From: Miklos Szeredi <mszeredi@redhat.com>
To: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: lkml <linux-kernel@vger.kernel.org>,
Linux Containers <containers@lists.linux-foundation.org>,
linux-fsdevel <linux-fsdevel@vger.kernel.org>,
Alban Crequy <alban@kinvolk.io>,
Seth Forshee <seth.forshee@canonical.com>,
Sargun Dhillon <sargun@sargun.me>,
Dongsu Park <dongsu@kinvolk.io>,
"Serge E. Hallyn" <serge@hallyn.com>
Subject: Re: [PATCH v6 4/5] fuse: Ensure posix acls are translated outside of init_user_ns
Date: Thu, 22 Feb 2018 12:40:18 +0100 [thread overview]
Message-ID: <CAOssrKeNLBeMkMrrCeRBO9Z80zFxCCEygKL3DErnQ9xBoLkH0g@mail.gmail.com> (raw)
In-Reply-To: <20180221202908.17258-4-ebiederm@xmission.com>
On Wed, Feb 21, 2018 at 9:29 PM, Eric W. Biederman
<ebiederm@xmission.com> wrote:
> Ensure the translation happens by failing to read or write
> posix acls when the filesystem has not indicated it supports
> posix acls.
For the first iteration this is fine, but we could convert the raw
xattrs as well, if we later want to, right?
Thanks,
Miklos
>
> This ensures that modern cached posix acl support is available
> and used when dealing with posix acls. This is important
> because only that path has the code to convernt the uids and
> gids in posix acls into the user namespace of a fuse filesystem.
>
> Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
> ---
> fs/fuse/fuse_i.h | 1 +
> fs/fuse/inode.c | 7 +++++++
> fs/fuse/xattr.c | 43 +++++++++++++++++++++++++++++++++++++++++++
> 3 files changed, 51 insertions(+)
>
> diff --git a/fs/fuse/fuse_i.h b/fs/fuse/fuse_i.h
> index 7772e2b4057e..986fa2b043ab 100644
> --- a/fs/fuse/fuse_i.h
> +++ b/fs/fuse/fuse_i.h
> @@ -979,6 +979,7 @@ ssize_t fuse_listxattr(struct dentry *entry, char *list, size_t size);
> int fuse_removexattr(struct inode *inode, const char *name);
> extern const struct xattr_handler *fuse_xattr_handlers[];
> extern const struct xattr_handler *fuse_acl_xattr_handlers[];
> +extern const struct xattr_handler *fuse_no_acl_xattr_handlers[];
>
> struct posix_acl;
> struct posix_acl *fuse_get_acl(struct inode *inode, int type);
> diff --git a/fs/fuse/inode.c b/fs/fuse/inode.c
> index e018dc3999f4..a52cf2019a58 100644
> --- a/fs/fuse/inode.c
> +++ b/fs/fuse/inode.c
> @@ -1097,6 +1097,13 @@ static int fuse_fill_super(struct super_block *sb, void *data, int silent)
> file->f_cred->user_ns != sb->s_user_ns)
> goto err_fput;
>
> + /*
> + * If we are not in the initial user namespace posix
> + * acls must be translated.
> + */
> + if (sb->s_user_ns != &init_user_ns)
> + sb->s_xattr = fuse_no_acl_xattr_handlers;
> +
> fc = kmalloc(sizeof(*fc), GFP_KERNEL);
> err = -ENOMEM;
> if (!fc)
> diff --git a/fs/fuse/xattr.c b/fs/fuse/xattr.c
> index 3caac46b08b0..433717640f78 100644
> --- a/fs/fuse/xattr.c
> +++ b/fs/fuse/xattr.c
> @@ -192,6 +192,26 @@ static int fuse_xattr_set(const struct xattr_handler *handler,
> return fuse_setxattr(inode, name, value, size, flags);
> }
>
> +static bool no_xattr_list(struct dentry *dentry)
> +{
> + return false;
> +}
> +
> +static int no_xattr_get(const struct xattr_handler *handler,
> + struct dentry *dentry, struct inode *inode,
> + const char *name, void *value, size_t size)
> +{
> + return -EOPNOTSUPP;
> +}
> +
> +static int no_xattr_set(const struct xattr_handler *handler,
> + struct dentry *dentry, struct inode *nodee,
> + const char *name, const void *value,
> + size_t size, int flags)
> +{
> + return -EOPNOTSUPP;
> +}
> +
> static const struct xattr_handler fuse_xattr_handler = {
> .prefix = "",
> .get = fuse_xattr_get,
> @@ -209,3 +229,26 @@ const struct xattr_handler *fuse_acl_xattr_handlers[] = {
> &fuse_xattr_handler,
> NULL
> };
> +
> +static const struct xattr_handler fuse_no_acl_access_xattr_handler = {
> + .name = XATTR_NAME_POSIX_ACL_ACCESS,
> + .flags = ACL_TYPE_ACCESS,
> + .list = no_xattr_list,
> + .get = no_xattr_get,
> + .set = no_xattr_set,
> +};
> +
> +static const struct xattr_handler fuse_no_acl_default_xattr_handler = {
> + .name = XATTR_NAME_POSIX_ACL_DEFAULT,
> + .flags = ACL_TYPE_ACCESS,
> + .list = no_xattr_list,
> + .get = no_xattr_get,
> + .set = no_xattr_set,
> +};
> +
> +const struct xattr_handler *fuse_no_acl_xattr_handlers[] = {
> + &fuse_no_acl_access_xattr_handler,
> + &fuse_no_acl_default_xattr_handler,
> + &fuse_xattr_handler,
> + NULL
> +};
> --
> 2.14.1
>
next prev parent reply other threads:[~2018-02-22 11:40 UTC|newest]
Thread overview: 107+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-12-22 14:32 [PATCH v5 00/11] FUSE mounts from non-init user namespaces Dongsu Park
2017-12-22 14:32 ` [PATCH 01/11] block_dev: Support checking inode permissions in lookup_bdev() Dongsu Park
2017-12-22 18:59 ` Coly Li
2017-12-23 12:00 ` Dongsu Park
2017-12-23 3:03 ` Serge E. Hallyn
2017-12-22 14:32 ` [PATCH 02/11] mtd: Check permissions towards mtd block device inode when mounting Dongsu Park
2017-12-22 21:06 ` Richard Weinberger
2017-12-23 12:18 ` Dongsu Park
2017-12-23 12:56 ` Richard Weinberger
2017-12-23 3:05 ` Serge E. Hallyn
2017-12-22 14:32 ` [PATCH 03/11] fs: Allow superblock owner to change ownership of inodes Dongsu Park
2017-12-23 3:17 ` Serge E. Hallyn
2018-01-05 19:24 ` Luis R. Rodriguez
2018-01-09 15:10 ` Dongsu Park
2018-01-09 17:23 ` Luis R. Rodriguez
2018-02-13 13:18 ` Miklos Szeredi
2018-02-16 22:00 ` Eric W. Biederman
2017-12-22 14:32 ` [PATCH 04/11] fs: Don't remove suid for CAP_FSETID for userns root Dongsu Park
2017-12-23 3:26 ` Serge E. Hallyn
2017-12-23 12:38 ` Dongsu Park
2018-02-13 13:37 ` Miklos Szeredi
2017-12-22 14:32 ` [PATCH 05/11] fs: Allow superblock owner to access do_remount_sb() Dongsu Park
2017-12-23 3:30 ` Serge E. Hallyn
2017-12-22 14:32 ` [PATCH 06/11] capabilities: Allow privileged user in s_user_ns to set security.* xattrs Dongsu Park
2017-12-23 3:33 ` Serge E. Hallyn
2017-12-22 14:32 ` [PATCH 07/11] fs: Allow CAP_SYS_ADMIN in s_user_ns to freeze and thaw filesystems Dongsu Park
2017-12-23 3:39 ` Serge E. Hallyn
2018-02-14 12:28 ` Miklos Szeredi
2018-02-19 22:56 ` Eric W. Biederman
2017-12-22 14:32 ` [PATCH 08/11] fuse: Support fuse filesystems outside of init_user_ns Dongsu Park
2017-12-23 3:46 ` Serge E. Hallyn
2018-01-17 10:59 ` Alban Crequy
2018-01-17 14:29 ` Seth Forshee
2018-01-17 18:56 ` Alban Crequy
2018-01-17 19:31 ` Seth Forshee
2018-01-18 10:29 ` Alban Crequy
2018-02-12 15:57 ` Miklos Szeredi
2018-02-12 16:35 ` Eric W. Biederman
2018-02-13 10:20 ` Miklos Szeredi
2018-02-16 21:52 ` Eric W. Biederman
2018-02-20 2:12 ` Eric W. Biederman
2017-12-22 14:32 ` [PATCH 09/11] fuse: Restrict allow_other to the superblock's namespace or a descendant Dongsu Park
2017-12-23 3:50 ` Serge E. Hallyn
2018-02-19 23:16 ` Eric W. Biederman
2017-12-22 14:32 ` [PATCH 10/11] fuse: Allow user namespace mounts Dongsu Park
2017-12-23 3:51 ` Serge E. Hallyn
2018-02-14 13:44 ` Miklos Szeredi
2018-02-15 8:46 ` Miklos Szeredi
2017-12-22 14:32 ` [PATCH 11/11] evm: Don't update hmacs in user ns mounts Dongsu Park
2017-12-23 4:03 ` Serge E. Hallyn
2017-12-24 5:12 ` Mimi Zohar
2017-12-24 5:56 ` Mimi Zohar
2017-12-25 7:05 ` [PATCH v5 00/11] FUSE mounts from non-init user namespaces Eric W. Biederman
2018-01-09 15:05 ` Dongsu Park
2018-01-18 14:58 ` Alban Crequy
2018-02-19 23:09 ` Eric W. Biederman
2018-02-13 11:32 ` Miklos Szeredi
2018-02-16 21:53 ` Eric W. Biederman
2018-02-21 20:24 ` [PATCH v6 0/6] fuse: " Eric W. Biederman
2018-02-21 20:29 ` [PATCH v6 1/5] fuse: Remove the buggy retranslation of pids in fuse_dev_do_read Eric W. Biederman
2018-02-22 10:13 ` Miklos Szeredi
2018-02-22 19:04 ` Eric W. Biederman
2018-02-21 20:29 ` [PATCH v6 2/5] fuse: Fail all requests with invalid uids or gids Eric W. Biederman
2018-02-22 10:26 ` Miklos Szeredi
2018-02-22 18:15 ` Eric W. Biederman
2018-02-21 20:29 ` [PATCH v6 3/5] fuse: Support fuse filesystems outside of init_user_ns Eric W. Biederman
2018-02-21 20:29 ` [PATCH v6 4/5] fuse: Ensure posix acls are translated " Eric W. Biederman
2018-02-22 11:40 ` Miklos Szeredi [this message]
2018-02-22 19:18 ` Eric W. Biederman
2018-02-22 22:50 ` Eric W. Biederman
2018-02-26 7:47 ` Miklos Szeredi
2018-02-26 16:35 ` Eric W. Biederman
2018-02-26 21:51 ` Eric W. Biederman
2018-02-21 20:29 ` [PATCH v6 5/5] fuse: Restrict allow_other to the superblock's namespace or a descendant Eric W. Biederman
2018-02-26 23:52 ` [PATCH v7 0/7] fuse: mounts from non-init user namespaces Eric W. Biederman
2018-02-26 23:52 ` [PATCH v7 1/7] fuse: Remove the buggy retranslation of pids in fuse_dev_do_read Eric W. Biederman
2018-02-26 23:52 ` [PATCH v7 2/7] fuse: Fail all requests with invalid uids or gids Eric W. Biederman
2018-02-26 23:52 ` [PATCH v7 3/7] fs/posix_acl: Document that get_acl respects ACL_DONT_CACHE Eric W. Biederman
2018-02-27 1:13 ` Linus Torvalds
2018-02-27 2:53 ` Eric W. Biederman
2018-02-27 3:14 ` Eric W. Biederman
2018-02-27 3:41 ` Linus Torvalds
2018-03-02 19:53 ` [RFC][PATCH] fs/posix_acl: Update the comments and support lightweight cache skipping Eric W. Biederman
2018-02-27 3:36 ` [PATCH v7 3/7] fs/posix_acl: Document that get_acl respects ACL_DONT_CACHE Linus Torvalds
2018-02-26 23:52 ` [PATCH v7 4/7] fuse: Cache a NULL acl when FUSE_GETXATTR returns -ENOSYS Eric W. Biederman
2018-02-26 23:53 ` [PATCH v7 5/7] fuse: Simplfiy the posix acl handling logic Eric W. Biederman
2018-02-27 9:00 ` Miklos Szeredi
2018-03-02 21:49 ` Eric W. Biederman
2018-02-26 23:53 ` [PATCH v7 6/7] fuse: Support fuse filesystems outside of init_user_ns Eric W. Biederman
2018-02-26 23:53 ` [PATCH v7 7/7] fuse: Restrict allow_other to the superblock's namespace or a descendant Eric W. Biederman
2018-03-02 21:58 ` [PATCH v8 0/6] fuse: mounts from non-init user namespaces Eric W. Biederman
2018-03-02 21:59 ` [PATCH v8 1/6] fs/posix_acl: Update the comments and support lightweight cache skipping Eric W. Biederman
2018-03-05 9:53 ` Miklos Szeredi
2018-03-05 13:53 ` Eric W. Biederman
2018-03-02 21:59 ` [PATCH v8 2/6] fuse: Simplfiy the posix acl handling logic Eric W. Biederman
2018-03-02 21:59 ` [PATCH v8 3/6] fuse: Remove the buggy retranslation of pids in fuse_dev_do_read Eric W. Biederman
2018-03-02 21:59 ` [PATCH v8 4/6] fuse: Fail all requests with invalid uids or gids Eric W. Biederman
2018-03-02 21:59 ` [PATCH v8 5/6] fuse: Support fuse filesystems outside of init_user_ns Eric W. Biederman
2018-03-02 21:59 ` [PATCH v8 6/6] fuse: Restrict allow_other to the superblock's namespace or a descendant Eric W. Biederman
2018-03-08 21:23 ` [PATCH v9 0/4] fuse: mounts from non-init user namespaces Eric W. Biederman
2018-03-08 21:24 ` [PATCH v9 1/4] fuse: Remove the buggy retranslation of pids in fuse_dev_do_read Eric W. Biederman
2018-03-08 21:24 ` [PATCH v9 2/4] fuse: Fail all requests with invalid uids or gids Eric W. Biederman
2018-03-08 21:24 ` [PATCH v9 3/4] fuse: Support fuse filesystems outside of init_user_ns Eric W. Biederman
2018-03-08 21:24 ` [PATCH v9 4/4] fuse: Restrict allow_other to the superblock's namespace or a descendant Eric W. Biederman
2018-03-20 16:25 ` [PATCH v9 0/4] fuse: mounts from non-init user namespaces Miklos Szeredi
2018-03-20 18:27 ` Eric W. Biederman
2018-03-21 8:38 ` Miklos Szeredi
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