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x86/setup: Warn when option parsing is done too early

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  4faa0e5d6d ("x86/boot: Move kernel cmdline setup earlier in the boot process (again)")

fixed and issue where cmdline parsing would happen before the final
boot_command_line string has been built from the builtin and boot
cmdlines and thus cmdline arguments would get lost.

Add a check to catch any future wrong use ordering so that such issues
can be caught in time.

Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Acked-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20240409152541.GCZhVd9XIPXyTNd9vc@fat_crate.local
This commit is contained in:
Borislav Petkov (AMD) 2024-04-08 19:46:03 +02:00
parent 52cccc64cf
commit 0c40b1c7a8
3 changed files with 18 additions and 0 deletions
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8
arch/x86/include/asm/setup.h
View File

@ -28,6 +28,8 @@
#define NEW_CL_POINTER 0x228 /* Relative to real mode data */
#ifndef __ASSEMBLY__
#include <linux/cache.h>
#include <asm/bootparam.h>
#include <asm/x86_init.h>
@ -133,6 +135,12 @@ asmlinkage void __init __noreturn x86_64_start_reservations(char *real_mode_data
#endif /* __i386__ */
#endif /* _SETUP */
#ifdef CONFIG_CMDLINE_BOOL
extern bool builtin_cmdline_added __ro_after_init;
#else
#define builtin_cmdline_added 0
#endif
#else /* __ASSEMBLY */
.macro __RESERVE_BRK name, size

2
arch/x86/kernel/setup.c
View File

@ -165,6 +165,7 @@ unsigned long saved_video_mode;
static char __initdata command_line[COMMAND_LINE_SIZE];
#ifdef CONFIG_CMDLINE_BOOL
static char __initdata builtin_cmdline[COMMAND_LINE_SIZE] = CONFIG_CMDLINE;
bool builtin_cmdline_added __ro_after_init;
#endif
#if defined(CONFIG_EDD) || defined(CONFIG_EDD_MODULE)
@ -765,6 +766,7 @@ void __init setup_arch(char **cmdline_p)
strscpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
}
#endif
builtin_cmdline_added = true;
#endif
strscpy(command_line, boot_command_line, COMMAND_LINE_SIZE);

8
arch/x86/lib/cmdline.c
View File

@ -6,8 +6,10 @@
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/ctype.h>
#include <asm/setup.h>
#include <asm/cmdline.h>
#include <asm/bug.h>
static inline int myisspace(u8 c)
{
@ -205,12 +207,18 @@ __cmdline_find_option(const char *cmdline, int max_cmdline_size,
int cmdline_find_option_bool(const char *cmdline, const char *option)
{
if (IS_ENABLED(CONFIG_CMDLINE_BOOL))
WARN_ON_ONCE(!builtin_cmdline_added);
return __cmdline_find_option_bool(cmdline, COMMAND_LINE_SIZE, option);
}
int cmdline_find_option(const char *cmdline, const char *option, char *buffer,
int bufsize)
{
if (IS_ENABLED(CONFIG_CMDLINE_BOOL))
WARN_ON_ONCE(!builtin_cmdline_added);
return __cmdline_find_option(cmdline, COMMAND_LINE_SIZE, option,
buffer, bufsize);
}