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Message-ID: <202110071217.16C7208F@keescook>
Date: Thu, 7 Oct 2021 12:25:27 -0700
From: Kees Cook <keescook@...omium.org>
To: Mickaël Salaün <mic@...ikod.net>
Cc: Al Viro <viro@...iv.linux.org.uk>,
Andrew Morton <akpm@...ux-foundation.org>,
Aleksa Sarai <cyphar@...har.com>, Andy Lutomirski <luto@...nel.org>,
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Mickaël Salaün <mic@...ux.microsoft.com>
Subject: Re: [PATCH v13 1/3] fs: Add trusted_for(2) syscall implementation
and related sysctl
On Thu, Oct 07, 2021 at 08:23:18PM +0200, Mickaël Salaün wrote:
> From: Mickaël Salaün <mic@...ux.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@...omium.org>
--
Kees Cook
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