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91 lines
4.0 KiB
91 lines
4.0 KiB
6 months ago
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From a30f647ef87e352502dde5ca67ad99927611108a Mon Sep 17 00:00:00 2001
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From: Lennart Poettering <lennart@poettering.net>
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Date: Fri, 11 Nov 2022 16:05:03 +0100
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Subject: [PATCH] efi: add efi_guid_equal() helper
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(cherry picked from commit 50b0b0d351e892d57a562a28dd8362b1e8cd76a9)
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Related: RHEL-16952
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---
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src/boot/efi/devicetree.c | 2 +-
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src/boot/efi/part-discovery.c | 2 +-
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src/boot/efi/random-seed.c | 3 +--
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src/boot/efi/util.h | 4 ++++
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src/boot/efi/vmm.c | 4 ++--
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5 files changed, 9 insertions(+), 6 deletions(-)
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diff --git a/src/boot/efi/devicetree.c b/src/boot/efi/devicetree.c
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index 0312670613..daba5582aa 100644
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--- a/src/boot/efi/devicetree.c
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+++ b/src/boot/efi/devicetree.c
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@@ -10,7 +10,7 @@
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static void *get_dtb_table(void) {
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for (UINTN i = 0; i < ST->NumberOfTableEntries; i++)
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- if (memcmp(&EfiDtbTableGuid, &ST->ConfigurationTable[i].VendorGuid, sizeof(EfiDtbTableGuid)) == 0)
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+ if (efi_guid_equal(&ST->ConfigurationTable[i].VendorGuid, &EfiDtbTableGuid))
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return ST->ConfigurationTable[i].VendorTable;
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return NULL;
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}
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diff --git a/src/boot/efi/part-discovery.c b/src/boot/efi/part-discovery.c
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index 14479c06ea..2659a5b6b4 100644
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--- a/src/boot/efi/part-discovery.c
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+++ b/src/boot/efi/part-discovery.c
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@@ -134,7 +134,7 @@ static EFI_STATUS try_gpt(
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EFI_PARTITION_ENTRY *entry =
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(EFI_PARTITION_ENTRY *) ((uint8_t *) entries + gpt.gpt_header.SizeOfPartitionEntry * i);
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- if (memcmp(&entry->PartitionTypeGUID, type, sizeof(entry->PartitionTypeGUID)) != 0)
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+ if (!efi_guid_equal(&entry->PartitionTypeGUID, type))
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continue;
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if (entry->EndingLBA < entry->StartingLBA) /* Bogus? */
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diff --git a/src/boot/efi/random-seed.c b/src/boot/efi/random-seed.c
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index 4fc56d9356..6070145778 100644
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--- a/src/boot/efi/random-seed.c
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+++ b/src/boot/efi/random-seed.c
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@@ -147,8 +147,7 @@ EFI_STATUS process_random_seed(EFI_FILE *root_dir) {
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sha256_process_bytes(HASH_LABEL, sizeof(HASH_LABEL) - 1, &hash);
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for (size_t i = 0; i < ST->NumberOfTableEntries; ++i)
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- if (memcmp(&(const EFI_GUID)LINUX_EFI_RANDOM_SEED_TABLE_GUID,
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- &ST->ConfigurationTable[i].VendorGuid, sizeof(EFI_GUID)) == 0) {
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+ if (efi_guid_equal(&ST->ConfigurationTable[i].VendorGuid, &(const EFI_GUID) LINUX_EFI_RANDOM_SEED_TABLE_GUID)) {
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previous_seed_table = ST->ConfigurationTable[i].VendorTable;
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break;
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}
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diff --git a/src/boot/efi/util.h b/src/boot/efi/util.h
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index f58d24fce1..a076f48dba 100644
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--- a/src/boot/efi/util.h
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+++ b/src/boot/efi/util.h
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@@ -217,3 +217,7 @@ static inline bool in_hypervisor(void) {
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return false;
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}
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#endif
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+
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+static inline bool efi_guid_equal(const EFI_GUID *a, const EFI_GUID *b) {
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+ return memcmp(a, b, sizeof(EFI_GUID)) == 0;
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+}
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diff --git a/src/boot/efi/vmm.c b/src/boot/efi/vmm.c
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index 2260b217b7..10d4a75ab2 100644
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--- a/src/boot/efi/vmm.c
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+++ b/src/boot/efi/vmm.c
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@@ -18,7 +18,7 @@
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/* detect direct boot */
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bool is_direct_boot(EFI_HANDLE device) {
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EFI_STATUS err;
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- VENDOR_DEVICE_PATH *dp;
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+ VENDOR_DEVICE_PATH *dp; /* NB: Alignment of this structure might be quirky! */
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err = BS->HandleProtocol(device, &DevicePathProtocol, (void **) &dp);
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if (err != EFI_SUCCESS)
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@@ -27,7 +27,7 @@ bool is_direct_boot(EFI_HANDLE device) {
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/* 'qemu -kernel systemd-bootx64.efi' */
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if (dp->Header.Type == MEDIA_DEVICE_PATH &&
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dp->Header.SubType == MEDIA_VENDOR_DP &&
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- memcmp(&dp->Guid, &(EFI_GUID)QEMU_KERNEL_LOADER_FS_MEDIA_GUID, sizeof(EFI_GUID)) == 0)
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+ memcmp(&dp->Guid, &(EFI_GUID)QEMU_KERNEL_LOADER_FS_MEDIA_GUID, sizeof(EFI_GUID)) == 0) /* Don't change to efi_guid_equal() because EFI device path objects are not necessarily aligned! */
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return true;
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/* loaded from firmware volume (sd-boot added to ovmf) */
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