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Message-ID: <3555aab7-f4e0-80eb-0dfc-a87cfcba5e68@digikod.net> 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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