[PATCH v4 26/40] notify: handle idmapped mounts
From: Christian Brauner <hidden>
Date: 2020-12-04 00:12:19
Also in:
linux-ext4, linux-fsdevel, linux-integrity, linux-security-module, selinux
Subsystem:
fanotify, filesystems (vfs and infrastructure), fsnotify: filesystem notification infrastructure, inotify, the rest · Maintainers:
Jan Kara, Alexander Viro, Christian Brauner, Linus Torvalds
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@lst.de> Cc: David Howells <dhowells@redhat.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: linux-fsdevel@vger.kernel.org Signed-off-by: Christian Brauner <redacted> --- /* 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