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Message-ID: <20170221125123.076be7e9@xeon-e3> Date: Tue, 21 Feb 2017 12:51:23 -0800 From: Stephen Hemminger <stephen@...workplumber.org> To: Kees Cook <keescook@...omium.org> Cc: Eddie Kovsky <ewk@...ovsky.org>, Jessica Yu <jeyu@...hat.com>, Rusty Russell <rusty@...tcorp.com.au>, KY Srinivasan <kys@...rosoft.com>, Haiyang Zhang <haiyangz@...rosoft.com>, Stephen Hemminger <sthemmin@...rosoft.com>, LKML <linux-kernel@...r.kernel.org>, "kernel-hardening@...ts.openwall.com" <kernel-hardening@...ts.openwall.com> Subject: Re: [PATCH v2 1/3] module: verify address is read-only On Tue, 21 Feb 2017 12:32:16 -0800 Kees Cook <keescook@...omium.org> wrote: > On Mon, Feb 20, 2017 at 9:14 AM, Stephen Hemminger > <stephen@...workplumber.org> wrote: > > On Fri, 17 Feb 2017 21:58:42 -0800 > > "Eddie Kovsky" <ewk@...ovsky.org> wrote: > > > >> Implement a mechanism to check if a module's address is in > >> the rodata or ro_after_init sections. It mimics the exsiting functions > >> that test if an address is inside a module's text section. > >> > >> Signed-off-by: Eddie Kovsky <ewk@...ovsky.org> > > > > I don't see the point of this for many of the hyper-v functions. > > They are only called from a small number of places, and this can be validated > > by code inspection. Adding this seems just seems to be code bloat to me. > > I think it has value in that it effectively blocks any way for > non-ro_after_init structures from being passed into these functions. > Since there are so few callers now, it's the perfect place to add > this. > > -Kees > Maybe for a more used API, but for such a corner case it is code bloat.
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