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efivarfs: Request at most 512 bytes for variable names 

commit f45812cc23 upstream.

Work around a quirk in a few old (2011-ish) UEFI implementations, where
a call to `GetNextVariableName` with a buffer size larger than 512 bytes
will always return EFI_INVALID_PARAMETER.

There is some lore around EFI variable names being up to 1024 bytes in
size, but this has no basis in the UEFI specification, and the upper
bounds are typically platform specific, and apply to the entire variable
(name plus payload).

Given that Linux does not permit creating files with names longer than
NAME_MAX (255) bytes, 512 bytes (== 256 UTF-16 characters) is a
reasonable limit.

Cc: <stable@vger.kernel.org> # 6.1+
Signed-off-by: Tim Schumacher <timschumi@gmx.de>
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
[timschumi@gmx.de: adjusted diff for changed context and code move]
Signed-off-by: Tim Schumacher <timschumi@gmx.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Tim Schumacher 2024-01-26 17:25:23 +01:00 committed by Greg Kroah-Hartman
parent a2039c87d3
commit a7bd7dbaa2
1 changed files with 11 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

17
drivers/firmware/efi/vars.c
View File

@ -440,7 +440,7 @@ int efivar_init(int (*func)(efi_char16_t *, efi_guid_t, unsigned long, void *),
void *data, bool duplicates, struct list_head *head)
{
const struct efivar_operations *ops;
unsigned long variable_name_size = 1024;
unsigned long variable_name_size = 512;
efi_char16_t *variable_name;
efi_status_t status;
efi_guid_t vendor_guid;
@ -463,12 +463,13 @@ int efivar_init(int (*func)(efi_char16_t *, efi_guid_t, unsigned long, void *),
}
/*
* Per EFI spec, the maximum storage allocated for both
* the variable name and variable data is 1024 bytes.
* A small set of old UEFI implementations reject sizes
* above a certain threshold, the lowest seen in the wild
* is 512.
*/
do {
variable_name_size = 1024;
variable_name_size = 512;
status = ops->get_next_variable(&variable_name_size,
variable_name,
@ -512,9 +513,13 @@ int efivar_init(int (*func)(efi_char16_t *, efi_guid_t, unsigned long, void *),
break;
case EFI_NOT_FOUND:
break;
case EFI_BUFFER_TOO_SMALL:
pr_warn("efivars: Variable name size exceeds maximum (%lu > 512)\n",
variable_name_size);
status = EFI_NOT_FOUND;
break;
default:
printk(KERN_WARNING "efivars: get_next_variable: status=%lx\n",
status);
pr_warn("efivars: get_next_variable: status=%lx\n", status);
status = EFI_NOT_FOUND;
break;
}