diff options
| author | Christian Brauner <brauner@kernel.org> | 2025-09-12 13:52:50 +0200 |
|---|---|---|
| committer | Christian Brauner <brauner@kernel.org> | 2025-09-19 14:26:16 +0200 |
| commit | d2afdb73f8ad77b49eca9d110d0c54bf30d1df0f (patch) | |
| tree | 7de58ed5f11053677f992c8734dadd1cc935d1a9 | |
| parent | d7afdf889561058068ab46fd8f306c70ef29216a (diff) | |
nsfs: add current_in_namespace()
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>
| -rw-r--r-- | include/linux/nsfs.h | 16 |
1 files changed, 15 insertions, 1 deletions
diff --git a/include/linux/nsfs.h b/include/linux/nsfs.h index fb84aa538091..e5a5fa83d36b 100644 --- a/include/linux/nsfs.h +++ b/include/linux/nsfs.h @@ -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 */ |