mirror of
https://github.com/Divested-Mobile/DivestOS-Build.git
synced 2024-12-10 08:24:20 -05:00
47 lines
1.7 KiB
Diff
47 lines
1.7 KiB
Diff
From cd4a40174b71acd021877341684d8bb1dc8ea4ae Mon Sep 17 00:00:00 2001
|
|
From: "Eric W. Biederman" <ebiederm@xmission.com>
|
|
Date: Wed, 7 Jan 2015 14:28:26 -0600
|
|
Subject: [PATCH] mnt: Fail collect_mounts when applied to unmounted mounts
|
|
|
|
The only users of collect_mounts are in audit_tree.c
|
|
|
|
In audit_trim_trees and audit_add_tree_rule the path passed into
|
|
collect_mounts is generated from kern_path passed an audit_tree
|
|
pathname which is guaranteed to be an absolute path. In those cases
|
|
collect_mounts is obviously intended to work on mounted paths and
|
|
if a race results in paths that are unmounted when collect_mounts
|
|
it is reasonable to fail early.
|
|
|
|
The paths passed into audit_tag_tree don't have the absolute path
|
|
check. But are used to play with fsnotify and otherwise interact with
|
|
the audit_trees, so again operating only on mounted paths appears
|
|
reasonable.
|
|
|
|
Avoid having to worry about what happens when we try and audit
|
|
unmounted filesystems by restricting collect_mounts to mounts
|
|
that appear in the mount tree.
|
|
|
|
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
|
|
---
|
|
fs/namespace.c | 7 +++++--
|
|
1 file changed, 5 insertions(+), 2 deletions(-)
|
|
|
|
diff --git a/fs/namespace.c b/fs/namespace.c
|
|
index 2b12b7a9455d0..acc5583764dc0 100644
|
|
--- a/fs/namespace.c
|
|
+++ b/fs/namespace.c
|
|
@@ -1669,8 +1669,11 @@ struct vfsmount *collect_mounts(struct path *path)
|
|
{
|
|
struct mount *tree;
|
|
namespace_lock();
|
|
- tree = copy_tree(real_mount(path->mnt), path->dentry,
|
|
- CL_COPY_ALL | CL_PRIVATE);
|
|
+ if (!check_mnt(real_mount(path->mnt)))
|
|
+ tree = ERR_PTR(-EINVAL);
|
|
+ else
|
|
+ tree = copy_tree(real_mount(path->mnt), path->dentry,
|
|
+ CL_COPY_ALL | CL_PRIVATE);
|
|
namespace_unlock();
|
|
if (IS_ERR(tree))
|
|
return ERR_CAST(tree);
|