From: Florian Weimer <fweimer@redhat.com>
To: Steve Grubb <sgrubb@redhat.com>
Cc: "Mickaël Salaün" <mic@digikod.net>,
linux-kernel@vger.kernel.org, "Aleksa Sarai" <cyphar@cyphar.com>,
"Alexei Starovoitov" <ast@kernel.org>,
"Al Viro" <viro@zeniv.linux.org.uk>,
"Andy Lutomirski" <luto@kernel.org>,
"Christian Heimes" <christian@python.org>,
"Daniel Borkmann" <daniel@iogearbox.net>,
"Eric Chiang" <ericchiang@google.com>,
"James Morris" <jmorris@namei.org>, "Jan Kara" <jack@suse.cz>,
"Jann Horn" <jannh@google.com>,
"Jonathan Corbet" <corbet@lwn.net>,
"Kees Cook" <keescook@chromium.org>,
"Matthew Garrett" <mjg59@google.com>,
"Matthew Wilcox" <willy@infradead.org>,
"Michael Kerrisk" <mtk.manpages@gmail.com>,
"Mickaël Salaün" <mickael.salaun@ssi.gouv.fr>,
"Mimi Zohar" <zohar@linux.ibm.com>,
"Philippe Trébuchet" <philippe.trebuchet@ssi.gouv.fr>,
"Scott Shell" <scottsh@microsoft.com>,
"Sean Christopherson" <sean.j.christopherson@intel.com>,
"Shuah Khan" <shuah@kernel.org>,
"Song Liu" <songliubraving@fb.com>,
"Steve Dower" <steve.dower@python.org>,
"Thibaut Sautereau" <thibaut.sautereau@ssi.gouv.fr>,
"Vincent Strubel" <vincent.strubel@ssi.gouv.fr>,
"Yves-Alexis Perez" <yves-alexis.perez@ssi.gouv.fr>,
kernel-hardening@lists.openwall.com, linux-api@vger.kernel.org,
linux-security-module@vger.kernel.org,
linux-fsdevel@vger.kernel.org
Subject: Re: [PATCH v2 0/5] Add support for O_MAYEXEC
Date: Fri, 06 Sep 2019 20:57:00 +0200 [thread overview]
Message-ID: <87mufhckxv.fsf@oldenburg2.str.redhat.com> (raw)
In-Reply-To: <2989749.1YmIBkDdQn@x2> (Steve Grubb's message of "Fri, 06 Sep 2019 14:50:02 -0400")
* Steve Grubb:
> Now with LD_AUDIT
> $ LD_AUDIT=/home/sgrubb/test/openflags/strip-flags.so.0 strace ./test 2>&1 | grep passwd
> openat(3, "passwd", O_RDONLY) = 4
>
> No O_CLOEXEC flag.
I think you need to explain in detail why you consider this a problem.
With LD_PRELOAD and LD_AUDIT, you can already do anything, including
scanning other loaded objects for a system call instruction and jumping
to that (in case a security module in the kernel performs a PC check to
confer additional privileges).
Thanks,
Florian
WARNING: multiple messages have this Message-ID (diff)
From: Florian Weimer <fweimer@redhat.com>
To: Steve Grubb <sgrubb@redhat.com>
Cc: "Mickaël Salaün" <mic@digikod.net>,
linux-kernel@vger.kernel.org, "Aleksa Sarai" <cyphar@cyphar.com>,
"Alexei Starovoitov" <ast@kernel.org>,
"Al Viro" <viro@zeniv.linux.org.uk>,
"Andy Lutomirski" <luto@kernel.org>,
"Christian Heimes" <christian@python.org>,
"Daniel Borkmann" <daniel@iogearbox.net>,
"Eric Chiang" <ericchiang@google.com>,
"James Morris" <jmorris@namei.org>, "Jan Kara" <jack@suse.cz>,
"Jann Horn" <jannh@google.com>,
"Jonathan Corbet" <corbet@lwn.net>,
"Kees Cook" <keescook@chromium.org>,
"Matthew Garrett" <mjg59@google.com>,
"Matthew Wilcox" <willy@infradead.org>,
"Michael Kerrisk" <mtk.manpages@gmail.com>,
"Mickaël Salaün" <mickael.salaun@ssi.gouv.fr>,
"Mimi Zohar" <zohar@linux.ibm.com>
Subject: Re: [PATCH v2 0/5] Add support for O_MAYEXEC
Date: Fri, 06 Sep 2019 20:57:00 +0200 [thread overview]
Message-ID: <87mufhckxv.fsf@oldenburg2.str.redhat.com> (raw)
In-Reply-To: <2989749.1YmIBkDdQn@x2> (Steve Grubb's message of "Fri, 06 Sep 2019 14:50:02 -0400")
* Steve Grubb:
> Now with LD_AUDIT
> $ LD_AUDIT=/home/sgrubb/test/openflags/strip-flags.so.0 strace ./test 2>&1 | grep passwd
> openat(3, "passwd", O_RDONLY) = 4
>
> No O_CLOEXEC flag.
I think you need to explain in detail why you consider this a problem.
With LD_PRELOAD and LD_AUDIT, you can already do anything, including
scanning other loaded objects for a system call instruction and jumping
to that (in case a security module in the kernel performs a PC check to
confer additional privileges).
Thanks,
Florian
next prev parent reply other threads:[~2019-09-06 18:57 UTC|newest]
Thread overview: 90+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-09-06 15:24 [PATCH v2 0/5] Add support for O_MAYEXEC Mickaël Salaün
2019-09-06 15:24 ` Mickaël Salaün
2019-09-06 15:24 ` [PATCH v2 1/5] fs: Add support for an O_MAYEXEC flag on sys_open() Mickaël Salaün
2019-09-06 15:24 ` Mickaël Salaün
2019-09-06 15:56 ` Florian Weimer
2019-09-06 15:56 ` Florian Weimer
2019-09-06 16:06 ` Mickaël Salaün
2019-09-06 16:06 ` Mickaël Salaün
2019-09-06 16:48 ` Jeff Layton
2019-09-06 16:48 ` Jeff Layton
2019-09-06 17:13 ` Aleksa Sarai
2019-09-06 17:13 ` Aleksa Sarai
2019-09-06 19:43 ` Jeff Layton
2019-09-06 19:43 ` Jeff Layton
2019-09-06 20:06 ` Andy Lutomirski
2019-09-06 20:06 ` Andy Lutomirski
2019-09-06 20:51 ` Jeff Layton
2019-09-06 20:51 ` Jeff Layton
2019-09-06 21:27 ` Andy Lutomirski
2019-09-06 21:27 ` Andy Lutomirski
2019-09-06 22:12 ` Aleksa Sarai
2019-09-06 22:12 ` Aleksa Sarai
2019-09-09 9:33 ` Mickaël Salaün
2019-09-09 9:33 ` Mickaël Salaün
2019-09-06 22:05 ` Aleksa Sarai
2019-09-06 22:05 ` Aleksa Sarai
2019-09-06 22:18 ` Aleksa Sarai
2019-09-06 22:18 ` Aleksa Sarai
2019-09-06 17:14 ` Mickaël Salaün
2019-09-06 17:14 ` Mickaël Salaün
2019-09-06 18:38 ` Jeff Layton
2019-09-06 18:38 ` Jeff Layton
2019-09-06 18:41 ` Andy Lutomirski
2019-09-06 18:41 ` Andy Lutomirski
2019-09-09 9:18 ` Mickaël Salaün
2019-09-09 9:18 ` Mickaël Salaün
2019-09-09 15:49 ` Andy Lutomirski
2019-09-09 15:49 ` Andy Lutomirski
2019-09-06 18:44 ` Florian Weimer
2019-09-06 18:44 ` Florian Weimer
2019-09-06 19:03 ` James Morris
2019-09-06 19:03 ` James Morris
2019-09-09 9:25 ` Mickaël Salaün
2019-09-09 9:25 ` Mickaël Salaün
2019-09-09 10:12 ` James Morris
2019-09-09 10:12 ` James Morris
2019-09-09 10:54 ` Mickaël Salaün
2019-09-09 10:54 ` Mickaël Salaün
2019-09-09 12:28 ` Aleksa Sarai
2019-09-09 12:28 ` Aleksa Sarai
2019-09-09 12:33 ` Mickaël Salaün
2019-09-09 12:33 ` Mickaël Salaün
2019-09-09 11:54 ` Aleksa Sarai
2019-09-09 11:54 ` Aleksa Sarai
2019-09-09 12:28 ` Mickaël Salaün
2019-09-09 12:28 ` Mickaël Salaün
2019-09-06 17:07 ` Aleksa Sarai
2019-09-06 17:07 ` Aleksa Sarai
2019-09-06 17:20 ` Christian Brauner
2019-09-06 17:20 ` Christian Brauner
2019-09-06 17:24 ` Mickaël Salaün
2019-09-06 17:24 ` Mickaël Salaün
2019-09-06 17:40 ` Tycho Andersen
2019-09-06 17:40 ` Tycho Andersen
2019-09-06 18:27 ` Florian Weimer
2019-09-06 18:27 ` Florian Weimer
2019-09-06 18:46 ` Tycho Andersen
2019-09-06 18:46 ` Tycho Andersen
2019-09-06 15:24 ` [PATCH v2 2/5] fs: Add a MAY_EXECMOUNT flag to infer the noexec mount propertie Mickaël Salaün
2019-09-06 15:24 ` Mickaël Salaün
2019-09-06 15:24 ` [PATCH v2 3/5] fs: Enable to enforce noexec mounts or file exec through O_MAYEXEC Mickaël Salaün
2019-09-06 15:24 ` Mickaël Salaün
2019-09-06 15:24 ` [PATCH v2 4/5] selftest/exec: Add tests for O_MAYEXEC enforcing Mickaël Salaün
2019-09-06 15:24 ` Mickaël Salaün
2019-09-06 15:24 ` [PATCH v2 5/5] doc: Add documentation for the fs.open_mayexec_enforce sysctl Mickaël Salaün
2019-09-06 15:24 ` Mickaël Salaün
2019-09-06 18:50 ` [PATCH v2 0/5] Add support for O_MAYEXEC Steve Grubb
2019-09-06 18:50 ` Steve Grubb
2019-09-06 18:57 ` Florian Weimer [this message]
2019-09-06 18:57 ` Florian Weimer
2019-09-06 19:07 ` Steve Grubb
2019-09-06 19:07 ` Steve Grubb
2019-09-06 19:26 ` Andy Lutomirski
2019-09-06 19:26 ` Andy Lutomirski
2019-09-06 22:44 ` Aleksa Sarai
2019-09-06 22:44 ` Aleksa Sarai
2019-09-09 9:09 ` Mickaël Salaün
2019-09-09 9:09 ` Mickaël Salaün
2019-09-09 0:16 ` James Morris
2019-09-09 0:16 ` James Morris
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