On 2025-09-10, Christian Brauner <brauner@xxxxxxxxxx> wrote: > 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. > > Signed-off-by: Christian Brauner <brauner@xxxxxxxxxx> Looks good, feel free to add my Reviewed-by: Aleksa Sarai <cyphar@xxxxxxxxxx> > --- > include/linux/nsfs.h | 16 +++++++++++++++- > 1 file changed, 15 insertions(+), 1 deletion(-) > > 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 */ > > -- > 2.47.3 > -- Aleksa Sarai Senior Software Engineer (Containers) SUSE Linux GmbH https://www.cyphar.com/
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