[PATCH v2 2/2] init/Kconfig: make config INIT_ENV_ARG_LIMIT user-configurable

[Wilson Felipe Pereira <wfelipe@google.com>]

INIT_ENV_ARG_LIMIT is defined without a prompt string (`int`), making it
a hidden Kconfig symbol that defaults to 32 (or 128 for UML) and cannot
be configured in `make menuconfig`.

Now that CONFIG_COMMAND_LINE_SIZE is configurable across all architectures,
users who select larger kernel command lines (e.g., 4096 bytes) may pass
more than 32 command-line arguments or environment variables (`foo=bar`) to
`/sbin/init`. If INIT_ENV_ARG_LIMIT remains hardcoded at 32, any argument
after the 32nd sets the panic_later flag and causes a hard kernel panic
on boot.

Add a prompt string ("Maximum number of kernel command line arguments") and
a `range 32 4096` to `config INIT_ENV_ARG_LIMIT` so that users can
configure their init argument and environment variable limit when needed,
while preserving the existing default of 32 for standard builds.

Signed-off-by: Maciej Żenczykowski <maze@google.com>
Signed-off-by: Wilson Felipe Pereira <wfelipe@google.com>
---
 init/Kconfig | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/init/Kconfig b/init/Kconfig
index d03d42ecb0e9..bdd66dc7f628 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -231,9 +231,10 @@ config BROKEN_ON_SMP
 	default y
 
 config INIT_ENV_ARG_LIMIT
-	int
+	int "Maximum number of kernel command line arguments"
 	default 32 if !UML
 	default 128 if UML
+	range 32 4096
 	help
 	  Maximum of each of the number of arguments and environment
 	  variables passed to init from the kernel command line.
-- 
2.55.0.737.g08866a6d13-goog