[Devel] [PATCH rh7 0/4] overlayfs: missing detection of hardlinks in vfs_rename() on overlayfs

[Maxim Patlasov]

As rightly explained in CVE-2016-6198
(https://bugzilla.redhat.com/show_bug.cgi?id=1355654):

> It was found that the vfs_rename() function did not detect hard links on
> overlayfs. A local, unprivileged user could use the rename syscall on
> overlayfs on top of xfs to crash the system.

The series backport necessary bits from upstream to fix it.

---

Maxim Patlasov (4):
      VFS: Introduce inode-getting helpers for layered/unioned fs environments
      overlayfs: introduce d_select_inode dentry operation
      vfs: add vfs_select_inode() helper
      vfs: rename: check backing inode being equal


 fs/dcache.c              |    5 +++
 fs/namei.c               |    6 +++-
 fs/overlayfs/inode.c     |   15 ++++++++++
 fs/overlayfs/overlayfs.h |    1 +
 fs/overlayfs/super.c     |    2 +
 include/linux/dcache.h   |   69 ++++++++++++++++++++++++++++++++++++++++++++++
 6 files changed, 96 insertions(+), 2 deletions(-)

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