linux-kernel - Re: [PATCH v8] seccomp, ptrace: add support for dumping seccomp filters

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Message-ID: <20151020220814.GA3232@hopstrocity>
Date:	Tue, 20 Oct 2015 16:08:14 -0600
From:	Tycho Andersen <tycho.andersen@...onical.com>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Kees Cook <keescook@...omium.org>,
	Alexei Starovoitov <ast@...nel.org>,
	Will Drewry <wad@...omium.org>,
	Andy Lutomirski <luto@...capital.net>,
	Pavel Emelyanov <xemul@...allels.com>,
	"Serge E. Hallyn" <serge.hallyn@...ntu.com>,
	Daniel Borkmann <daniel@...earbox.net>,
	linux-kernel@...r.kernel.org, linux-api@...r.kernel.org
Subject: Re: [PATCH v8] seccomp, ptrace: add support for dumping seccomp
 filters

Hi Kees, Oleg,

On Tue, Oct 20, 2015 at 10:20:24PM +0200, Oleg Nesterov wrote:
>
> No, you can't do copy_to_user() from atomic context. You need to pin this
> filter, drop the lock/irq, then copy_to_user().

Attached is a patch which addresses this.

Tycho

View attachment "0001-seccomp-ptrace-add-support-for-dumping-seccomp-filte.patch" of type "text/x-diff" (6354 bytes)