prctl.2: Document PR_SET_PTRACER

Document the Yama LSM's prctl handler that allows processes to
declare ptrace restriction exception relationships via
PR_SET_PTRACER.

Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
1 file changed