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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(-)
>
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