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Message-ID: <aEneid7gdAZr1_kR@kspp>
Date: Wed, 11 Jun 2025 13:52:41 -0600
From: "Gustavo A. R. Silva" <gustavoars@...nel.org>
To: Dan Williams <dan.j.williams@...el.com>,
Vishal Verma <vishal.l.verma@...el.com>,
Dave Jiang <dave.jiang@...el.com>, Ira Weiny <ira.weiny@...el.com>,
"Rafael J. Wysocki" <rafael@...nel.org>,
Len Brown <lenb@...nel.org>
Cc: nvdimm@...ts.linux.dev, linux-acpi@...r.kernel.org,
linux-kernel@...r.kernel.org,
"Gustavo A. R. Silva" <gustavoars@...nel.org>,
linux-hardening@...r.kernel.org, Kees Cook <kees@...nel.org>
Subject: [PATCH v3][next] acpi: nfit: intel: avoid multiple
-Wflex-array-member-not-at-end warnings
-Wflex-array-member-not-at-end was introduced in GCC-14, and we are
getting ready to enable it, globally.
Refactor multiple structs that contain flexible-array members in the
middle by replacing them with unions.
These changes preserve the memory layout while effectively adjusting
it so that the flexible-array member is always treated as the last
member.
With these changes, fix a dozen instances of the following type of
warning:
drivers/acpi/nfit/intel.c:692:35: warning: structure containing a flexible array member is not at the end of another structure [-Wflex-array-member-not-at-end]
Signed-off-by: Gustavo A. R. Silva <gustavoars@...nel.org>
---
Changes in v3:
- Use union instead of DEFINE_RAW_FLEX().
Changes in v2:
- Use DEFINE_RAW_FLEX() instead of __struct_group().
- Link: https://lore.kernel.org/linux-hardening/Z-QpUcxFCRByYcTA@kspp/
v1:
- Link: https://lore.kernel.org/linux-hardening/Z618ILbAR8YAvTkd@kspp/
drivers/acpi/nfit/intel.c | 132 +++++++++++++++++++++++++++++++-------
1 file changed, 108 insertions(+), 24 deletions(-)
diff --git a/drivers/acpi/nfit/intel.c b/drivers/acpi/nfit/intel.c
index 3902759abcba..987d427ec2b6 100644
--- a/drivers/acpi/nfit/intel.c
+++ b/drivers/acpi/nfit/intel.c
@@ -55,9 +55,16 @@ static unsigned long intel_security_flags(struct nvdimm *nvdimm,
{
struct nfit_mem *nfit_mem = nvdimm_provider_data(nvdimm);
unsigned long security_flags = 0;
- struct {
+ /*
+ * This effectively creates a union between the flexible-array member
+ * and any members after _offset_to_fam.
+ */
+ union {
struct nd_cmd_pkg pkg;
- struct nd_intel_get_security_state cmd;
+ struct {
+ u8 _offset_to_fam[offsetof(struct nd_cmd_pkg, nd_payload)];
+ struct nd_intel_get_security_state cmd;
+ };
} nd_cmd = {
.pkg = {
.nd_command = NVDIMM_INTEL_GET_SECURITY_STATE,
@@ -120,9 +127,16 @@ static unsigned long intel_security_flags(struct nvdimm *nvdimm,
static int intel_security_freeze(struct nvdimm *nvdimm)
{
struct nfit_mem *nfit_mem = nvdimm_provider_data(nvdimm);
- struct {
+ /*
+ * This effectively creates a union between the flexible-array member
+ * and any members after _offset_to_fam.
+ */
+ union {
struct nd_cmd_pkg pkg;
- struct nd_intel_freeze_lock cmd;
+ struct {
+ u8 _offset_to_fam[offsetof(struct nd_cmd_pkg, nd_payload)];
+ struct nd_intel_freeze_lock cmd;
+ };
} nd_cmd = {
.pkg = {
.nd_command = NVDIMM_INTEL_FREEZE_LOCK,
@@ -153,9 +167,16 @@ static int intel_security_change_key(struct nvdimm *nvdimm,
unsigned int cmd = ptype == NVDIMM_MASTER ?
NVDIMM_INTEL_SET_MASTER_PASSPHRASE :
NVDIMM_INTEL_SET_PASSPHRASE;
- struct {
+ /*
+ * This effectively creates a union between the flexible-array member
+ * and any members after _offset_to_fam.
+ */
+ union {
struct nd_cmd_pkg pkg;
- struct nd_intel_set_passphrase cmd;
+ struct {
+ u8 _offset_to_fam[offsetof(struct nd_cmd_pkg, nd_payload)];
+ struct nd_intel_set_passphrase cmd;
+ };
} nd_cmd = {
.pkg = {
.nd_family = NVDIMM_FAMILY_INTEL,
@@ -195,9 +216,16 @@ static int __maybe_unused intel_security_unlock(struct nvdimm *nvdimm,
const struct nvdimm_key_data *key_data)
{
struct nfit_mem *nfit_mem = nvdimm_provider_data(nvdimm);
- struct {
+ /*
+ * This effectively creates a union between the flexible-array member
+ * and any members after _offset_to_fam.
+ */
+ union {
struct nd_cmd_pkg pkg;
- struct nd_intel_unlock_unit cmd;
+ struct {
+ u8 _offset_to_fam[offsetof(struct nd_cmd_pkg, nd_payload)];
+ struct nd_intel_unlock_unit cmd;
+ };
} nd_cmd = {
.pkg = {
.nd_command = NVDIMM_INTEL_UNLOCK_UNIT,
@@ -234,9 +262,16 @@ static int intel_security_disable(struct nvdimm *nvdimm,
{
int rc;
struct nfit_mem *nfit_mem = nvdimm_provider_data(nvdimm);
- struct {
+ /*
+ * This effectively creates a union between the flexible-array member
+ * and any members after _offset_to_fam.
+ */
+ union {
struct nd_cmd_pkg pkg;
- struct nd_intel_disable_passphrase cmd;
+ struct {
+ u8 _offset_to_fam[offsetof(struct nd_cmd_pkg, nd_payload)];
+ struct nd_intel_disable_passphrase cmd;
+ };
} nd_cmd = {
.pkg = {
.nd_command = NVDIMM_INTEL_DISABLE_PASSPHRASE,
@@ -277,9 +312,16 @@ static int __maybe_unused intel_security_erase(struct nvdimm *nvdimm,
struct nfit_mem *nfit_mem = nvdimm_provider_data(nvdimm);
unsigned int cmd = ptype == NVDIMM_MASTER ?
NVDIMM_INTEL_MASTER_SECURE_ERASE : NVDIMM_INTEL_SECURE_ERASE;
- struct {
+ /*
+ * This effectively creates a union between the flexible-array member
+ * and any members after _offset_to_fam.
+ */
+ union {
struct nd_cmd_pkg pkg;
- struct nd_intel_secure_erase cmd;
+ struct {
+ u8 _offset_to_fam[offsetof(struct nd_cmd_pkg, nd_payload)];
+ struct nd_intel_secure_erase cmd;
+ };
} nd_cmd = {
.pkg = {
.nd_family = NVDIMM_FAMILY_INTEL,
@@ -318,9 +360,16 @@ static int __maybe_unused intel_security_query_overwrite(struct nvdimm *nvdimm)
{
int rc;
struct nfit_mem *nfit_mem = nvdimm_provider_data(nvdimm);
- struct {
+ /*
+ * This effectively creates a union between the flexible-array member
+ * and any members after _offset_to_fam.
+ */
+ union {
struct nd_cmd_pkg pkg;
- struct nd_intel_query_overwrite cmd;
+ struct {
+ u8 _offset_to_fam[offsetof(struct nd_cmd_pkg, nd_payload)];
+ struct nd_intel_query_overwrite cmd;
+ };
} nd_cmd = {
.pkg = {
.nd_command = NVDIMM_INTEL_QUERY_OVERWRITE,
@@ -354,9 +403,16 @@ static int __maybe_unused intel_security_overwrite(struct nvdimm *nvdimm,
{
int rc;
struct nfit_mem *nfit_mem = nvdimm_provider_data(nvdimm);
- struct {
+ /*
+ * This effectively creates a union between the flexible-array member
+ * and any members after _offset_to_fam.
+ */
+ union {
struct nd_cmd_pkg pkg;
- struct nd_intel_overwrite cmd;
+ struct {
+ u8 _offset_to_fam[offsetof(struct nd_cmd_pkg, nd_payload)];
+ struct nd_intel_overwrite cmd;
+ };
} nd_cmd = {
.pkg = {
.nd_command = NVDIMM_INTEL_OVERWRITE,
@@ -407,9 +463,16 @@ const struct nvdimm_security_ops *intel_security_ops = &__intel_security_ops;
static int intel_bus_fwa_businfo(struct nvdimm_bus_descriptor *nd_desc,
struct nd_intel_bus_fw_activate_businfo *info)
{
- struct {
+ /*
+ * This effectively creates a union between the flexible-array member
+ * and any members after _offset_to_fam.
+ */
+ union {
struct nd_cmd_pkg pkg;
- struct nd_intel_bus_fw_activate_businfo cmd;
+ struct {
+ u8 _offset_to_fam[offsetof(struct nd_cmd_pkg, nd_payload)];
+ struct nd_intel_bus_fw_activate_businfo cmd;
+ };
} nd_cmd = {
.pkg = {
.nd_command = NVDIMM_BUS_INTEL_FW_ACTIVATE_BUSINFO,
@@ -518,9 +581,16 @@ static enum nvdimm_fwa_capability intel_bus_fwa_capability(
static int intel_bus_fwa_activate(struct nvdimm_bus_descriptor *nd_desc)
{
struct acpi_nfit_desc *acpi_desc = to_acpi_desc(nd_desc);
- struct {
+ /*
+ * This effectively creates a union between the flexible-array member
+ * and any members after _offset_to_fam.
+ */
+ union {
struct nd_cmd_pkg pkg;
- struct nd_intel_bus_fw_activate cmd;
+ struct {
+ u8 _offset_to_fam[offsetof(struct nd_cmd_pkg, nd_payload)];
+ struct nd_intel_bus_fw_activate cmd;
+ };
} nd_cmd = {
.pkg = {
.nd_command = NVDIMM_BUS_INTEL_FW_ACTIVATE,
@@ -582,9 +652,16 @@ const struct nvdimm_bus_fw_ops *intel_bus_fw_ops = &__intel_bus_fw_ops;
static int intel_fwa_dimminfo(struct nvdimm *nvdimm,
struct nd_intel_fw_activate_dimminfo *info)
{
- struct {
+ /*
+ * This effectively creates a union between the flexible-array member
+ * and any members after _offset_to_fam.
+ */
+ union {
struct nd_cmd_pkg pkg;
- struct nd_intel_fw_activate_dimminfo cmd;
+ struct {
+ u8 _offset_to_fam[offsetof(struct nd_cmd_pkg, nd_payload)];
+ struct nd_intel_fw_activate_dimminfo cmd;
+ };
} nd_cmd = {
.pkg = {
.nd_command = NVDIMM_INTEL_FW_ACTIVATE_DIMMINFO,
@@ -688,9 +765,16 @@ static int intel_fwa_arm(struct nvdimm *nvdimm, enum nvdimm_fwa_trigger arm)
{
struct nfit_mem *nfit_mem = nvdimm_provider_data(nvdimm);
struct acpi_nfit_desc *acpi_desc = nfit_mem->acpi_desc;
- struct {
+ /*
+ * This effectively creates a union between the flexible-array member
+ * and any members after _offset_to_fam.
+ */
+ union {
struct nd_cmd_pkg pkg;
- struct nd_intel_fw_activate_arm cmd;
+ struct {
+ u8 _offset_to_fam[offsetof(struct nd_cmd_pkg, nd_payload)];
+ struct nd_intel_fw_activate_arm cmd;
+ };
} nd_cmd = {
.pkg = {
.nd_command = NVDIMM_INTEL_FW_ACTIVATE_ARM,
--
2.43.0
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