From bf514327c324bc8af64f359b341cc9b189c096fd Mon Sep 17 00:00:00 2001 From: "Borislav Petkov (AMD)" Date: Tue, 30 Jul 2024 16:15:12 +0200 Subject: x86/setup: Parse the builtin command line before merging Commit in Fixes was added as a catch-all for cases where the cmdline is parsed before being merged with the builtin one. And promptly one issue appeared, see Link below. The microcode loader really needs to parse it that early, but the merging happens later. Reshuffling the early boot nightmare^W code to handle that properly would be a painful exercise for another day so do the chicken thing and parse the builtin cmdline too before it has been merged. Fixes: 0c40b1c7a897 ("x86/setup: Warn when option parsing is done too early") Reported-by: Mike Lothian Signed-off-by: Borislav Petkov (AMD) Signed-off-by: Thomas Gleixner Reviewed-by: Thomas Gleixner Link: https://lore.kernel.org/all/20240730152108.GAZqkE5Dfi9AuKllRw@fat_crate.local Link: https://lore.kernel.org/r/20240722152330.GCZp55ck8E_FT4kPnC@fat_crate.local --- arch/x86/include/asm/cmdline.h | 4 ++++ arch/x86/kernel/setup.c | 2 +- arch/x86/lib/cmdline.c | 25 ++++++++++++++++++------- 3 files changed, 23 insertions(+), 8 deletions(-) (limited to 'arch/x86') diff --git a/arch/x86/include/asm/cmdline.h b/arch/x86/include/asm/cmdline.h index 6faaf27e8899..6cbd9ae58b21 100644 --- a/arch/x86/include/asm/cmdline.h +++ b/arch/x86/include/asm/cmdline.h @@ -2,6 +2,10 @@ #ifndef _ASM_X86_CMDLINE_H #define _ASM_X86_CMDLINE_H +#include + +extern char builtin_cmdline[COMMAND_LINE_SIZE]; + int cmdline_find_option_bool(const char *cmdline_ptr, const char *option); int cmdline_find_option(const char *cmdline_ptr, const char *option, char *buffer, int bufsize); diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c index 5d34cad9b7b1..6129dc2ba784 100644 --- a/arch/x86/kernel/setup.c +++ b/arch/x86/kernel/setup.c @@ -164,7 +164,7 @@ 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; +char builtin_cmdline[COMMAND_LINE_SIZE] = CONFIG_CMDLINE; bool builtin_cmdline_added __ro_after_init; #endif diff --git a/arch/x86/lib/cmdline.c b/arch/x86/lib/cmdline.c index 384da1fdd5c6..c65cd5550454 100644 --- a/arch/x86/lib/cmdline.c +++ b/arch/x86/lib/cmdline.c @@ -207,18 +207,29 @@ __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); + int ret; - return __cmdline_find_option_bool(cmdline, COMMAND_LINE_SIZE, option); + ret = __cmdline_find_option_bool(cmdline, COMMAND_LINE_SIZE, option); + if (ret > 0) + return ret; + + if (IS_ENABLED(CONFIG_CMDLINE_BOOL) && !builtin_cmdline_added) + return __cmdline_find_option_bool(builtin_cmdline, COMMAND_LINE_SIZE, option); + + return ret; } 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); + int ret; + + ret = __cmdline_find_option(cmdline, COMMAND_LINE_SIZE, option, buffer, bufsize); + if (ret > 0) + return ret; + + if (IS_ENABLED(CONFIG_CMDLINE_BOOL) && !builtin_cmdline_added) + return __cmdline_find_option(builtin_cmdline, COMMAND_LINE_SIZE, option, buffer, bufsize); - return __cmdline_find_option(cmdline, COMMAND_LINE_SIZE, option, - buffer, bufsize); + return ret; } -- cgit v1.2.3-70-g09d2