From: Kees Cook <keescook@chromium.org>
To: "Mickaël Salaün" <mic@digikod.net>
Cc: "Al Viro" <viro@zeniv.linux.org.uk>,
"Andrew Morton" <akpm@linux-foundation.org>,
"Aleksa Sarai" <cyphar@cyphar.com>,
"Andy Lutomirski" <luto@kernel.org>,
"Arnd Bergmann" <arnd@arndb.de>,
"Casey Schaufler" <casey@schaufler-ca.com>,
"Christian Brauner" <christian.brauner@ubuntu.com>,
"Christian Heimes" <christian@python.org>,
"Deven Bowers" <deven.desai@linux.microsoft.com>,
"Dmitry Vyukov" <dvyukov@google.com>,
"Eric Biggers" <ebiggers@kernel.org>,
"Eric Chiang" <ericchiang@google.com>,
"Florian Weimer" <fweimer@redhat.com>,
"Geert Uytterhoeven" <geert@linux-m68k.org>,
"James Morris" <jmorris@namei.org>, "Jan Kara" <jack@suse.cz>,
"Jann Horn" <jannh@google.com>,
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"Lakshmi Ramasubramanian" <nramas@linux.microsoft.com>,
"Madhavan T . Venkataraman" <madvenka@linux.microsoft.com>,
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"Steve Grubb" <sgrubb@redhat.com>,
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"Vincent Strubel" <vincent.strubel@ssi.gouv.fr>,
kernel-hardening@lists.openwall.com, linux-api@vger.kernel.org,
linux-fsdevel@vger.kernel.org, linux-integrity@vger.kernel.org,
linux-kernel@vger.kernel.org,
linux-security-module@vger.kernel.org,
"Mickaël Salaün" <mic@linux.microsoft.com>
Subject: Re: [PATCH v13 1/3] fs: Add trusted_for(2) syscall implementation and related sysctl
Date: Thu, 7 Oct 2021 12:25:27 -0700 [thread overview]
Message-ID: <202110071217.16C7208F@keescook> (raw)
In-Reply-To: <20211007182321.872075-2-mic@digikod.net>
On Thu, Oct 07, 2021 at 08:23:18PM +0200, Mickaël Salaün wrote:
> From: Mickaël Salaün <mic@linux.microsoft.com>
>
> The trusted_for() syscall enables user space tasks to check that files
> are trusted to be executed or interpreted by user space. This may allow
> script interpreters to check execution permission before reading
> commands from a file, or dynamic linkers to allow shared object loading.
> This may be seen as a way for a trusted task (e.g. interpreter) to check
> the trustworthiness of files (e.g. scripts) before extending its control
> flow graph with new ones originating from these files.
> [...]
> aio-nr & aio-max-nr
> @@ -382,3 +383,52 @@ Each "watch" costs roughly 90 bytes on a 32bit kernel, and roughly 160 bytes
> on a 64bit one.
> The current default value for max_user_watches is the 1/25 (4%) of the
> available low memory, divided for the "watch" cost in bytes.
> +
> +
> +trust_policy
> +------------
bikeshed: can we name this "trusted_for_policy"? Both "trust" and
"policy" are very general words, but "trusted_for" (after this series)
will have a distinct meaning, so "trusted_for_policy" becomes more
specific/searchable.
With that renamed, I think it looks good! I'm looking forward to
interpreters using this. :)
Acked-by: Kees Cook <keescook@chromium.org>
--
Kees Cook
next prev parent reply other threads:[~2021-10-07 19:25 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-10-07 18:23 [PATCH v13 0/3] Add trusted_for(2) (was O_MAYEXEC) Mickaël Salaün
2021-10-07 18:23 ` [PATCH v13 1/3] fs: Add trusted_for(2) syscall implementation and related sysctl Mickaël Salaün
2021-10-07 19:25 ` Kees Cook [this message]
2021-10-08 10:16 ` Mickaël Salaün
2021-10-07 18:23 ` [PATCH v13 2/3] arch: Wire up trusted_for(2) Mickaël Salaün
2021-10-07 19:26 ` Kees Cook
2021-10-07 18:23 ` [PATCH v13 3/3] selftest/interpreter: Add tests for trusted_for(2) policies Mickaël Salaün
2021-10-07 19:48 ` Kees Cook
2021-10-08 10:21 ` Mickaël Salaün
2021-10-08 22:44 ` Kees Cook
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