Messages in this thread Patch in this message | | | Date | Tue, 19 Dec 2006 17:01:06 -0600 | From | "Serge E. Hallyn" <> | Subject | [PATCH 5/8] user ns: prepare copy_tree, copy_mnt, and their callers to handle errs |
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From: Serge E. Hallyn <serue@us.ibm.com> Subject: [PATCH 5/8] user ns: prepare copy_tree, copy_mnt, and their callers to handle errs
With shareduserns and non-shareduserns mounts, it will be possible for clone_mnt to return -EPERM if a namespace tries to bind mount a non-shareduserns vfsmnt from another user namespace. But currently they only return NULL, which is interpreted as -ENOMEM. Update the callers to handle other errors.
Signed-off-by: Serge E. Hallyn <serue@us.ibm.com> --- fs/namespace.c | 20 ++++++++++++-------- fs/pnode.c | 5 +++-- 2 files changed, 15 insertions(+), 10 deletions(-)
diff --git a/fs/namespace.c b/fs/namespace.c index 9f98a67..f85dd73 100644 --- a/fs/namespace.c +++ b/fs/namespace.c @@ -709,8 +709,9 @@ struct vfsmount *copy_tree(struct vfsmou return NULL; res = q = clone_mnt(mnt, dentry, flag); - if (!q) - goto Enomem; + if (!q || IS_ERR(q)) { + return q; + } q->mnt_mountpoint = mnt->mnt_mountpoint; p = mnt; @@ -731,8 +732,9 @@ struct vfsmount *copy_tree(struct vfsmou nd.mnt = q; nd.dentry = p->mnt_mountpoint; q = clone_mnt(p, p->mnt_root, flag); - if (!q) - goto Enomem; + if (!q || IS_ERR(q)) { + goto Error; + } spin_lock(&vfsmount_lock); list_add_tail(&q->mnt_list, &res->mnt_list); attach_mnt(q, &nd); @@ -740,7 +742,7 @@ struct vfsmount *copy_tree(struct vfsmou } } return res; -Enomem: +Error: if (res) { LIST_HEAD(umount_list); spin_lock(&vfsmount_lock); @@ -748,7 +750,7 @@ Enomem: spin_unlock(&vfsmount_lock); release_mounts(&umount_list); } - return NULL; + return q; } /* @@ -928,8 +930,10 @@ static int do_loopback(struct nameidata else mnt = clone_mnt(old_nd.mnt, old_nd.dentry, 0); - if (!mnt) + if (!mnt || IS_ERR(mnt)) { + err = mnt ? PTR_ERR(mnt) : -ENOMEM; goto out; + } err = graft_tree(mnt, nd); if (err) { @@ -1466,7 +1470,7 @@ struct mnt_namespace *dup_mnt_ns(struct /* First pass: copy the tree topology */ new_ns->root = copy_tree(mnt_ns->root, mnt_ns->root->mnt_root, CL_COPY_ALL | CL_EXPIRE); - if (!new_ns->root) { + if (!new_ns->root || IS_ERR(new_ns->root)) { up_write(&namespace_sem); kfree(new_ns); return NULL; diff --git a/fs/pnode.c b/fs/pnode.c index 56aacea..1821c95 100644 --- a/fs/pnode.c +++ b/fs/pnode.c @@ -187,8 +187,9 @@ int propagate_mnt(struct vfsmount *dest_ source = get_source(m, prev_dest_mnt, prev_src_mnt, &type); - if (!(child = copy_tree(source, source->mnt_root, type))) { - ret = -ENOMEM; + child = copy_tree(source, source->mnt_root, type); + if (!child || IS_ERR(child)) { + ret = child ? PTR_ERR(child) : -ENOMEM; list_splice(tree_list, tmp_list.prev); goto out; } -- 1.4.1 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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