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Date: Fri, 21 Jan 2022 16:08:17 +0100 From: Borislav Petkov <bp@...en8.de> To: Alexander Lobakin <alexandr.lobakin@...el.com> Cc: linux-hardening@...r.kernel.org, x86@...nel.org, Jesse Brandeburg <jesse.brandeburg@...el.com>, Kristen Carlson Accardi <kristen@...ux.intel.com>, Kees Cook <keescook@...omium.org>, Miklos Szeredi <miklos@...redi.hu>, Ard Biesheuvel <ardb@...nel.org>, Tony Luck <tony.luck@...el.com>, Bruce Schlobohm <bruce.schlobohm@...el.com>, Jessica Yu <jeyu@...nel.org>, kernel test robot <lkp@...el.com>, Miroslav Benes <mbenes@...e.cz>, Evgenii Shatokhin <eshatokhin@...tuozzo.com>, Jonathan Corbet <corbet@....net>, Masahiro Yamada <masahiroy@...nel.org>, Michal Marek <michal.lkml@...kovi.net>, Nick Desaulniers <ndesaulniers@...gle.com>, Herbert Xu <herbert@...dor.apana.org.au>, "David S. Miller" <davem@...emloft.net>, Thomas Gleixner <tglx@...utronix.de>, Will Deacon <will@...nel.org>, Ingo Molnar <mingo@...hat.com>, Dave Hansen <dave.hansen@...ux.intel.com>, "H. Peter Anvin" <hpa@...or.com>, Andy Lutomirski <luto@...nel.org>, Peter Zijlstra <peterz@...radead.org>, Arnd Bergmann <arnd@...db.de>, Josh Poimboeuf <jpoimboe@...hat.com>, Nathan Chancellor <nathan@...nel.org>, Masami Hiramatsu <mhiramat@...nel.org>, Marios Pomonis <pomonis@...gle.com>, Sami Tolvanen <samitolvanen@...gle.com>, "H.J. Lu" <hjl.tools@...il.com>, Nicolas Pitre <nico@...xnic.net>, linux-kernel@...r.kernel.org, linux-kbuild@...r.kernel.org, linux-arch@...r.kernel.org, live-patching@...r.kernel.org, llvm@...ts.linux.dev Subject: Re: [PATCH v9 05/15] x86: support ASM function sections On Thu, Dec 23, 2021 at 01:21:59AM +0100, Alexander Lobakin wrote: > Address places which need special care and enable > CONFIG_ARCH_SUPPORTS_ASM_FUNCTION_SECTIONS. > > Notably: > - propagate --sectname-subst to aflags in x86/boot/Makefile and > x86/boot/compressed/Makefile as both override aflags; s/aflags/KBUILD_AFLAGS/ Let's be more precise pls. > - symbols starting with a dot (like ".Lbad_gs") should be handled > manually with SYM_*_START_SECT(.Lbad_gs, bad_gs) as "two dots" > is a special (and CPP doesn't want to concatenate two dots in > general); > - some symbols explicitly need to reside in one section (like > kexec control code, hibernation page etc.); > - macros creating aliases for functions (like __memcpy() for > memcpy() etc.) should go after the main declaration (as > aliases should be declared in the same section and they > don't have SYM_PUSH_SECTION() inside); > - things like ".org", ".align" should be manually pushed to > the same section the next symbol goes to; > - expand indirect_thunk and .fixup wildcards in vmlinux.lds.S $ git grep -E "\.fixup" arch/x86/*.S $ I guess I'll continue with your new version since a bunch of stuff has changed in arch/x86/ in the meantime so that that set would need refreshing. Thx. -- Regards/Gruss, Boris. https://people.kernel.org/tglx/notes-about-netiquette
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