linux-kernel - Re: [Linux-ima-user] Initramfs and IMA Appraisal

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Date:	Mon, 29 Dec 2014 08:45:36 -0500
From:	Mimi Zohar <zohar@...ux.vnet.ibm.com>
To:	Christophe Fillot <cf@....fr>
Cc:	linux-ima-user@...ts.sourceforge.net,
	Rob Landley <rob@...dley.net>,
	linux-security-module <linux-security-module@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [Linux-ima-user] Initramfs and IMA Appraisal

On Thu, 2014-11-27 at 10:15 +0100, Christophe Fillot wrote:
> >
> > Are you using an initrd not an initramfs?  According to
> > Documentation/filesystems/ramfs-rootfs-initramfs.txt, "If
> CONFIG_TMPFS
> > is enabled, rootfs will use tmpfs instead of ramfs by default".
> >
> Yes, that what I thought too, but it seems that it is not really the 
> case because of this test:
> 
>      if (IS_ENABLED(CONFIG_TMPFS) && !saved_root_name[0] &&
>          (!root_fs_names || strstr(root_fs_names, "tmpfs"))) {
>          err = shmem_init();
>          is_tmpfs = true;
>      } else {
>          err = init_ramfs_fs();
>      }

[CC'ing Rob Landley, lsm, lkml]

Thanks!  "saved_root_name" is set to the boot command line "root="
option, which in my case is the UUID.  I'm not sure why real root should
impact the initramfs tmpfs/ramfs decision.

Unless there is a good explanation, did you want to post a patch to
remove the test?

Mimi



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