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> In-Reply-To: <c9f4d964-e530-c767-1031-de825bcbe38d@FreeBSD.org> References: <201705151848.v4FImwMW070221@repo.freebsd.org> <20170515185236.GB1637@FreeBSD.org> <20170515190030.GG1622@kib.kiev.ua> <1494875335.59865.118.camel@freebsd.org> <20170515192529.GH1622@kib.kiev.ua> <20170515193609.GC28684@FreeBSD.org> <c9f4d964-e530-c767-1031-de825bcbe38d@FreeBSD.org>
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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
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