The data portion of IFS test image file contains a metadata
region containing possibly multiple metadata structures in
addition to test data and hashes.
IFS Metadata layout
+----------------------+ 0
|META_TYPE_IFS (=1) |
+----------------------+
|meta_size |
+----------------------+
|test type |
+----------------------+
|fusa info |
+----------------------+
|total images |
+----------------------+
|current image# |
+----------------------+
|total chunks |
+----------------------+
|starting chunk |
+----------------------+
|size per chunk |
+----------------------+
|chunks per stride |
+----------------------+
|Reserved[54] |
+----------------------+ 256
| |
| |
| |
| |
|Test Data/Chunks |
| |
| |
| |
| |
+----------------------+ meta_size
| META_TYPE_END (=0) |
+----------------------+ meta_size + 4
| size of end (=8) |
| |
+----------------------+ meta_size + 8
Introduce the layout of this meta_data structure and validate
the sanity of certain fields of the new image before loading.
Tweak references to IFS test image chunks to reflect the updated
layout of the test image.
Reviewed-by: Tony Luck <[email protected]>
Reviewed-by: Sohil Mehta <[email protected]>
Reviewed-by: Hans de Goede <[email protected]>
Signed-off-by: Jithu Joseph <[email protected]>
---
drivers/platform/x86/intel/ifs/ifs.h | 2 +
drivers/platform/x86/intel/ifs/load.c | 57 +++++++++++++++++++++++++++
2 files changed, 59 insertions(+)
diff --git a/drivers/platform/x86/intel/ifs/ifs.h b/drivers/platform/x86/intel/ifs/ifs.h
index 3a051890d9e7..e3e8210ebd57 100644
--- a/drivers/platform/x86/intel/ifs/ifs.h
+++ b/drivers/platform/x86/intel/ifs/ifs.h
@@ -196,6 +196,7 @@ union ifs_status {
* @valid_chunks: number of chunks which could be validated.
* @status: it holds simple status pass/fail/untested
* @scan_details: opaque scan status code from h/w
+ * @cur_batch: number indicating the currently loaded test file
*/
struct ifs_data {
int integrity_cap_bit;
@@ -205,6 +206,7 @@ struct ifs_data {
int valid_chunks;
int status;
u64 scan_details;
+ u32 cur_batch;
};
struct ifs_work {
diff --git a/drivers/platform/x86/intel/ifs/load.c b/drivers/platform/x86/intel/ifs/load.c
index 6caa98cc6cac..3f1de9d4cf4b 100644
--- a/drivers/platform/x86/intel/ifs/load.c
+++ b/drivers/platform/x86/intel/ifs/load.c
@@ -7,7 +7,25 @@
#include "ifs.h"
+#define IFS_CHUNK_ALIGNMENT 256
+union meta_data {
+ struct {
+ u32 meta_type; // metadata type
+ u32 meta_size; // size of this entire struct including hdrs.
+ u32 test_type; // IFS test type
+ u32 fusa_info; // Fusa info
+ u32 total_images; // Total number of images
+ u32 current_image; // Current Image #
+ u32 total_chunks; // Total number of chunks in this image
+ u32 starting_chunk; // Starting chunk number in this image
+ u32 size_per_chunk; // size of each chunk
+ u32 chunks_per_stride; // number of chunks in a stride
+ };
+ u8 padding[IFS_CHUNK_ALIGNMENT];
+};
+
#define IFS_HEADER_SIZE (sizeof(struct microcode_header_intel))
+#define META_TYPE_IFS 1
static struct microcode_header_intel *ifs_header_ptr; /* pointer to the ifs image header */
static u64 ifs_hash_ptr; /* Address of ifs metadata (hash) */
static u64 ifs_test_image_ptr; /* 256B aligned address of test pattern */
@@ -128,6 +146,41 @@ static void copy_hashes_authenticate_chunks(struct work_struct *work)
complete(&ifs_done);
}
+static int validate_ifs_metadata(struct device *dev)
+{
+ struct ifs_data *ifsd = ifs_get_data(dev);
+ union meta_data *ifs_meta;
+ char test_file[64];
+ int ret = -EINVAL;
+
+ snprintf(test_file, sizeof(test_file), "%02x-%02x-%02x-%02x.scan",
+ boot_cpu_data.x86, boot_cpu_data.x86_model,
+ boot_cpu_data.x86_stepping, ifsd->cur_batch);
+
+ ifs_meta = (union meta_data *)find_meta_data(ifs_header_ptr, META_TYPE_IFS);
+ if (!ifs_meta) {
+ dev_err(dev, "IFS Metadata missing in file %s\n", test_file);
+ return ret;
+ }
+
+ ifs_test_image_ptr = (u64)ifs_meta + sizeof(union meta_data);
+
+ /* Scan chunk start must be 256 byte aligned */
+ if (!IS_ALIGNED(ifs_test_image_ptr, IFS_CHUNK_ALIGNMENT)) {
+ dev_err(dev, "Scan pattern is not aligned on %d bytes aligned in %s\n",
+ IFS_CHUNK_ALIGNMENT, test_file);
+ return ret;
+ }
+
+ if (ifs_meta->current_image != ifsd->cur_batch) {
+ dev_warn(dev, "Mismatch between filename %s and batch metadata 0x%02x\n",
+ test_file, ifs_meta->current_image);
+ return ret;
+ }
+
+ return 0;
+}
+
/*
* IFS requires scan chunks authenticated per each socket in the platform.
* Once the test chunk is authenticated, it is automatically copied to secured memory
@@ -140,6 +193,10 @@ static int scan_chunks_sanity_check(struct device *dev)
int curr_pkg, cpu, ret;
memset(ifs_pkg_auth, 0, (topology_max_packages() * sizeof(bool)));
+ ret = validate_ifs_metadata(dev);
+ if (ret)
+ return ret;
+
ifsd->loading_error = false;
ifsd->loaded_version = ifs_header_ptr->rev;
--
2.25.1
The data portion of IFS test image file contains a metadata
region containing possibly multiple metadata structures in
addition to test data and hashes.
IFS Metadata layout
+----------------------+ 0
|META_TYPE_IFS (=1) |
+----------------------+
|meta_size |
+----------------------+
|test type |
+----------------------+
|fusa info |
+----------------------+
|total images |
+----------------------+
|current image# |
+----------------------+
|total chunks |
+----------------------+
|starting chunk |
+----------------------+
|size per chunk |
+----------------------+
|chunks per stride |
+----------------------+
|Reserved[54] |
+----------------------+ 256
| |
| |
| |
| |
|Test Data/Chunks |
| |
| |
| |
| |
+----------------------+ meta_size
| META_TYPE_END (=0) |
+----------------------+ meta_size + 4
| size of end (=8) |
| |
+----------------------+ meta_size + 8
Introduce the layout of this meta_data structure and validate
the sanity of certain fields of the new image before loading.
Tweak references to IFS test image chunks to reflect the updated
layout of the test image.
Reviewed-by: Tony Luck <[email protected]>
Reviewed-by: Sohil Mehta <[email protected]>
Reviewed-by: Hans de Goede <[email protected]>
Signed-off-by: Jithu Joseph <[email protected]>
---
- Rebased to apply alongside the updated 4/16 patch
drivers/platform/x86/intel/ifs/ifs.h | 2 +
drivers/platform/x86/intel/ifs/load.c | 58 ++++++++++++++++++++++++++-
2 files changed, 59 insertions(+), 1 deletion(-)
diff --git a/drivers/platform/x86/intel/ifs/ifs.h b/drivers/platform/x86/intel/ifs/ifs.h
index 8de1952a1b7b..74c051c544f4 100644
--- a/drivers/platform/x86/intel/ifs/ifs.h
+++ b/drivers/platform/x86/intel/ifs/ifs.h
@@ -197,6 +197,7 @@ union ifs_status {
* @valid_chunks: number of chunks which could be validated.
* @status: it holds simple status pass/fail/untested
* @scan_details: opaque scan status code from h/w
+ * @cur_batch: number indicating the currently loaded test file
*/
struct ifs_data {
int integrity_cap_bit;
@@ -207,6 +208,7 @@ struct ifs_data {
int valid_chunks;
int status;
u64 scan_details;
+ u32 cur_batch;
};
struct ifs_work {
diff --git a/drivers/platform/x86/intel/ifs/load.c b/drivers/platform/x86/intel/ifs/load.c
index 83434160bc4c..edc7baa976bf 100644
--- a/drivers/platform/x86/intel/ifs/load.c
+++ b/drivers/platform/x86/intel/ifs/load.c
@@ -7,7 +7,25 @@
#include "ifs.h"
+#define IFS_CHUNK_ALIGNMENT 256
+union meta_data {
+ struct {
+ u32 meta_type; // metadata type
+ u32 meta_size; // size of this entire struct including hdrs.
+ u32 test_type; // IFS test type
+ u32 fusa_info; // Fusa info
+ u32 total_images; // Total number of images
+ u32 current_image; // Current Image #
+ u32 total_chunks; // Total number of chunks in this image
+ u32 starting_chunk; // Starting chunk number in this image
+ u32 size_per_chunk; // size of each chunk
+ u32 chunks_per_stride; // number of chunks in a stride
+ };
+ u8 padding[IFS_CHUNK_ALIGNMENT];
+};
+
#define IFS_HEADER_SIZE (sizeof(struct microcode_header_intel))
+#define META_TYPE_IFS 1
static struct microcode_header_intel *ifs_header_ptr; /* pointer to the ifs image header */
static u64 ifs_hash_ptr; /* Address of ifs metadata (hash) */
static u64 ifs_test_image_ptr; /* 256B aligned address of test pattern */
@@ -128,6 +146,41 @@ static void copy_hashes_authenticate_chunks(struct work_struct *work)
complete(&ifs_done);
}
+static int validate_ifs_metadata(struct device *dev)
+{
+ struct ifs_data *ifsd = ifs_get_data(dev);
+ union meta_data *ifs_meta;
+ char test_file[64];
+ int ret = -EINVAL;
+
+ snprintf(test_file, sizeof(test_file), "%02x-%02x-%02x-%02x.scan",
+ boot_cpu_data.x86, boot_cpu_data.x86_model,
+ boot_cpu_data.x86_stepping, ifsd->cur_batch);
+
+ ifs_meta = (union meta_data *)find_meta_data(ifs_header_ptr, META_TYPE_IFS);
+ if (!ifs_meta) {
+ dev_err(dev, "IFS Metadata missing in file %s\n", test_file);
+ return ret;
+ }
+
+ ifs_test_image_ptr = (u64)ifs_meta + sizeof(union meta_data);
+
+ /* Scan chunk start must be 256 byte aligned */
+ if (!IS_ALIGNED(ifs_test_image_ptr, IFS_CHUNK_ALIGNMENT)) {
+ dev_err(dev, "Scan pattern is not aligned on %d bytes aligned in %s\n",
+ IFS_CHUNK_ALIGNMENT, test_file);
+ return ret;
+ }
+
+ if (ifs_meta->current_image != ifsd->cur_batch) {
+ dev_warn(dev, "Mismatch between filename %s and batch metadata 0x%02x\n",
+ test_file, ifs_meta->current_image);
+ return ret;
+ }
+
+ return 0;
+}
+
/*
* IFS requires scan chunks authenticated per each socket in the platform.
* Once the test chunk is authenticated, it is automatically copied to secured memory
@@ -139,8 +192,11 @@ static int scan_chunks_sanity_check(struct device *dev)
struct ifs_work local_work;
int curr_pkg, cpu, ret;
-
memset(ifsd->pkg_auth, 0, (topology_max_packages() * sizeof(bool)));
+ ret = validate_ifs_metadata(dev);
+ if (ret)
+ return ret;
+
ifsd->loading_error = false;
ifsd->loaded_version = ifs_header_ptr->rev;
--
2.25.1
The following commit has been merged into the x86/microcode branch of tip:
Commit-ID: 48c6e7dc19051c5ef725490cf8673d768cda7748
Gitweb: https://git.kernel.org/tip/48c6e7dc19051c5ef725490cf8673d768cda7748
Author: Jithu Joseph <[email protected]>
AuthorDate: Thu, 17 Nov 2022 15:04:08 -08:00
Committer: Borislav Petkov <[email protected]>
CommitterDate: Sat, 19 Nov 2022 11:22:29 +01:00
platform/x86/intel/ifs: Add metadata validation
The data portion of a IFS test image file contains a metadata region
containing possibly multiple metadata structures in addition to test
data and hashes.
IFS Metadata layout
+----------------------+ 0
|META_TYPE_IFS (=1) |
+----------------------+
|meta_size |
+----------------------+
|test type |
+----------------------+
|fusa info |
+----------------------+
|total images |
+----------------------+
|current image# |
+----------------------+
|total chunks |
+----------------------+
|starting chunk |
+----------------------+
|size per chunk |
+----------------------+
|chunks per stride |
+----------------------+
|Reserved[54] |
+----------------------+ 256
| |
| Test Data/Chunks |
| |
+----------------------+ meta_size
| META_TYPE_END (=0) |
+----------------------+ meta_size + 4
| size of end (=8) |
+----------------------+ meta_size + 8
Introduce the layout of this meta_data structure and validate
the sanity of certain fields of the new image before loading.
Tweak references to IFS test image chunks to reflect the updated
layout of the test image.
[ bp: Massage commit message. ]
Signed-off-by: Jithu Joseph <[email protected]>
Signed-off-by: Borislav Petkov <[email protected]>
Reviewed-by: Tony Luck <[email protected]>
Reviewed-by: Sohil Mehta <[email protected]>
Reviewed-by: Hans de Goede <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
---
drivers/platform/x86/intel/ifs/ifs.h | 2 +-
drivers/platform/x86/intel/ifs/load.c | 58 +++++++++++++++++++++++++-
2 files changed, 59 insertions(+), 1 deletion(-)
diff --git a/drivers/platform/x86/intel/ifs/ifs.h b/drivers/platform/x86/intel/ifs/ifs.h
index 8de1952..74c051c 100644
--- a/drivers/platform/x86/intel/ifs/ifs.h
+++ b/drivers/platform/x86/intel/ifs/ifs.h
@@ -197,6 +197,7 @@ union ifs_status {
* @valid_chunks: number of chunks which could be validated.
* @status: it holds simple status pass/fail/untested
* @scan_details: opaque scan status code from h/w
+ * @cur_batch: number indicating the currently loaded test file
*/
struct ifs_data {
int integrity_cap_bit;
@@ -207,6 +208,7 @@ struct ifs_data {
int valid_chunks;
int status;
u64 scan_details;
+ u32 cur_batch;
};
struct ifs_work {
diff --git a/drivers/platform/x86/intel/ifs/load.c b/drivers/platform/x86/intel/ifs/load.c
index 8343416..edc7baa 100644
--- a/drivers/platform/x86/intel/ifs/load.c
+++ b/drivers/platform/x86/intel/ifs/load.c
@@ -7,7 +7,25 @@
#include "ifs.h"
+#define IFS_CHUNK_ALIGNMENT 256
+union meta_data {
+ struct {
+ u32 meta_type; // metadata type
+ u32 meta_size; // size of this entire struct including hdrs.
+ u32 test_type; // IFS test type
+ u32 fusa_info; // Fusa info
+ u32 total_images; // Total number of images
+ u32 current_image; // Current Image #
+ u32 total_chunks; // Total number of chunks in this image
+ u32 starting_chunk; // Starting chunk number in this image
+ u32 size_per_chunk; // size of each chunk
+ u32 chunks_per_stride; // number of chunks in a stride
+ };
+ u8 padding[IFS_CHUNK_ALIGNMENT];
+};
+
#define IFS_HEADER_SIZE (sizeof(struct microcode_header_intel))
+#define META_TYPE_IFS 1
static struct microcode_header_intel *ifs_header_ptr; /* pointer to the ifs image header */
static u64 ifs_hash_ptr; /* Address of ifs metadata (hash) */
static u64 ifs_test_image_ptr; /* 256B aligned address of test pattern */
@@ -128,6 +146,41 @@ done:
complete(&ifs_done);
}
+static int validate_ifs_metadata(struct device *dev)
+{
+ struct ifs_data *ifsd = ifs_get_data(dev);
+ union meta_data *ifs_meta;
+ char test_file[64];
+ int ret = -EINVAL;
+
+ snprintf(test_file, sizeof(test_file), "%02x-%02x-%02x-%02x.scan",
+ boot_cpu_data.x86, boot_cpu_data.x86_model,
+ boot_cpu_data.x86_stepping, ifsd->cur_batch);
+
+ ifs_meta = (union meta_data *)find_meta_data(ifs_header_ptr, META_TYPE_IFS);
+ if (!ifs_meta) {
+ dev_err(dev, "IFS Metadata missing in file %s\n", test_file);
+ return ret;
+ }
+
+ ifs_test_image_ptr = (u64)ifs_meta + sizeof(union meta_data);
+
+ /* Scan chunk start must be 256 byte aligned */
+ if (!IS_ALIGNED(ifs_test_image_ptr, IFS_CHUNK_ALIGNMENT)) {
+ dev_err(dev, "Scan pattern is not aligned on %d bytes aligned in %s\n",
+ IFS_CHUNK_ALIGNMENT, test_file);
+ return ret;
+ }
+
+ if (ifs_meta->current_image != ifsd->cur_batch) {
+ dev_warn(dev, "Mismatch between filename %s and batch metadata 0x%02x\n",
+ test_file, ifs_meta->current_image);
+ return ret;
+ }
+
+ return 0;
+}
+
/*
* IFS requires scan chunks authenticated per each socket in the platform.
* Once the test chunk is authenticated, it is automatically copied to secured memory
@@ -139,8 +192,11 @@ static int scan_chunks_sanity_check(struct device *dev)
struct ifs_work local_work;
int curr_pkg, cpu, ret;
-
memset(ifsd->pkg_auth, 0, (topology_max_packages() * sizeof(bool)));
+ ret = validate_ifs_metadata(dev);
+ if (ret)
+ return ret;
+
ifsd->loading_error = false;
ifsd->loaded_version = ifs_header_ptr->rev;