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userns: Disassociate user_struct from the user_namespace.

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Modify alloc_uid to take a kuid and make the user hash table global.
Stop holding a reference to the user namespace in struct user_struct.

This simplifies the code and makes the per user accounting not
care about which user namespace a uid happens to appear in.

Acked-by: Serge Hallyn <serge.hallyn@canonical.com>
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
This commit is contained in:
Eric W. Biederman 2011-11-16 23:20:58 -08:00
parent 5673a94c14
commit 7b44ab978b
6 changed files with 55 additions and 43 deletions
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6
kernel/user_namespace.c
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@ -27,7 +27,6 @@ int create_user_ns(struct cred *new)
{
struct user_namespace *ns, *parent_ns = new->user_ns;
struct user_struct *root_user;
int n;
ns = kmem_cache_alloc(user_ns_cachep, GFP_KERNEL);
if (!ns)
@ -35,11 +34,8 @@ int create_user_ns(struct cred *new)
kref_init(&ns->kref);
for (n = 0; n < UIDHASH_SZ; ++n)
INIT_HLIST_HEAD(ns->uidhash_table + n);
/* Alloc new root user. */
root_user = alloc_uid(ns, 0);
root_user = alloc_uid(make_kuid(ns, 0));
if (!root_user) {
kmem_cache_free(user_ns_cachep, ns);
return -ENOMEM;