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[198.145.29.99]) by mx.google.com with ESMTPS id q4si2521199pfq.56.2019.02.06.08.24.00 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 06 Feb 2019 08:24:00 -0800 (PST) Received-SPF: pass (google.com: domain of srs0=f26y=qn=goodmis.org=rostedt@kernel.org designates 198.145.29.99 as permitted sender) client-ip=198.145.29.99; Authentication-Results: mx.google.com; spf=pass (google.com: domain of srs0=f26y=qn=goodmis.org=rostedt@kernel.org designates 198.145.29.99 as permitted sender) smtp.mailfrom="SRS0=f26Y=QN=goodmis.org=rostedt@kernel.org" Received: from gandalf.local.home (cpe-66-24-58-225.stny.res.rr.com [66.24.58.225]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id C72892175B; Wed, 6 Feb 2019 16:23:57 +0000 (UTC) Date: Wed, 6 Feb 2019 11:23:56 -0500 From: Steven Rostedt To: Rick Edgecombe Cc: Andy Lutomirski , Ingo Molnar , linux-kernel@vger.kernel.org, x86@kernel.org, hpa@zytor.com, Thomas Gleixner , Borislav Petkov , Nadav Amit , Dave Hansen , Peter Zijlstra , linux_dti@icloud.com, linux-integrity@vger.kernel.org, linux-security-module@vger.kernel.org, akpm@linux-foundation.org, kernel-hardening@lists.openwall.com, linux-mm@kvack.org, will.deacon@arm.com, ard.biesheuvel@linaro.org, kristen@linux.intel.com, deneen.t.dock@intel.com, Rusty Russell , Masami Hiramatsu , Daniel Borkmann , Alexei Starovoitov , Jessica Yu , "Paul E . McKenney" Subject: Re: [PATCH 16/17] Plug in new special vfree flag Message-ID: <20190206112356.64cc5f0d@gandalf.local.home> In-Reply-To: <20190117003259.23141-17-rick.p.edgecombe@intel.com> References: <20190117003259.23141-1-rick.p.edgecombe@intel.com> <20190117003259.23141-17-rick.p.edgecombe@intel.com> X-Mailer: Claws Mail 3.16.0 (GTK+ 2.24.32; x86_64-pc-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Wed, 16 Jan 2019 16:32:58 -0800 Rick Edgecombe 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 > Cc: Masami Hiramatsu > Cc: Daniel Borkmann > Cc: Alexei Starovoitov > Cc: Jessica Yu > Cc: Steven Rostedt > Cc: Paul E. McKenney > Signed-off-by: Rick Edgecombe > --- > arch/x86/kernel/ftrace.c | 6 +-- For the ftrace code. Acked-by: Steven Rostedt (VMware) -- 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(-) >