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Date: Tue, 5 May 2020 18:55:59 +0200
From: Mickaël Salaün <mic@...ikod.net>
To: Randy Dunlap <rdunlap@...radead.org>, linux-kernel@...r.kernel.org
Cc: Aleksa Sarai <cyphar@...har.com>, Alexei Starovoitov <ast@...nel.org>,
Al Viro <viro@...iv.linux.org.uk>, Andy Lutomirski <luto@...nel.org>,
Christian Heimes <christian@...hon.org>,
Daniel Borkmann <daniel@...earbox.net>,
Deven Bowers <deven.desai@...ux.microsoft.com>,
Eric Chiang <ericchiang@...gle.com>, Florian Weimer <fweimer@...hat.com>,
James Morris <jmorris@...ei.org>, Jan Kara <jack@...e.cz>,
Jann Horn <jannh@...gle.com>, Jonathan Corbet <corbet@....net>,
Kees Cook <keescook@...omium.org>,
Lakshmi Ramasubramanian <nramas@...ux.microsoft.com>,
Matthew Garrett <mjg59@...gle.com>, Matthew Wilcox <willy@...radead.org>,
Michael Kerrisk <mtk.manpages@...il.com>,
Mickaël Salaün <mickael.salaun@....gouv.fr>,
Mimi Zohar <zohar@...ux.ibm.com>,
Philippe Trébuchet <philippe.trebuchet@....gouv.fr>,
Scott Shell <scottsh@...rosoft.com>,
Sean Christopherson <sean.j.christopherson@...el.com>,
Shuah Khan <shuah@...nel.org>, Steve Dower <steve.dower@...hon.org>,
Steve Grubb <sgrubb@...hat.com>,
Thibaut Sautereau <thibaut.sautereau@....gouv.fr>,
Vincent Strubel <vincent.strubel@....gouv.fr>,
kernel-hardening@...ts.openwall.com, linux-api@...r.kernel.org,
linux-integrity@...r.kernel.org, linux-security-module@...r.kernel.org,
linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH v5 3/6] fs: Enable to enforce noexec mounts or file exec
through O_MAYEXEC
On 05/05/2020 17:44, Randy Dunlap wrote:
> On 5/5/20 8:31 AM, Mickaël Salaün wrote:
>> diff --git a/security/Kconfig b/security/Kconfig
>> index cd3cc7da3a55..d8fac9240d14 100644
>> --- a/security/Kconfig
>> +++ b/security/Kconfig
>> @@ -230,6 +230,32 @@ config STATIC_USERMODEHELPER_PATH
>> If you wish for all usermode helper programs to be disabled,
>> specify an empty string here (i.e. "").
>>
>> +menuconfig OMAYEXEC_STATIC
>> + tristate "Configure O_MAYEXEC behavior at build time"
>> + ---help---
>> + Enable to enforce O_MAYEXEC at build time, and disable the dedicated
>> + fs.open_mayexec_enforce sysctl.
>
> That help message is a bit confusing IMO. Does setting/enabling OMAYEXEC_STATIC
> both enforce O_MAYEXEC at build time and also disable the dedicated sysctl?
Yes. What about this?
"Define the O_MAYEXEC policy at build time only. As a side effect, this
also disables the fs.open_mayexec_enforce sysctl."
>
> Or are these meant to be alternatives, one for what Enabling this kconfig symbol
> does and the other for what Disabling this symbol does? If so, it doesn't
> say that.
>
>> +
>> + See Documentation/admin-guide/sysctl/fs.rst for more details.
>> +
>> +if OMAYEXEC_STATIC
>> +
>> +config OMAYEXEC_ENFORCE_MOUNT
>> + bool "Mount restriction"
>> + default y
>> + ---help---
>> + Forbid opening files with the O_MAYEXEC option if their underlying VFS is
>> + mounted with the noexec option or if their superblock forbids execution
>> + of its content (e.g., /proc).
>> +
>> +config OMAYEXEC_ENFORCE_FILE
>> + bool "File permission restriction"
>> + ---help---
>> + Forbid opening files with the O_MAYEXEC option if they are not marked as
>> + executable for the current process (e.g., POSIX permissions).
>> +
>> +endif # OMAYEXEC_STATIC
>> +
>> source "security/selinux/Kconfig"
>> source "security/smack/Kconfig"
>> source "security/tomoyo/Kconfig"
>
>
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