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From: Arvind Sankar <nivedita@alum.mit.edu>
To: Steven Rostedt <rostedt@goodmis.org>
Cc: Kees Cook <keescook@chromium.org>,
	Masami Hiramatsu <mhiramat@kernel.org>,
	Ingo Molnar <mingo@redhat.com>,
	Frank Rowand <frowand.list@gmail.com>,
	Randy Dunlap <rdunlap@infradead.org>,
	Namhyung Kim <namhyung@kernel.org>, Tim Bird <Tim.Bird@sony.com>,
	Jiri Olsa <jolsa@redhat.com>,
	Arnaldo Carvalho de Melo <acme@kernel.org>,
	Tom Zanussi <tom.zanussi@linux.intel.com>,
	Rob Herring <robh+dt@kernel.org>,
	Andrew Morton <akpm@linux-foundation.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Alexey Dobriyan <adobriyan@gmail.com>,
	Jonathan Corbet <corbet@lwn.net>,
	Linus Torvalds <torvalds@linux-foundation.org>,
	linux-doc@vger.kernel.org, linux-fsdevel@vger.kernel.org,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH v6 08/22] bootconfig: init: Allow admin to use bootconfig for init command line
Date: Sat, 1 Aug 2020 22:33:18 -0400
Message-ID: <20200802023318.GA3981683@rani.riverdale.lan> (raw)
In-Reply-To: <20200207144603.30688b94@oasis.local.home>

On Fri, Feb 07, 2020 at 02:46:03PM -0500, Steven Rostedt wrote:
> 
> diff --git a/init/main.c b/init/main.c
> index 491f1cdb3105..113c8244e5f0 100644
> --- a/init/main.c
> +++ b/init/main.c
> @@ -142,6 +142,15 @@ static char *extra_command_line;
>  /* Extra init arguments */
>  static char *extra_init_args;
>  
> +#ifdef CONFIG_BOOT_CONFIG
> +/* Is bootconfig on command line? */
> +static bool bootconfig_found;
> +static bool initargs_found;
> +#else
> +# define bootconfig_found false
> +# define initargs_found false
> +#endif
> +
>  static char *execute_command;
>  static char *ramdisk_execute_command;
>  
> @@ -336,17 +345,32 @@ u32 boot_config_checksum(unsigned char *p, u32 size)
>  	return ret;
>  }
>  
> +static int __init bootconfig_params(char *param, char *val,
> +				    const char *unused, void *arg)
> +{
> +	if (strcmp(param, "bootconfig") == 0) {
> +		bootconfig_found = true;
> +	} else if (strcmp(param, "--") == 0) {
> +		initargs_found = true;
> +	}
> +	return 0;
> +}
> +

I came across this as I was poking around some of the command line
parsing. AFAICT, initargs_found will never be set to true here, because
parse_args handles "--" itself by immediately returning: it doesn't
invoke the callback for it. So you'd instead have to check the return of
parse_args("bootconfig"...) to detect the initargs_found case.

>  static void __init setup_boot_config(const char *cmdline)
>  {
> +	static char tmp_cmdline[COMMAND_LINE_SIZE] __initdata;
>  	u32 size, csum;
>  	char *data, *copy;
>  	const char *p;
>  	u32 *hdr;
>  	int ret;
>  
> -	p = strstr(cmdline, "bootconfig");
> -	if (!p || (p != cmdline && !isspace(*(p-1))) ||
> -	    (p[10] && !isspace(p[10])))
> +	/* All fall through to do_early_param. */
> +	strlcpy(tmp_cmdline, boot_command_line, COMMAND_LINE_SIZE);
> +	parse_args("bootconfig", tmp_cmdline, NULL, 0, 0, 0, NULL,
> +		   bootconfig_params);
> +
> +	if (!bootconfig_found)
>  		return;

  parent reply index

Thread overview: 40+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-01-10 16:03 [PATCH v6 00/22] tracing: bootconfig: Boot-time tracing and Extra boot config Masami Hiramatsu
2020-01-10 16:03 ` [PATCH v6 01/22] bootconfig: Add Extra Boot Config support Masami Hiramatsu
2020-01-18 18:33   ` Randy Dunlap
2020-01-19 12:23     ` Masami Hiramatsu
2020-01-10 16:03 ` [PATCH v6 02/22] bootconfig: Load boot config from the tail of initrd Masami Hiramatsu
2020-01-10 16:03 ` [PATCH v6 03/22] tools: bootconfig: Add bootconfig command Masami Hiramatsu
2020-01-10 16:04 ` [PATCH v6 04/22] tools: bootconfig: Add bootconfig test script Masami Hiramatsu
2020-01-10 16:04 ` [PATCH v6 05/22] proc: bootconfig: Add /proc/bootconfig to show boot config list Masami Hiramatsu
2020-01-10 16:04 ` [PATCH v6 06/22] init/main.c: Alloc initcall_command_line in do_initcall() and free it Masami Hiramatsu
2020-01-10 16:04 ` [PATCH v6 07/22] bootconfig: init: Allow admin to use bootconfig for kernel command line Masami Hiramatsu
2020-01-10 16:04 ` [PATCH v6 08/22] bootconfig: init: Allow admin to use bootconfig for init " Masami Hiramatsu
2020-02-07 18:03   ` Kees Cook
2020-02-07 19:31     ` Arvind Sankar
2020-02-07 19:46     ` Steven Rostedt
2020-02-08  0:44       ` Kees Cook
2020-08-02  2:33       ` Arvind Sankar [this message]
2020-08-03 15:03         ` Masami Hiramatsu
2020-08-03 15:29           ` Arvind Sankar
2020-08-03 17:22             ` Steven Rostedt
2020-08-04  0:29               ` Masami Hiramatsu
2020-01-10 16:05 ` [PATCH v6 09/22] Documentation: bootconfig: Add a doc for extended boot config Masami Hiramatsu
2020-01-18 18:28   ` Randy Dunlap
2020-01-19 13:36     ` Masami Hiramatsu
2020-01-10 16:05 ` [PATCH v6 10/22] tracing: Apply soft-disabled and filter to tracepoints printk Masami Hiramatsu
2020-01-10 16:05 ` [PATCH v6 11/22] tracing: kprobes: Output kprobe event to printk buffer Masami Hiramatsu
2020-01-10 16:05 ` [PATCH v6 12/22] tracing: kprobes: Register to dynevent earlier stage Masami Hiramatsu
2020-01-10 16:05 ` [PATCH v6 13/22] tracing: Accept different type for synthetic event fields Masami Hiramatsu
2020-01-10 16:06 ` [PATCH v6 14/22] tracing: Add NULL trace-array check in print_synth_event() Masami Hiramatsu
2020-01-10 16:06 ` [PATCH v6 15/22] tracing/boot: Add boot-time tracing Masami Hiramatsu
2020-01-10 16:06 ` [PATCH v6 16/22] tracing/boot: Add per-event settings Masami Hiramatsu
2020-01-10 16:06 ` [PATCH v6 17/22] tracing/boot Add kprobe event support Masami Hiramatsu
2020-01-10 16:06 ` [PATCH v6 18/22] tracing/boot: Add synthetic " Masami Hiramatsu
2020-01-10 16:07 ` [PATCH v6 19/22] tracing/boot: Add instance node support Masami Hiramatsu
2020-01-10 16:07 ` [PATCH v6 20/22] tracing/boot: Add cpu_mask option support Masami Hiramatsu
2020-01-10 16:07 ` [PATCH v6 21/22] tracing/boot: Add function tracer filter options Masami Hiramatsu
2020-01-10 16:07 ` [PATCH v6 22/22] Documentation: tracing: Add boot-time tracing document Masami Hiramatsu
2020-01-18 18:14   ` Randy Dunlap
2020-01-19 14:15     ` Masami Hiramatsu
2020-01-19 14:20 ` [PATCH v6 00/22] tracing: bootconfig: Boot-time tracing and Extra boot config Masami Hiramatsu
2020-01-19 14:59   ` Steven Rostedt

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