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From: Saravana Kannan <saravanak@google.com>
To: Matthias Maennich <maennich@google.com>
Cc: LKML <linux-kernel@vger.kernel.org>,
	maco@android.com, Android Kernel Team <kernel-team@android.com>,
	arnd@arndb.de, geert@linux-m68k.org,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	hpa@zytor.com, jeyu@kernel.org,
	"Joel Fernandes (Google)" <joel@joelfernandes.org>,
	Kate Stewart <kstewart@linuxfoundation.org>,
	linux-arch@vger.kernel.org, linux-kbuild@vger.kernel.org,
	linux-m68k@lists.linux-m68k.org, linux-modules@vger.kernel.org,
	linux-scsi@vger.kernel.org, linux-usb@vger.kernel.org,
	lucas.de.marchi@gmail.com, Martijn Coenen <maco@google.com>,
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	Philippe Ombredanne <pombredanne@nexb.com>,
	sam@ravnborg.org, Sandeep Patil <sspatil@google.com>,
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	usb-storage@lists.one-eyed-alien.net, x86@kernel.org,
	yamada.masahiro@socionext.com,
	Andrew Morton <akpm@linux-foundation.org>,
	Johannes Weiner <hannes@cmpxchg.org>,
	"Peter Zijlstra (Intel)" <peterz@infradead.org>,
	Mauro Carvalho Chehab <mchehab+samsung@kernel.org>,
	David Howells <dhowells@redhat.com>,
	Patrick Bellasi <patrick.bellasi@arm.com>,
	Dan Williams <dan.j.williams@intel.com>,
	Adrian Reber <adrian@lisas.de>,
	Richard Guy Briggs <rgb@redhat.com>
Subject: Re: [PATCH v2 05/10] module: add config option MODULE_ALLOW_MISSING_NAMESPACE_IMPORTS
Date: Wed, 14 Aug 2019 10:34:43 -0700
Message-ID: <CAGETcx99Xx7aRPS-2Pw8h7O5D_+3T+1hbqja=p-gLN2wXApaEQ@mail.gmail.com> (raw)
In-Reply-To: <20190814125427.GA72826@google.com>

On Wed, Aug 14, 2019 at 5:54 AM 'Matthias Maennich' via kernel-team
<kernel-team@android.com> wrote:
>
> On Tue, Aug 13, 2019 at 01:15:44PM -0700, Saravana Kannan wrote:
> >On Tue, Aug 13, 2019 at 5:19 AM 'Matthias Maennich' via kernel-team
> ><kernel-team@android.com> wrote:
> >>
> >> If MODULE_ALLOW_MISSING_NAMESPACE_IMPORTS is enabled (default=n), the
> >> requirement for modules to import all namespaces that are used by
> >> the module is relaxed.
> >>
> >> Enabling this option effectively allows (invalid) modules to be loaded
> >> while only a warning is emitted.
> >>
> >> Disabling this option keeps the enforcement at module loading time and
> >> loading is denied if the module's imports are not satisfactory.
> >>
> >> Reviewed-by: Martijn Coenen <maco@android.com>
> >> Signed-off-by: Matthias Maennich <maennich@google.com>
> >> ---
> >>  init/Kconfig    | 14 ++++++++++++++
> >>  kernel/module.c | 11 +++++++++--
> >>  2 files changed, 23 insertions(+), 2 deletions(-)
> >>
> >> diff --git a/init/Kconfig b/init/Kconfig
> >> index bd7d650d4a99..b3373334cdf1 100644
> >> --- a/init/Kconfig
> >> +++ b/init/Kconfig
> >> @@ -2119,6 +2119,20 @@ config MODULE_COMPRESS_XZ
> >>
> >>  endchoice
> >>
> >> +config MODULE_ALLOW_MISSING_NAMESPACE_IMPORTS
> >> +       bool "Allow loading of modules with missing namespace imports"
> >> +       default n
> >> +       help
> >> +         Symbols exported with EXPORT_SYMBOL_NS*() are considered exported in
> >> +         a namespace. A module that makes use of a symbol exported with such a
> >> +         namespace is required to import the namespace via MODULE_IMPORT_NS().
> >> +         This option relaxes this requirement when loading a module.
> >
> >> While
> >> +         technically there is no reason to enforce correct namespace imports,
> >> +         it creates consistency between symbols defining namespaces and users
> >> +         importing namespaces they make use of.
> >
> >I'm confused by this sentence. It sounds like it's the opposite of
> >what the config is doing? Can you please reword it for clarify?
>
> How about:
>
>   Symbols exported with EXPORT_SYMBOL_NS*() are considered exported in
>   a namespace. A module that makes use of a symbol exported with such a
>   namespace is required to import the namespace via MODULE_IMPORT_NS().
>   There is no technical reason to enforce correct namespace imports,
>   but it creates consistency between symbols defining namespaces and
>   users importing namespaces they make use of. This option relaxes this
>   requirement and lifts the enforcement when loading a module.

That's a lot better. Especially moving the "This option relaxes..." to
the bottom. Thanks.

-Saravana

  reply index

Thread overview: 105+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20180716122125.175792-1-maco@android.com>
2019-08-13 12:16 ` [PATCH v2 0/10] Symbol namespaces - RFC Matthias Maennich
2019-08-13 12:16   ` [PATCH v2 01/10] module: support reading multiple values per modinfo tag Matthias Maennich
2019-08-13 12:40     ` Greg KH
2019-08-13 12:16   ` [PATCH v2 02/10] export: explicitly align struct kernel_symbol Matthias Maennich
2019-08-13 12:41     ` Greg KH
2019-08-13 12:17   ` [PATCH v2 03/10] module: add support for symbol namespaces Matthias Maennich
2019-08-13 15:26     ` Greg KH
2019-08-13 12:17   ` [PATCH v2 04/10] modpost: " Matthias Maennich
2019-08-13 15:27     ` Greg KH
2019-08-13 12:17   ` [PATCH v2 05/10] module: add config option MODULE_ALLOW_MISSING_NAMESPACE_IMPORTS Matthias Maennich
2019-08-13 18:17     ` Greg KH
2019-08-13 20:15     ` Saravana Kannan
2019-08-14 12:54       ` Matthias Maennich
2019-08-14 17:34         ` Saravana Kannan [this message]
2019-08-13 12:17   ` [PATCH v2 06/10] export: allow definition default namespaces in Makefiles or sources Matthias Maennich
2019-08-13 18:16     ` Greg KH
2019-08-13 18:16     ` Greg KH
2019-08-13 12:17   ` [PATCH v2 07/10] modpost: add support for generating namespace dependencies Matthias Maennich
2019-08-13 18:21     ` Greg KH
2019-08-13 12:17   ` [PATCH v2 08/10] scripts: Coccinelle script for " Matthias Maennich
2019-08-13 12:31     ` Julia Lawall
2019-08-13 12:44     ` Greg KH
2019-08-14  6:36     ` [Cocci] " Himanshu Jha
2019-08-14  8:03       ` Matthias Maennich
2019-08-14 12:00     ` [v2 " Markus Elfring
2019-08-15 13:50     ` Markus Elfring
2019-08-22  9:18       ` Matthias Maennich
2019-08-22 11:00         ` Markus Elfring
2019-08-13 12:17   ` [PATCH v2 09/10] usb-storage: remove single-use define for debugging Matthias Maennich
2019-08-13 12:42     ` Greg KH
2019-08-13 13:12       ` Greg KH
2019-08-13 12:17   ` [PATCH v2 10/10] RFC: usb-storage: export symbols in USB_STORAGE namespace Matthias Maennich
2019-08-13 12:45     ` Greg KH
2019-08-13 12:47     ` Greg KH
2019-08-13 15:02       ` Matthias Maennich
     [not found]   ` <20190821114955.12788-1-maennich@google.com>
2019-08-21 11:49     ` [PATCH v3 01/11] module: support reading multiple values per modinfo tag Matthias Maennich
2019-08-21 11:49     ` [PATCH v3 02/11] export: explicitly align struct kernel_symbol Matthias Maennich
2019-08-21 11:49     ` [PATCH v3 03/11] module: add support for symbol namespaces Matthias Maennich
2019-08-27 15:37       ` Jessica Yu
2019-08-27 16:04         ` Matthias Maennich
2019-08-21 11:49     ` [PATCH v3 04/11] modpost: " Matthias Maennich
2019-08-26 16:21       ` Jessica Yu
2019-08-27 14:41         ` Matthias Maennich
2019-08-28  9:43           ` Jessica Yu
2019-08-28  9:55             ` Matthias Maennich
2019-08-28 10:16               ` Jessica Yu
2019-08-21 11:49     ` [PATCH v3 05/11] module: add config option MODULE_ALLOW_MISSING_NAMESPACE_IMPORTS Matthias Maennich
2019-08-21 11:49     ` [PATCH v3 06/11] export: allow definition default namespaces in Makefiles or sources Matthias Maennich
2019-08-28 10:49       ` Jessica Yu
2019-08-28 10:56         ` Matthias Maennich
2019-08-21 11:49     ` [PATCH v3 07/11] modpost: add support for generating namespace dependencies Matthias Maennich
2019-08-21 11:49     ` [PATCH v3 08/11] scripts: Coccinelle script for " Matthias Maennich
2019-08-22  6:09       ` [v3 " Markus Elfring
2019-08-29 12:13       ` [PATCH v3 " Jessica Yu
2019-08-21 11:49     ` [PATCH v3 09/11] usb-storage: remove single-use define for debugging Matthias Maennich
2019-08-21 12:37       ` Greg KH
2019-08-21 13:21       ` Thomas Gleixner
2019-08-21 13:32         ` Greg KH
2019-08-21 11:49     ` [PATCH v3 10/11] RFC: usb-storage: export symbols in USB_STORAGE namespace Matthias Maennich
2019-08-21 12:38       ` Greg KH
2019-08-21 14:36         ` Jessica Yu
2019-08-21 23:13       ` Christoph Hellwig
2019-08-22  8:32         ` Matthias Maennich
2019-09-03 15:06 ` [PATCH v4 00/12] Symbol Namespaces Matthias Maennich
2019-09-03 15:06   ` [PATCH v4 01/12] module: support reading multiple values per modinfo tag Matthias Maennich
2019-09-03 15:06   ` [PATCH v4 02/12] export: explicitly align struct kernel_symbol Matthias Maennich
2019-09-03 15:06   ` [PATCH v4 03/12] module: add support for symbol namespaces Matthias Maennich
2019-09-03 15:06   ` [PATCH v4 04/12] modpost: " Matthias Maennich
2019-09-03 15:06   ` [PATCH v4 05/12] module: add config option MODULE_ALLOW_MISSING_NAMESPACE_IMPORTS Matthias Maennich
2019-09-03 15:06   ` [PATCH v4 06/12] export: allow definition default namespaces in Makefiles or sources Matthias Maennich
2019-09-03 15:06   ` [PATCH v4 07/12] modpost: add support for generating namespace dependencies Matthias Maennich
2019-09-03 15:06   ` [PATCH v4 08/12] scripts: Coccinelle script for " Matthias Maennich
2019-09-04  9:53     ` Masahiro Yamada
2019-09-05 14:46       ` Matthias Maennich
2019-09-03 15:06   ` [PATCH v4 09/12] docs: Add documentation for Symbol Namespaces Matthias Maennich
2019-09-04  7:16     ` Greg KH
2019-09-03 15:06   ` [PATCH v4 10/12] usb-storage: remove single-use define for debugging Matthias Maennich
2019-09-03 15:06   ` [PATCH v4 11/12] RFC: usb-storage: export symbols in USB_STORAGE namespace Matthias Maennich
2019-09-03 15:06   ` [PATCH v4 12/12] RFC: watchdog: export core symbols in WATCHDOG_CORE namespace Matthias Maennich
2019-09-03 16:10     ` Guenter Roeck
2019-09-04  8:45       ` Masahiro Yamada
2019-09-04 12:12         ` Guenter Roeck
2019-09-04 16:16           ` [usb-storage] " Matthew Dharm
2019-09-05 10:41             ` Jessica Yu
2019-09-05 10:52               ` Arnd Bergmann
2019-09-05 11:16                 ` Jessica Yu
2019-09-05 11:25                   ` Masahiro Yamada
2019-09-05 12:00                     ` Greg Kroah-Hartman
2019-09-05 11:25               ` Matthias Maennich
2019-09-04  9:37   ` [PATCH v4 00/12] Symbol Namespaces Masahiro Yamada
2019-09-06 10:32 ` [PATCH v5 00/11] " Matthias Maennich
2019-09-06 10:32   ` [PATCH v5 01/11] module: support reading multiple values per modinfo tag Matthias Maennich
2019-09-06 10:32   ` [PATCH v5 02/11] export: explicitly align struct kernel_symbol Matthias Maennich
2019-09-06 10:32   ` [PATCH v5 03/11] module: add support for symbol namespaces Matthias Maennich
2019-09-06 10:32   ` [PATCH v5 04/11] modpost: " Matthias Maennich
2019-09-06 10:32   ` [PATCH v5 05/11] module: add config option MODULE_ALLOW_MISSING_NAMESPACE_IMPORTS Matthias Maennich
2019-09-06 10:32   ` [PATCH v5 06/11] export: allow definition default namespaces in Makefiles or sources Matthias Maennich
2019-09-06 10:32   ` [PATCH v5 07/11] modpost: add support for generating namespace dependencies Matthias Maennich
2019-09-06 10:32   ` [PATCH v5 08/11] scripts: Coccinelle script for " Matthias Maennich
2019-09-06 10:32   ` [PATCH v5 09/11] docs: Add documentation for Symbol Namespaces Matthias Maennich
2019-09-06 10:32   ` [PATCH v5 10/11] usb-storage: remove single-use define for debugging Matthias Maennich
2019-09-06 12:59     ` Jessica Yu
2019-09-06 13:22       ` Greg KH
2019-09-06 10:32   ` [PATCH v5 11/11] usb-storage: export symbols in USB_STORAGE namespace Matthias Maennich
2019-09-09  8:35   ` [PATCH v5 00/11] Symbol Namespaces Jessica Yu

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