUID-owners-as-their-text-fo.patch [text/x-patch] 7714 bytes · preview
- uid_r-0041-Documentation-uid_r-describe-SMB-and-NFSv4.patch [text/x-patch] 2024 bytes · preview
- uid_r-0042-ksmbd-pass-through-NTLM-authentication-to-a-domain-c.patch [text/x-patch] 11593 bytes · preview
- uid_r-0043-ksmbd-put-the-workgroup-into-the-NTLMSSP-target-info.patch [text/x-patch] 5644 bytes · preview