[PATCH]Introduce generalized hooks for getting and setting inode secctx.

[Casey Schaufler]

--- "David P. Quigley" <dpquigl at tycho.nsa.gov> wrote:

> 
> This patch set does two things. First it factors the section of vfs_setxattr
> that does the real work into a helper function. This allows LSMs the ability 
> to set the xattrs they need without hitting the permission check inside
> vfs_setxattr each time. Second it introduces three new hooks
> inode_{get,set}secctx, and inode_notifysecctx.
> 
> The first hook retreives all security information the LSM feels is relavent
> in
> the form of a security context. The second hook given this context can sets
> both the in-core and on-disk store for the particular inode. The third hook
> is
> used to notify the in-core inode of a change to it's security state.
> 
> This is the fourth revision of this patch set which takes into account
> concerns by Casey Schaufler, and Christop Hellwig.
> 
> fs/xattr.c               |   57 ++++++++++++++++++++++++++++++++++-----------
> include/linux/security.h |   50 ++++++++++++++++++++++++++++++++++++++++
> include/linux/xattr.h    |    1 +
> security/dummy.c         |   17 +++++++++++++
> security/security.c      |   18 ++++++++++++++
> security/selinux/hooks.c |   28 ++++++++++++++++++++++
> 6 files changed, 157 insertions(+), 14 deletions(-)

These patches don't appear to cause any harm, but I remain
unconvinced regarding the approach you're taking.


Casey Schaufler
casey at schaufler-ca.com