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Message-ID: <87bm5qovbb.fsf@oldenburg2.str.redhat.com> Date: Thu, 13 Dec 2018 06:22:00 +0100 From: Florian Weimer <fweimer@...hat.com> To: Matthew Wilcox <willy@...radead.org> Cc: Mickaël Salaün <mic@...ikod.net>, linux-kernel@...r.kernel.org, Al Viro <viro@...iv.linux.org.uk>, James Morris <jmorris@...ei.org>, Jonathan Corbet <corbet@....net>, Kees Cook <keescook@...omium.org>, Matthew Garrett <mjg59@...gle.com>, Michael Kerrisk <mtk.manpages@...il.com>, Mickaël Salaün <mickael.salaun@....gouv.fr>, Mimi Zohar <zohar@...ux.ibm.com>, Philippe Trébuchet <philippe.trebuchet@....gouv.fr>, Shuah Khan <shuah@...nel.org>, Thibaut Sautereau <thibaut.sautereau@....gouv.fr>, Vincent Strubel <vincent.strubel@....gouv.fr>, Yves-Alexis Perez <yves-alexis.perez@....gouv.fr>, kernel-hardening@...ts.openwall.com, linux-api@...r.kernel.org, linux-security-module@...r.kernel.org, linux-fsdevel@...r.kernel.org Subject: Re: [RFC PATCH v1 0/5] Add support for O_MAYEXEC * Matthew Wilcox: > On Wed, Dec 12, 2018 at 09:17:07AM +0100, Mickaël Salaün wrote: >> The goal of this patch series is to control script interpretation. A >> new O_MAYEXEC flag used by sys_open() is added to enable userland script >> interpreter to delegate to the kernel (and thus the system security >> policy) the permission to interpret scripts or other files containing >> what can be seen as commands. > > I don't have a problem with the concept, but we're running low on O_ bits. > Does this have to be done before the process gets a file descriptor, > or could we have a new syscall? Since we're going to be changing the > interpreters anyway, it doesn't seem like too much of an imposition to > ask them to use: > > int verify_for_exec(int fd) > > instead of adding an O_MAYEXEC. Will this work for auditing? Maybe add an interface which explicitly upgrades O_PATH descriptors, and give that a separate flag argument? I suppose that would be more friendly to auditing. Thanks, Florian
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