On Tue, 2017-05-30 at 19:00 -0400, Matt Brown wrote:

On 5/30/17 4:22 PM, Daniel Micay wrote:

quoted

quoted

Thanks, I didn't know that android was doing this. I still think
this
feature
is worthwhile for people to be able to harden their systems
against
this attack
vector without having to implement a MAC.

Since there's a capable LSM hook for ioctl already, it means it
could go
in Yama with ptrace_scope but core kernel code would still need to
be
changed to track the owning tty. I think Yama vs. core kernel
shouldn't
matter much anymore due to stackable LSMs.

What does everyone think about a v8 that moves this feature under Yama
and uses
the file_ioctl LSM hook?

It would only make a difference if it could be fully contained there, as
in not depending on tracking the tty owner.
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