From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from bedivere.hansenpartnership.com ([66.63.167.143]:57448 "EHLO bedivere.hansenpartnership.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752900AbcDSM3m (ORCPT ); Tue, 19 Apr 2016 08:29:42 -0400 Message-ID: <1461068980.2435.6.camel@HansenPartnership.com> Subject: [Patch resend v3 3/3] binfmt_misc: add F option description to documentation From: James Bottomley To: containers@lists.linux-foundation.org, linux-fsdevel Cc: Al Viro , Jan Kara Date: Tue, 19 Apr 2016 08:29:40 -0400 In-Reply-To: <1461068670.2435.0.camel@HansenPartnership.com> References: <1461068670.2435.0.camel@HansenPartnership.com> Content-Type: text/plain; charset="UTF-8" Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Sender: linux-fsdevel-owner@vger.kernel.org List-ID: Signed-off-by: James Bottomley --- Documentation/binfmt_misc.txt | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/Documentation/binfmt_misc.txt b/Documentation/binfmt_misc.txt index 6b1de70..ec83bbc 100644 --- a/Documentation/binfmt_misc.txt +++ b/Documentation/binfmt_misc.txt @@ -66,6 +66,13 @@ Here is what the fields mean: This feature should be used with care as the interpreter will run with root permissions when a setuid binary owned by root is run with binfmt_misc. + 'F' - fix binary. The usual behaviour of binfmt_misc is to spawn the + binary lazily when the misc format file is invoked. However, + this doesn't work very well in the face of mount namespaces and + changeroots, so the F mode opens the binary as soon as the + emulation is installed and uses the opened image to spawn the + emulator, meaning it is always available once installed, + regardless of how the environment changes. There are some restrictions: -- 2.6.6