linux-kernel - Re: [PATCH RFC] mm: add MAP_EXCLUSIVE to create exclusive user mappings

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Message-ID: <20a7ae04-877a-692e-0b8d-e1baee511090@intel.com>
Date:   Wed, 30 Oct 2019 11:01:53 -0700
From:   Dave Hansen <dave.hansen@...el.com>
To:     "Edgecombe, Rick P" <rick.p.edgecombe@...el.com>,
        "peterz@...radead.org" <peterz@...radead.org>
Cc:     "adobriyan@...il.com" <adobriyan@...il.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "rppt@...nel.org" <rppt@...nel.org>,
        "rostedt@...dmis.org" <rostedt@...dmis.org>,
        "jejb@...ux.ibm.com" <jejb@...ux.ibm.com>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "dave.hansen@...ux.intel.com" <dave.hansen@...ux.intel.com>,
        "linux-api@...r.kernel.org" <linux-api@...r.kernel.org>,
        "x86@...nel.org" <x86@...nel.org>,
        "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
        "hpa@...or.com" <hpa@...or.com>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "luto@...nel.org" <luto@...nel.org>,
        "kirill@...temov.name" <kirill@...temov.name>,
        "bp@...en8.de" <bp@...en8.de>,
        "rppt@...ux.ibm.com" <rppt@...ux.ibm.com>,
        "arnd@...db.de" <arnd@...db.de>
Subject: Re: [PATCH RFC] mm: add MAP_EXCLUSIVE to create exclusive user
 mappings

On 10/30/19 10:58 AM, Dave Hansen wrote:
> Modules also require privilege.

IMNHO, if BPF is fracturing large swaths the direct map with no
privilege, it's only a matter of time until it starts to cause problems.
 The fact that we do it today is only evidence that we have a ticking
time bomb, not that it's OK.