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From: Masami Hiramatsu <mhiramat@kernel.org>
To: Arvind Sankar <nivedita@alum.mit.edu>
Cc: Steven Rostedt <rostedt@goodmis.org>,
	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: Tue, 4 Aug 2020 00:03:45 +0900	[thread overview]
Message-ID: <20200804000345.f5727ac28647aa8c092cc109@kernel.org> (raw)
In-Reply-To: <20200802023318.GA3981683@rani.riverdale.lan>

On Sat, 1 Aug 2020 22:33:18 -0400
Arvind Sankar <nivedita@alum.mit.edu> wrote:

> 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.

Oops, good catch!
Does this fixes the problem?

From b078e8b02ad54aea74f8c3645fc11dd3a1cdc1e7 Mon Sep 17 00:00:00 2001
From: Masami Hiramatsu <mhiramat@kernel.org>
Date: Mon, 3 Aug 2020 23:57:29 +0900
Subject: [PATCH] bootconfig: Fix to find the initargs correctly

Since the parse_args() stops parsing at '--', bootconfig_params()
will never get the '--' as param and initargs_found never be true.
In the result, if we pass some init arguments via the bootconfig,
those are always appended to the kernel command line with '--'
and user will see double '--'.

To fix this correctly, check the return value of parse_args()
and set initargs_found true if the return value is not an error
but a valid address.

Fixes: f61872bb58a1 ("bootconfig: Use parse_args() to find bootconfig and '--'")
Cc: stable@vger.kernel.org
Reported-by: Arvind Sankar <nivedita@alum.mit.edu>
Suggested-by: Arvind Sankar <nivedita@alum.mit.edu>
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
---
 init/main.c | 14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

diff --git a/init/main.c b/init/main.c
index 0ead83e86b5a..627f9230dbe8 100644
--- a/init/main.c
+++ b/init/main.c
@@ -387,8 +387,6 @@ static int __init bootconfig_params(char *param, char *val,
 {
 	if (strcmp(param, "bootconfig") == 0) {
 		bootconfig_found = true;
-	} else if (strcmp(param, "--") == 0) {
-		initargs_found = true;
 	}
 	return 0;
 }
@@ -399,19 +397,23 @@ static void __init setup_boot_config(const char *cmdline)
 	const char *msg;
 	int pos;
 	u32 size, csum;
-	char *data, *copy;
+	char *data, *copy, *err;
 	int ret;
 
 	/* Cut out the bootconfig data even if we have no bootconfig option */
 	data = get_boot_config_from_initrd(&size, &csum);
 
 	strlcpy(tmp_cmdline, boot_command_line, COMMAND_LINE_SIZE);
-	parse_args("bootconfig", tmp_cmdline, NULL, 0, 0, 0, NULL,
-		   bootconfig_params);
+	err = parse_args("bootconfig", tmp_cmdline, NULL, 0, 0, 0, NULL,
+			 bootconfig_params);
 
-	if (!bootconfig_found)
+	if (IS_ERR(err) || !bootconfig_found)
 		return;
 
+	/* parse_args() stops at '--' and returns an address */
+	if (!IS_ERR(err) && err)
+		initargs_found = true;
+
 	if (!data) {
 		pr_err("'bootconfig' found on command line, but no bootconfig found\n");
 		return;
-- 
2.25.1

  reply	other threads:[~2020-08-03 15:03 UTC|newest]

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
2020-08-03 15:03         ` Masami Hiramatsu [this message]
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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