linux-kernel - [PATCH v2 8/8] bootconfig: Print array as multiple commands for legacy command line

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Date:   Thu, 20 Feb 2020 21:19:42 +0900
From:   Masami Hiramatsu <mhiramat@...nel.org>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     Geert Uytterhoeven <geert@...ux-m68k.org>,
        Borislav Petkov <bp@...en8.de>,
        LKML <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>
Subject: [PATCH v2 8/8] bootconfig: Print array as multiple commands for legacy command line

Print arraied values as multiple same options for legacy
kernel command line. With this rule, if the "kernel.*" and
"init.*" array entries in bootconfig are printed out as
multiple same options, e.g.

kernel {
 console = "ttyS0,115200"
 console += "tty0"
}

will be correctly converted to

console="ttyS0,115200" console="tty0"

in the kernel command line.

Reported-by: Borislav Petkov <bp@...en8.de>
Signed-off-by: Masami Hiramatsu <mhiramat@...nel.org>
---
 init/main.c |   22 ++++++++--------------
 1 file changed, 8 insertions(+), 14 deletions(-)

diff --git a/init/main.c b/init/main.c
index 821c582af49b..19a5577e0bb0 100644
--- a/init/main.c
+++ b/init/main.c
@@ -268,7 +268,6 @@ static int __init xbc_snprint_cmdline(char *buf, size_t size,
 {
 	struct xbc_node *knode, *vnode;
 	char *end = buf + size;
-	char c = '\"';
 	const char *val;
 	int ret;
 
@@ -279,25 +278,20 @@ static int __init xbc_snprint_cmdline(char *buf, size_t size,
 			return ret;
 
 		vnode = xbc_node_get_child(knode);
-		ret = snprintf(buf, rest(buf, end), "%s%c", xbc_namebuf,
-				vnode ? '=' : ' ');
-		if (ret < 0)
-			return ret;
-		buf += ret;
-		if (!vnode)
+		if (!vnode) {
+			ret = snprintf(buf, rest(buf, end), "%s ", xbc_namebuf);
+			if (ret < 0)
+				return ret;
+			buf += ret;
 			continue;
-
-		c = '\"';
+		}
 		xbc_array_for_each_value(vnode, val) {
-			ret = snprintf(buf, rest(buf, end), "%c%s", c, val);
+			ret = snprintf(buf, rest(buf, end), "%s=\"%s\" ",
+				       xbc_namebuf, val);
 			if (ret < 0)
 				return ret;
 			buf += ret;
-			c = ',';
 		}
-		if (rest(buf, end) > 2)
-			strcpy(buf, "\" ");
-		buf += 2;
 	}
 
 	return buf - (end - size);