lkml.org 
[lkml]   [2020]   [Jan]   [7]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
Date
SubjectRe: [PATCH RFC 1/1] mount: universally disallow mounting over symlinks
On Mon, Dec 30, 2019 at 12:29 AM Aleksa Sarai <cyphar@cyphar.com> wrote:
>
> On 2019-12-29, Linus Torvalds <torvalds@linux-foundation.org> wrote:
> > On Sun, Dec 29, 2019 at 9:21 PM Aleksa Sarai <cyphar@cyphar.com> wrote:
>
> If allowing bind-mounts over symlinks is allowed (which I don't have a
> problem with really), it just means we'll need a few more kernel pieces
> to get this hardening to work. But these features would be useful
> outside of the problems I'm dealing with (O_EMPTYPATH and some kind of
> pidfd-based interface to grab the equivalent of /proc/self/exe and a few
> other such magic-link targets).

As one data point, I would use this ability in virtme: this would
allow me to more reliably mount over /etc/resolve.conf even when it's
a symlink.

(Perhaps I should use overlayfs instead. Hmm.)

\
 
 \ /
  Last update: 2020-01-08 05:40    [W:0.093 / U:5.756 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site