linux-kernel - Re: [PATCH 16/17] Plug in new special vfree flag

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Message-ID: <20190206112356.64cc5f0d@gandalf.local.home>
Date:   Wed, 6 Feb 2019 11:23:56 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Rick Edgecombe <rick.p.edgecombe@...el.com>
Cc:     Andy Lutomirski <luto@...nel.org>, Ingo Molnar <mingo@...hat.com>,
        linux-kernel@...r.kernel.org, x86@...nel.org, hpa@...or.com,
        Thomas Gleixner <tglx@...utronix.de>,
        Borislav Petkov <bp@...en8.de>,
        Nadav Amit <nadav.amit@...il.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Peter Zijlstra <peterz@...radead.org>, linux_dti@...oud.com,
        linux-integrity@...r.kernel.org,
        linux-security-module@...r.kernel.org, akpm@...ux-foundation.org,
        kernel-hardening@...ts.openwall.com, linux-mm@...ck.org,
        will.deacon@....com, ard.biesheuvel@...aro.org,
        kristen@...ux.intel.com, deneen.t.dock@...el.com,
        Rusty Russell <rusty@...tcorp.com.au>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Alexei Starovoitov <ast@...nel.org>,
        Jessica Yu <jeyu@...nel.org>,
        "Paul E . McKenney" <paulmck@...ux.ibm.com>
Subject: Re: [PATCH 16/17] Plug in new special vfree flag

On Wed, 16 Jan 2019 16:32:58 -0800
Rick Edgecombe <rick.p.edgecombe@...el.com> wrote:

> Add new flag for handling freeing of special permissioned memory in vmalloc
> and remove places where memory was set RW before freeing which is no longer
> needed.
> 
> In kprobes, bpf and ftrace this just adds the flag, and removes the now
> unneeded set_memory_ calls before calling vfree.
> 
> In modules, the freeing of init sections is moved to a work queue, since
> freeing of RO memory is not supported in an interrupt by vmalloc.
> Instead of call_rcu, it now uses synchronize_rcu() in the work queue.
> 
> Cc: Rusty Russell <rusty@...tcorp.com.au>
> Cc: Masami Hiramatsu <mhiramat@...nel.org>
> Cc: Daniel Borkmann <daniel@...earbox.net>
> Cc: Alexei Starovoitov <ast@...nel.org>
> Cc: Jessica Yu <jeyu@...nel.org>
> Cc: Steven Rostedt <rostedt@...dmis.org>
> Cc: Paul E. McKenney <paulmck@...ux.ibm.com>
> Signed-off-by: Rick Edgecombe <rick.p.edgecombe@...el.com>
> ---
>  arch/x86/kernel/ftrace.c       |  6 +--

For the ftrace code.

Acked-by: Steven Rostedt (VMware) <rostedt@...dmis.org>

-- Steve

>  arch/x86/kernel/kprobes/core.c |  7 +---
>  include/linux/filter.h         | 16 ++-----
>  kernel/bpf/core.c              |  1 -
>  kernel/module.c                | 77 +++++++++++++++++-----------------
>  5 files changed, 45 insertions(+), 62 deletions(-)
>