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kernfs: pass struct ns_common instead of const void * for namespace tags

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kernfs has historically used const void * to pass around namespace tags
used for directory-level namespace filtering. The only current user of
this is sysfs network namespace tagging where struct net pointers are
cast to void *.

Replace all const void * namespace parameters with const struct
ns_common * throughout the kernfs, sysfs, and kobject namespace layers.
This includes the kobj_ns_type_operations callbacks, kobject_namespace(),
and all sysfs/kernfs APIs that accept or return namespace tags.

Passing struct ns_common is needed because various codepaths require
access to the underlying namespace. A struct ns_common can always be
converted back to the concrete namespace type (e.g., struct net) via
container_of() or to_ns_common() in the reverse direction.

This is a preparatory change for switching to ns_id-based directory
iteration to prevent a KASLR pointer leak through the current use of
raw namespace pointers as hash seeds and comparison keys.

Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Christian Brauner
2026-04-01 12:15:58 +02:00
parent 07712db808
commit e3b2cf6e5d
30 changed files with 175 additions and 148 deletions
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8
include/net/net_namespace.h
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@@ -264,14 +264,14 @@ void ipx_unregister_sysctl(void);
#define ipx_unregister_sysctl()
#endif
#ifdef CONFIG_NET_NS
void __put_net(struct net *net);
static inline struct net *to_net_ns(struct ns_common *ns)
{
return container_of(ns, struct net, ns);
}
#ifdef CONFIG_NET_NS
void __put_net(struct net *net);
/* Try using get_net_track() instead */
static inline struct net *get_net(struct net *net)
{
@@ -309,7 +309,7 @@ static inline int check_net(const struct net *net)
return ns_ref_read(net) != 0;
}
void net_drop_ns(void *);
void net_drop_ns(struct ns_common *);
void net_passive_dec(struct net *net);
#else