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bootconfig: do not put quotes on cmdline items unless necessary

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When trying to migrate to using bootconfig to embed the kernel's and
PID1's command line with the kernel image itself, and so allowing
changing that without modifying the bootloader, I noticed that
/proc/cmdline changed from e.g.

  console=ttymxc0,115200n8 cma=128M quiet -- --log-level=notice

to

  console="ttymxc0,115200n8" cma="128M" quiet -- --log-level="notice"

The kernel parameters are parsed just fine, and the quotes are indeed
stripped from the actual argv[] given to PID1. However, the quoting
doesn't really serve any purpose and looks excessive, and might
confuse some (naive) userspace tool trying to parse /proc/cmdline. So
do not quote the value unless it contains whitespace.

Link: https://lore.kernel.org/all/20240308124401.1702046-1-linux@rasmusvillemoes.dk/

Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Acked-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
This commit is contained in:
Rasmus Villemoes 2024-04-13 01:02:08 +09:00 committed by Masami Hiramatsu (Google)
parent 46dad3c1e5
commit efee03a50c
1 changed files with 4 additions and 3 deletions
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7
init/main.c
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@ -327,7 +327,7 @@ static int __init xbc_snprint_cmdline(char *buf, size_t size,
{
struct xbc_node *knode, *vnode;
char *end = buf + size;
const char *val;
const char *val, *q;
int ret;
xbc_node_for_each_key_value(root, knode, val) {
@ -345,8 +345,9 @@ static int __init xbc_snprint_cmdline(char *buf, size_t size,
continue;
}
xbc_array_for_each_value(vnode, val) {
ret = snprintf(buf, rest(buf, end), "%s=\"%s\" ",
xbc_namebuf, val);
q = strpbrk(val, " \t\r\n") ? "\"" : "";
ret = snprintf(buf, rest(buf, end), "%s=%s%s%s ",
xbc_namebuf, q, val, q);
if (ret < 0)
return ret;
buf += ret;