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efi: Clear up misconceptions about a maximum variable name size

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The UEFI specification does not make any mention of a maximum variable
name size, so the headers and implementation shouldn't claim that one
exists either.

Comments referring to this limit have been removed or rewritten, as this
is an implementation detail local to the Linux kernel.

Where appropriate, the magic value of 1024 has been replaced with
EFI_VAR_NAME_LEN, as this is used for the efi_variable struct
definition. This in itself does not change any behavior, but should
serve as points of interest when making future changes in the same area.

A related build-time check has been added to ensure that the special
512 byte sized buffer will not overflow with a potentially decreased
EFI_VAR_NAME_LEN.

Signed-off-by: Tim Schumacher <timschumi@gmx.de>
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
This commit is contained in:
Tim Schumacher 2024-03-28 21:50:33 +01:00 committed by Ard Biesheuvel
parent 89ea21d70d
commit cda30c6542
3 changed files with 8 additions and 8 deletions
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2
drivers/firmware/efi/vars.c
View File

@ -215,7 +215,7 @@ efi_status_t efivar_set_variable_locked(efi_char16_t *name, efi_guid_t *vendor,
if (data_size > 0) {
status = check_var_size(nonblocking, attr,
data_size + ucs2_strsize(name, 1024));
data_size + ucs2_strsize(name, EFI_VAR_NAME_LEN));
if (status != EFI_SUCCESS)
return status;
}

5
fs/efivarfs/vars.c
View File

@ -295,9 +295,9 @@ static bool variable_is_present(efi_char16_t *variable_name, efi_guid_t *vendor,
unsigned long strsize1, strsize2;
bool found = false;
strsize1 = ucs2_strsize(variable_name, 1024);
strsize1 = ucs2_strsize(variable_name, EFI_VAR_NAME_LEN);
list_for_each_entry_safe(entry, n, head, list) {
strsize2 = ucs2_strsize(entry->var.VariableName, 1024);
strsize2 = ucs2_strsize(entry->var.VariableName, EFI_VAR_NAME_LEN);
if (strsize1 == strsize2 &&
!memcmp(variable_name, &(entry->var.VariableName),
strsize2) &&
@ -396,6 +396,7 @@ int efivar_init(int (*func)(efi_char16_t *, efi_guid_t, unsigned long, void *,
do {
variable_name_size = 512;
BUILD_BUG_ON(EFI_VAR_NAME_LEN < 512);
status = efivar_get_next_variable(&variable_name_size,
variable_name,

9
include/linux/efi.h
View File

@ -1072,12 +1072,11 @@ static inline u64 efivar_reserved_space(void) { return 0; }
#endif
/*
* The maximum size of VariableName + Data = 1024
* Therefore, it's reasonable to save that much
* space in each part of the structure,
* and we use a page for reading/writing.
* There is no actual upper limit specified for the variable name size.
*
* This limit exists only for practical purposes, since name conversions
* are bounds-checked and name data is occasionally stored in-line.
*/
#define EFI_VAR_NAME_LEN 1024
int efivars_register(struct efivars *efivars,