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efi: fix return value of __setup handlers

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When "dump_apple_properties" is used on the kernel boot command line,
it causes an Unknown parameter message and the string is added to init's
argument strings:

  Unknown kernel command line parameters "dump_apple_properties
    BOOT_IMAGE=/boot/bzImage-517rc6 efivar_ssdt=newcpu_ssdt", will be
    passed to user space.

 Run /sbin/init as init process
   with arguments:
     /sbin/init
     dump_apple_properties
   with environment:
     HOME=/
     TERM=linux
     BOOT_IMAGE=/boot/bzImage-517rc6
     efivar_ssdt=newcpu_ssdt

Similarly when "efivar_ssdt=somestring" is used, it is added to the
Unknown parameter message and to init's environment strings, polluting
them (see examples above).

Change the return value of the __setup functions to 1 to indicate
that the __setup options have been handled.

Fixes: 58c5475aba ("x86/efi: Retrieve and assign Apple device properties")
Fixes: 475fb4e8b2 ("efi / ACPI: load SSTDs from EFI variables")
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Reported-by: Igor Zhbanov <i.zhbanov@omprussia.ru>
Link: lore.kernel.org/r/64644a2f-4a20-bab3-1e15-3b2cdd0defe3@omprussia.ru
Cc: Ard Biesheuvel <ardb@kernel.org>
Cc: linux-efi@vger.kernel.org
Cc: Lukas Wunner <lukas@wunner.de>
Cc: Octavian Purdila <octavian.purdila@intel.com>
Cc: "Rafael J. Wysocki" <rafael@kernel.org>
Cc: Matt Fleming <matt@codeblueprint.co.uk>
Link: https://lore.kernel.org/r/20220301041851.12459-1-rdunlap@infradead.org
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
This commit is contained in:
Randy Dunlap 2022-02-28 20:18:51 -08:00 committed by Ard Biesheuvel
parent 258dd90202
commit 9feaf8b387
2 changed files with 2 additions and 2 deletions
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2
drivers/firmware/efi/apple-properties.c
View File

@ -24,7 +24,7 @@ static bool dump_properties __initdata;
static int __init dump_properties_enable(char *arg)
{
dump_properties = true;
return 0;
return 1;
}
__setup("dump_apple_properties", dump_properties_enable);

2
drivers/firmware/efi/efi.c
View File

@ -212,7 +212,7 @@ static int __init efivar_ssdt_setup(char *str)
memcpy(efivar_ssdt, str, strlen(str));
else
pr_warn("efivar_ssdt: name too long: %s\n", str);
return 0;
return 1;
}
__setup("efivar_ssdt=", efivar_ssdt_setup);