Hi all, I was auditing the code base when I noticed that the xfs_name_dotdot variable is both global and mutable. In theory, someone could change the contents of that variable (either through misuse or by exploiting a kernel bug) which would then break the directory code, so let's shut down that attack surface by making it const. If you're going to start using this mess, you probably ought to just pull from my git trees, which are linked below. This is an extraordinary way to destroy everything. Enjoy! Comments and questions are, as always, welcome. --D kernel git tree: https://git.kernel.org/cgit/linux/kernel/git/djwong/xfs-linux.git/log/?h=constify-dotdot-5.18 --- fs/xfs/libxfs/xfs_dir2.c | 18 +++++++++++------- fs/xfs/libxfs/xfs_dir2.h | 6 +++--- fs/xfs/libxfs/xfs_dir2_priv.h | 5 +++-- fs/xfs/scrub/parent.c | 6 ++++-- fs/xfs/xfs_export.c | 3 ++- 5 files changed, 23 insertions(+), 15 deletions(-)
