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mnt: Modify fs_fully_visible to deal with locked ro nodev and atime 

Ignore an existing mount if the locked readonly, nodev or atime
attributes are less permissive than the desired attributes
of the new mount.

On success ensure the new mount locks all of the same readonly, nodev and
atime attributes as the old mount.

The nosuid and noexec attributes are not checked here as this change
is destined for stable and enforcing those attributes causes a
regression in lxc and libvirt-lxc where those applications will not
start and there are no known executables on sysfs or proc and no known
way to create exectuables without code modifications

Cc: stable@vger.kernel.org
Fixes: e51db73532 ("userns: Better restrictions on when proc and sysfs can be mounted")
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
This commit is contained in:
Eric W. Biederman 2015-05-08 23:49:47 -05:00
parent 1b852bceb0
commit 8c6cf9cc82
1 changed files with 21 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

24
fs/namespace.c
View File

@ -2332,7 +2332,7 @@ unlock:
return err;
}
static bool fs_fully_visible(struct file_system_type *fs_type);
static bool fs_fully_visible(struct file_system_type *fs_type, int *new_mnt_flags);
/*
* create a new mount for userspace and request it to be added into the
@ -2366,7 +2366,7 @@ static int do_new_mount(struct path *path, const char *fstype, int flags,
mnt_flags |= MNT_NODEV | MNT_LOCK_NODEV;
}
if (type->fs_flags & FS_USERNS_VISIBLE) {
if (!fs_fully_visible(type))
if (!fs_fully_visible(type, &mnt_flags))
return -EPERM;
}
}
@ -3170,9 +3170,10 @@ bool current_chrooted(void)
return chrooted;
}
static bool fs_fully_visible(struct file_system_type *type)
static bool fs_fully_visible(struct file_system_type *type, int *new_mnt_flags)
{
struct mnt_namespace *ns = current->nsproxy->mnt_ns;
int new_flags = *new_mnt_flags;
struct mount *mnt;
bool visible = false;
@ -3191,6 +3192,19 @@ static bool fs_fully_visible(struct file_system_type *type)
if (mnt->mnt.mnt_root != mnt->mnt.mnt_sb->s_root)
continue;
/* Verify the mount flags are equal to or more permissive
* than the proposed new mount.
*/
if ((mnt->mnt.mnt_flags & MNT_LOCK_READONLY) &&
!(new_flags & MNT_READONLY))
continue;
if ((mnt->mnt.mnt_flags & MNT_LOCK_NODEV) &&
!(new_flags & MNT_NODEV))
continue;
if ((mnt->mnt.mnt_flags & MNT_LOCK_ATIME) &&
((mnt->mnt.mnt_flags & MNT_ATIME_MASK) != (new_flags & MNT_ATIME_MASK)))
continue;
/* This mount is not fully visible if there are any child mounts
* that cover anything except for empty directories.
*/
@ -3201,6 +3215,10 @@ static bool fs_fully_visible(struct file_system_type *type)
if (inode->i_nlink > 2)
goto next;
}
/* Preserve the locked attributes */
*new_mnt_flags |= mnt->mnt.mnt_flags & (MNT_LOCK_READONLY | \
MNT_LOCK_NODEV | \
MNT_LOCK_ATIME);
visible = true;
goto found;
next: ;