prctl_set_mm: refactor checks from validate_prctl_map

Despite comment of validate_prctl_map claims there are no capability
checks, it is not completely true since commit 4d28df6152aa ("prctl: Allow
local CAP_SYS_ADMIN changing exe_file").  Extract the check out of the
function and make the function perform purely arithmetic checks.

This patch should not change any behavior, it is mere refactoring for
following patch.

[[email protected]: coding style fixes]
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Michal Koutný <[email protected]>
Reviewed-by: Kirill Tkhai <[email protected]>
Reviewed-by: Cyrill Gorcunov <[email protected]>
Cc: Kirill Tkhai <[email protected]>
Cc: Laurent Dufour <[email protected]>
Cc: Mateusz Guzik <[email protected]>
Cc: Michal Hocko <[email protected]>
Cc: Yang Shi <[email protected]>
Cc: Konstantin Khlebnikov <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

0 files changed, 0 insertions, 0 deletions