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From: David Laight <David.Laight@ACULAB.COM>
To: 'Masahiro Yamada' <masahiroy@kernel.org>,
	Kees Cook <keescook@chromium.org>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	Michal Marek <michal.lkml@markovi.net>,
	"linux-hardening@vger.kernel.org"
	<linux-hardening@vger.kernel.org>,
	"Linux Kbuild mailing list" <linux-kbuild@vger.kernel.org>,
	Peter Zijlstra <peterz@infradead.org>,
	Justin Forbes <jforbes@redhat.com>,
	Ondrej Mosnacek <omosnace@redhat.com>
Subject: RE: [PATCH RFC] gcc-plugins: Handle GCC version mismatch for OOT modules
Date: Tue, 26 Jan 2021 12:16:08 +0000	[thread overview]
Message-ID: <e3fbf778e64f4402b37c878dec580ba0@AcuMS.aculab.com> (raw)
In-Reply-To: <CAK7LNASOf=B_j5o=L=BL+vz_JK_d3QYUuHg8h+3SP6qOyYD86A@mail.gmail.com>

> We started with the assumption that modules must be compiled
> by the same compiler as the kernel was.
> https://lore.kernel.org/patchwork/patch/836247/#1031547
> 
> Now that the compiler capability is evaluated in Kconfig,
> this is a harder requirement.
> 
> In reality, a different compiler might be used,
> and, this requirement might be loosened, but
> the same compiler should be required for CONFIG_GCC_PLUGINS.

Hmmmm.

If I'm building a module to load into a distro kernel
it is very unlikely that I'll actually have the same version
of the compiler installed as that used to build the kernel.

Additionally some of the .o files (that don't refer to any
kernel headers) may have been compiled with an entirely
different compiler altogether.

Whether any plugins are actually installed is another problem.

	David

-
Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK
Registration No: 1397386 (Wales)

  reply	other threads:[~2021-01-26 12:21 UTC|newest]

Thread overview: 57+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-01-25 20:42 [PATCH RFC] gcc-plugins: Handle GCC version mismatch for OOT modules Josh Poimboeuf
2021-01-25 21:16 ` Masahiro Yamada
2021-01-25 21:27   ` Josh Poimboeuf
2021-01-25 21:44     ` Masahiro Yamada
2021-01-25 22:07       ` Josh Poimboeuf
2021-01-26  8:13         ` Greg KH
2021-01-26 12:44           ` Justin Forbes
2021-01-26 13:51             ` Greg KH
2021-01-26 14:51               ` Josh Poimboeuf
2021-01-26 15:00                 ` Greg KH
2021-01-26 15:15                 ` Peter Zijlstra
2021-01-26 15:46                   ` Josh Poimboeuf
2021-01-26 16:05                     ` Peter Zijlstra
2021-01-26 16:15                       ` Justin Forbes
2021-01-26 16:19                         ` Josh Poimboeuf
2021-01-26 17:06                           ` Greg KH
2021-01-26 17:47                             ` Justin Forbes
2021-01-26 16:22                       ` David Laight
2021-01-27 18:03             ` Christoph Hellwig
2021-01-26  8:12     ` Greg KH
2021-01-25 22:03 ` Kees Cook
2021-01-25 22:19   ` Josh Poimboeuf
2021-01-26 17:56     ` Kees Cook
2021-01-26 18:43       ` Josh Poimboeuf
2021-01-26 22:59         ` Kees Cook
2021-01-26 23:32           ` Josh Poimboeuf
2021-01-26  1:53   ` Masahiro Yamada
2021-01-26 12:16     ` David Laight [this message]
2021-01-27 18:02 ` Christoph Hellwig
2021-01-27 18:38   ` Josh Poimboeuf
2021-01-27 18:43     ` Christoph Hellwig
2021-01-27 18:51       ` Josh Poimboeuf
2021-01-27 22:09         ` David Laight
2021-01-28 14:29         ` Christoph Hellwig
2021-01-28 15:45           ` Josh Poimboeuf
2021-03-02 23:26 ` Josh Poimboeuf
2021-03-03 18:49   ` Masahiro Yamada
2021-03-03 19:15     ` Josh Poimboeuf
2021-03-03 19:25       ` Linus Torvalds
2021-03-03 19:38         ` Josh Poimboeuf
2021-03-03 19:57           ` Linus Torvalds
2021-03-03 20:24             ` Josh Poimboeuf
2021-03-03 20:31               ` Josh Poimboeuf
2021-03-03 20:56               ` Linus Torvalds
2021-03-03 21:45                 ` Josh Poimboeuf
2021-03-04 12:27                   ` Masahiro Yamada
2021-03-04 15:08                     ` Josh Poimboeuf
2021-03-04 15:35                       ` Masahiro Yamada
2021-03-04 19:12                         ` Linus Torvalds
2021-03-05  2:41                           ` Josh Poimboeuf
2021-03-05  2:49                             ` Linus Torvalds
2021-03-05 16:03                             ` Masahiro Yamada
2021-03-05 19:18                               ` Josh Poimboeuf
2021-03-08  9:39                                 ` David Laight
2021-03-05 15:31                           ` Masahiro Yamada
2021-03-03 21:52             ` Kees Cook
2021-03-04 12:26       ` Masahiro Yamada

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