linux-kernel.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: Alexander Gordeev <agordeev@linux.ibm.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: Re: [PATCH 2/2] mm/mmap.c: do not allow mappings outside of allowed limits
Date: Tue, 21 Apr 2020 07:29:46 +0200	[thread overview]
Message-ID: <20200421052945.GA26279@oc3871087118.ibm.com> (raw)
In-Reply-To: <20200420195903.93455e087985b423f97bdfe3@linux-foundation.org>

On Mon, Apr 20, 2020 at 07:59:03PM -0700, Andrew Morton wrote:
> On Mon, 23 Mar 2020 14:29:29 +0100 agordeev@linux.ibm.com wrote:
> 
> > It is possible to request a fixed mapping address below
> > mmap_min_addr and succeed. This update adds early checks
> > of mmap_min_addr and mmap_end boundaries and fixes the
> > above issue.
> 
> Does this solve any known problems?  If not, what is the motivation for
> the change?

One can set a lowest possible address in /proc/sys/vm/mmap_min_addr 
and mmap below that bound nevertheless. Apart from it is wrong I am
not aware of any existing issue.

Thanks!


      reply	other threads:[~2020-04-21  5:35 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-23 13:29 [PATCH 0/2] mm/mmap: check mapping limits more strictly agordeev
2020-03-23 13:29 ` [PATCH 1/2] mm/mmap.c: add more sanity checks to get_unmapped_area() agordeev
2020-03-23 13:29 ` [PATCH 2/2] mm/mmap.c: do not allow mappings outside of allowed limits agordeev
2020-04-21  2:59   ` Andrew Morton
2020-04-21  5:29     ` Alexander Gordeev [this message]

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20200421052945.GA26279@oc3871087118.ibm.com \
    --to=agordeev@linux.ibm.com \
    --cc=akpm@linux-foundation.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-mm@kvack.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).