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Date: Mon, 15 May 2017 19:42:23 +0000
From: Alexey Dokuchaev <danfe@FreeBSD.org>
To: Konstantin Belousov <kostikbel@gmail.com>
Cc: Nikolai Lifanov <lifanov@FreeBSD.org>, 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: <20170515194223.GE28684@FreeBSD.org>
References: <201705151848.v4FImwMW070221@repo.freebsd.org>
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 <20170515190030.GG1622@kib.kiev.ua>
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 <20170515192529.GH1622@kib.kiev.ua>
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On Mon, May 15, 2017 at 10:40:49PM +0300, Konstantin Belousov wrote:
> On Mon, May 15, 2017 at 03:37:42PM -0400, Nikolai Lifanov wrote:
> > On 05/15/2017 15:36, Alexey Dokuchaev wrote:
> > > ...
> > > 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
> 
> This is due to
> r313967 | kib | 2017-02-19 22:51:04 +0200 (Sun, 19 Feb 2017) | 24 lines
> Apply noexec mount option for mmap(PROT_EXEC).

Nice, good to know that.

./danfe