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Message-ID: <Yqh+k7Udth0IOBrd@iki.fi>
Date:   Tue, 14 Jun 2022 15:26:59 +0300
From:   Jarkko Sakkinen <jarkko@...nel.org>
To:     Luis Chamberlain <mcgrof@...nel.org>
Cc:     "Russell King (Oracle)" <linux@...linux.org.uk>,
        "Edgecombe, Rick P" <rick.p.edgecombe@...el.com>,
        Christoph Hellwig <hch@...radead.org>,
        Jarkko Sakkinen <jarkko@...fian.com>,
        linux-kernel@...r.kernel.org,
        Nathaniel McCallum <nathaniel@...fian.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        "James E.J. Bottomley" <James.Bottomley@...senpartnership.com>,
        Helge Deller <deller@....de>,
        Michael Ellerman <mpe@...erman.id.au>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Heiko Carstens <hca@...ux.ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Alexander Gordeev <agordeev@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ux.ibm.com>,
        Sven Schnelle <svens@...ux.ibm.com>,
        "David S. Miller" <davem@...emloft.net>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
        "H. Peter Anvin" <hpa@...or.com>,
        "Naveen N. Rao" <naveen.n.rao@...ux.ibm.com>,
        Anil S Keshavamurthy <anil.s.keshavamurthy@...el.com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Kees Cook <keescook@...omium.org>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Nathan Chancellor <nathan@...nel.org>,
        Josh Poimboeuf <jpoimboe@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        Marco Elver <elver@...gle.com>,
        Dan Li <ashimida@...ux.alibaba.com>,
        Sami Tolvanen <samitolvanen@...gle.com>,
        Song Liu <song@...nel.org>, Ard Biesheuvel <ardb@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Chen Zhongjin <chenzhongjin@...wei.com>,
        Nicolas Pitre <nico@...xnic.net>,
        Mark Brown <broonie@...nel.org>,
        Luis Machado <luis.machado@...aro.org>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Joey Gouly <joey.gouly@....com>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Andrey Konovalov <andreyknvl@...il.com>,
        Kefeng Wang <wangkefeng.wang@...wei.com>,
        Atsushi Nemoto <anemo@....ocn.ne.jp>,
        Guenter Roeck <linux@...ck-us.net>,
        Dave Anglin <dave.anglin@...l.net>,
        Christophe Leroy <christophe.leroy@...roup.eu>,
        Alexei Starovoitov <ast@...nel.org>,
        Nicholas Piggin <npiggin@...il.com>,
        Daniel Axtens <dja@...ens.net>,
        "Aneesh Kumar K.V" <aneesh.kumar@...ux.ibm.com>,
        Jordan Niethe <jniethe5@...il.com>,
        Guo Ren <guoren@...nel.org>, Anup Patel <anup@...infault.org>,
        Atish Patra <atishp@...shpatra.org>,
        Changbin Du <changbin.du@...el.com>,
        Heiko Stuebner <heiko@...ech.de>,
        Liao Chang <liaochang1@...wei.com>,
        Philipp Tomsich <philipp.tomsich@...ll.eu>,
        Wu Caize <zepan@...eed.com>,
        Emil Renner Berthing <kernel@...il.dk>,
        Alexander Egorenkov <egorenar@...ux.ibm.com>,
        Thomas Richter <tmricht@...ux.ibm.com>,
        Tobias Huschle <huschle@...ux.ibm.com>,
        Ilya Leoshkevich <iii@...ux.ibm.com>,
        Tom Lendacky <thomas.lendacky@....com>,
        Daniel Bristot de Oliveira <bristot@...hat.com>,
        Michael Roth <michael.roth@....com>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Javier Martinez Canillas <javierm@...hat.com>,
        Miroslav Benes <mbenes@...e.cz>,
        André Almeida <andrealmeid@...lia.com>,
        Tiezhu Yang <yangtiezhu@...ngson.cn>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Aaron Tomlin <atomlin@...hat.com>,
        linux-arm-kernel@...ts.infradead.org, linux-mips@...r.kernel.org,
        linux-parisc@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        linux-riscv@...ts.infradead.org, linux-s390@...r.kernel.org,
        sparclinux@...r.kernel.org, linux-modules@...r.kernel.org
Subject: Re: [PATCH] kprobes: Enable tracing for mololithic kernel images

On Thu, Jun 09, 2022 at 06:44:45AM -0700, Luis Chamberlain wrote:
> On Thu, Jun 09, 2022 at 08:47:38AM +0100, Russell King (Oracle) wrote:
> > On Wed, Jun 08, 2022 at 02:59:27AM +0300, Jarkko Sakkinen wrote:
> > > diff --git a/arch/arm/kernel/Makefile b/arch/arm/kernel/Makefile
> > > index 553866751e1a..d2bb954cd54f 100644
> > > --- a/arch/arm/kernel/Makefile
> > > +++ b/arch/arm/kernel/Makefile
> > > @@ -44,6 +44,11 @@ obj-$(CONFIG_CPU_IDLE)		+= cpuidle.o
> > >  obj-$(CONFIG_ISA_DMA_API)	+= dma.o
> > >  obj-$(CONFIG_FIQ)		+= fiq.o fiqasm.o
> > >  obj-$(CONFIG_MODULES)		+= armksyms.o module.o
> > > +ifeq ($(CONFIG_MODULES),y)
> > > +obj-y				+= module_alloc.o
> > > +else
> > > +obj-$(CONFIG_KPROBES)		+= module_alloc.o
> > > +endif
> > 
> > Doesn't:
> > 
> > obj-$(CONFIG_MODULES)		+= module_alloc.o
> > obj-$(CONFIG_KPROBES)		+= module_alloc.o
> 
> That just begs for a new kconfig symbol for the object, and for
> the object then to be built with it.
> 
> The archs which override the default can use ARCH_HAS_VM_ALLOC_EXEC.
> Please note that the respective free is important as well and its
> not clear if we need an another define for the free. Someone has
> to do that work. We want to ensure to noexec the code on free and
> this can vary on each arch.

Let me check if I understand this (not 100% sure).

So if arch define ARCH_HAS_VMALLOC_EXEC, then this would set
config flag CONFIG_VMALLOC_EXEC, which would be used to include
the compilation unit?

BR, Jarkko

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