linux-kernel - Re: [PATCH v2] bootconfig: Fix to find the initargs correctly

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Message-Id: <20200805164116.2e396561081e61ef75c1ca51@kernel.org>
Date:   Wed, 5 Aug 2020 16:41:16 +0900
From:   Masami Hiramatsu <mhiramat@...nel.org>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     Arvind Sankar <nivedita@...m.mit.edu>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] bootconfig: Fix to find the initargs correctly

Hi Steve,

On Tue, 4 Aug 2020 16:59:29 -0400
Steven Rostedt <rostedt@...dmis.org> wrote:

> On Tue,  4 Aug 2020 11:52:13 +0900
> Masami Hiramatsu <mhiramat@...nel.org> wrote:
> 
> > 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 '--'
> > even if the kernel command line already has '--'.
> > 
> > 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.
> 
> Thanks Masami,
> 
> I'll start testing this now. I just finished testing everything else I
> had in my queue and pushed it to my for-next branch. Can you check to
> see if I missed anything there?

Yeah, it seems all acked patches are picked up.
I'll move onto the next series.

Thank you!

> 
> -- Steve
> 
> 
> > 
> > Fixes: f61872bb58a1 ("bootconfig: Use parse_args() to find bootconfig and '--'")
> > Cc: stable@...r.kernel.org
> > Reported-by: Arvind Sankar <nivedita@...m.mit.edu>
> > Suggested-by: Arvind Sankar <nivedita@...m.mit.edu>
> > Signed-off-by: Masami Hiramatsu <mhiramat@...nel.org>
> > ---
> >  Changes in v2:
> >   - Remvoe unneede !IS_ERR().
> > ---
> >  init/main.c |   14 ++++++++------
> >  1 file changed, 8 insertions(+), 6 deletions(-)
> > 
> > diff --git a/init/main.c b/init/main.c
> > index 0ead83e86b5a..883ded3638e5 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 (err)
> > +		initargs_found = true;
> > +
> >  	if (!data) {
> >  		pr_err("'bootconfig' found on command line, but no bootconfig found\n");
> >  		return;
> 


-- 
Masami Hiramatsu <mhiramat@...nel.org>