From: David Laight <David.Laight@ACULAB.COM> To: 'Josh Poimboeuf' <jpoimboe@redhat.com>, Nick Desaulniers <ndesaulniers@google.com> Cc: Julien Thierry <jthierry@redhat.com>, Ard Biesheuvel <ardb@kernel.org>, Mark Brown <broonie@kernel.org>, Catalin Marinas <catalin.marinas@arm.com>, Kees Cook <keescook@chromium.org>, Linux ARM <linux-arm-kernel@lists.infradead.org>, linux-efi <linux-efi@vger.kernel.org>, "linux-hardening@vger.kernel.org" <linux-hardening@vger.kernel.org>, LKML <linux-kernel@vger.kernel.org>, "Mark Rutland" <mark.rutland@arm.com>, Masahiro Yamada <masahiroy@kernel.org>, Michal Marek <michal.lkml@markovi.net>, Peter Zijlstra <peterz@infradead.org>, "raphael.gault@arm.com" <raphael.gault@arm.com>, Will Deacon <will@kernel.org>, clang-built-linux <clang-built-linux@googlegroups.com>, Bill Wendling <morbo@google.com> Subject: RE: [RFC PATCH 12/17] gcc-plugins: objtool: Add plugin to detect switch table on arm64 Date: Tue, 2 Feb 2021 14:24:32 +0000 [thread overview] Message-ID: <7c14b5b8b11241cd8271ba5b3f785c51@AcuMS.aculab.com> (raw) In-Reply-To: <20210202000203.rk7lh5mx4aflgkwr@treble> Stirring more goop into the hole .... Requiring gcc-plugins, matching compiler versions and the same 'dwarf' format for OOT modules is probably very painful. In many cases (and this may include drivers released by some distributions) an OOT driver has two separate parts. One part is C source that is compiled when the module is built on the target system and against the installed kernel headers. Getting this to match 'just' relies on having the correct compiler (etc) installed and in $PATH. The second part is much more problematic. This is just an object file compiled by a third party. It doesn't directly depend on anything defined in the kernel headers - so can (currently) be linked into any kernel version. In the past some graphics drivers have had a third party object file. I think some of the laptop wifi drivers might as well. Now I some people think everything should be free source. But there are various commercial and practical reasons for both OOT drivers and object file 'blobs' in OOT drivers. David - Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK Registration No: 1397386 (Wales)
WARNING: multiple messages have this Message-ID (diff)
From: David Laight <David.Laight@ACULAB.COM> To: 'Josh Poimboeuf' <jpoimboe@redhat.com>, Nick Desaulniers <ndesaulniers@google.com> Cc: Mark Rutland <mark.rutland@arm.com>, Bill Wendling <morbo@google.com>, linux-efi <linux-efi@vger.kernel.org>, Julien Thierry <jthierry@redhat.com>, clang-built-linux <clang-built-linux@googlegroups.com>, Peter Zijlstra <peterz@infradead.org>, Catalin Marinas <catalin.marinas@arm.com>, Masahiro Yamada <masahiroy@kernel.org>, LKML <linux-kernel@vger.kernel.org>, Michal Marek <michal.lkml@markovi.net>, "raphael.gault@arm.com" <raphael.gault@arm.com>, Mark Brown <broonie@kernel.org>, "linux-hardening@vger.kernel.org" <linux-hardening@vger.kernel.org>, Will Deacon <will@kernel.org>, Ard Biesheuvel <ardb@kernel.org>, Linux ARM <linux-arm-kernel@lists.infradead.org>, Kees Cook <keescook@chromium.org> Subject: RE: [RFC PATCH 12/17] gcc-plugins: objtool: Add plugin to detect switch table on arm64 Date: Tue, 2 Feb 2021 14:24:32 +0000 [thread overview] Message-ID: <7c14b5b8b11241cd8271ba5b3f785c51@AcuMS.aculab.com> (raw) In-Reply-To: <20210202000203.rk7lh5mx4aflgkwr@treble> Stirring more goop into the hole .... Requiring gcc-plugins, matching compiler versions and the same 'dwarf' format for OOT modules is probably very painful. In many cases (and this may include drivers released by some distributions) an OOT driver has two separate parts. One part is C source that is compiled when the module is built on the target system and against the installed kernel headers. Getting this to match 'just' relies on having the correct compiler (etc) installed and in $PATH. The second part is much more problematic. This is just an object file compiled by a third party. It doesn't directly depend on anything defined in the kernel headers - so can (currently) be linked into any kernel version. In the past some graphics drivers have had a third party object file. I think some of the laptop wifi drivers might as well. Now I some people think everything should be free source. But there are various commercial and practical reasons for both OOT drivers and object file 'blobs' in OOT drivers. David - Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK Registration No: 1397386 (Wales) _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2021-02-02 14:28 UTC|newest] Thread overview: 106+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-01-20 17:37 [RFC PATCH 00/17] objtool: add base support for arm64 Julien Thierry 2021-01-20 17:37 ` Julien Thierry 2021-01-20 17:37 ` [RFC PATCH 01/17] tools: Add some generic functions and headers Julien Thierry 2021-01-20 17:37 ` Julien Thierry 2021-01-20 17:37 ` [RFC PATCH 02/17] tools: arm64: Make aarch64 instruction decoder available to tools Julien Thierry 2021-01-20 17:37 ` Julien Thierry 2021-01-20 17:37 ` [RFC PATCH 03/17] tools: bug: Remove duplicate definition Julien Thierry 2021-01-20 17:37 ` Julien Thierry 2021-01-20 17:37 ` [RFC PATCH 04/17] objtool: arm64: Add base definition for arm64 backend Julien Thierry 2021-01-20 17:37 ` Julien Thierry 2021-01-20 17:37 ` [RFC PATCH 05/17] objtool: arm64: Decode add/sub instructions Julien Thierry 2021-01-20 17:37 ` Julien Thierry 2021-01-20 17:37 ` [RFC PATCH 06/17] objtool: arm64: Decode jump and call related instructions Julien Thierry 2021-01-20 17:37 ` Julien Thierry 2021-01-20 17:37 ` [RFC PATCH 07/17] objtool: arm64: Decode other system instructions Julien Thierry 2021-01-20 17:37 ` Julien Thierry 2021-01-20 17:37 ` [RFC PATCH 08/17] objtool: arm64: Decode load/store instructions Julien Thierry 2021-01-20 17:37 ` Julien Thierry 2021-01-20 17:37 ` [RFC PATCH 09/17] objtool: arm64: Decode LDR instructions Julien Thierry 2021-01-20 17:37 ` Julien Thierry 2021-01-20 17:37 ` [RFC PATCH 10/17] objtool: arm64: Accept padding in code sections Julien Thierry 2021-01-20 17:37 ` Julien Thierry 2021-01-20 17:37 ` [RFC PATCH 11/17] efi: libstub: Ignore relocations for .discard sections Julien Thierry 2021-01-20 17:37 ` Julien Thierry 2021-01-20 17:37 ` [RFC PATCH 12/17] gcc-plugins: objtool: Add plugin to detect switch table on arm64 Julien Thierry 2021-01-20 17:37 ` Julien Thierry 2021-01-27 22:15 ` Nick Desaulniers 2021-01-27 22:15 ` Nick Desaulniers 2021-01-27 23:26 ` Josh Poimboeuf 2021-01-27 23:26 ` Josh Poimboeuf 2021-01-29 18:10 ` Nick Desaulniers 2021-01-29 18:10 ` Nick Desaulniers 2021-02-01 21:44 ` Josh Poimboeuf 2021-02-01 21:44 ` Josh Poimboeuf 2021-02-01 23:17 ` Nick Desaulniers 2021-02-01 23:17 ` Nick Desaulniers 2021-02-02 0:02 ` Josh Poimboeuf 2021-02-02 0:02 ` Josh Poimboeuf 2021-02-02 14:24 ` David Laight [this message] 2021-02-02 14:24 ` David Laight 2021-02-02 22:33 ` Nick Desaulniers 2021-02-02 22:33 ` Nick Desaulniers 2021-02-02 23:36 ` Josh Poimboeuf 2021-02-02 23:36 ` Josh Poimboeuf 2021-02-02 23:52 ` Nick Desaulniers 2021-02-02 23:52 ` Nick Desaulniers 2021-02-02 8:57 ` Julien Thierry 2021-02-02 8:57 ` Julien Thierry 2021-02-02 23:01 ` Nick Desaulniers 2021-02-02 23:01 ` Nick Desaulniers 2021-02-03 0:14 ` Josh Poimboeuf 2021-02-03 0:14 ` Josh Poimboeuf 2021-02-03 11:57 ` Peter Zijlstra 2021-02-03 11:57 ` Peter Zijlstra 2021-02-03 13:04 ` Mark Brown 2021-02-03 13:04 ` Mark Brown 2021-02-03 13:58 ` Mark Rutland 2021-02-03 13:58 ` Mark Rutland 2021-02-03 8:11 ` Julien Thierry 2021-02-03 8:11 ` Julien Thierry 2021-02-09 16:30 ` Daniel Kiss 2021-02-09 16:30 ` Daniel Kiss 2021-01-20 17:37 ` [RFC PATCH 13/17] objtool: arm64: Implement functions to add switch tables alternatives Julien Thierry 2021-01-20 17:37 ` Julien Thierry 2021-01-20 17:37 ` [RFC PATCH 14/17] objtool: arm64: Cache section with switch table information Julien Thierry 2021-01-20 17:37 ` Julien Thierry 2021-01-20 17:37 ` [RFC PATCH 15/17] objtool: arm64: Handle supported relocations in alternatives Julien Thierry 2021-01-20 17:37 ` Julien Thierry 2021-01-20 17:37 ` [RFC PATCH 16/17] objtool: arm64: Ignore replacement section for alternative callback Julien Thierry 2021-01-20 17:37 ` Julien Thierry 2021-01-20 17:38 ` [RFC PATCH 17/17] objtool: arm64: Enable stack validation for arm64 Julien Thierry 2021-01-20 17:38 ` Julien Thierry 2021-01-21 5:39 ` kernel test robot 2021-01-21 9:03 ` [RFC PATCH 00/17] objtool: add base support " Ard Biesheuvel 2021-01-21 9:03 ` Ard Biesheuvel 2021-01-21 10:26 ` Julien Thierry 2021-01-21 10:26 ` Julien Thierry 2021-01-21 11:08 ` Ard Biesheuvel 2021-01-21 11:08 ` Ard Biesheuvel 2021-01-21 11:23 ` Peter Zijlstra 2021-01-21 11:23 ` Peter Zijlstra 2021-01-21 11:48 ` Ard Biesheuvel 2021-01-21 11:48 ` Ard Biesheuvel 2021-01-21 18:54 ` Josh Poimboeuf 2021-01-21 18:54 ` Josh Poimboeuf 2021-01-22 17:43 ` Mark Brown 2021-01-22 17:43 ` Mark Brown 2021-01-22 17:54 ` Ard Biesheuvel 2021-01-22 17:54 ` Ard Biesheuvel 2021-01-28 22:10 ` Madhavan T. Venkataraman 2021-01-28 22:10 ` Madhavan T. Venkataraman 2021-01-29 15:47 ` Mark Brown 2021-01-22 21:15 ` Madhavan T. Venkataraman 2021-01-22 21:15 ` Madhavan T. Venkataraman 2021-01-22 21:43 ` Ard Biesheuvel 2021-01-22 21:43 ` Ard Biesheuvel 2021-01-22 21:44 ` Madhavan T. Venkataraman 2021-01-22 21:44 ` Madhavan T. Venkataraman 2021-01-25 21:19 ` Josh Poimboeuf 2021-01-25 21:19 ` Josh Poimboeuf 2021-01-22 21:16 ` Madhavan T. Venkataraman 2021-01-22 21:16 ` Madhavan T. Venkataraman 2021-01-21 13:23 ` Julien Thierry 2021-01-21 13:23 ` Julien Thierry 2021-01-21 14:23 ` Mark Brown 2021-01-21 14:23 ` Mark Brown
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