linux-kernel - Re: [PATCH v5 01/22] bootconfig: Add Extra Boot Config support

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20200107205945.63e5d35a@rorschach.local.home>
Date:   Tue, 7 Jan 2020 20:59:45 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Masami Hiramatsu <mhiramat@...nel.org>
Cc:     Frank Rowand <frowand.list@...il.com>,
        Ingo Molnar <mingo@...hat.com>,
        Randy Dunlap <rdunlap@...radead.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Tim Bird <Tim.Bird@...y.com>, Jiri Olsa <jolsa@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Tom Zanussi <tom.zanussi@...ux.intel.com>,
        Rob Herring <robh+dt@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Alexey Dobriyan <adobriyan@...il.com>,
        Jonathan Corbet <corbet@....net>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        linux-doc@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 01/22] bootconfig: Add Extra Boot Config support

On Thu, 26 Dec 2019 23:04:00 +0900
Masami Hiramatsu <mhiramat@...nel.org> wrote:


> +/**
> + * xbc_node_is_value() - Test the node is a value node
> + * @node: An XBC node.
> + *
> + * Test the @node is a value node and return true if a value node, false if not.
> + */
> +static inline __init bool xbc_node_is_value(struct xbc_node *node)
> +{
> +	return !!(node->data & XBC_VALUE);

The "!!" is not needed, as this is a static inline bool function. The
compiler will make this a 1 or 0 without it.

	return node->data & XBC_VALUE;

is sufficient.

> +}
> +
> +/**
> + * xbc_node_is_key() - Test the node is a key node
> + * @node: An XBC node.
> + *
> + * Test the @node is a key node and return true if a key node, false if not.
> + */
> +static inline __init bool xbc_node_is_key(struct xbc_node *node)
> +{
> +	return !(node->data & XBC_VALUE);
> +}
> +



> +
> +/*
> + * Return delimiter or error, no node added. As same as lib/cmdline.c,
> + * you can use " around spaces, but can't escape " for value.
> + */
> +static int __init __xbc_parse_value(char **__v, char **__n)
> +{
> +	char *p, *v = *__v;
> +	int c, quotes = 0;
> +
> +	v = skip_spaces(v);
> +	while (*v == '#') {
> +		v = skip_comment(v);
> +		v = skip_spaces(v);
> +	}
> +	if (*v == '"' || *v == '\'') {
> +		quotes = *v;
> +		v++;
> +	}
> +	p = v - 1;
> +	while ((c = *++p)) {
> +		if (!isprint(c) && !isspace(c))
> +			return xbc_parse_error("Non printable value", p);
> +		if (quotes) {
> +			if (c != quotes)
> +				continue;
> +			quotes = 0;
> +			*p++ = '\0';
> +			p = skip_spaces(p);

Hmm, if p here == "    \0" then skip_spaces() will make p == "\0"

> +			c = *p;
> +			if (c && !strchr(",;\n#}", c))
> +				return xbc_parse_error("No value delimiter", p);
> +			p++;

Now p == one passed "\0" which is in unknown territory.

> +			break;
> +		}
> +		if (strchr(",;\n#}", c)) {

Also, why are we looking at '\n'? as wouldn't that get skipped by
skip_spaces() too?

-- Steve

> +			v = strim(v);
> +			*p++ = '\0';
> +			break;
> +		}
> +	}
> +	if (quotes)
> +		return xbc_parse_error("No closing quotes", p);
> +	if (c == '#') {
> +		p = skip_comment(p);
> +		c = *p;
> +	}
> +	*__n = p;
> +	*__v = v;
> +
> +	return c;
> +}
> +