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From 8a003f0c495da3719338881286bc2976b2d086aa Mon Sep 17 00:00:00 2001
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From: Peter Jones <pjones@redhat.com>
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Date: Wed, 29 May 2019 10:11:24 -0400
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Subject: [PATCH 21/86] Fix up efi_guid_cmp()'s alignment problem a different
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way
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With the prior fix for efi_guid_cmp()'s alignment issue, abicheck shows:
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1 function with some indirect sub-type change:
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[C]'function int efi_guid_cmp(void* const, void* const)' at <built-in>:34:1 has some indirect sub-type changes:
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parameter 1 of type 'void* const' changed:
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entity changed from 'void* const' to 'const efi_guid_t*'
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type size hasn't changed
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parameter 2 of type 'void* const' changed:
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entity changed from 'void* const' to 'const efi_guid_t*'
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type size hasn't changed
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While this isn't a meaningful ABI difference in terms of linking, it is
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definitely worse than having the type actually specified.
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This patch changes the type back to the previous type, but also changes
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the typedef to require a 1-byte alignment. This will guarantee that all
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new builds of efi_guid_cmp() and related code have code generated in a
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way that's compatible with any alignment, thus alleviating the issue.
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Signed-off-by: Peter Jones <pjones@redhat.com>
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---
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src/guid.c | 2 +-
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src/include/efivar/efivar.h | 4 ++--
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2 files changed, 3 insertions(+), 3 deletions(-)
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diff --git a/src/guid.c b/src/guid.c
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index 3156b3b7c60..306c9ff8287 100644
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--- a/src/guid.c
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+++ b/src/guid.c
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@@ -31,7 +31,7 @@
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extern const efi_guid_t efi_guid_zero;
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int NONNULL(1, 2) PUBLIC
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-efi_guid_cmp(const void * const a, const void * const b)
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+efi_guid_cmp(const efi_guid_t *a, const efi_guid_t *b)
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{
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return memcmp(a, b, sizeof (efi_guid_t));
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}
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diff --git a/src/include/efivar/efivar.h b/src/include/efivar/efivar.h
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index ff95cb10791..11d9a9d7b78 100644
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--- a/src/include/efivar/efivar.h
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+++ b/src/include/efivar/efivar.h
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@@ -37,7 +37,7 @@ typedef struct {
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uint16_t c;
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uint16_t d;
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uint8_t e[6];
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-} efi_guid_t;
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+} efi_guid_t __attribute__((__aligned__(1)));
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typedef struct {
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uint8_t addr[4];
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@@ -128,7 +128,7 @@ extern int efi_symbol_to_guid(const char *symbol, efi_guid_t *guid)
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extern int efi_guid_is_zero(const efi_guid_t *guid);
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extern int efi_guid_is_empty(const efi_guid_t *guid);
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-extern int efi_guid_cmp(const void * const a, const void * const b);
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+extern int efi_guid_cmp(const efi_guid_t *a, const efi_guid_t *b);
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/* import / export functions */
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typedef struct efi_variable efi_variable_t;
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--
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2.24.1
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