Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.kernel > #1226595

Re: [PATCH v3 2/7] userns: Simpilify MNT_NODEV handling.

Show all headers | View raw

On Wed, Sep 16, 2015 at 1:02 PM, Seth Forshee
<seth.forshee@canonical.com> wrote:
> From: "Eric W. Biederman" <ebiederm@xmission.com>
>
> - Consolidate the testing if a device node may be opened in a new
>   function may_open_dev.
>
> - Move the check for allowing access to device nodes on filesystems
>   not mounted in the initial user namespace from mount time to open
>   time and include it in may_open_dev.
>
> This set of changes removes the implicit adding of MNT_NODEV which
> simplifies the logic in fs/namespace.c and removes a potentially
> problematic user visible difference in how normal and unprivileged
> mount namespaces work.
>
> Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>

> -               /* Only in special cases allow devices from mounts
> -                * created outside the initial user namespace.
> -                */
> -               if (!(type->fs_flags & FS_USERNS_DEV_MOUNT)) {
> -                       flags |= MS_NODEV;
> -                       mnt_flags |= MNT_NODEV | MNT_LOCK_NODEV;
> -               }

This is an ABI change.  It's probably okay, but I think the commit
message should make it clear what's happening.


--Andy
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

Back to linux.kernel | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

[PATCH v3 0/7] Initial support for user namespace owned mounts Seth Forshee <seth.forshee@canonical.com> - 2015-09-16 22:10 +0200
  [PATCH v3 1/7] fs: Add user namesapace member to struct super_block Seth Forshee <seth.forshee@canonical.com> - 2015-09-16 22:10 +0200
  [PATCH v3 6/7] Smack: Add support for unprivileged mounts from user namespaces Seth Forshee <seth.forshee@canonical.com> - 2015-09-16 22:10 +0200
    Re: [PATCH v3 6/7] Smack: Add support for unprivileged mounts from  user namespaces Casey Schaufler <casey@schaufler-ca.com> - 2015-09-16 22:40 +0200
      Re: [PATCH v3 6/7] Smack: Add support for unprivileged mounts from  user namespaces Seth Forshee <seth.forshee@canonical.com> - 2015-09-17 15:00 +0200
  [PATCH v3 2/7] userns: Simpilify MNT_NODEV handling. Seth Forshee <seth.forshee@canonical.com> - 2015-09-16 22:10 +0200
    Re: [PATCH v3 2/7] userns: Simpilify MNT_NODEV handling. Andy Lutomirski <luto@amacapital.net> - 2015-09-17 02:30 +0200
      Re: [PATCH v3 2/7] userns: Simpilify MNT_NODEV handling. ebiederm@xmission.com (Eric W. Biederman) - 2015-09-17 03:10 +0200
        Re: [PATCH v3 2/7] userns: Simpilify MNT_NODEV handling. Andy Lutomirski <luto@amacapital.net> - 2015-09-18 00:20 +0200
  [PATCH v3 3/7] fs: Verify access of user towards block device file when mounting Seth Forshee <seth.forshee@canonical.com> - 2015-09-16 22:10 +0200
  [PATCH v3 7/7] selinux: Add support for unprivileged mounts from user namespaces Seth Forshee <seth.forshee@canonical.com> - 2015-09-16 22:10 +0200

csiph-web