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Message-Id: <20250912-work-namespace-v2-30-1a247645cef5@kernel.org>
Date: Fri, 12 Sep 2025 13:52:53 +0200
From: Christian Brauner <brauner@...nel.org>
To: Jan Kara <jack@...e.cz>, Amir Goldstein <amir73il@...il.com>,
linux-fsdevel@...r.kernel.org
Cc: Josef Bacik <josef@...icpanda.com>, Jeff Layton <jlayton@...nel.org>,
Mike Yuan <me@...dnzj.com>,
Zbigniew Jędrzejewski-Szmek <zbyszek@...waw.pl>,
Lennart Poettering <mzxreary@...inter.de>,
Daan De Meyer <daan.j.demeyer@...il.com>, Aleksa Sarai <cyphar@...har.com>,
Alexander Viro <viro@...iv.linux.org.uk>, Jens Axboe <axboe@...nel.dk>,
Tejun Heo <tj@...nel.org>, Johannes Weiner <hannes@...xchg.org>,
Michal Koutný <mkoutny@...e.com>,
Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>, Simon Horman <horms@...nel.org>,
Chuck Lever <chuck.lever@...cle.com>, linux-nfs@...r.kernel.org,
linux-kselftest@...r.kernel.org, linux-block@...r.kernel.org,
linux-kernel@...r.kernel.org, cgroups@...r.kernel.org,
netdev@...r.kernel.org, Christian Brauner <brauner@...nel.org>
Subject: [PATCH v2 30/33] nsfs: add missing id retrieval support
The mount namespace has supported id retrieval for a while already.
Add support for the other types as well.
Signed-off-by: Christian Brauner <brauner@...nel.org>
---
fs/nsfs.c | 25 +++++++++++++------------
include/uapi/linux/nsfs.h | 6 ++++--
2 files changed, 17 insertions(+), 14 deletions(-)
diff --git a/fs/nsfs.c b/fs/nsfs.c
index 22765fcab18e..8484bc4dd3de 100644
--- a/fs/nsfs.c
+++ b/fs/nsfs.c
@@ -177,6 +177,7 @@ static bool nsfs_ioctl_valid(unsigned int cmd)
case NS_GET_TGID_FROM_PIDNS:
case NS_GET_PID_IN_PIDNS:
case NS_GET_TGID_IN_PIDNS:
+ case NS_GET_ID:
return true;
}
@@ -226,18 +227,6 @@ static long ns_ioctl(struct file *filp, unsigned int ioctl,
argp = (uid_t __user *) arg;
uid = from_kuid_munged(current_user_ns(), user_ns->owner);
return put_user(uid, argp);
- case NS_GET_MNTNS_ID: {
- __u64 __user *idp;
- __u64 id;
-
- if (ns->ops->type != CLONE_NEWNS)
- return -EINVAL;
-
- mnt_ns = container_of(ns, struct mnt_namespace, ns);
- idp = (__u64 __user *)arg;
- id = mnt_ns->ns.ns_id;
- return put_user(id, idp);
- }
case NS_GET_PID_FROM_PIDNS:
fallthrough;
case NS_GET_TGID_FROM_PIDNS:
@@ -283,6 +272,18 @@ static long ns_ioctl(struct file *filp, unsigned int ioctl,
ret = -ESRCH;
return ret;
}
+ case NS_GET_MNTNS_ID:
+ if (ns->ops->type != CLONE_NEWNS)
+ return -EINVAL;
+ fallthrough;
+ case NS_GET_ID: {
+ __u64 __user *idp;
+ __u64 id;
+
+ idp = (__u64 __user *)arg;
+ id = ns->ns_id;
+ return put_user(id, idp);
+ }
}
/* extensible ioctls */
diff --git a/include/uapi/linux/nsfs.h b/include/uapi/linux/nsfs.h
index fa86fe3c8bd3..5d5bf22464c9 100644
--- a/include/uapi/linux/nsfs.h
+++ b/include/uapi/linux/nsfs.h
@@ -16,8 +16,6 @@
#define NS_GET_NSTYPE _IO(NSIO, 0x3)
/* Get owner UID (in the caller's user namespace) for a user namespace */
#define NS_GET_OWNER_UID _IO(NSIO, 0x4)
-/* Get the id for a mount namespace */
-#define NS_GET_MNTNS_ID _IOR(NSIO, 0x5, __u64)
/* Translate pid from target pid namespace into the caller's pid namespace. */
#define NS_GET_PID_FROM_PIDNS _IOR(NSIO, 0x6, int)
/* Return thread-group leader id of pid in the callers pid namespace. */
@@ -42,6 +40,10 @@ struct mnt_ns_info {
/* Get previous namespace. */
#define NS_MNT_GET_PREV _IOR(NSIO, 12, struct mnt_ns_info)
+/* Retrieve namespace identifiers. */
+#define NS_GET_MNTNS_ID _IOR(NSIO, 5, __u64)
+#define NS_GET_ID _IOR(NSIO, 13, __u64)
+
enum init_ns_ino {
IPC_NS_INIT_INO = 0xEFFFFFFFU,
UTS_NS_INIT_INO = 0xEFFFFFFEU,
--
2.47.3
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