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Date:   Tue, 17 Aug 2021 23:04:48 -0700
From:   Kees Cook <keescook@...omium.org>
To:     linux-kernel@...r.kernel.org
Cc:     Kees Cook <keescook@...omium.org>,
        Christian König <christian.koenig@....com>,
        "Pan, Xinhui" <Xinhui.Pan@....com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Hawking Zhang <Hawking.Zhang@....com>,
        Feifei Xu <Feifei.Xu@....com>, Lijo Lazar <lijo.lazar@....com>,
        Likun Gao <Likun.Gao@....com>, Jiawei Gu <Jiawei.Gu@....com>,
        Evan Quan <evan.quan@....com>, amd-gfx@...ts.freedesktop.org,
        dri-devel@...ts.freedesktop.org,
        Alex Deucher <alexander.deucher@....com>,
        "Gustavo A. R. Silva" <gustavoars@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        linux-staging@...ts.linux.dev, linux-block@...r.kernel.org,
        linux-kbuild@...r.kernel.org, clang-built-linux@...glegroups.com,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        linux-hardening@...r.kernel.org
Subject: [PATCH v2 18/63] drm/amd/pm: Use struct_group() for memcpy() region

In preparation for FORTIFY_SOURCE performing compile-time and run-time
field bounds checking for memcpy(), memmove(), and memset(), avoid
intentionally writing across neighboring fields.

Use struct_group() in structs:
	struct atom_smc_dpm_info_v4_5
	struct atom_smc_dpm_info_v4_6
	struct atom_smc_dpm_info_v4_7
	struct atom_smc_dpm_info_v4_10
	PPTable_t
so the grouped members can be referenced together. This will allow
memcpy() and sizeof() to more easily reason about sizes, improve
readability, and avoid future warnings about writing beyond the end of
the first member.

"pahole" shows no size nor member offset changes to any structs.
"objdump -d" shows no object code changes.

Cc: "Christian König" <christian.koenig@....com>
Cc: "Pan, Xinhui" <Xinhui.Pan@....com>
Cc: David Airlie <airlied@...ux.ie>
Cc: Daniel Vetter <daniel@...ll.ch>
Cc: Hawking Zhang <Hawking.Zhang@....com>
Cc: Feifei Xu <Feifei.Xu@....com>
Cc: Lijo Lazar <lijo.lazar@....com>
Cc: Likun Gao <Likun.Gao@....com>
Cc: Jiawei Gu <Jiawei.Gu@....com>
Cc: Evan Quan <evan.quan@....com>
Cc: amd-gfx@...ts.freedesktop.org
Cc: dri-devel@...ts.freedesktop.org
Signed-off-by: Kees Cook <keescook@...omium.org>
Acked-by: Alex Deucher <alexander.deucher@....com>
Link: https://lore.kernel.org/lkml/CADnq5_Npb8uYvd+R4UHgf-w8-cQj3JoODjviJR_Y9w9wqJ71mQ@mail.gmail.com
---
 drivers/gpu/drm/amd/include/atomfirmware.h           |  9 ++++++++-
 .../gpu/drm/amd/pm/inc/smu11_driver_if_arcturus.h    |  3 ++-
 drivers/gpu/drm/amd/pm/inc/smu11_driver_if_navi10.h  |  3 ++-
 .../gpu/drm/amd/pm/inc/smu13_driver_if_aldebaran.h   |  3 ++-
 drivers/gpu/drm/amd/pm/swsmu/smu11/arcturus_ppt.c    |  6 +++---
 drivers/gpu/drm/amd/pm/swsmu/smu11/navi10_ppt.c      | 12 ++++++++----
 drivers/gpu/drm/amd/pm/swsmu/smu13/aldebaran_ppt.c   |  6 +++---
 7 files changed, 28 insertions(+), 14 deletions(-)

diff --git a/drivers/gpu/drm/amd/include/atomfirmware.h b/drivers/gpu/drm/amd/include/atomfirmware.h
index 44955458fe38..7bf3edf15410 100644
--- a/drivers/gpu/drm/amd/include/atomfirmware.h
+++ b/drivers/gpu/drm/amd/include/atomfirmware.h
@@ -2081,6 +2081,7 @@ struct atom_smc_dpm_info_v4_5
 {
   struct   atom_common_table_header  table_header;
     // SECTION: BOARD PARAMETERS
+  struct_group(dpm_info,
     // I2C Control
   struct smudpm_i2c_controller_config_v2  I2cControllers[8];
 
@@ -2159,7 +2160,7 @@ struct atom_smc_dpm_info_v4_5
   uint32_t MvddRatio; // This is used for MVDD Vid workaround. It has 16 fractional bits (Q16.16)
   
   uint32_t     BoardReserved[9];
-
+  );
 };
 
 struct atom_smc_dpm_info_v4_6
@@ -2168,6 +2169,7 @@ struct atom_smc_dpm_info_v4_6
   // section: board parameters
   uint32_t     i2c_padding[3];   // old i2c control are moved to new area
 
+  struct_group(dpm_info,
   uint16_t     maxvoltagestepgfx; // in mv(q2) max voltage step that smu will request. multiple steps are taken if voltage change exceeds this value.
   uint16_t     maxvoltagestepsoc; // in mv(q2) max voltage step that smu will request. multiple steps are taken if voltage change exceeds this value.
 
@@ -2246,12 +2248,14 @@ struct atom_smc_dpm_info_v4_6
 
   // reserved
   uint32_t   boardreserved[10];
+  );
 };
 
 struct atom_smc_dpm_info_v4_7
 {
   struct   atom_common_table_header  table_header;
     // SECTION: BOARD PARAMETERS
+  struct_group(dpm_info,
     // I2C Control
   struct smudpm_i2c_controller_config_v2  I2cControllers[8];
 
@@ -2348,6 +2352,7 @@ struct atom_smc_dpm_info_v4_7
   uint8_t      Padding8_Psi2;
 
   uint32_t     BoardReserved[5];
+  );
 };
 
 struct smudpm_i2c_controller_config_v3
@@ -2478,6 +2483,7 @@ struct atom_smc_dpm_info_v4_10
   struct   atom_common_table_header  table_header;
 
   // SECTION: BOARD PARAMETERS
+  struct_group(dpm_info,
   // Telemetry Settings
   uint16_t GfxMaxCurrent; // in Amps
   uint8_t   GfxOffset;     // in Amps
@@ -2524,6 +2530,7 @@ struct atom_smc_dpm_info_v4_10
   uint16_t spare5;
 
   uint32_t reserved[16];
+  );
 };
 
 /* 
diff --git a/drivers/gpu/drm/amd/pm/inc/smu11_driver_if_arcturus.h b/drivers/gpu/drm/amd/pm/inc/smu11_driver_if_arcturus.h
index 43d43d6addc0..8093a98800c3 100644
--- a/drivers/gpu/drm/amd/pm/inc/smu11_driver_if_arcturus.h
+++ b/drivers/gpu/drm/amd/pm/inc/smu11_driver_if_arcturus.h
@@ -643,6 +643,7 @@ typedef struct {
   // SECTION: BOARD PARAMETERS
 
   // SVI2 Board Parameters
+  struct_group(v4_6,
   uint16_t     MaxVoltageStepGfx; // In mV(Q2) Max voltage step that SMU will request. Multiple steps are taken if voltage change exceeds this value.
   uint16_t     MaxVoltageStepSoc; // In mV(Q2) Max voltage step that SMU will request. Multiple steps are taken if voltage change exceeds this value.
 
@@ -728,10 +729,10 @@ typedef struct {
   uint32_t     BoardVoltageCoeffB;    // decode by /1000
 
   uint32_t     BoardReserved[7];
+  );
 
   // Padding for MMHUB - do not modify this
   uint32_t     MmHubPadding[8]; // SMU internal use
-
 } PPTable_t;
 
 typedef struct {
diff --git a/drivers/gpu/drm/amd/pm/inc/smu11_driver_if_navi10.h b/drivers/gpu/drm/amd/pm/inc/smu11_driver_if_navi10.h
index 04752ade1016..0b4e6e907e95 100644
--- a/drivers/gpu/drm/amd/pm/inc/smu11_driver_if_navi10.h
+++ b/drivers/gpu/drm/amd/pm/inc/smu11_driver_if_navi10.h
@@ -725,6 +725,7 @@ typedef struct {
   uint32_t     Reserved[8];
 
   // SECTION: BOARD PARAMETERS
+  struct_group(v4,
   // I2C Control
   I2cControllerConfig_t  I2cControllers[NUM_I2C_CONTROLLERS];     
 
@@ -809,10 +810,10 @@ typedef struct {
   uint8_t      Padding8_Loadline;
 
   uint32_t     BoardReserved[8];
+  );
 
   // Padding for MMHUB - do not modify this
   uint32_t     MmHubPadding[8]; // SMU internal use
-
 } PPTable_t;
 
 typedef struct {
diff --git a/drivers/gpu/drm/amd/pm/inc/smu13_driver_if_aldebaran.h b/drivers/gpu/drm/amd/pm/inc/smu13_driver_if_aldebaran.h
index a017983ff1fa..5056d3728da8 100644
--- a/drivers/gpu/drm/amd/pm/inc/smu13_driver_if_aldebaran.h
+++ b/drivers/gpu/drm/amd/pm/inc/smu13_driver_if_aldebaran.h
@@ -390,6 +390,7 @@ typedef struct {
   uint32_t spare3[14];
 
   // SECTION: BOARD PARAMETERS
+  struct_group(v4_10,
   // Telemetry Settings
   uint16_t GfxMaxCurrent; // in Amps
   int8_t   GfxOffset;     // in Amps
@@ -444,7 +445,7 @@ typedef struct {
 
   //reserved
   uint32_t reserved[14];
-
+  );
 } PPTable_t;
 
 typedef struct {
diff --git a/drivers/gpu/drm/amd/pm/swsmu/smu11/arcturus_ppt.c b/drivers/gpu/drm/amd/pm/swsmu/smu11/arcturus_ppt.c
index 8ab58781ae13..341adf209240 100644
--- a/drivers/gpu/drm/amd/pm/swsmu/smu11/arcturus_ppt.c
+++ b/drivers/gpu/drm/amd/pm/swsmu/smu11/arcturus_ppt.c
@@ -463,11 +463,11 @@ static int arcturus_append_powerplay_table(struct smu_context *smu)
 			smc_dpm_table->table_header.format_revision,
 			smc_dpm_table->table_header.content_revision);
 
+	BUILD_BUG_ON(sizeof(smc_pptable->v4_6) != sizeof(smc_dpm_table->dpm_info));
 	if ((smc_dpm_table->table_header.format_revision == 4) &&
 	    (smc_dpm_table->table_header.content_revision == 6))
-		memcpy(&smc_pptable->MaxVoltageStepGfx,
-		       &smc_dpm_table->maxvoltagestepgfx,
-		       sizeof(*smc_dpm_table) - offsetof(struct atom_smc_dpm_info_v4_6, maxvoltagestepgfx));
+		memcpy(&smc_pptable->v4_6, &smc_dpm_table->dpm_info,
+		       sizeof(smc_dpm_table->dpm_info));
 
 	return 0;
 }
diff --git a/drivers/gpu/drm/amd/pm/swsmu/smu11/navi10_ppt.c b/drivers/gpu/drm/amd/pm/swsmu/smu11/navi10_ppt.c
index 2e5d3669652b..e8b6e25a7815 100644
--- a/drivers/gpu/drm/amd/pm/swsmu/smu11/navi10_ppt.c
+++ b/drivers/gpu/drm/amd/pm/swsmu/smu11/navi10_ppt.c
@@ -431,16 +431,20 @@ static int navi10_append_powerplay_table(struct smu_context *smu)
 
 	switch (smc_dpm_table->table_header.content_revision) {
 	case 5: /* nv10 and nv14 */
-		memcpy(smc_pptable->I2cControllers, smc_dpm_table->I2cControllers,
-			sizeof(*smc_dpm_table) - sizeof(smc_dpm_table->table_header));
+		BUILD_BUG_ON(sizeof(smc_pptable->v4) !=
+			     sizeof(smc_dpm_table->dpm_info));
+		memcpy(&smc_pptable->v4, &smc_dpm_table->dpm_info,
+		       sizeof(smc_dpm_table->dpm_info));
 		break;
 	case 7: /* nv12 */
 		ret = amdgpu_atombios_get_data_table(adev, index, NULL, NULL, NULL,
 					      (uint8_t **)&smc_dpm_table_v4_7);
 		if (ret)
 			return ret;
-		memcpy(smc_pptable->I2cControllers, smc_dpm_table_v4_7->I2cControllers,
-			sizeof(*smc_dpm_table_v4_7) - sizeof(smc_dpm_table_v4_7->table_header));
+		BUILD_BUG_ON(sizeof(smc_pptable->v4) !=
+			     sizeof(smc_dpm_table_v4_7->dpm_info));
+		memcpy(&smc_pptable->v4, &smc_dpm_table_v4_7->dpm_info,
+		       sizeof(smc_dpm_table_v4_7->dpm_info));
 		break;
 	default:
 		dev_err(smu->adev->dev, "smc_dpm_info with unsupported content revision %d!\n",
diff --git a/drivers/gpu/drm/amd/pm/swsmu/smu13/aldebaran_ppt.c b/drivers/gpu/drm/amd/pm/swsmu/smu13/aldebaran_ppt.c
index c8eefacfdd37..492ba37bc514 100644
--- a/drivers/gpu/drm/amd/pm/swsmu/smu13/aldebaran_ppt.c
+++ b/drivers/gpu/drm/amd/pm/swsmu/smu13/aldebaran_ppt.c
@@ -407,11 +407,11 @@ static int aldebaran_append_powerplay_table(struct smu_context *smu)
 			smc_dpm_table->table_header.format_revision,
 			smc_dpm_table->table_header.content_revision);
 
+	BUILD_BUG_ON(sizeof(smc_pptable->v4_10) != sizeof(smc_dpm_table->dpm_info));
 	if ((smc_dpm_table->table_header.format_revision == 4) &&
 	    (smc_dpm_table->table_header.content_revision == 10))
-		memcpy(&smc_pptable->GfxMaxCurrent,
-		       &smc_dpm_table->GfxMaxCurrent,
-		       sizeof(*smc_dpm_table) - offsetof(struct atom_smc_dpm_info_v4_10, GfxMaxCurrent));
+		memcpy(&smc_pptable->v4_10, &smc_dpm_table->dpm_info,
+		       sizeof(smc_dpm_table->dpm_info));
 	return 0;
 }
 
-- 
2.30.2

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