Fixing ptrace vs exec vs userns interactions

With everyone heading to Kernel Summit and Plumbers I put this set of
patches down temporarily. Now is the time to take it back up and to
make certain I am not missing something stupid in this set of patches.

There are other issues in this area as well, but these are the pieces that I can see clearly, and have tested fixes for.

Andy as to your criticism about using strace sudo I can't possibly see how that is effective or useful. Under strace sudo won't run as root today, and will immediately exit because it is not root. Furthermore the only place I can find non-readable executables is people hardening suid root executables so they are more difficult to trace. So I definitely think we should honor the unix permissions and people's expressed wishes.

Eric W. Biederman (3):
ptrace: Capture the ptracer's creds not PT_PTRACE_CAP
exec: Don't allow ptracing an exec of an unreadable file
exec: Ensure mm->user_ns contains the execed files

 fs/exec.c                  | 26 +++++++++++++++++++++++---
 include/linux/capability.h |  2 ++
 include/linux/ptrace.h     |  1 -
 include/linux/sched.h      |  1 +
 kernel/capability.c        | 36 ++++++++++++++++++++++++++++++++++--
 kernel/ptrace.c            | 12 +++++++-----
 6 files changed, 67 insertions(+), 11 deletions(-)

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