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nsfs: add current_in_namespace()

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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>
This commit is contained in:
Christian Brauner 2025-09-12 13:52:50 +02:00
parent d7afdf8895
commit d2afdb73f8
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1 changed files with 15 additions and 1 deletions
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16
include/linux/nsfs.h
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@ -5,6 +5,8 @@
#define _LINUX_NSFS_H
#include <linux/ns_common.h>
#include <linux/cred.h>
#include <linux/pid_namespace.h>
struct path;
struct task_struct;
@ -22,5 +24,17 @@ int ns_get_name(char *buf, size_t size, struct task_struct *task,
const struct proc_ns_operations *ns_ops);
void nsfs_init(void);
#endif /* _LINUX_NSFS_H */
#define __current_namespace_from_type(__ns) \
_Generic((__ns), \
struct cgroup_namespace *: current->nsproxy->cgroup_ns, \
struct ipc_namespace *: current->nsproxy->ipc_ns, \
struct net *: current->nsproxy->net_ns, \
struct pid_namespace *: task_active_pid_ns(current), \
struct mnt_namespace *: current->nsproxy->mnt_ns, \
struct time_namespace *: current->nsproxy->time_ns, \
struct user_namespace *: current_user_ns(), \
struct uts_namespace *: current->nsproxy->uts_ns)
#define current_in_namespace(__ns) (__current_namespace_from_type(__ns) == __ns)
#endif /* _LINUX_NSFS_H */