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

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Date:   Tue, 23 Jun 2020 10:39:26 -0700 (PDT)
From:   Christian Kujau <lists@...dbynature.de>
To:     Alexey Dobriyan <adobriyan@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Willy Tarreau <w@....eu>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        Kees Kook <keescook@...omium.org>
cc:     linux-kernel@...r.kernel.org
Subject: process '/usr/bin/rsync' started with executable stack

Hi,

exactly this[0] happened today, on a 5.6.5 kernel:

  process '/usr/bin/rsync' started with executable stack

But I can't reproduce this message, and rsync (v3.2.0, not exactly 
abandonware) runs several times a day, so to repeat Andrew's questions[0] 
from last year:

  > What are poor users supposed to do if this message comes out? 
  > Hopefully google the message and end up at this thread.  What do you
  > want to tell them?

Also, the PID is missing from that message. I had some long running rsync 
processes running earlier, maybe the RWE status would have been visible in 
/proc/$PID/map, or somewhere else maybe?

Please advise? :-)

Thanks,
Christian.

[0] https://lore.kernel.org/patchwork/patch/1164047/#1362722


$ checksec --format=json --extended --file=`which rsync` | jq
{
  "/usr/bin/rsync": {
    "relro": "full",
    "canary": "yes",
    "nx": "no",
    "pie": "yes",
    "clangcfi": "no",
    "safestack": "no",
    "rpath": "no",
    "runpath": "no",
    "symbols": "no",
    "fortify_source": "yes",
    "fortified": "10",
    "fortify-able": "19"
  }
}

-- 
BOFH excuse #244:

Your cat tried to eat the mouse.