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From: Greg KH <gregkh@linuxfoundation.org>
To: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Luis Chamberlain <mcgrof@kernel.org>,
	viro@zeniv.linux.org.uk, rafael@kernel.org, jeyu@kernel.org,
	jmorris@namei.org, keescook@chromium.org, paul@paul-moore.com,
	stephen.smalley.work@gmail.com, eparis@parisplace.org,
	nayna@linux.ibm.com, zohar@linux.ibm.com,
	scott.branden@broadcom.com, dan.carpenter@oracle.com,
	skhan@linuxfoundation.org, geert@linux-m68k.org,
	tglx@linutronix.de, bauerman@linux.ibm.com, dhowells@redhat.com,
	linux-integrity@vger.kernel.org, linux-fsdevel@vger.kernel.org,
	kexec@lists.infradead.org, linux-security-module@vger.kernel.org,
	selinux@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 2/3] security: add symbol namespace for reading file data
Date: Wed, 13 May 2020 18:09:36 +0200	[thread overview]
Message-ID: <20200513160936.GC1362525@kroah.com> (raw)
In-Reply-To: <87k11fonbk.fsf@x220.int.ebiederm.org>

On Wed, May 13, 2020 at 10:40:31AM -0500, Eric W. Biederman wrote:
> Luis Chamberlain <mcgrof@kernel.org> writes:
> 
> > Certain symbols are not meant to be used by everybody, the security
> > helpers for reading files directly is one such case. Use a symbol
> > namespace for them.
> >
> > This will prevent abuse of use of these symbols in places they were
> > not inteded to be used, and provides an easy way to audit where these
> > types of operations happen as a whole.
> 
> Why not just remove the ability for the firmware loader to be a module?

I agree, it's been a mess of build options to try to keep alive over
time.

> Is there some important use case that requires the firmware loader
> to be a module?

I don't think so anymore.

> We already compile the code in by default.  So it is probably just
> easier to remove the modular support all together.  Which would allow
> the export of the security hooks to be removed as well.

Agreed.

thanks,

greg k-h

WARNING: multiple messages have this Message-ID (diff)
From: Greg KH <gregkh@linuxfoundation.org>
To: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: rafael@kernel.org, zohar@linux.ibm.com, dhowells@redhat.com,
	Luis Chamberlain <mcgrof@kernel.org>,
	paul@paul-moore.com, nayna@linux.ibm.com, jmorris@namei.org,
	geert@linux-m68k.org, dan.carpenter@oracle.com,
	keescook@chromium.org, scott.branden@broadcom.com,
	selinux@vger.kernel.org, viro@zeniv.linux.org.uk,
	skhan@linuxfoundation.org, eparis@parisplace.org,
	tglx@linutronix.de, stephen.smalley.work@gmail.com,
	kexec@lists.infradead.org, linux-kernel@vger.kernel.org,
	linux-security-module@vger.kernel.org, jeyu@kernel.org,
	linux-fsdevel@vger.kernel.org, linux-integrity@vger.kernel.org,
	bauerman@linux.ibm.com
Subject: Re: [PATCH 2/3] security: add symbol namespace for reading file data
Date: Wed, 13 May 2020 18:09:36 +0200	[thread overview]
Message-ID: <20200513160936.GC1362525@kroah.com> (raw)
In-Reply-To: <87k11fonbk.fsf@x220.int.ebiederm.org>

On Wed, May 13, 2020 at 10:40:31AM -0500, Eric W. Biederman wrote:
> Luis Chamberlain <mcgrof@kernel.org> writes:
> 
> > Certain symbols are not meant to be used by everybody, the security
> > helpers for reading files directly is one such case. Use a symbol
> > namespace for them.
> >
> > This will prevent abuse of use of these symbols in places they were
> > not inteded to be used, and provides an easy way to audit where these
> > types of operations happen as a whole.
> 
> Why not just remove the ability for the firmware loader to be a module?

I agree, it's been a mess of build options to try to keep alive over
time.

> Is there some important use case that requires the firmware loader
> to be a module?

I don't think so anymore.

> We already compile the code in by default.  So it is probably just
> easier to remove the modular support all together.  Which would allow
> the export of the security hooks to be removed as well.

Agreed.

thanks,

greg k-h

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kexec@lists.infradead.org
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  reply	other threads:[~2020-05-13 16:09 UTC|newest]

Thread overview: 44+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-13 15:21 [PATCH 0/3] fs: reduce export usage of kerne_read*() calls Luis Chamberlain
2020-05-13 15:21 ` Luis Chamberlain
2020-05-13 15:21 ` [PATCH 1/3] fs: unexport kernel_read_file() Luis Chamberlain
2020-05-13 15:21   ` Luis Chamberlain
2020-05-13 15:21 ` [PATCH 2/3] security: add symbol namespace for reading file data Luis Chamberlain
2020-05-13 15:21   ` Luis Chamberlain
2020-05-13 15:40   ` Eric W. Biederman
2020-05-13 15:40     ` Eric W. Biederman
2020-05-13 16:09     ` Greg KH [this message]
2020-05-13 16:09       ` Greg KH
2020-05-13 16:16     ` Luis Chamberlain
2020-05-13 16:16       ` Luis Chamberlain
2020-05-13 16:26       ` Greg KH
2020-05-13 16:26         ` Greg KH
2020-05-13 18:07       ` Josh Triplett
2020-05-13 18:07         ` Josh Triplett
2020-05-13 15:21 ` [PATCH 3/3] fs: move kernel_read*() calls to its own symbol namespace Luis Chamberlain
2020-05-13 15:21   ` Luis Chamberlain
2020-05-13 16:08   ` Greg KH
2020-05-13 16:08     ` Greg KH
2020-05-13 18:17 ` [PATCH 0/3] fs: reduce export usage of kerne_read*() calls Christoph Hellwig
2020-05-13 18:17   ` Christoph Hellwig
2020-05-15 21:29   ` Luis Chamberlain
2020-05-15 21:29     ` Luis Chamberlain
2020-05-18  6:22     ` Christoph Hellwig
2020-05-18  6:22       ` Christoph Hellwig
2020-05-18 12:37       ` Mimi Zohar
2020-05-18 12:37         ` Mimi Zohar
2020-05-18 15:21         ` Kees Cook
2020-05-18 15:21           ` Kees Cook
2020-07-29  1:20           ` Luis Chamberlain
2020-07-29  1:20             ` Luis Chamberlain
2020-05-22 22:24         ` Scott Branden
2020-05-22 22:24           ` Scott Branden
2020-05-22 23:04           ` Kees Cook
2020-05-22 23:04             ` Kees Cook
2020-05-22 23:25             ` Scott Branden
2020-05-22 23:25               ` Scott Branden
2020-05-24  2:52               ` Mimi Zohar
2020-05-24  2:52                 ` Mimi Zohar
2020-06-05 18:15                 ` Scott Branden
2020-06-05 18:15                   ` Scott Branden
2020-06-05 18:37                   ` Mimi Zohar
2020-06-05 18:37                     ` Mimi Zohar

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