linux-hardening - [RFC PATCH 4/9] ACPI: tables: change section_type of generic error data as guid

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Message-Id: <20230916130316.65815-5-xueshuai@linux.alibaba.com>
Date:   Sat, 16 Sep 2023 21:03:11 +0800
From:   Shuai Xue <xueshuai@...ux.alibaba.com>
To:     keescook@...omium.org, tony.luck@...el.com, gpiccoli@...lia.com,
        rafael@...nel.org, lenb@...nel.org, james.morse@....com,
        bp@...en8.de, tglx@...utronix.de, mingo@...hat.com,
        dave.hansen@...ux.intel.com, x86@...nel.org, hpa@...or.com,
        ardb@...nel.org, robert.moore@...el.com
Cc:     linux-hardening@...r.kernel.org, linux-acpi@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-edac@...r.kernel.org,
        linux-efi@...r.kernel.org, acpica-devel@...ts.linuxfoundation.org,
        xueshuai@...ux.alibaba.com, baolin.wang@...ux.alibaba.com
Subject: [RFC PATCH 4/9] ACPI: tables: change section_type of generic error data as guid_t

The section_type of generic error data is now an array of u8. It is a
burden to perform explicit type casting from u8[] to guid_t, and to copy
the guid_t values to u8[] using memcpy.

To alleviate this issue, change the section_type from an array to the
type guid_t, which is also consistent with the cper_section_descriptor.

Signed-off-by: Shuai Xue <xueshuai@...ux.alibaba.com>
---
 drivers/acpi/acpi_extlog.c  | 2 +-
 drivers/acpi/apei/ghes.c    | 2 +-
 drivers/firmware/efi/cper.c | 2 +-
 include/acpi/actbl1.h       | 5 +++--
 4 files changed, 6 insertions(+), 5 deletions(-)

diff --git a/drivers/acpi/acpi_extlog.c b/drivers/acpi/acpi_extlog.c
index e120a96e1eae..d46435792d64 100644
--- a/drivers/acpi/acpi_extlog.c
+++ b/drivers/acpi/acpi_extlog.c
@@ -170,7 +170,7 @@ static int extlog_print(struct notifier_block *nb, unsigned long val,
 			fru_text = gdata->fru_text;
 		else
 			fru_text = "";
-		sec_type = (guid_t *)gdata->section_type;
+		sec_type = &gdata->section_type;
 		if (guid_equal(sec_type, &CPER_SEC_PLATFORM_MEM)) {
 			struct cper_sec_mem_err *mem = acpi_hest_get_payload(gdata);
 
diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c
index ef59d6ea16da..d14e00751161 100644
--- a/drivers/acpi/apei/ghes.c
+++ b/drivers/acpi/apei/ghes.c
@@ -648,7 +648,7 @@ static bool ghes_do_proc(struct ghes *ghes,
 
 	sev = ghes_severity(estatus->error_severity);
 	apei_estatus_for_each_section(estatus, gdata) {
-		sec_type = (guid_t *)gdata->section_type;
+		sec_type = &gdata->section_type;
 		sec_sev = ghes_severity(gdata->error_severity);
 		if (gdata->validation_bits & CPER_SEC_VALID_FRU_ID)
 			fru_id = (guid_t *)gdata->fru_id;
diff --git a/drivers/firmware/efi/cper.c b/drivers/firmware/efi/cper.c
index 35c37f667781..a2ba70aa928f 100644
--- a/drivers/firmware/efi/cper.c
+++ b/drivers/firmware/efi/cper.c
@@ -527,7 +527,7 @@ static void
 cper_estatus_print_section(const char *pfx, struct acpi_hest_generic_data *gdata,
 			   int sec_no)
 {
-	guid_t *sec_type = (guid_t *)gdata->section_type;
+	guid_t *sec_type = &gdata->section_type;
 	__u16 severity;
 	char newpfx[64];
 
diff --git a/include/acpi/actbl1.h b/include/acpi/actbl1.h
index 8d5572ad48cb..ab25a8495a43 100644
--- a/include/acpi/actbl1.h
+++ b/include/acpi/actbl1.h
@@ -19,6 +19,7 @@
  *
  ******************************************************************************/
 
+#include <linux/uuid.h>
 /*
  * Values for description table header signatures for tables defined in this
  * file. Useful because they make it more difficult to inadvertently type in
@@ -1637,7 +1638,7 @@ struct acpi_hest_generic_status {
 /* Generic Error Data entry */
 
 struct acpi_hest_generic_data {
-	u8 section_type[16];
+	guid_t section_type;
 	u32 error_severity;
 	u16 revision;
 	u8 validation_bits;
@@ -1650,7 +1651,7 @@ struct acpi_hest_generic_data {
 /* Extension for revision 0x0300 */
 
 struct acpi_hest_generic_data_v300 {
-	u8 section_type[16];
+	guid_t section_type;
 	u32 error_severity;
 	u16 revision;
 	u8 validation_bits;
-- 
2.41.0