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From: Vitaly Chikunov <vt@altlinux.org>
To: "Mickaël Salaün" <mic@digikod.net>, landlock@lists.linux.dev
Subject: R/O protection for lower level dirs
Date: Mon, 1 Apr 2024 19:06:14 +0300	[thread overview]
Message-ID: <20240401160614.32py2wrijdp5yots@altlinux.org> (raw)

Hi, 

I want to ensure that some deeper directory is write protected (as a non
security measure but so that some post-install processing do not
accidentally touch installed files).  Is there a way to achieve this
with Landlock?

For example, if we do R/W access to / (root tree is already protected
enough with DAC) and then R/O access to /home we still get full R/W access
everywhere and /home seems not restricted. Also, Landlock does not warn for
such configuration, silently accepting it as valid.

Practical example:

  ~$ LL_FS_RW=/ LL_FS_RO=/home sandboxer touch a
  Executing the sandboxed command...
  ~$ ls -l a
  -rw-r--r-- 1 vt vt 0 Apr  1 15:53 a

Thanks,

next             reply	other threads:[~2024-04-01 16:06 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2024-04-01 16:06 Vitaly Chikunov [this message]
2024-04-02  9:11 ` R/O protection for lower level dirs Mickaël Salaün
2024-04-03 15:20   ` Vitaly Chikunov
2024-04-03 16:57     ` Mickaël Salaün
2024-04-05 16:04       ` Vitaly Chikunov
2024-04-06 17:19         ` Mickaël Salaün
2024-04-04  8:03     ` Simon de Vlieger

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