tree 6b9e500f4f9fa624da3b6bd28d6d161a615a3a63
parent e68b75a027bb94066576139ee33676264f867b87
author Eric Paris <eparis@redhat.com> 1225255332 +1100
committer James Morris <jmorris@namei.org> 1226401284 +1100

Capabilities: BUG when an invalid capability is requested

If an invalid (large) capability is requested the capabilities system
may panic as it is dereferencing an array of fixed (short) length.  Its
possible (and actually often happens) that the capability system
accidentally stumbled into a valid memory region but it also regularly
happens that it hits invalid memory and BUGs.  If such an operation does
get past cap_capable then the selinux system is sure to have problems as
it already does a (simple) validity check and BUG.  This is known to
happen by the broken and buggy firegl driver.

This patch cleanly checks all capable calls and BUG if a call is for an
invalid capability.  This will likely break the firegl driver for some
situations, but it is the right thing to do.  Garbage into a security
system gets you killed/bugged

Signed-off-by: Eric Paris <eparis@redhat.com>
Acked-by: Arjan van de Ven <arjan@linux.intel.com>
Acked-by: Serge Hallyn <serue@us.ibm.com>
Acked-by: Andrew G. Morgan <morgan@kernel.org>
Signed-off-by: James Morris <jmorris@namei.org>