X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=fs%2Fnamespace.c;h=2fa9fdf7d6f573f1f6b004ab82d9a0945d9a6f9c;hb=ac4d5f74a9b243d9f3f123fe5ce609478df208d8;hp=587eb0d707ee8d7fd4119aee67c5e4791f4d9d9e;hpb=8ed693d29b25bbd88471ec043cc01581419d0481;p=linux-2.6 diff --git a/fs/namespace.c b/fs/namespace.c index 587eb0d707..2fa9fdf7d6 100644 --- a/fs/namespace.c +++ b/fs/namespace.c @@ -40,7 +40,7 @@ static inline int sysfs_init(void) __cacheline_aligned_in_smp DEFINE_SPINLOCK(vfsmount_lock); static struct list_head *mount_hashtable; -static int hash_mask, hash_bits; +static int hash_mask __read_mostly, hash_bits __read_mostly; static kmem_cache_t *mnt_cache; static inline unsigned long hash(struct vfsmount *mnt, struct dentry *dentry) @@ -160,7 +160,7 @@ clone_mnt(struct vfsmount *old, struct dentry *root) mnt->mnt_root = dget(root); mnt->mnt_mountpoint = mnt->mnt_root; mnt->mnt_parent = mnt; - mnt->mnt_namespace = old->mnt_namespace; + mnt->mnt_namespace = current->namespace; /* stick the duplicate mount on the same expiry list * as the original if that was on one */ @@ -537,7 +537,6 @@ lives_below_in_same_fs(struct dentry *d, struct dentry *dentry) static struct vfsmount *copy_tree(struct vfsmount *mnt, struct dentry *dentry) { struct vfsmount *res, *p, *q, *r, *s; - struct list_head *h; struct nameidata nd; res = q = clone_mnt(mnt, dentry); @@ -546,8 +545,7 @@ static struct vfsmount *copy_tree(struct vfsmount *mnt, struct dentry *dentry) q->mnt_mountpoint = mnt->mnt_mountpoint; p = mnt; - for (h = mnt->mnt_mounts.next; h != &mnt->mnt_mounts; h = h->next) { - r = list_entry(h, struct vfsmount, mnt_child); + list_for_each_entry(r, &mnt->mnt_mounts, mnt_child) { if (!lives_below_in_same_fs(r->mnt_mountpoint, dentry)) continue; @@ -1334,8 +1332,12 @@ asmlinkage long sys_pivot_root(const char __user *new_root, const char __user *p error = -EINVAL; if (user_nd.mnt->mnt_root != user_nd.dentry) goto out2; /* not a mountpoint */ + if (user_nd.mnt->mnt_parent == user_nd.mnt) + goto out2; /* not attached */ if (new_nd.mnt->mnt_root != new_nd.dentry) goto out2; /* not a mountpoint */ + if (new_nd.mnt->mnt_parent == new_nd.mnt) + goto out2; /* not attached */ tmp = old_nd.mnt; /* make sure we can reach put_old from new_root */ spin_lock(&vfsmount_lock); if (tmp != new_nd.mnt) {