Date: Wed, 29 Nov 2017 10:53:41 -0800 From: Linus Torvalds <torvalds@...ux-foundation.org> To: Kees Cook <keescook@...omium.org> Cc: Geo Kozey <geokozey@...lfence.com>, LSM List <linux-security-module@...r.kernel.org>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, "kernel-hardening@...ts.openwall.com" <kernel-hardening@...ts.openwall.com> Subject: Re: Re: [PATCH v5 next 5/5] net: modules: use request_module_cap() to load 'netdev-%s' modules On Wed, Nov 29, 2017 at 10:46 AM, Linus Torvalds <torvalds@...ux-foundation.org> wrote: > > So the module flag is technically easy to add, and it's technically > easy to read at module loading time, but I suspect that it's actually > annoyingly hard to pass the original request_module() capability > information around to where we actually read the module. One possibly interesting approach would be to run the usermode helper not as root, but with the credentials of the request_module() caller. That's arguably the right thing to do (in that request_module() would never do anything that the user wouldn't be able to do on their own) and probably what we should have done originally, but while it feels like a nice solution I suspect it would break pretty much every distro out there. Because they all expect modprobe/kmod to be called as root in the original init-namespace. Linus
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