linux-kernel - Re: process '/usr/bin/rsync' started with executable stack

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Message-ID: <202006241238.E9CB1CE85B@keescook>
Date:   Wed, 24 Jun 2020 12:39:24 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Dan Carpenter <dan.carpenter@...cle.com>
Cc:     Christian Kujau <lists@...dbynature.de>,
        Alexey Dobriyan <adobriyan@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Willy Tarreau <w@....eu>, linux-kernel@...r.kernel.org
Subject: Re: process '/usr/bin/rsync' started with executable stack

On Wed, Jun 24, 2020 at 07:51:48PM +0300, Dan Carpenter wrote:
> In Debian testing the initrd triggers the warning.
> 
> [   34.529809] process '/usr/bin/fstype' started with executable stack

Where does fstype come from there? I am going to guess it is either
busybox or linked against klibc?

klibc has known problems with executable stacks due to its trampoline
implementation:
https://wiki.ubuntu.com/SecurityTeam/Roadmap/ExecutableStacks

> 
> $ checksec --format=json --extended --file=/var/tmp/mkinitramfs_eTyMPQ/bin/fstype | jq
> {
>   "file": {
>     "relro": "no",
>     "canary": "no",
>     "nx": "no",
>     "pie": "no",
>     "clangcfi": "no",
>     "safestack": "no",
>     "rpath": "no",
>     "runpath": "no",
>     "symbols": "no",
>     "fortify_source": "no",
>     "fortified": "0",
>     "fortify-able": "0"
>   }
> }

Wow. _nothing_ implemented. :(

-- 
Kees Cook