When running a 64-bit kernel and receiving prctls from a 32-bit
userspace, the "-1" used as an unsigned long will end up being
misdetected. The kernel is looking for 0xffffffffffffffff instead of
0xffffffff. Since prctl lacks a distinct compat interface, Yama needs
to handle this translation itself. As such, support either value as
meaning PR_SET_PTRACER_ANY, to avoid breaking the ABI for 64-bit.
Signed-off-by: NKees Cook <keescook@chromium.org>
Acked-by: NJohn Johansen <john.johansen@canonical.com>
Cc: stable@vger.kernel.org
Signed-off-by: NJames Morris <james.l.morris@oracle.com>