[for-linus][PATCH 1/3] bootconfig: Fix to find the initargs correctly

From: Steven Rostedt
Date: Thu Aug 06 2020 - 13:38:58 EST


From: Masami Hiramatsu <mhiramat@xxxxxxxxxx>

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.

Link: https://lkml.kernel.org/r/159650953285.270383.14822353843556363851.stgit@devnote2

Fixes: f61872bb58a1 ("bootconfig: Use parse_args() to find bootconfig and '--'")
Cc: stable@xxxxxxxxxxxxxxx
Reported-by: Arvind Sankar <nivedita@xxxxxxxxxxxx>
Suggested-by: Arvind Sankar <nivedita@xxxxxxxxxxxx>
Signed-off-by: Masami Hiramatsu <mhiramat@xxxxxxxxxx>
Signed-off-by: Steven Rostedt (VMware) <rostedt@xxxxxxxxxxx>
---
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;
--
2.26.2