From: sashiko-bot@kernel.org
To: "Jan Koester" <jan.koester@tuxist.de>
Cc: linux-security-module@vger.kernel.org,
linux-ext4@vger.kernel.org, audit@vger.kernel.org, tytso@mit.edu
Subject: Re: [RFC PATCH v2 13/41] ublk: refuse unprivileged devices to UUID and GUID users
Date: Thu, 22 Oct 2026 03:17:36 +0000 [thread overview]
Message-ID: <sashiko-outbox-180914@kernel.org> (raw)
In-Reply-To: <f9cecad11d5acce30303f25861d7e9f25daecc88.1792552161.git.jan.koester@tuxist.de>
> The owner of an unprivileged ublk device is recorded in 32 bit fields of
> struct ublksrv_ctrl_dev_info, and only the owner may open the disk. A
> UUID or GUID user comes out as -1 there, like every other one, so they
> could open each other's devices.
>
> Fail the creation of unprivileged devices by such users with
> -EOVERFLOW, and never let such a user pass the owner check.
>
> Assisted-by: Claude:claude-opus-5-5
>
> Signed-off-by: Jan Koester <jan.koester@tuxist.de>
Sashiko has reviewed this patch and found no issues.
--
Sashiko AI review · https://sashiko.dev/#/patchset/cover.1792552161.git.jan.koester@tuxist.de?part=13
next prev parent reply other threads:[~2026-10-22 3:17 UTC|newest]
Thread overview: 89+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-10-21 3:15 [RFC PATCH v2 00/41] UUID and GUID user and group ids (*_r system calls) Jan Koester
2026-10-21 3:15 ` [RFC PATCH v2 01/41] uuid: move uuid_t and guid_t into <linux/uuid_types.h> Jan Koester
2026-10-22 3:17 ` sashiko-bot
2026-10-21 3:15 ` [RFC PATCH v2 02/41] uapi: add <linux/uidgid_r.h> for 128 bit capable user and group ids Jan Koester
2026-10-22 3:17 ` sashiko-bot
2026-10-21 3:15 ` [RFC PATCH v2 03/41] uidgid: add uid_is_legacy() and gid_is_legacy() Jan Koester
2026-10-22 3:17 ` sashiko-bot
2026-10-21 3:15 ` [RFC PATCH v2 04/41] net: sock: read sk_uid through a seqcount Jan Koester
2026-10-22 3:17 ` sashiko-bot
2026-10-21 3:15 ` [RFC PATCH v2 05/41] af_unix: keep sender ids in skb->cb only when they are classic ids Jan Koester
2026-10-22 3:17 ` sashiko-bot
2026-10-21 3:15 ` [RFC PATCH v2 06/41] netlink: keep classic sender ids in skb->cb Jan Koester
2026-10-22 3:17 ` sashiko-bot
2026-10-21 3:15 ` [RFC PATCH v2 07/41] Bluetooth: " Jan Koester
2026-10-22 3:17 ` sashiko-bot
2026-10-21 3:15 ` [RFC PATCH v2 08/41] smb: client: use __kuid_val() for the unix SIDs of the caller Jan Koester
2026-10-22 3:17 ` sashiko-bot
2026-10-21 3:15 ` [RFC PATCH v2 09/41] uidgid: let kuid_t and kgid_t hold a UUID or a GUID Jan Koester
2026-10-22 3:17 ` sashiko-bot
2026-10-21 3:15 ` [RFC PATCH v2 10/41] uidgid: convert between kernel ids and the ids of the *_r system calls Jan Koester
2026-10-22 3:17 ` sashiko-bot
2026-10-21 3:15 ` [RFC PATCH v2 11/41] fscrypt: show the whole uid in the description of user key claims Jan Koester
2026-10-22 3:17 ` sashiko-bot
2026-10-21 3:15 ` [RFC PATCH v2 12/41] keys: name per-user keyrings of UUID and GUID users by the whole uid Jan Koester
2026-10-22 3:17 ` sashiko-bot
2026-10-21 3:15 ` [RFC PATCH v2 13/41] ublk: refuse unprivileged devices to UUID and GUID users Jan Koester
2026-10-22 3:17 ` sashiko-bot [this message]
2026-10-21 3:15 ` [RFC PATCH v2 14/41] nfsd: don't hand out uid 0 for read layouts of UUID-owned files Jan Koester
2026-10-22 3:17 ` sashiko-bot
2026-10-21 3:15 ` [RFC PATCH v2 15/41] SUNRPC: name UUID and GUID users to gssd as uid_r= Jan Koester
2026-10-22 3:17 ` sashiko-bot
2026-10-21 3:15 ` [RFC PATCH v2 16/41] ecryptfs: hash daemons by kuid_hash() Jan Koester
2026-10-22 3:17 ` sashiko-bot
2026-10-21 3:15 ` [RFC PATCH v2 17/41] quota: don't account UUID and GUID owners Jan Koester
2026-10-22 3:17 ` sashiko-bot
2026-10-21 3:15 ` [RFC PATCH v2 18/41] fs: keep UUID and GUID owners off filesystems that can't store them Jan Koester
2026-10-22 3:17 ` sashiko-bot
2026-10-21 3:15 ` [RFC PATCH v2 19/41] cred: add the *_r variants of the get/set*id() system calls Jan Koester
2026-10-22 3:17 ` sashiko-bot
2026-10-21 3:15 ` [RFC PATCH v2 20/41] groups: add getgroups_r() and setgroups_r() Jan Koester
2026-10-22 3:17 ` sashiko-bot
2026-10-21 3:15 ` [RFC PATCH v2 21/41] fs: add chown_r(), lchown_r(), fchown_r() and fchownat_r() Jan Koester
2026-10-22 3:17 ` sashiko-bot
2026-10-21 3:15 ` [RFC PATCH v2 22/41] arch: wire up the *_r uid and gid system calls Jan Koester
2026-10-22 3:17 ` sashiko-bot
2026-10-21 3:15 ` [RFC PATCH v2 23/41] statx: report UUID and GUID owners Jan Koester
2026-10-22 3:17 ` sashiko-bot
2026-10-21 3:15 ` [RFC PATCH v2 24/41] shmem, ramfs: allow " Jan Koester
2026-10-22 3:17 ` sashiko-bot
2026-10-21 3:15 ` [RFC PATCH v2 25/41] uidgid: parse and print ids in their text form Jan Koester
2026-10-22 3:17 ` sashiko-bot
2026-10-21 3:15 ` [RFC PATCH v2 26/41] proc: show UUID and GUID ids in status, accept them for loginuid Jan Koester
2026-10-22 3:17 ` sashiko-bot
2026-10-21 3:15 ` [RFC PATCH v2 27/41] audit: log UUID and GUID ids in full Jan Koester
2026-10-22 3:17 ` sashiko-bot
2026-10-21 3:15 ` [RFC PATCH v2 28/41] net: add SO_PEERCRED_R, SO_PEERGROUPS_R and SCM_CREDENTIALS_R Jan Koester
2026-10-22 3:17 ` sashiko-bot
2026-10-21 3:15 ` [RFC PATCH v2 29/41] signal: report the sender's UUID or GUID uid in si_uid_r Jan Koester
2026-10-22 3:17 ` sashiko-bot
2026-10-21 3:15 ` [RFC PATCH v2 30/41] ipc: add IPC_STAT_R and IPC_SET_R Jan Koester
2026-10-22 3:17 ` sashiko-bot
2026-10-21 3:15 ` [RFC PATCH v2 31/41] ext4: add the uid_r feature for UUID and GUID owners Jan Koester
2026-10-22 3:17 ` sashiko-bot
2026-10-21 3:15 ` [RFC PATCH v2 32/41] ext4: let uid_r be turned on while the filesystem is mounted Jan Koester
2026-10-22 3:17 ` sashiko-bot
2026-10-21 3:15 ` [RFC PATCH v2 33/41] posix_acl: support UUID and GUID entries Jan Koester
2026-10-22 3:18 ` sashiko-bot
2026-10-21 3:15 ` [RFC PATCH v2 34/41] ext4: store ACLs with UUID and GUID entries on uid_r filesystems Jan Koester
2026-10-22 3:18 ` sashiko-bot
2026-10-21 3:15 ` [RFC PATCH v2 35/41] Documentation: describe UUID and GUID user and group ids Jan Koester
2026-10-22 3:18 ` sashiko-bot
2026-10-21 3:15 ` [RFC PATCH v2 36/41] selftests: add tests for UUID and GUID ids Jan Koester
2026-10-22 3:18 ` sashiko-bot
2026-10-21 3:15 ` [RFC PATCH v2 37/41] ovl: allow UUID and GUID owners when the upper layer does Jan Koester
2026-10-22 3:18 ` sashiko-bot
2026-10-21 3:15 ` [RFC PATCH v2 38/41] devpts: allow UUID and GUID owners Jan Koester
2026-10-22 3:18 ` sashiko-bot
2026-10-21 3:15 ` [RFC PATCH v2 39/41] ksmbd: log in UUID and GUID users and map them to SIDs Jan Koester
2026-10-22 3:18 ` sashiko-bot
2026-10-21 3:16 ` [RFC PATCH v2 40/41] nfsd, nfs: carry UUID and GUID owners as their text form Jan Koester
2026-10-21 17:35 ` Chuck Lever
2026-10-22 2:52 ` Takeshi Nishimura
2026-10-22 3:18 ` sashiko-bot
2026-10-21 3:16 ` [RFC PATCH v2 41/41] Documentation: uid_r: describe SMB and NFSv4 Jan Koester
2026-10-22 3:18 ` sashiko-bot
2026-10-21 3:20 ` [RFC PATCH v2 00/41] UUID and GUID user and group ids (*_r system calls) jan Koester
2026-10-21 14:26 ` Adding dreaded Windows SID-style, or. Repeating history, the bad chapters. UUID/GUIDRe: " Lionel Cons
2026-10-22 17:00 ` Casey Schaufler
2026-10-22 18:26 ` Theodore Tso
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