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Date: Mon, 15 May 2017 19:40:10 +0000
From: Alexey Dokuchaev <danfe@FreeBSD.org>
To: Nikolai Lifanov <lifanov@FreeBSD.org>
Cc: Konstantin Belousov <kostikbel@gmail.com>, svn-src-head@freebsd.org,
 svn-src-all@freebsd.org, src-committers@freebsd.org,
 Ian Lepore <ian@freebsd.org>
Subject: Re: svn commit: r318313 - head/libexec/rtld-elf
Message-ID: <20170515194010.GD28684@FreeBSD.org>
References: <201705151848.v4FImwMW070221@repo.freebsd.org>
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 <20170515190030.GG1622@kib.kiev.ua>
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On Mon, May 15, 2017 at 03:37:42PM -0400, Nikolai Lifanov wrote:
> On 05/15/2017 15:36, Alexey Dokuchaev wrote:
> > On Mon, May 15, 2017 at 10:25:29PM +0300, Konstantin Belousov wrote:
> >> ...
> >> The most advanced explanation that I was given in private was among
> >> the lines: "if you have an environment where users can upload content
> >> to a shared server, but have no access to chmod(2), no compilers, no
> >> scripting languages, etc." The person then admitted that (s)he does not
> >> consider it as an actual concern.
> > 
> > Would this now allow executing binaries (with or without +x bit) from
> > filesystems mounted with -o noexec?
> 
> No:
> 
> # zfs create -o mountpoint=/mnt -o exec=off tank/TEST
> # cp /bin/sh /mnt/
> # /mnt/sh
> /mnt/sh: Permission denied.
> # /libexec/ld-elf.so.1 /mnt/sh
> /mnt/sh: mmap of data failed: Permission denied

Good, thanks for conducting this test Nikolai.

./danfe