On Fri, Aug 11, 2017 at 3:03 AM, Christoph Hellwig <h...@infradead.org> wrote:
> On Mon, Aug 07, 2017 at 05:24:08PM -0700, Dan Williams wrote:
>> Does sys_mmap() reject unknown flag values today? I'm either not
>> looking in the right place or it's missing and we'll need some
>> interface/mechanism to check if MAP_SYNC is honored.
>
> It doesn't seem to reject unknown flags.
>
> The lack of flags checking strikes back once more, sighṫ.

How about MAP_SYNC == (MAP_SHARED|MAP_PRIVATE)? On older kernels that
should get -EINVAL, and on new kernels it means SYNC+SHARED.
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