Date: Wed, 31 May 2017 00:10:17 -0400 From: Matt Brown <matt@...tt.com> To: James Morris <jmorris@...ei.org>, Boris Lukashev <blukashev@...pervictus.com> Cc: Alan Cox <gnomes@...rguk.ukuu.org.uk>, Greg KH <gregkh@...uxfoundation.org>, "Serge E. Hallyn" <serge@...lyn.com>, Kees Cook <keescook@...omium.org>, kernel-hardening@...ts.openwall.com, linux-security-module <linux-security-module@...r.kernel.org>, linux-kernel <linux-kernel@...r.kernel.org> Subject: Re: Re: [PATCH v7 2/2] security: tty: make TIOCSTI ioctl require CAP_SYS_ADMIN On 05/30/2017 10:48 PM, James Morris wrote: > On Mon, 29 May 2017, Boris Lukashev wrote: > >> With all due respect sir, i believe your review falls short of the >> purpose of this effort - to harden the kernel against flaws in >> userspace. > > Which effort? Kernel self protection is about protecting against flaws in > the kernel. > > See: > https://kernsec.org/wiki/index.php/Kernel_Self_Protection_Project > > "This project starts with the premise that kernel bugs have a very long > lifetime, and that the kernel must be designed in ways to protect against > these flaws." > > We need to avoid conflating: > > - hardening the kernel against attack; and > - modifying the kernel to try and harden userspace. > > These patches are the latter, and the case for them is not as > straightforward. > > > - James > I agree that these patches aren't kernel self protection and I don't believe I have claimed they are such a thing. These patches I'm presenting are more akin to ptrace protections that are found in Yama.
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