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Message-ID: <202005140845.16F1CDC@keescook>
Date: Thu, 14 May 2020 08:48:57 -0700
From: Kees Cook <keescook@...omium.org>
To: "Lev R. Oshvang ." <levonshe@...il.com>
Cc: Mickaël Salaün <mic@...ikod.net>,
linux-kernel@...r.kernel.org, Aleksa Sarai <cyphar@...har.com>,
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LSM List <linux-security-module@...r.kernel.org>,
linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH v5 2/6] fs: Add a MAY_EXECMOUNT flag to infer the noexec
mount property
On Thu, May 14, 2020 at 11:14:04AM +0300, Lev R. Oshvang . wrote:
> New sysctl is indeed required to allow userspace that places scripts
> or libs under noexec mounts.
But since this is a not-uncommon environment, we must have the sysctl
otherwise this change would break those systems.
> fs.mnt_noexec_strict =0 (allow, e) , 1 (deny any file with --x
> permission), 2 (deny when O_MAYEXEC absent), for any file with ---x
> permissions)
I don't think we want another mount option -- this is already fully
expressed with noexec and the system-wide sysctl.
--
Kees Cook
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