The mount namespace has supported id retrieval for a while already. Add support for the other types as well.
Signed-off-by: Christian Brauner <[email protected]> --- fs/nsfs.c | 74 +++++++++++++++++++++++++++++++++++++++-------- include/uapi/linux/nsfs.h | 12 ++++++-- 2 files changed, 72 insertions(+), 14 deletions(-) diff --git a/fs/nsfs.c b/fs/nsfs.c index 3c6fcf652633..527480e67fd1 100644 --- a/fs/nsfs.c +++ b/fs/nsfs.c @@ -173,6 +173,13 @@ static bool nsfs_ioctl_valid(unsigned int cmd) case NS_GET_NSTYPE: case NS_GET_OWNER_UID: case NS_GET_MNTNS_ID: + case NS_GET_NETNS_ID: + case NS_GET_CGROUPNS_ID: + case NS_GET_IPCNS_ID: + case NS_GET_UTSNS_ID: + case NS_GET_PIDNS_ID: + case NS_GET_TIMENS_ID: + case NS_GET_USERNS_ID: case NS_GET_PID_FROM_PIDNS: case NS_GET_TGID_FROM_PIDNS: case NS_GET_PID_IN_PIDNS: @@ -226,18 +233,6 @@ 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 +278,61 @@ static long ns_ioctl(struct file *filp, unsigned int ioctl, ret = -ESRCH; return ret; } + case NS_GET_MNTNS_ID: + fallthrough; + case NS_GET_NETNS_ID: + fallthrough; + case NS_GET_CGROUPNS_ID: + fallthrough; + case NS_GET_IPCNS_ID: + fallthrough; + case NS_GET_UTSNS_ID: + fallthrough; + case NS_GET_PIDNS_ID: + fallthrough; + case NS_GET_TIMENS_ID: + fallthrough; + case NS_GET_USERNS_ID: { + __u64 __user *idp; + __u64 id; + int expected_type; + + switch (ioctl) { + case NS_GET_MNTNS_ID: + expected_type = CLONE_NEWNS; + break; + case NS_GET_NETNS_ID: + expected_type = CLONE_NEWNET; + break; + case NS_GET_CGROUPNS_ID: + expected_type = CLONE_NEWCGROUP; + break; + case NS_GET_IPCNS_ID: + expected_type = CLONE_NEWIPC; + break; + case NS_GET_UTSNS_ID: + expected_type = CLONE_NEWUTS; + break; + case NS_GET_PIDNS_ID: + expected_type = CLONE_NEWPID; + break; + case NS_GET_TIMENS_ID: + expected_type = CLONE_NEWTIME; + break; + case NS_GET_USERNS_ID: + expected_type = CLONE_NEWUSER; + break; + default: + return -EINVAL; + } + + if (ns->ops->type != expected_type) + return -EINVAL; + + 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 97d8d80d139f..f7c21840cc09 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 +40,16 @@ 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_NETNS_ID _IOR(NSIO, 13, __u64) +#define NS_GET_CGROUPNS_ID _IOR(NSIO, 14, __u64) +#define NS_GET_IPCNS_ID _IOR(NSIO, 15, __u64) +#define NS_GET_UTSNS_ID _IOR(NSIO, 16, __u64) +#define NS_GET_PIDNS_ID _IOR(NSIO, 17, __u64) +#define NS_GET_TIMENS_ID _IOR(NSIO, 18, __u64) +#define NS_GET_USERNS_ID _IOR(NSIO, 19, __u64) + enum init_ns_ino { IPC_NS_INIT_INO = 0xEFFFFFFFU, UTS_NS_INIT_INO = 0xEFFFFFFEU, -- 2.47.3
