This is a note to let you know that I've just added the patch titled
mnt: Prevent pivot_root from creating a loop in the mount tree
to the 3.17-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
mnt-prevent-pivot_root-from-creating-a-loop-in-the-mount-tree.patch
and it can be found in the queue-3.17 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 0d0826019e529f21c84687521d03f60cd241ca7d Mon Sep 17 00:00:00 2001
From: "Eric W. Biederman" <ebiederm@xxxxxxxxxxxx>
Date: Wed, 8 Oct 2014 10:42:27 -0700
Subject: mnt: Prevent pivot_root from creating a loop in the mount tree
From: "Eric W. Biederman" <ebiederm@xxxxxxxxxxxx>
commit 0d0826019e529f21c84687521d03f60cd241ca7d upstream.
Andy Lutomirski recently demonstrated that when chroot is used to set
the root path below the path for the new ``root'' passed to pivot_root
the pivot_root system call succeeds and leaks mounts.
In examining the code I see that starting with a new root that is
below the current root in the mount tree will result in a loop in the
mount tree after the mounts are detached and then reattached to one
another. Resulting in all kinds of ugliness including a leak of that
mounts involved in the leak of the mount loop.
Prevent this problem by ensuring that the new mount is reachable from
the current root of the mount tree.
[Added stable cc. Fixes CVE-2014-7970. --Andy]
Reported-by: Andy Lutomirski <luto@xxxxxxxxxxxxxx>
Reviewed-by: Andy Lutomirski <luto@xxxxxxxxxxxxxx>
Link: http://lkml.kernel.org/r/87bnpmihks.fsf@xxxxxxxxxxxxxxxxxxxxx
Signed-off-by: "Eric W. Biederman" <ebiederm@xxxxxxxxxxxx>
Signed-off-by: Andy Lutomirski <luto@xxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/namespace.c | 3 +++
1 file changed, 3 insertions(+)
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -2822,6 +2822,9 @@ SYSCALL_DEFINE2(pivot_root, const char _
/* make sure we can reach put_old from new_root */
if (!is_path_reachable(old_mnt, old.dentry, &new))
goto out4;
+ /* make certain new is below the root */
+ if (!is_path_reachable(new_mnt, new.dentry, &root))
+ goto out4;
root_mp->m_count++; /* pin it so it won't go away */
lock_mount_hash();
detach_mnt(new_mnt, &parent_path);
Patches currently in stable-queue which might be from ebiederm@xxxxxxxxxxxx are
queue-3.17/mnt-prevent-pivot_root-from-creating-a-loop-in-the-mount-tree.patch
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