linux-kernel - Re: [PATCH v7 00/10] livepatch: klp-convert tool

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Date:   Fri, 31 Mar 2023 12:03:52 -0400
From:   Joe Lawrence <joe.lawrence@...hat.com>
To:     Alexey Dobriyan <adobriyan@...il.com>
Cc:     live-patching@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-kbuild@...r.kernel.org, Josh Poimboeuf <jpoimboe@...nel.org>,
        Miroslav Benes <mbenes@...e.cz>,
        Petr Mladek <pmladek@...e.com>,
        Marcos Paulo de Souza <mpdesouza@...e.com>
Subject: Re: [PATCH v7 00/10] livepatch: klp-convert tool

On 3/30/23 13:04, Alexey Dobriyan wrote:
> This patchset somehow breaks the build of the simplest livepatch module:
> 
> 	make -f linux/linux-1/scripts/Makefile.modfinal
> 	make[1]: *** No rule to make target 'linux/module-klp/main.tmp.ko', needed by 'linux/module-klp/main.ko'.  Stop.
> 

Thanks for testing.

Presumably this is an out-of-tree livepatch module?  If so, that is
still on the TODO list.  If not, that is weird as the patchset itself
includes updates to samples/ and lib/ livepatches that build and load fine.

-- 
Joe

> $ cat Kbuild
> obj-m := main.o
> 
> $ cat main.c
> #include <linux/module.h>
> #include <linux/kernel.h>
> #include <linux/livepatch.h>
> #include <linux/seq_file.h>
> 
> static int livepatch_cmdline_proc_show(struct seq_file *m, void *data)
> {
> 	seq_puts(m, "REDACTED 001\n");
> 	return 0;
> }
> 
> static struct klp_func funcs[] = {
> 	{
> 		.old_name = "cmdline_proc_show",
> 		.new_func = livepatch_cmdline_proc_show,
> 	},
> 	{}
> };
> 
> static struct klp_object objs[] = {
> 	{
> 		.funcs = funcs,
> 	},
> 	{}
> };
> 
> static struct klp_patch g_patch = {
> 	.mod = THIS_MODULE,
> 	.objs = objs,
> };
> 
> static int livepatch_init(void)
> {
> 	return klp_enable_patch(&g_patch);
> }
> 
> static void livepatch_exit(void)
> {
> }
> module_init(livepatch_init);
> module_exit(livepatch_exit);
> MODULE_LICENSE("GPL");
> MODULE_INFO(livepatch, "Y");
>