From: Christian Brauner <christian.brauner@ubuntu.com>
To: Alexander Viro <viro@zeniv.linux.org.uk>,
Christoph Hellwig <hch@infradead.org>,
linux-fsdevel@vger.kernel.org
Cc: "John Johansen" <john.johansen@canonical.com>,
"James Morris" <jmorris@namei.org>,
"Mimi Zohar" <zohar@linux.ibm.com>,
"Dmitry Kasatkin" <dmitry.kasatkin@gmail.com>,
"Stephen Smalley" <stephen.smalley.work@gmail.com>,
"Casey Schaufler" <casey@schaufler-ca.com>,
"Arnd Bergmann" <arnd@arndb.de>,
"Andreas Dilger" <adilger.kernel@dilger.ca>,
"OGAWA Hirofumi" <hirofumi@mail.parknet.co.jp>,
"Geoffrey Thomas" <geofft@ldpreload.com>,
"Mrunal Patel" <mpatel@redhat.com>,
"Josh Triplett" <josh@joshtriplett.org>,
"Andy Lutomirski" <luto@kernel.org>,
"Theodore Tso" <tytso@mit.edu>, "Alban Crequy" <alban@kinvolk.io>,
"Tycho Andersen" <tycho@tycho.ws>,
"David Howells" <dhowells@redhat.com>,
"James Bottomley" <James.Bottomley@hansenpartnership.com>,
"Seth Forshee" <seth.forshee@canonical.com>,
"Stéphane Graber" <stgraber@ubuntu.com>,
"Aleksa Sarai" <cyphar@cyphar.com>,
"Lennart Poettering" <lennart@poettering.net>,
"Eric W. Biederman" <ebiederm@xmission.com>,
smbarber@chromium.org, "Phil Estes" <estesp@gmail.com>,
"Serge Hallyn" <serge@hallyn.com>,
"Kees Cook" <keescook@chromium.org>,
"Todd Kjos" <tkjos@google.com>,
"Paul Moore" <paul@paul-moore.com>,
"Jonathan Corbet" <corbet@lwn.net>,
containers@lists.linux-foundation.org,
linux-security-module@vger.kernel.org, linux-api@vger.kernel.org,
linux-ext4@vger.kernel.org, linux-integrity@vger.kernel.org,
selinux@vger.kernel.org,
"Christian Brauner" <christian.brauner@ubuntu.com>,
"Christoph Hellwig" <hch@lst.de>
Subject: [PATCH v4 28/40] ioctl: handle idmapped mounts
Date: Fri, 4 Dec 2020 00:57:24 +0100 [thread overview]
Message-ID: <20201203235736.3528991-29-christian.brauner@ubuntu.com> (raw)
In-Reply-To: <20201203235736.3528991-1-christian.brauner@ubuntu.com>
Enable generic ioctls 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 <christian.brauner@ubuntu.com>
---
/* v2 */
patch introduced
/* v3 */
unchanged
/* v4 */
- Serge Hallyn <serge@hallyn.com>:
- Use "mnt_userns" to refer to a vfsmount's userns everywhere to make
terminology consistent.
---
fs/remap_range.c | 7 +++++--
fs/verity/enable.c | 2 +-
2 files changed, 6 insertions(+), 3 deletions(-)
diff --git a/fs/remap_range.c b/fs/remap_range.c
index 9e5b27641756..26759ee83a22 100644
--- a/fs/remap_range.c
+++ b/fs/remap_range.c
@@ -432,13 +432,16 @@ EXPORT_SYMBOL(vfs_clone_file_range);
/* Check whether we are allowed to dedupe the destination file */
static bool allow_file_dedupe(struct file *file)
{
+ struct user_namespace *mnt_userns = mnt_user_ns(file->f_path.mnt);
+ struct inode *inode = file_inode(file);
+
if (capable(CAP_SYS_ADMIN))
return true;
if (file->f_mode & FMODE_WRITE)
return true;
- if (uid_eq(current_fsuid(), file_inode(file)->i_uid))
+ if (uid_eq(current_fsuid(), i_uid_into_mnt(mnt_userns, inode)))
return true;
- if (!inode_permission(&init_user_ns, file_inode(file), MAY_WRITE))
+ if (!inode_permission(mnt_userns, inode, MAY_WRITE))
return true;
return false;
}
diff --git a/fs/verity/enable.c b/fs/verity/enable.c
index 7449ef0050f4..8b9ea0f0850f 100644
--- a/fs/verity/enable.c
+++ b/fs/verity/enable.c
@@ -369,7 +369,7 @@ int fsverity_ioctl_enable(struct file *filp, const void __user *uarg)
* has verity enabled, and to stabilize the data being hashed.
*/
- err = inode_permission(&init_user_ns, inode, MAY_WRITE);
+ err = inode_permission(mnt_user_ns(filp->f_path.mnt), inode, MAY_WRITE);
if (err)
return err;
--
2.29.2
next prev parent reply other threads:[~2020-12-04 0:13 UTC|newest]
Thread overview: 47+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-03 23:56 [PATCH v4 00/40] idmapped mounts Christian Brauner
2020-12-03 23:56 ` [PATCH v4 01/40] namespace: take lock_mount_hash() directly when changing flags Christian Brauner
2020-12-03 23:56 ` [PATCH v4 02/40] mount: make {lock,unlock}_mount_hash() static Christian Brauner
2020-12-03 23:56 ` [PATCH v4 03/40] namespace: only take read lock in do_reconfigure_mnt() Christian Brauner
2020-12-03 23:57 ` [PATCH v4 04/40] fs: split out functions to hold writers Christian Brauner
2020-12-07 17:08 ` Christoph Hellwig
2020-12-03 23:57 ` [PATCH v4 05/40] fs: add attr_flags_to_mnt_flags helper Christian Brauner
2020-12-07 17:10 ` Christoph Hellwig
2020-12-08 10:07 ` Christian Brauner
2020-12-03 23:57 ` [PATCH v4 06/40] fs: add mount_setattr() Christian Brauner
2020-12-07 17:14 ` Christoph Hellwig
2020-12-08 10:37 ` Christian Brauner
2020-12-08 15:05 ` Christoph Hellwig
2020-12-08 15:22 ` Christian Brauner
2020-12-08 15:26 ` Christian Brauner
2020-12-03 23:57 ` [PATCH v4 07/40] tests: add mount_setattr() selftests Christian Brauner
2020-12-03 23:57 ` [PATCH v4 08/40] fs: add id translation helpers Christian Brauner
2020-12-03 23:57 ` [PATCH v4 09/40] mount: attach mappings to mounts Christian Brauner
2020-12-03 23:57 ` [PATCH v4 10/40] capability: handle idmapped mounts Christian Brauner
2020-12-03 23:57 ` [PATCH v4 11/40] namei: make permission helpers idmapped mount aware Christian Brauner
2020-12-03 23:57 ` [PATCH v4 12/40] inode: make init and " Christian Brauner
2020-12-03 23:57 ` [PATCH v4 13/40] attr: handle idmapped mounts Christian Brauner
2020-12-03 23:57 ` [PATCH v4 14/40] acl: " Christian Brauner
2020-12-03 23:57 ` [PATCH v4 15/40] xattr: " Christian Brauner
2020-12-03 23:57 ` [PATCH v4 16/40] commoncap: " Christian Brauner
2020-12-03 23:57 ` [PATCH v4 17/40] stat: " Christian Brauner
2020-12-03 23:57 ` [PATCH v4 18/40] namei: handle idmapped mounts in may_*() helpers Christian Brauner
2020-12-03 23:57 ` [PATCH v4 19/40] namei: introduce struct renamedata Christian Brauner
2020-12-03 23:57 ` [PATCH v4 20/40] namei: prepare for idmapped mounts Christian Brauner
2020-12-03 23:57 ` [PATCH v4 21/40] open: handle idmapped mounts in do_truncate() Christian Brauner
2020-12-03 23:57 ` [PATCH v4 22/40] open: handle idmapped mounts Christian Brauner
2020-12-03 23:57 ` [PATCH v4 23/40] af_unix: " Christian Brauner
2020-12-03 23:57 ` [PATCH v4 24/40] utimes: " Christian Brauner
2020-12-03 23:57 ` [PATCH v4 25/40] fcntl: " Christian Brauner
2020-12-03 23:57 ` [PATCH v4 26/40] notify: " Christian Brauner
2020-12-03 23:57 ` [PATCH v4 27/40] init: " Christian Brauner
2020-12-03 23:57 ` Christian Brauner [this message]
2020-12-03 23:57 ` [PATCH v4 29/40] would_dump: " Christian Brauner
2020-12-03 23:57 ` [PATCH v4 30/40] exec: " Christian Brauner
2020-12-03 23:57 ` [PATCH v4 32/40] apparmor: " Christian Brauner
2020-12-03 23:57 ` [PATCH v4 33/40] ima: " Christian Brauner
2020-12-03 23:57 ` [PATCH v4 34/40] fat: " Christian Brauner
2020-12-03 23:57 ` [PATCH v4 35/40] ext4: support " Christian Brauner
2020-12-03 23:57 ` [PATCH v4 36/40] ecryptfs: do not mount on top of " Christian Brauner
2020-12-03 23:57 ` [PATCH v4 37/40] overlayfs: " Christian Brauner
2020-12-03 23:57 ` [PATCH v4 38/40] fs: introduce MOUNT_ATTR_IDMAP Christian Brauner
2020-12-03 23:57 ` [PATCH v4 39/40] tests: extend mount_setattr tests Christian Brauner
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