patch-2.6.6-vs1.9.0

[linux-2.6.git] / kernel / user.c

diff --git a/kernel/user.c b/kernel/user.c
index f5c9d42..75faf3d 100644 (file)
--- a/kernel/user.c
+++ b/kernel/user.c
@@ -20,8 +20,8 @@
 #define UIDHASH_BITS           8
 #define UIDHASH_SZ             (1 << UIDHASH_BITS)
 #define UIDHASH_MASK           (UIDHASH_SZ - 1)
-#define __uidhashfn(uid)       (((uid >> UIDHASH_BITS) + uid) & UIDHASH_MASK)
-#define uidhashentry(uid)      (uidhash_table + __uidhashfn((uid)))
+#define __uidhashfn(xid,uid)   ((((uid) >> UIDHASH_BITS) + ((uid)^(xid))) & UIDHASH_MASK)
+#define uidhashentry(xid,uid)  (uidhash_table + __uidhashfn((xid),(uid)))
 
 static kmem_cache_t *uid_cachep;
 static struct list_head uidhash_table[UIDHASH_SZ];
@@ -46,7 +46,7 @@ static inline void uid_hash_remove(struct user_struct *up)
        list_del(&up->uidhash_list);
 }
 
-static inline struct user_struct *uid_hash_find(uid_t uid, struct list_head *hashent)
+static inline struct user_struct *uid_hash_find(xid_t xid, uid_t uid, struct list_head *hashent)
 {
        struct list_head *up;
 
@@ -55,7 +55,7 @@ static inline struct user_struct *uid_hash_find(uid_t uid, struct list_head *has
 
                user = list_entry(up, struct user_struct, uidhash_list);
 
-               if(user->uid == uid) {
+               if(user->uid == uid && user->xid == xid) {
                        atomic_inc(&user->__count);
                        return user;
                }
@@ -64,9 +64,9 @@ static inline struct user_struct *uid_hash_find(uid_t uid, struct list_head *has
        return NULL;
 }
 
-struct user_struct *find_user(uid_t uid)
+struct user_struct *find_user(xid_t xid, uid_t uid)
 {
-       return uid_hash_find(uid, uidhashentry(uid));
+       return uid_hash_find(xid, uid, uidhashentry(xid, uid));
 }
 
 void free_uid(struct user_struct *up)
@@ -78,13 +78,13 @@ void free_uid(struct user_struct *up)
        }
 }
 
-struct user_struct * alloc_uid(uid_t uid)
+struct user_struct * alloc_uid(xid_t xid, uid_t uid)
 {
-       struct list_head *hashent = uidhashentry(uid);
+       struct list_head *hashent = uidhashentry(xid, uid);
        struct user_struct *up;
 
        spin_lock(&uidhash_lock);
-       up = uid_hash_find(uid, hashent);
+       up = uid_hash_find(xid, uid, hashent);
        spin_unlock(&uidhash_lock);
 
        if (!up) {
@@ -94,6 +94,7 @@ struct user_struct * alloc_uid(uid_t uid)
                if (!new)
                        return NULL;
                new->uid = uid;
+               new->xid = xid;
                atomic_set(&new->__count, 1);
                atomic_set(&new->processes, 0);
                atomic_set(&new->files, 0);
@@ -103,7 +104,7 @@ struct user_struct * alloc_uid(uid_t uid)
                 * on adding the same user already..
                 */
                spin_lock(&uidhash_lock);
-               up = uid_hash_find(uid, hashent);
+               up = uid_hash_find(xid, uid, hashent);
                if (up) {
                        kmem_cache_free(uid_cachep, new);
                } else {
@@ -148,7 +149,7 @@ static int __init uid_cache_init(void)
 
        /* Insert the root user immediately (init already runs as root) */
        spin_lock(&uidhash_lock);
-       uid_hash_insert(&root_user, uidhashentry(0));
+       uid_hash_insert(&root_user, uidhashentry(0,0));
        spin_unlock(&uidhash_lock);
 
        return 0;