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Message-ID: <ZwjXz0dz-RldVNx0@infradead.org>
Date: Fri, 11 Oct 2024 00:46:23 -0700
From: Christoph Hellwig <hch@...radead.org>
To: Mike Rapoport <rppt@...nel.org>
Cc: Christoph Hellwig <hch@...radead.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andreas Larsson <andreas@...sler.com>,
	Andy Lutomirski <luto@...nel.org>, Ard Biesheuvel <ardb@...nel.org>,
	Arnd Bergmann <arnd@...db.de>, Borislav Petkov <bp@...en8.de>,
	Brian Cain <bcain@...cinc.com>,
	Catalin Marinas <catalin.marinas@....com>,
	Christophe Leroy <christophe.leroy@...roup.eu>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	Dinh Nguyen <dinguyen@...nel.org>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Guo Ren <guoren@...nel.org>, Helge Deller <deller@....de>,
	Huacai Chen <chenhuacai@...nel.org>, Ingo Molnar <mingo@...hat.com>,
	Johannes Berg <johannes@...solutions.net>,
	John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>,
	Kent Overstreet <kent.overstreet@...ux.dev>,
	"Liam R. Howlett" <Liam.Howlett@...cle.com>,
	Luis Chamberlain <mcgrof@...nel.org>,
	Mark Rutland <mark.rutland@....com>,
	Masami Hiramatsu <mhiramat@...nel.org>,
	Matt Turner <mattst88@...il.com>, Max Filippov <jcmvbkbc@...il.com>,
	Michael Ellerman <mpe@...erman.id.au>,
	Michal Simek <monstr@...str.eu>, Oleg Nesterov <oleg@...hat.com>,
	Palmer Dabbelt <palmer@...belt.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Richard Weinberger <richard@....at>,
	Russell King <linux@...linux.org.uk>, Song Liu <song@...nel.org>,
	Stafford Horne <shorne@...il.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
	Thomas Gleixner <tglx@...utronix.de>,
	Uladzislau Rezki <urezki@...il.com>,
	Vineet Gupta <vgupta@...nel.org>, Will Deacon <will@...nel.org>,
	bpf@...r.kernel.org, linux-alpha@...r.kernel.org,
	linux-arch@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-csky@...r.kernel.org, linux-hexagon@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-m68k@...ts.linux-m68k.org,
	linux-mips@...r.kernel.org, linux-mm@...ck.org,
	linux-modules@...r.kernel.org, linux-openrisc@...r.kernel.org,
	linux-parisc@...r.kernel.org, linux-riscv@...ts.infradead.org,
	linux-sh@...r.kernel.org, linux-snps-arc@...ts.infradead.org,
	linux-trace-kernel@...r.kernel.org, linux-um@...ts.infradead.org,
	linuxppc-dev@...ts.ozlabs.org, loongarch@...ts.linux.dev,
	sparclinux@...r.kernel.org, x86@...nel.org
Subject: Re: [PATCH v5 7/8] execmem: add support for cache of large ROX pages

On Thu, Oct 10, 2024 at 03:57:33PM +0300, Mike Rapoport wrote:
> On Wed, Oct 09, 2024 at 11:58:33PM -0700, Christoph Hellwig wrote:
> > On Wed, Oct 09, 2024 at 09:08:15PM +0300, Mike Rapoport wrote:
> > >  /**
> > >   * struct execmem_info - architecture parameters for code allocations
> > > + * @fill_trapping_insns: set memory to contain instructions that will trap
> > >   * @ranges: array of parameter sets defining architecture specific
> > >   * parameters for executable memory allocations. The ranges that are not
> > >   * explicitly initialized by an architecture use parameters defined for
> > >   * @EXECMEM_DEFAULT.
> > >   */
> > >  struct execmem_info {
> > > +	void (*fill_trapping_insns)(void *ptr, size_t size, bool writable);
> > >  	struct execmem_range	ranges[EXECMEM_TYPE_MAX];
> > 
> > Why is the filler an indirect function call and not an architecture
> > hook?
> 
> The idea is to keep everything together and have execmem_info describe all
> that architecture needs. 

But why?  That's pretty different from our normal style of arch hooks,
and introduces an indirect call in a security sensitive area.


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