The following commit has been merged into the efi/urgent branch of tip:
Commit-ID: fb98cc0b3af2ba4d87301dff2b381b12eee35d7d
Gitweb:
https://git.kernel.org/tip/fb98cc0b3af2ba4d87301dff2b381b12eee35d7d
Author: Ard Biesheuvel <a...@kernel.org>
AuthorDate: Wed, 10 Mar 2021 08:33:19 +01:00
Committer: Ard Biesheuvel <a...@kernel.org>
CommitterDate: Fri, 19 Mar 2021 07:44:28 +01:00
efi: use 32-bit alignment for efi_guid_t literals
Commit 494c704f9af0 ("efi: Use 32-bit alignment for efi_guid_t") updated
the type definition of efi_guid_t to ensure that it always appears
sufficiently aligned (the UEFI spec is ambiguous about this, but given
the fact that its EFI_GUID type is defined in terms of a struct carrying
a uint32_t, the natural alignment is definitely >= 32 bits).
However, we missed the EFI_GUID() macro which is used to instantiate
efi_guid_t literals: that macro is still based on the guid_t type,
which does not have a minimum alignment at all. This results in warnings
such as
In file included from drivers/firmware/efi/mokvar-table.c:35:
include/linux/efi.h:1093:34: warning: passing 1-byte aligned argument to
4-byte aligned parameter 2 of 'get_var' may result in an unaligned pointer
access [-Walign-mismatch]
status = get_var(L"SecureBoot", &EFI_GLOBAL_VARIABLE_GUID, NULL,
&size,
^
include/linux/efi.h:1101:24: warning: passing 1-byte aligned argument to
4-byte aligned parameter 2 of 'get_var' may result in an unaligned pointer
access [-Walign-mismatch]
get_var(L"SetupMode", &EFI_GLOBAL_VARIABLE_GUID, NULL, &size,
&setupmode);
The distinction only matters on CPUs that do not support misaligned loads
fully, but 32-bit ARM's load-multiple instructions fall into that category,
and these are likely to be emitted by the compiler that built the firmware
for loading word-aligned 128-bit GUIDs from memory
So re-implement the initializer in terms of our own efi_guid_t type, so that
the alignment becomes a property of the literal's type.
Fixes: 494c704f9af0 ("efi: Use 32-bit alignment for efi_guid_t")
Reported-by: Nathan Chancellor <nat...@kernel.org>
Reviewed-by: Nick Desaulniers <ndesaulni...@google.com>
Reviewed-by: Nathan Chancellor <nat...@kernel.org>
Tested-by: Nathan Chancellor <nat...@kernel.org>
Link: https://github.com/ClangBuiltLinux/linux/issues/1327
Signed-off-by: Ard Biesheuvel <a...@kernel.org>
---
include/linux/efi.h | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/include/linux/efi.h b/include/linux/efi.h
index 8710f57..6b5d36b 100644
--- a/include/linux/efi.h
+++ b/include/linux/efi.h
@@ -72,8 +72,10 @@ typedef void *efi_handle_t;
*/
typedef guid_t efi_guid_t __aligned(__alignof__(u32));
-#define EFI_GUID(a,b,c,d0,d1,d2,d3,d4,d5,d6,d7) \
- GUID_INIT(a, b, c, d0, d1, d2, d3, d4, d5, d6, d7)
+#define EFI_GUID(a, b, c, d...) (efi_guid_t){ {
\
+ (a) & 0xff, ((a) >> 8) & 0xff, ((a) >> 16) & 0xff, ((a) >> 24) & 0xff,
\
+ (b) & 0xff, ((b) >> 8) & 0xff,
\
+ (c) & 0xff, ((c) >> 8) & 0xff, d } }
/*
* Generic EFI table header
