linux-kernel - Re: [RFC PATCH 5/7] x86/module: perpare module loading for ROX allocations of text

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Message-ID: <Zhj58NVS/iQnPeIq@gmail.com>
Date: Fri, 12 Apr 2024 11:08:00 +0200
From: Ingo Molnar <mingo@...nel.org>
To: Mike Rapoport <rppt@...nel.org>
Cc: linux-kernel@...r.kernel.org, Andrew Morton <akpm@...ux-foundation.org>,
	Andy Lutomirski <luto@...nel.org>, Arnd Bergmann <arnd@...db.de>,
	Catalin Marinas <catalin.marinas@....com>,
	Christoph Hellwig <hch@...radead.org>, Helge Deller <deller@....de>,
	Lorenzo Stoakes <lstoakes@...il.com>,
	Luis Chamberlain <mcgrof@...nel.org>,
	Mark Rutland <mark.rutland@....com>,
	Masami Hiramatsu <mhiramat@...nel.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Michael Ellerman <mpe@...erman.id.au>,
	Palmer Dabbelt <palmer@...belt.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Russell King <linux@...linux.org.uk>, Song Liu <song@...nel.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Uladzislau Rezki <urezki@...il.com>, Will Deacon <will@...nel.org>,
	bpf@...r.kernel.org, linux-arch@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-mm@...ck.org,
	linux-modules@...r.kernel.org, linux-parisc@...r.kernel.org,
	linux-riscv@...ts.infradead.org, linux-trace-kernel@...r.kernel.org,
	linuxppc-dev@...ts.ozlabs.org, x86@...nel.org
Subject: Re: [RFC PATCH 5/7] x86/module: perpare module loading for ROX
 allocations of text


* Mike Rapoport <rppt@...nel.org> wrote:

>  	for (s = start; s < end; s++) {
>  		void *addr = (void *)s + *s;
> +		void *wr_addr = addr + module_writable_offset(mod, addr);

So instead of repeating this pattern in a dozen of places, why not use a 
simpler method:

		void *wr_addr = module_writable_address(mod, addr);

or so, since we have to pass 'addr' to the module code anyway.

The text patching code is pretty complex already.

Thanks,

	Ingo