Enable notify implementations to handle idmapped mounts by passing down
the mount's user namespace. If the initial user namespace is passed
nothing changes so non-idmapped mounts will see identical behavior as
before.
Cc: Christoph Hellwig <hch@xxxxxx>
Cc: David Howells <dhowells@xxxxxxxxxx>
Cc: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Cc: linux-fsdevel@xxxxxxxxxxxxxxx
Signed-off-by: Christian Brauner <christian.brauner@xxxxxxxxxx>
---
/* v2 */
patch introduced
/* v3 */
unchanged
/* v4 */
unchanged
---
fs/notify/fanotify/fanotify_user.c | 2 +-
fs/notify/inotify/inotify_user.c | 3 ++-
2 files changed, 3 insertions(+), 2 deletions(-)
diff --git a/fs/notify/fanotify/fanotify_user.c b/fs/notify/fanotify/fanotify_user.c
index de4d01bb1d8d..e3b2cb6a9d81 100644
--- a/fs/notify/fanotify/fanotify_user.c
+++ b/fs/notify/fanotify/fanotify_user.c
@@ -702,7 +702,7 @@ static int fanotify_find_path(int dfd, const char __user *filename,
}
/* you can only watch an inode if you have read permissions on it */
- ret = inode_permission(&init_user_ns, path->dentry->d_inode, MAY_READ);
+ ret = inode_permission(mnt_user_ns(path->mnt), path->dentry->d_inode, MAY_READ);
if (ret) {
path_put(path);
goto out;
diff --git a/fs/notify/inotify/inotify_user.c b/fs/notify/inotify/inotify_user.c
index e995fd4e4e53..f39f5b81f2b3 100644
--- a/fs/notify/inotify/inotify_user.c
+++ b/fs/notify/inotify/inotify_user.c
@@ -31,6 +31,7 @@
#include <linux/wait.h>
#include <linux/memcontrol.h>
#include <linux/security.h>
+#include <linux/mount.h>
#include "inotify.h"
#include "../fdinfo.h"
@@ -343,7 +344,7 @@ static int inotify_find_inode(const char __user *dirname, struct path *path,
if (error)
return error;
/* you can only watch an inode if you have read permissions on it */
- error = inode_permission(&init_user_ns, path->dentry->d_inode, MAY_READ);
+ error = inode_permission(mnt_user_ns(path->mnt), path->dentry->d_inode, MAY_READ);
if (error) {
path_put(path);
return error;
--
2.29.2
