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fs/proc: Skip bootloader comment if no embedded kernel parameters

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commit c722cea208 upstream.

If the "bootconfig" kernel command-line argument was specified or if
the kernel was built with CONFIG_BOOT_CONFIG_FORCE, but if there are
no embedded kernel parameter, omit the "# Parameters from bootloader:"
comment from the /proc/bootconfig file.  This will cause automation
to fall back to the /proc/cmdline file, which will be identical to the
comment in this no-embedded-kernel-parameters case.

Link: https://lore.kernel.org/all/20240409044358.1156477-2-paulmck@kernel.org/

Fixes: 8b8ce6c75430 ("fs/proc: remove redundant comments from /proc/bootconfig")
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Cc: stable@vger.kernel.org
Acked-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Masami Hiramatsu 2024-04-08 21:43:58 -07:00 committed by Greg Kroah-Hartman
parent 0f33fd80e8
commit 786afd51e2
3 changed files with 7 additions and 1 deletions
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2
fs/proc/bootconfig.c
View File

@ -63,7 +63,7 @@ static int __init copy_xbc_key_value_list(char *dst, size_t size)
dst += ret;
}
}
if (ret >= 0 && boot_command_line[0]) {
if (cmdline_has_extra_options() && ret >= 0 && boot_command_line[0]) {
ret = snprintf(dst, rest(dst, end), "# Parameters from bootloader:\n# %s\n",
boot_command_line);
if (ret > 0)

1
include/linux/bootconfig.h
View File

@ -10,6 +10,7 @@
#ifdef __KERNEL__
#include <linux/kernel.h>
#include <linux/types.h>
bool __init cmdline_has_extra_options(void);
#else /* !__KERNEL__ */
/*
* NOTE: This is only for tools/bootconfig, because tools/bootconfig will

5
init/main.c
View File

@ -485,6 +485,11 @@ static int __init warn_bootconfig(char *str)
early_param("bootconfig", warn_bootconfig);
bool __init cmdline_has_extra_options(void)
{
return extra_command_line || extra_init_args;
}
/* Change NUL term back to "=", to make "param" the whole string. */
static void __init repair_env_string(char *param, char *val)
{