Build Update for lxc/lxc
-------------------------------------
Build: #5442
Status: Passed
Duration: 1 min and 54 secs
Commit: 8d6ee0c (stable-3.0)
Author: Christian Brauner
Message: autodev: adapt to changes in Linux 4.18
Starting with commit
55956b59df33 ("vfs: Allow userns root to call mknod on owned filesystems.")
Linux will allow mknod() in user namespaces for userns root if CAP_MKNOD is
available.
However, these device nodes are useless since
static struct super_block *alloc_super(struct file_system_type *type, int flags,
struct user_namespace *user_ns)
{
/* <snip> */
if (s->s_user_ns != &init_user_ns)
s->s_iflags |= SB_I_NODEV;
/* <snip> */
}
will set the SB_I_NODEV flag on the filesystem. When a device node created in
non-init userns is open()ed the call chain will hit:
bool may_open_dev(const struct path *path)
{
return !(path->mnt->mnt_flags & MNT_NODEV) &&
!(path->mnt->mnt_sb->s_iflags & SB_I_NODEV);
}
which will cause an EPERM because the device node is located on an fs
owned by non-init-userns and thus doesn't grant access to device nodes due to
SB_I_NODEV.
The solution is straightforward. Unless you're real root you should bind-mount
device nodes.
Signed-off-by: Christian Brauner <[email protected]>
View the changeset:
https://github.com/lxc/lxc/compare/58465a03436e...8d6ee0ca9df0
View the full build log and details:
https://travis-ci.org/lxc/lxc/builds/398325446?utm_source=email&utm_medium=notification
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