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d2afdb73f8
Add a helper to easily check whether a given namespace is the caller's current namespace. This is currently open-coded in a lot of places. Simply switch on the type and compare the results. Reviewed-by: Aleksa Sarai <cyphar@cyphar.com> Signed-off-by: Christian Brauner <brauner@kernel.org>
41 lines
1.4 KiB
C
41 lines
1.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/* Copyright (c) 2025 Christian Brauner <brauner@kernel.org> */
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#ifndef _LINUX_NSFS_H
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#define _LINUX_NSFS_H
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#include <linux/ns_common.h>
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#include <linux/cred.h>
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#include <linux/pid_namespace.h>
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struct path;
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struct task_struct;
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struct proc_ns_operations;
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int ns_get_path(struct path *path, struct task_struct *task,
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const struct proc_ns_operations *ns_ops);
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typedef struct ns_common *ns_get_path_helper_t(void *);
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int ns_get_path_cb(struct path *path, ns_get_path_helper_t ns_get_cb,
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void *private_data);
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bool ns_match(const struct ns_common *ns, dev_t dev, ino_t ino);
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int ns_get_name(char *buf, size_t size, struct task_struct *task,
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const struct proc_ns_operations *ns_ops);
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void nsfs_init(void);
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#define __current_namespace_from_type(__ns) \
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_Generic((__ns), \
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struct cgroup_namespace *: current->nsproxy->cgroup_ns, \
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struct ipc_namespace *: current->nsproxy->ipc_ns, \
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struct net *: current->nsproxy->net_ns, \
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struct pid_namespace *: task_active_pid_ns(current), \
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struct mnt_namespace *: current->nsproxy->mnt_ns, \
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struct time_namespace *: current->nsproxy->time_ns, \
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struct user_namespace *: current_user_ns(), \
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struct uts_namespace *: current->nsproxy->uts_ns)
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#define current_in_namespace(__ns) (__current_namespace_from_type(__ns) == __ns)
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#endif /* _LINUX_NSFS_H */
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