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Message-ID: <CAHk-=wh05FniF0xJYqcFrmGeCvOJUqR0UL4jTC-_LvpsfNCkNw@mail.gmail.com>
Date: Mon, 10 Feb 2020 09:46:26 -0800
From: Linus Torvalds <torvalds@...ux-foundation.org>
To: Alexey Gladkov <gladkov.alexey@...il.com>
Cc: LKML <linux-kernel@...r.kernel.org>,
Kernel Hardening <kernel-hardening@...ts.openwall.com>, Linux API <linux-api@...r.kernel.org>,
Linux FS Devel <linux-fsdevel@...r.kernel.org>,
Linux Security Module <linux-security-module@...r.kernel.org>,
Akinobu Mita <akinobu.mita@...il.com>, Alexander Viro <viro@...iv.linux.org.uk>,
Alexey Dobriyan <adobriyan@...il.com>, Andrew Morton <akpm@...ux-foundation.org>,
Andy Lutomirski <luto@...nel.org>, Daniel Micay <danielmicay@...il.com>,
Djalal Harouni <tixxdz@...il.com>, "Dmitry V . Levin" <ldv@...linux.org>,
"Eric W . Biederman" <ebiederm@...ssion.com>, Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Ingo Molnar <mingo@...nel.org>, "J . Bruce Fields" <bfields@...ldses.org>,
Jeff Layton <jlayton@...chiereds.net>, Jonathan Corbet <corbet@....net>,
Kees Cook <keescook@...omium.org>, Oleg Nesterov <oleg@...hat.com>,
Solar Designer <solar@...nwall.com>
Subject: Re: [PATCH v8 07/11] proc: flush task dcache entries from all procfs instances
On Mon, Feb 10, 2020 at 7:06 AM Alexey Gladkov <gladkov.alexey@...il.com> wrote:
>
> This allows to flush dcache entries of a task on multiple procfs mounts
> per pid namespace.
>
> The RCU lock is used because the number of reads at the task exit time
> is much larger than the number of procfs mounts.
Ok, this looks better to me than the previous version.
But that may be the "pee-in-the-snow" effect, and I _really_ want
others to take a good look at the whole series.
The right people seem to be cc'd, but this is pretty core, and /proc
has a tendency to cause interesting issues because of how it's
involved in a lot of areas indirectly.
Al, Oleg, Andy, Eric?
Linus
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