Re: [PATCH] mm/mincore: allow for making sys_mincore() privileged

From: Josh Snyder
Date: Wed Jan 16 2019 - 02:52:43 EST

On Tue, Jan 15, 2019 at 10:34 PM Dominique Martinet <asmadeus@xxxxxxxxxxxxx>
> There is a difference with your previous patch though, that used to list no
> page in core when it didn't know; this patch lists pages as in core when it
> refuses to tell. I don't think that's very important, though.

Is there a reason not to return -EPERM in this case?

> If anything, the 0400 user-owner file might be a problem in some edge
> case (e.g. if you're preloading git directories, many objects are 0444);
> should we *also* check ownership?...

Yes, this seems valuable. Some databases with immutable files (e.g. git, as
you've mentioned) conceivably operate this way.