Hi Jan,

On Tue, 6 Jun 2023 at 12:09, Jan Kiszka jan.kiszka@siemens.com wrote:

On 26.05.23 03:07, Masahisa Kojima wrote:

...

When the flash is not owned by the non-secure world, accessing the EFI variables is straightforward and done via EFI Runtime Variable Services. In this case, critical variables for system integrity and security are normally stored in the dedicated secure storage and only accessible from the secure world.

On the other hand, the small embedded devices don't have the special dedicated secure storage. The eMMC device with an RPMB partition is becoming more common, we can use an RPMB partition to store the EFI Variables.

The eMMC device is typically owned by the non-secure world(linux in this case). There is an existing solution utilizing eMMC RPMB partition for EFI Variables, it is implemented by interacting with TEE(OP-TEE in this case), StandaloneMM(as EFI Variable Service Pseudo TA), eMMC driver and tee-supplicant. The last piece is the tee-based variable access driver to interact with TEE and StandaloneMM.

So let's add the kernel functions needed.

This feature is implemented as a kernel module. StMM PTA has TA_FLAG_DEVICE_ENUM_SUPP flag when registered to OP-TEE so that this tee_stmm_efi module is probed after tee-supplicant starts, since "SetVariable" EFI Runtime Variable Service requires to interact with tee-supplicant.

Acked-by: Sumit Garg sumit.garg@linaro.org Co-developed-by: Ilias Apalodimas ilias.apalodimas@linaro.org Signed-off-by: Ilias Apalodimas ilias.apalodimas@linaro.org Signed-off-by: Masahisa Kojima masahisa.kojima@linaro.org

---

drivers/firmware/efi/Kconfig | 15 + drivers/firmware/efi/Makefile | 1 + drivers/firmware/efi/stmm/mm_communication.h | 236 +++++++ drivers/firmware/efi/stmm/tee_stmm_efi.c | 638 +++++++++++++++++++ 4 files changed, 890 insertions(+) create mode 100644 drivers/firmware/efi/stmm/mm_communication.h create mode 100644 drivers/firmware/efi/stmm/tee_stmm_efi.c

diff --git a/drivers/firmware/efi/Kconfig b/drivers/firmware/efi/Kconfig index 043ca31c114e..aa38089d1e4a 100644 --- a/drivers/firmware/efi/Kconfig +++ b/drivers/firmware/efi/Kconfig @@ -287,3 +287,18 @@ config UEFI_CPER_X86 bool depends on UEFI_CPER && X86 default y

+config TEE_STMM_EFI

• tristate "TEE based EFI runtime variable service driver"
  

• depends on EFI && OPTEE && !EFI_VARS_PSTORE
  

• help
  

•   Select this config option if TEE is compiled to include StandAloneMM
  

•   as a separate secure partition it has the ability to check and store
  

•   EFI variables on an RPMB or any other non-volatile medium used by
  

•   StandAloneMM.
  

•   Enabling this will change the EFI runtime services from the firmware
  

•   provided functions to TEE calls.
  

•   To compile this driver as a module, choose M here: the module
  

•   will be called tee_stmm_efi.
  

diff --git a/drivers/firmware/efi/Makefile b/drivers/firmware/efi/Makefile index b51f2a4c821e..2ca8ee6ab490 100644 --- a/drivers/firmware/efi/Makefile +++ b/drivers/firmware/efi/Makefile @@ -41,3 +41,4 @@ obj-$(CONFIG_EFI_CAPSULE_LOADER) += capsule-loader.o obj-$(CONFIG_EFI_EARLYCON) += earlycon.o obj-$(CONFIG_UEFI_CPER_ARM) += cper-arm.o obj-$(CONFIG_UEFI_CPER_X86) += cper-x86.o +obj-$(CONFIG_TEE_STMM_EFI) += stmm/tee_stmm_efi.o diff --git a/drivers/firmware/efi/stmm/mm_communication.h b/drivers/firmware/efi/stmm/mm_communication.h new file mode 100644 index 000000000000..52a1f32cd1eb --- /dev/null +++ b/drivers/firmware/efi/stmm/mm_communication.h @@ -0,0 +1,236 @@ +/* SPDX-License-Identifier: GPL-2.0+ */ +/*

• • Headers for EFI variable service via StandAloneMM, EDK2 application running
• • in OP-TEE. Most of the structs and defines resemble the EDK2 naming.
• • Copyright (c) 2017, Intel Corporation. All rights reserved.
• • Copyright (C) 2020 Linaro Ltd.
• */

+#ifndef _MM_COMMUNICATION_H_ +#define _MM_COMMUNICATION_H_

+/*

• • Interface to the pseudo Trusted Application (TA), which provides a
• • communication channel with the Standalone MM (Management Mode)
• • Secure Partition running at Secure-EL0
• */

+#define PTA_STMM_CMD_COMMUNICATE 0

+/*

• • Defined in OP-TEE, this UUID is used to identify the pseudo-TA.
• • OP-TEE is using big endian GUIDs while UEFI uses little endian ones
• */

+#define PTA_STMM_UUID \

• UUID_INIT(0xed32d533, 0x99e6, 0x4209, \
  

•           0x9c, 0xc0, 0x2d, 0x72, 0xcd, 0xd9, 0x98, 0xa7)
  

+#define EFI_MM_VARIABLE_GUID \

• EFI_GUID(0xed32d533, 0x99e6, 0x4209, \
  

•          0x9c, 0xc0, 0x2d, 0x72, 0xcd, 0xd9, 0x98, 0xa7)
  

+/**

• • struct efi_mm_communicate_header - Header used for SMM variable communication
• • @header_guid: header use for disambiguation of content
• • @message_len: length of the message. Does not include the size of the

• •            header
    

• • @data: payload of the message
• • Defined in the PI spec as EFI_MM_COMMUNICATE_HEADER.
• • To avoid confusion in interpreting frames, the communication buffer should
• • always begin with efi_mm_communicate_header.
• */

+struct efi_mm_communicate_header {

• efi_guid_t header_guid;
  

• size_t     message_len;
  

• u8         data[];
  

+} __packed;

+#define MM_COMMUNICATE_HEADER_SIZE \

• (sizeof(struct efi_mm_communicate_header))
  

+/* SPM return error codes */ +#define ARM_SVC_SPM_RET_SUCCESS 0 +#define ARM_SVC_SPM_RET_NOT_SUPPORTED -1 +#define ARM_SVC_SPM_RET_INVALID_PARAMS -2 +#define ARM_SVC_SPM_RET_DENIED -3 +#define ARM_SVC_SPM_RET_NO_MEMORY -5

+#define SMM_VARIABLE_FUNCTION_GET_VARIABLE 1 +/*

• • The payload for this function is
• • SMM_VARIABLE_COMMUNICATE_GET_NEXT_VARIABLE_NAME.
• */

+#define SMM_VARIABLE_FUNCTION_GET_NEXT_VARIABLE_NAME 2 +/*

• • The payload for this function is SMM_VARIABLE_COMMUNICATE_ACCESS_VARIABLE.
• */

+#define SMM_VARIABLE_FUNCTION_SET_VARIABLE 3 +/*

• • The payload for this function is
• • SMM_VARIABLE_COMMUNICATE_QUERY_VARIABLE_INFO.
• */

+#define SMM_VARIABLE_FUNCTION_QUERY_VARIABLE_INFO 4 +/*

• • It is a notify event, no extra payload for this function.
• */

+#define SMM_VARIABLE_FUNCTION_READY_TO_BOOT 5 +/*

• • It is a notify event, no extra payload for this function.
• */

+#define SMM_VARIABLE_FUNCTION_EXIT_BOOT_SERVICE 6 +/*

• • The payload for this function is VARIABLE_INFO_ENTRY.
• • The GUID in EFI_SMM_COMMUNICATE_HEADER is gEfiSmmVariableProtocolGuid.
• */

+#define SMM_VARIABLE_FUNCTION_GET_STATISTICS 7 +/*

• • The payload for this function is SMM_VARIABLE_COMMUNICATE_LOCK_VARIABLE
• */

+#define SMM_VARIABLE_FUNCTION_LOCK_VARIABLE 8

+#define SMM_VARIABLE_FUNCTION_VAR_CHECK_VARIABLE_PROPERTY_SET 9

+#define SMM_VARIABLE_FUNCTION_VAR_CHECK_VARIABLE_PROPERTY_GET 10

+#define SMM_VARIABLE_FUNCTION_GET_PAYLOAD_SIZE 11 +/*

• • The payload for this function is
• • SMM_VARIABLE_COMMUNICATE_RUNTIME_VARIABLE_CACHE_CONTEXT
• */

+#define SMM_VARIABLE_FUNCTION_INIT_RUNTIME_VARIABLE_CACHE_CONTEXT 12

+#define SMM_VARIABLE_FUNCTION_SYNC_RUNTIME_CACHE 13 +/*

• • The payload for this function is
• • SMM_VARIABLE_COMMUNICATE_GET_RUNTIME_CACHE_INFO
• */

+#define SMM_VARIABLE_FUNCTION_GET_RUNTIME_CACHE_INFO 14

+/**

• • struct smm_variable_communicate_header - Used for SMM variable communication
• • @function: function to call in Smm.
• • @ret_status: return status
• • @data: payload
• */

+struct smm_variable_communicate_header {

• size_t  function;
  

• efi_status_t ret_status;
  

• u8 data[];
  

+};

+#define MM_VARIABLE_COMMUNICATE_SIZE \

• (sizeof(struct smm_variable_communicate_header))
  

+/**

• • struct smm_variable_access - Used to communicate with StMM by

• •                          SetVariable and GetVariable.
    

• • @guid: vendor GUID
• • @data_size: size of EFI variable data
• • @name_size: size of EFI name
• • @attr: attributes
• • @name: variable name
• */

+struct smm_variable_access {

• efi_guid_t  guid;
  

• size_t data_size;
  

• size_t name_size;
  

• u32 attr;
  

• u16 name[];
  

+};

+#define MM_VARIABLE_ACCESS_HEADER_SIZE \

• (sizeof(struct smm_variable_access))
  

+/**

• • struct smm_variable_payload_size - Used to get the max allowed

• •                                payload used in StMM.
    

• • @size: size to fill in
• */

+struct smm_variable_payload_size {

• size_t size;
  

+};

+/**

• • struct smm_variable_getnext - Used to communicate with StMM for

• •                           GetNextVariableName.
    

• • @guid: vendor GUID
• • @name_size: size of the name of the variable
• • @name: variable name
• */

+struct smm_variable_getnext {

• efi_guid_t  guid;
  

• size_t name_size;
  

• u16         name[];
  

+};

+#define MM_VARIABLE_GET_NEXT_HEADER_SIZE \

• (sizeof(struct smm_variable_getnext))
  

+/**

• • struct smm_variable_query_info - Used to communicate with StMM for

• •                              QueryVariableInfo.
    

• • @max_variable_storage: max available storage
• • @remaining_variable_storage: remaining available storage
• • @max_variable_size: max variable supported size
• • @attr: attributes to query storage for
• */

+struct smm_variable_query_info {

• u64 max_variable_storage;
  

• u64 remaining_variable_storage;
  

• u64 max_variable_size;
  

• u32 attr;
  

+};

+#define VAR_CHECK_VARIABLE_PROPERTY_REVISION 0x0001 +#define VAR_CHECK_VARIABLE_PROPERTY_READ_ONLY BIT(0) +/**

• • struct var_check_property - Used to store variable properties in StMM
• • @revision: magic revision number for variable property checking
• • @property: properties mask for the variable used in StMM.

• •          Currently RO flag is supported
    

• • @attributes: variable attributes used in StMM checking when properties

• •          for a variable are enabled
    

• • @minsize: minimum allowed size for variable payload checked against

• •          smm_variable_access->datasize in StMM
    

• • @maxsize: maximum allowed size for variable payload checked against

• •          smm_variable_access->datasize in StMM
    

• */

+struct var_check_property {

• u16 revision;
  

• u16 property;
  

• u32 attributes;
  

• size_t minsize;
  

• size_t maxsize;
  

+};

+/**

• • struct smm_variable_var_check_property - Used to communicate variable

• •                                      properties with StMM
    

• • @guid: vendor GUID
• • @name_size: size of EFI name
• • @property: variable properties struct
• • @name: variable name
• */

+struct smm_variable_var_check_property {

• efi_guid_t guid;
  

• size_t name_size;
  

• struct var_check_property property;
  

• u16 name[];
  

+};

+#endif /* _MM_COMMUNICATION_H_ */ diff --git a/drivers/firmware/efi/stmm/tee_stmm_efi.c b/drivers/firmware/efi/stmm/tee_stmm_efi.c new file mode 100644 index 000000000000..f6623171ae04 --- /dev/null +++ b/drivers/firmware/efi/stmm/tee_stmm_efi.c @@ -0,0 +1,638 @@ +// SPDX-License-Identifier: GPL-2.0+ +/*

• • EFI variable service via TEE
• • Copyright (C) 2022 Linaro
• */

+#include <linux/efi.h> +#include <linux/kernel.h> +#include <linux/slab.h> +#include <linux/tee.h> +#include <linux/tee_drv.h> +#include <linux/ucs2_string.h> +#include "mm_communication.h"

+static struct efivars tee_efivars; +static struct efivar_operations tee_efivar_ops;

+static size_t max_buffer_size; /* comm + var + func + data */ +static size_t max_payload_size; /* func + data */

+struct tee_stmm_efi_private {

• struct tee_context *ctx;
  

• u32 session;
  

• struct device *dev;
  

+};

+static struct tee_stmm_efi_private pvt_data;

+/* UUID of the stmm PTA */ +static const struct tee_client_device_id tee_stmm_efi_id_table[] = {

• {PTA_STMM_UUID},
  

• {}
  

+};

+static int tee_ctx_match(struct tee_ioctl_version_data *ver, const void *data) +{

• /* currently only OP-TEE is supported as a communication path */
  

• if (ver->impl_id == TEE_IMPL_ID_OPTEE)
  

•         return 1;
  

• else
  

•         return 0;
  

+}

+/**

• • tee_mm_communicate() - Pass a buffer to StandaloneMM running in TEE
• • @comm_buf: locally allocated communication buffer
• • @dsize: buffer size
• • Return: status code
• */

+static efi_status_t tee_mm_communicate(void *comm_buf, size_t dsize) +{

• size_t buf_size;
  

• efi_status_t ret;
  

• struct efi_mm_communicate_header *mm_hdr;
  

• struct tee_ioctl_invoke_arg arg;
  

• struct tee_param param[4];
  

• struct tee_shm *shm = NULL;
  

• int rc;
  

• if (!comm_buf)
  

•         return EFI_INVALID_PARAMETER;
  

• mm_hdr = (struct efi_mm_communicate_header *)comm_buf;
  

• buf_size = mm_hdr->message_len + sizeof(efi_guid_t) + sizeof(size_t);
  

• if (dsize != buf_size)
  

•         return EFI_INVALID_PARAMETER;
  

• shm = tee_shm_register_kernel_buf(pvt_data.ctx, comm_buf, buf_size);
  

• if (IS_ERR(shm)) {
  

•         dev_err(pvt_data.dev, "Unable to register shared memory\n");
  

•         return EFI_UNSUPPORTED;
  

• }
  

• memset(&arg, 0, sizeof(arg));
  

• arg.func = PTA_STMM_CMD_COMMUNICATE;
  

• arg.session = pvt_data.session;
  

• arg.num_params = 4;
  

• memset(param, 0, sizeof(param));
  

• param[0].attr = TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INOUT;
  

• param[0].u.memref.size = buf_size;
  

• param[0].u.memref.shm = shm;
  

• param[1].attr = TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_OUTPUT;
  

• param[2].attr = TEE_IOCTL_PARAM_ATTR_TYPE_NONE;
  

• param[3].attr = TEE_IOCTL_PARAM_ATTR_TYPE_NONE;
  

• rc = tee_client_invoke_func(pvt_data.ctx, &arg, param);
  

• tee_shm_free(shm);
  

• if (rc < 0 || arg.ret != 0) {
  

•         dev_err(pvt_data.dev,
  

•                 "PTA_STMM_CMD_COMMUNICATE invoke error: 0x%x\n", arg.ret);
  

•         return EFI_DEVICE_ERROR;
  

• }
  

• switch (param[1].u.value.a) {
  

• case ARM_SVC_SPM_RET_SUCCESS:
  

•         ret = EFI_SUCCESS;
  

•         break;
  

• case ARM_SVC_SPM_RET_INVALID_PARAMS:
  

•         ret = EFI_INVALID_PARAMETER;
  

•         break;
  

• case ARM_SVC_SPM_RET_DENIED:
  

•         ret = EFI_ACCESS_DENIED;
  

•         break;
  

• case ARM_SVC_SPM_RET_NO_MEMORY:
  

•         ret = EFI_OUT_OF_RESOURCES;
  

•         break;
  

• default:
  

•         ret = EFI_ACCESS_DENIED;
  

• }
  

• return ret;
  

+}

+/**

• • mm_communicate() - Adjust the communication buffer to StandAlonneMM and send
• • it to TEE
• • @comm_buf: locally allocated communication buffer, buffer should

• •               be enough big to have some headers and payload
    

• • @payload_size: payload size
• • Return: status code
• */

+static efi_status_t mm_communicate(u8 *comm_buf, size_t payload_size) +{

• size_t dsize;
  

• efi_status_t ret;
  

• struct efi_mm_communicate_header *mm_hdr;
  

• struct smm_variable_communicate_header *var_hdr;
  

• dsize = payload_size + MM_COMMUNICATE_HEADER_SIZE +
  

•         MM_VARIABLE_COMMUNICATE_SIZE;
  

• mm_hdr = (struct efi_mm_communicate_header *)comm_buf;
  

• var_hdr = (struct smm_variable_communicate_header *)mm_hdr->data;
  

• ret = tee_mm_communicate(comm_buf, dsize);
  

• if (ret != EFI_SUCCESS) {
  

•         dev_err(pvt_data.dev, "%s failed!\n", __func__);
  

•         return ret;
  

• }
  

• return var_hdr->ret_status;
  

+}

+/**

• • setup_mm_hdr() - Allocate a buffer for StandAloneMM and initialize the

• •               header data.
    

• • @dptr: pointer address to store allocated buffer
• • @payload_size: payload size
• • @func: standAloneMM function number
• • @ret: EFI return code
• • Return: pointer to corresponding StandAloneMM function buffer or NULL
• */

+static void *setup_mm_hdr(u8 **dptr, size_t payload_size, size_t func,

•                   efi_status_t *ret)
  

+{

• const efi_guid_t mm_var_guid = EFI_MM_VARIABLE_GUID;
  

• struct efi_mm_communicate_header *mm_hdr;
  

• struct smm_variable_communicate_header *var_hdr;
  

• u8 *comm_buf;
  

• /* In the init function we initialize max_buffer_size with
  

•  * get_max_payload(). So skip the test if max_buffer_size is initialized
  

•  * StandAloneMM will perform similar checks and drop the buffer if it's
  

•  * too long
  

•  */
  

• if (max_buffer_size &&
  

•     max_buffer_size < (MM_COMMUNICATE_HEADER_SIZE +
  

•                        MM_VARIABLE_COMMUNICATE_SIZE + payload_size)) {
  

•         *ret = EFI_INVALID_PARAMETER;
  

•         return NULL;
  

• }
  

• comm_buf = kzalloc(MM_COMMUNICATE_HEADER_SIZE +
  

•                            MM_VARIABLE_COMMUNICATE_SIZE + payload_size,
  

•                    GFP_KERNEL);
  

• if (!comm_buf) {
  

•         *ret = EFI_OUT_OF_RESOURCES;
  

•         return NULL;
  

• }
  

• mm_hdr = (struct efi_mm_communicate_header *)comm_buf;
  

• memcpy(&mm_hdr->header_guid, &mm_var_guid, sizeof(mm_hdr->header_guid));
  

• mm_hdr->message_len = MM_VARIABLE_COMMUNICATE_SIZE + payload_size;
  

• var_hdr = (struct smm_variable_communicate_header *)mm_hdr->data;
  

• var_hdr->function = func;
  

• if (dptr)
  

•         *dptr = comm_buf;
  

• *ret = EFI_SUCCESS;
  

• return var_hdr->data;
  

+}

+/**

• • get_max_payload() - Get variable payload size from StandAloneMM.
• • @size: size of the variable in storage
• • Return: status code
• */

+static efi_status_t get_max_payload(size_t *size) +{

• struct smm_variable_payload_size *var_payload = NULL;
  

• size_t payload_size;
  

• u8 *comm_buf = NULL;
  

• efi_status_t ret;
  

• if (!size) {
  

•         ret = EFI_INVALID_PARAMETER;
  

•         goto out;
  

• }
  

• payload_size = sizeof(*var_payload);
  

• var_payload = setup_mm_hdr(&comm_buf, payload_size,
  

•                            SMM_VARIABLE_FUNCTION_GET_PAYLOAD_SIZE,
  

•                            &ret);
  

• if (!comm_buf)
  

•         goto out;
  

• ret = mm_communicate(comm_buf, payload_size);
  

• if (ret != EFI_SUCCESS)
  

•         goto out;
  

• /* Make sure the buffer is big enough for storing variables */
  

• if (var_payload->size < MM_VARIABLE_ACCESS_HEADER_SIZE + 0x20) {
  

•         ret = EFI_DEVICE_ERROR;
  

•         goto out;
  

• }
  

• *size = var_payload->size;
  

• /*
  

•  * There seems to be a bug in EDK2 miscalculating the boundaries and
  

•  * size checks, so deduct 2 more bytes to fulfill this requirement. Fix
  

•  * it up here to ensure backwards compatibility with older versions
  

•  * (cf. StandaloneMmPkg/Drivers/StandaloneMmCpu/AArch64/EventHandle.c.
  

•  * sizeof (EFI_MM_COMMUNICATE_HEADER) instead the size minus the
  

•  * flexible array member).
  

•  *
  

•  * size is guaranteed to be > 2 due to checks on the beginning.
  

•  */
  

• *size -= 2;
  

+out:

• kfree(comm_buf);
  

• return ret;
  

+}

+static efi_status_t get_property_int(u16 *name, size_t name_size,

•                              const efi_guid_t *vendor,
  

•                              struct var_check_property *var_property)
  

+{

• struct smm_variable_var_check_property *smm_property;
  

• size_t payload_size;
  

• u8 *comm_buf = NULL;
  

• efi_status_t ret;
  

• memset(var_property, 0, sizeof(*var_property));
  

• payload_size = sizeof(*smm_property) + name_size;
  

• if (payload_size > max_payload_size) {
  

•         ret = EFI_INVALID_PARAMETER;
  

•         goto out;
  

• }
  

• smm_property = setup_mm_hdr(
  

•         &comm_buf, payload_size,
  

•         SMM_VARIABLE_FUNCTION_VAR_CHECK_VARIABLE_PROPERTY_GET, &ret);
  

• if (!comm_buf)
  

•         goto out;
  

• memcpy(&smm_property->guid, vendor, sizeof(smm_property->guid));
  

• smm_property->name_size = name_size;
  

• memcpy(smm_property->name, name, name_size);
  

• ret = mm_communicate(comm_buf, payload_size);
  

• /*
  

•  * Currently only R/O property is supported in StMM.
  

•  * Variables that are not set to R/O will not set the property in StMM
  

•  * and the call will return EFI_NOT_FOUND. We are setting the
  

•  * properties to 0x0 so checking against that is enough for the
  

•  * EFI_NOT_FOUND case.
  

•  */
  

• if (ret == EFI_NOT_FOUND)
  

•         ret = EFI_SUCCESS;
  

• if (ret != EFI_SUCCESS)
  

•         goto out;
  

• memcpy(var_property, &smm_property->property, sizeof(*var_property));
  

+out:

• kfree(comm_buf);
  

• return ret;
  

+}

+static efi_status_t tee_get_variable(u16 *name, efi_guid_t *vendor,

•                              u32 *attributes, unsigned long *data_size,
  

•                              void *data)
  

+{

• struct var_check_property var_property;
  

• struct smm_variable_access *var_acc;
  

• size_t payload_size;
  

• size_t name_size;
  

• size_t tmp_dsize;
  

• u8 *comm_buf = NULL;
  

• efi_status_t ret;
  

• if (!name || !vendor || !data_size) {
  

•         ret = EFI_INVALID_PARAMETER;
  

•         goto out;
  

• }
  

• name_size = (ucs2_strnlen(name, EFI_VAR_NAME_LEN) + 1) * sizeof(u16);
  

• if (name_size > max_payload_size - MM_VARIABLE_ACCESS_HEADER_SIZE) {
  

•         ret = EFI_INVALID_PARAMETER;
  

•         goto out;
  

• }
  

• /* Trim output buffer size */
  

• tmp_dsize = *data_size;
  

• if (name_size + tmp_dsize >
  

•     max_payload_size - MM_VARIABLE_ACCESS_HEADER_SIZE) {
  

•         tmp_dsize = max_payload_size - MM_VARIABLE_ACCESS_HEADER_SIZE -
  

•                     name_size;
  

• }
  

• /* Get communication buffer and initialize header */
  

• payload_size = MM_VARIABLE_ACCESS_HEADER_SIZE + name_size + tmp_dsize;
  

• var_acc = setup_mm_hdr(&comm_buf, payload_size,
  

•                        SMM_VARIABLE_FUNCTION_GET_VARIABLE, &ret);
  

• if (!comm_buf)
  

•         goto out;
  

• /* Fill in contents */
  

• memcpy(&var_acc->guid, vendor, sizeof(var_acc->guid));
  

• var_acc->data_size = tmp_dsize;
  

• var_acc->name_size = name_size;
  

• var_acc->attr = attributes ? *attributes : 0;
  

• memcpy(var_acc->name, name, name_size);
  

• /* Communicate */
  

• ret = mm_communicate(comm_buf, payload_size);
  

• if (ret == EFI_SUCCESS || ret == EFI_BUFFER_TOO_SMALL)
  

•         /* Update with reported data size for trimmed case */
  

•         *data_size = var_acc->data_size;
  

• if (ret != EFI_SUCCESS)
  

•         goto out;
  

• ret = get_property_int(name, name_size, vendor, &var_property);
  

• if (ret != EFI_SUCCESS)
  

•         goto out;
  

• if (attributes)
  

•         *attributes = var_acc->attr;
  

• if (data)
  

•         memcpy(data, (u8 *)var_acc->name + var_acc->name_size,
  

•                var_acc->data_size);
  

• else
  

•         ret = EFI_INVALID_PARAMETER;
  

+out:

• kfree(comm_buf);
  

• return ret;
  

+}

+static efi_status_t tee_get_next_variable(unsigned long *name_size,

•                                   efi_char16_t *name, efi_guid_t *guid)
  

+{

• struct smm_variable_getnext *var_getnext;
  

• size_t payload_size;
  

• size_t out_name_size;
  

• size_t in_name_size;
  

• u8 *comm_buf = NULL;
  

• efi_status_t ret;
  

• if (!name_size || !name || !guid) {
  

•         ret = EFI_INVALID_PARAMETER;
  

•         goto out;
  

• }
  

• out_name_size = *name_size;
  

• in_name_size = (ucs2_strnlen(name, EFI_VAR_NAME_LEN) + 1) * sizeof(u16);
  

• if (out_name_size < in_name_size) {
  

•         ret = EFI_INVALID_PARAMETER;
  

•         goto out;
  

• }
  

• if (in_name_size >
  

•     max_payload_size - MM_VARIABLE_GET_NEXT_HEADER_SIZE) {
  

•         ret = EFI_INVALID_PARAMETER;
  

•         goto out;
  

• }
  

• /* Trim output buffer size */
  

• if (out_name_size > max_payload_size - MM_VARIABLE_GET_NEXT_HEADER_SIZE)
  

•         out_name_size =
  

•                 max_payload_size - MM_VARIABLE_GET_NEXT_HEADER_SIZE;
  

• payload_size = MM_VARIABLE_GET_NEXT_HEADER_SIZE + out_name_size;
  

• var_getnext = setup_mm_hdr(&comm_buf, payload_size,
  

•                            SMM_VARIABLE_FUNCTION_GET_NEXT_VARIABLE_NAME,
  

•                            &ret);
  

• if (!comm_buf)
  

•         goto out;
  

• /* Fill in contents */
  

• memcpy(&var_getnext->guid, guid, sizeof(var_getnext->guid));
  

• var_getnext->name_size = out_name_size;
  

• memcpy(var_getnext->name, name, in_name_size);
  

• memset((u8 *)var_getnext->name + in_name_size, 0x0,
  

•        out_name_size - in_name_size);
  

• /* Communicate */
  

• ret = mm_communicate(comm_buf, payload_size);
  

• if (ret == EFI_SUCCESS || ret == EFI_BUFFER_TOO_SMALL) {
  

•         /* Update with reported data size for trimmed case */
  

•         *name_size = var_getnext->name_size;
  

• }
  

• if (ret != EFI_SUCCESS)
  

•         goto out;
  

• memcpy(guid, &var_getnext->guid, sizeof(*guid));
  

• memcpy(name, var_getnext->name, var_getnext->name_size);
  

+out:

• kfree(comm_buf);
  

• return ret;
  

+}

+static efi_status_t tee_set_variable(efi_char16_t *name, efi_guid_t *vendor,

•                              u32 attributes, unsigned long data_size,
  

•                              void *data)
  

+{

• efi_status_t ret;
  

• struct var_check_property var_property;
  

• struct smm_variable_access *var_acc;
  

• size_t payload_size;
  

• size_t name_size;
  

• u8 *comm_buf = NULL;
  

• if (!name || name[0] == 0 || !vendor) {
  

•         ret = EFI_INVALID_PARAMETER;
  

•         goto out;
  

• }
  

• if (data_size > 0 && !data) {
  

•         ret = EFI_INVALID_PARAMETER;
  

•         goto out;
  

• }
  

• /* Check payload size */
  

• name_size = (ucs2_strnlen(name, EFI_VAR_NAME_LEN) + 1) * sizeof(u16);
  

• payload_size = MM_VARIABLE_ACCESS_HEADER_SIZE + name_size + data_size;
  

• if (payload_size > max_payload_size) {
  

•         ret = EFI_INVALID_PARAMETER;
  

•         goto out;
  

• }
  

• /*
  

•  * Allocate the buffer early, before switching to RW (if needed)
  

•  * so we won't need to account for any failures in reading/setting
  

•  * the properties, if the allocation fails
  

•  */
  

• var_acc = setup_mm_hdr(&comm_buf, payload_size,
  

•                        SMM_VARIABLE_FUNCTION_SET_VARIABLE, &ret);
  

• if (!comm_buf)
  

•         goto out;
  

• /*
  

•  * The API has the ability to override RO flags. If no RO check was
  

•  * requested switch the variable to RW for the duration of this call
  

•  */
  

• ret = get_property_int(name, name_size, vendor, &var_property);
  

• if (ret != EFI_SUCCESS) {
  

•         dev_err(pvt_data.dev, "Getting variable property failed\n");
  

•         goto out;
  

• }
  

• if (var_property.property & VAR_CHECK_VARIABLE_PROPERTY_READ_ONLY) {
  

•         ret = EFI_WRITE_PROTECTED;
  

•         goto out;
  

• }
  

• /* Fill in contents */
  

• memcpy(&var_acc->guid, vendor, sizeof(var_acc->guid));
  

• var_acc->data_size = data_size;
  

• var_acc->name_size = name_size;
  

• var_acc->attr = attributes;
  

• memcpy(var_acc->name, name, name_size);
  

• memcpy((u8 *)var_acc->name + name_size, data, data_size);
  

• /* Communicate */
  

• ret = mm_communicate(comm_buf, payload_size);
  

• dev_dbg(pvt_data.dev, "Set Variable %s %d %lx\n", __FILE__, __LINE__, ret);
  

+out:

• kfree(comm_buf);
  

• return ret;
  

+}

+static efi_status_t tee_set_variable_nonblocking(efi_char16_t *name,

•                                          efi_guid_t *vendor,
  

•                                          u32 attributes,
  

•                                          unsigned long data_size,
  

•                                          void *data)
  

+{

• return EFI_UNSUPPORTED;
  

+}

+static efi_status_t tee_query_variable_info(u32 attributes,

•                                     u64 *max_variable_storage_size,
  

•                                     u64 *remain_variable_storage_size,
  

•                                     u64 *max_variable_size)
  

+{

• struct smm_variable_query_info *mm_query_info;
  

• size_t payload_size;
  

• efi_status_t ret;
  

• u8 *comm_buf;
  

• payload_size = sizeof(*mm_query_info);
  

• mm_query_info = setup_mm_hdr(&comm_buf, payload_size,
  

•                         SMM_VARIABLE_FUNCTION_QUERY_VARIABLE_INFO,
  

•                         &ret);
  

• if (!comm_buf)
  

•         goto out;
  

• mm_query_info->attr = attributes;
  

• ret = mm_communicate(comm_buf, payload_size);
  

• if (ret != EFI_SUCCESS)
  

•         goto out;
  

• *max_variable_storage_size = mm_query_info->max_variable_storage;
  

• *remain_variable_storage_size =
  

•         mm_query_info->remaining_variable_storage;
  

• *max_variable_size = mm_query_info->max_variable_size;
  

+out:

• kfree(comm_buf);
  

• return ret;
  

+}

+static int tee_stmm_efi_probe(struct device *dev) +{

• struct tee_ioctl_open_session_arg sess_arg;
  

• efi_status_t ret;
  

• int rc;
  

• /* Open context with TEE driver */
  

• pvt_data.ctx = tee_client_open_context(NULL, tee_ctx_match, NULL, NULL);
  

• if (IS_ERR(pvt_data.ctx))
  

•         return -ENODEV;
  

• /* Open session with StMM PTA */
  

• memset(&sess_arg, 0, sizeof(sess_arg));
  

• export_uuid(sess_arg.uuid, &tee_stmm_efi_id_table[0].uuid);
  

• rc = tee_client_open_session(pvt_data.ctx, &sess_arg, NULL);
  

• if ((rc < 0) || (sess_arg.ret != 0)) {
  

•         dev_err(dev, "tee_client_open_session failed, err: %x\n",
  

•                 sess_arg.ret);
  

•         rc = -EINVAL;
  

•         goto out_ctx;
  

• }
  

• pvt_data.session = sess_arg.session;
  

• pvt_data.dev = dev;
  

• ret = get_max_payload(&max_payload_size);
  

• if (ret != EFI_SUCCESS) {
  

•         rc = -EIO;
  

•         goto out_sess;
  

• }
  

• max_buffer_size = MM_COMMUNICATE_HEADER_SIZE +
  

•                   MM_VARIABLE_COMMUNICATE_SIZE +
  

•                   max_payload_size;
  

• tee_efivar_ops.get_variable = tee_get_variable;
  

• tee_efivar_ops.get_next_variable = tee_get_next_variable;
  

• tee_efivar_ops.set_variable = tee_set_variable;
  

• tee_efivar_ops.set_variable_nonblocking = tee_set_variable_nonblocking;
  

• tee_efivar_ops.query_variable_store = efi_query_variable_store;
  

• tee_efivar_ops.query_variable_info = tee_query_variable_info;
  

• efivars_generic_ops_unregister();
  

• pr_info("Use tee-based EFI runtime variable services\n");
  

• efivars_register(&tee_efivars, &tee_efivar_ops);
  

• return 0;
  

+out_sess:

• tee_client_close_session(pvt_data.ctx, pvt_data.session);
  

+out_ctx:

• tee_client_close_context(pvt_data.ctx);
  

• return rc;
  

+}

+static int tee_stmm_efi_remove(struct device *dev) +{

• efivars_unregister(&tee_efivars);
  

• efivars_generic_ops_register();
  

• tee_client_close_session(pvt_data.ctx, pvt_data.session);
  

• tee_client_close_context(pvt_data.ctx);
  

• return 0;
  

+}

+MODULE_DEVICE_TABLE(tee, tee_stmm_efi_id_table);

+static struct tee_client_driver tee_stmm_efi_driver = {

• .id_table       = tee_stmm_efi_id_table,
  

• .driver         = {
  

•         .name           = "tee-stmm-efi",
  

•         .bus            = &tee_bus_type,
  

•         .probe          = tee_stmm_efi_probe,
  

•         .remove         = tee_stmm_efi_remove,
  

• },
  

+};

+static int __init tee_stmm_efi_mod_init(void) +{

• return driver_register(&tee_stmm_efi_driver.driver);
  

+}

+static void __exit tee_stmm_efi_mod_exit(void) +{

• driver_unregister(&tee_stmm_efi_driver.driver);
  

+}

+module_init(tee_stmm_efi_mod_init); +module_exit(tee_stmm_efi_mod_exit);

+MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Ilias Apalodimas ilias.apalodimas@linaro.org"); +MODULE_AUTHOR("Masahisa Kojima masahisa.kojima@linaro.org"); +MODULE_DESCRIPTION("TEE based EFI runtime variable service driver");

I think we have a probe ordering issue with this driver: efivarfs_fill_super() may be called before the TEE bus was probed, thus with the default efivar ops still registered. And that means efivar_supports_writes() will return false, and the fs declares itself as readonly. I've seen systemd mounting it r/o initialling, and you need to remount the fs to enable writability.

Is there anything that could be done to re-order things reliably, probe the tee bus earlier etc.?

This driver has a dependency on user-space daemon: tee-supplicant to be running for RPMB access. So once you start that daemon the corresponding device will be enumerated on the TEE bus and this driver probe will be invoked. So I would suggest you to load this daemon very early in the boot process or better to make it a part of initramfs.

-Sumit

Jan

-- Siemens AG, Technology Competence Center Embedded Linux

On Thu, 8 Jun 2023 at 16:52, Ard Biesheuvel ardb@kernel.org wrote:

On Thu, 8 Jun 2023 at 08:22, Ilias Apalodimas ilias.apalodimas@linaro.org wrote:

...

Hi Jan

On Wed, 7 Jun 2023 at 22:46, Jan Kiszka jan.kiszka@siemens.com wrote:

...

On 07.06.23 20:17, Ilias Apalodimas wrote:

...

On Wed, 7 Jun 2023 at 20:14, Jan Kiszka jan.kiszka@siemens.com wrote:

...

On 07.06.23 18:59, Ilias Apalodimas wrote:

...

On Wed, 7 Jun 2023 at 19:09, Ilias Apalodimas ilias.apalodimas@linaro.org wrote: > > Hi Jan, > > [...] >>>>> No I don't, this will work reliably without the need to remount the efivarfs. >>>>> As you point out you will still have this dependency if you end up >>>>> building them as modules and you manage to mount the efivarfs before >>>>> those get inserted. Does anyone see a reasonable workaround? >>>>> Deceiving the kernel and making the bootloader set the RT property bit >>>>> to force the filesystem being mounted as rw is a nasty hack that we >>>>> should avoid. Maybe adding a kernel command line parameter that says >>>>> "Ignore the RTPROP I know what I am doing"? I don't particularly love >>>>> this either, but it's not unreasonable. >>>> >>>> In the context of https://github.com/OP-TEE/optee_os/issues/6094, >>>> basically this issue mapped on reboot/shutdown, I would really love to >>>> see the unhandy tee-supplicant daemon to be overcome. >>> >>> I have seen this error before and it has been on my todo list. So I >>> have tried to fix it here [1]. Feel free to test it and let me know if >>> you see any further issues. >>> >>> [1] https://lkml.org/lkml/2023/6/7/927 >>> >> >> Ah, nice, will test ASAP! >> >> Meanwhile more food: I managed to build a firmware that was missing >> STMM. But the driver loaded, and I got this: > > Thanks for the testing. I'll try to reproduce it locally and get back to you

Can you provide a bit more info on how that was triggered btw? I would be helpful to know

• OP-TEE version

Today's master, 145953d55.

...

• was it compiled as a module or built-in?

Sorry, not sure anymore, switching back and forth right now. I think it was built-in.

...

• was the supplicant running?

Yes.

Ok thanks, that helps. I guess this also means U-Boot was compiled to store the variables in a file in the ESP instead of the RPMB right? Otherwise, I can't see how the device booted in the first place.

U-Boot was not configured to perform secure booting in this case. It had RPMB support enabled, just didn't have to use it.

In your initial mail you said you managed to build a firmware without StMM. If U-boot isn't reconfigured accordingly -- iow skip the EFI variable storage in an RPMB, the EFI subsystem will fail to start.

In any case, I don't think the ooops you are seeing is not connected to this patchset. Looking at the kernel EFI stub we only set the SetVariableRT if the RTPROP table is set accordingly by the firmware. U-Boot never sets the EFI_RT_SUPPORTED_SET_VARIABLE property since it can't support it. What you are doing is remount the efivarfs as rw and then trying to set a variable, but the callback for it is NULL. I think you'll be able to replicate the same behavior on the kernel without even inserting the new module.

I have dropped this series from efi/next for now, given that it obviously has problems in its current state.

The risk of merging this now and fixing it later is that it may cause regressions for early adopters that rely on the behavior we are introducing here. Better to get this in shape first.

The ooops Jan was seeing is reproducible in the current code with $ sudo mount -o remount,rw /sys/firmware/efi/efivars $ sudo efi-updatevar -f PK.auth PK

So the only real problem we are discussing here is users having to remount the efivarfs once the module is inserted and the supplicant is running right? We could do something along the lines of the patch below. That would solve both of the problems.

However, the patch changes the way efivarfs is mounted -- it's now always mounted as RW. What I am worried about is userspace tools that rely on this. I know fwupd uses it and looks for a RO mounted efivarfs on it's initial checking, but since userspace apps are already dealing with firmware that exposes SetVariableRT but always returns EFI_UNSUPPORTED this should be safe ?(famous last words)

Jan can you please apply this and see if it solves your problem?

diff --git a/drivers/firmware/efi/efi.c b/drivers/firmware/efi/efi.c index 4cc8d0e7d0fd..37accd9e885c 100644 --- a/drivers/firmware/efi/efi.c +++ b/drivers/firmware/efi/efi.c @@ -206,6 +206,13 @@ static bool generic_ops_supported(void) return true; }

+efi_status_t set_variable_int(efi_char16_t *name, efi_guid_t *vendor, + u32 attributes, unsigned long data_size, + void *data) +{ + return EFI_UNSUPPORTED; +} + static int generic_ops_register(void) { if (!generic_ops_supported()) @@ -219,6 +226,9 @@ static int generic_ops_register(void) if (efi_rt_services_supported(EFI_RT_SUPPORTED_SET_VARIABLE)) { generic_ops.set_variable = efi.set_variable; generic_ops.set_variable_nonblocking = efi.set_variable_nonblocking; + } else { + generic_ops.set_variable = set_variable_int; + generic_ops.set_variable_nonblocking = set_variable_int; } return efivars_register(&generic_efivars, &generic_ops); } diff --git a/drivers/firmware/efi/vars.c b/drivers/firmware/efi/vars.c index e9dc7116daf1..c75eff3f409d 100644 --- a/drivers/firmware/efi/vars.c +++ b/drivers/firmware/efi/vars.c @@ -123,7 +123,7 @@ EXPORT_SYMBOL_GPL(efivars_unregister);

bool efivar_supports_writes(void) { - return __efivars && __efivars->ops->set_variable; + return __efivars && __efivars->ops->set_variable != set_variable_int; } EXPORT_SYMBOL_GPL(efivar_supports_writes);

diff --git a/fs/efivarfs/super.c b/fs/efivarfs/super.c index e028fafa04f3..e40b5c4c5106 100644 --- a/fs/efivarfs/super.c +++ b/fs/efivarfs/super.c @@ -242,9 +242,6 @@ static int efivarfs_fill_super(struct super_block *sb, struct fs_context *fc) sb->s_d_op = &efivarfs_d_ops; sb->s_time_gran = 1;

- if (!efivar_supports_writes()) - sb->s_flags |= SB_RDONLY; - inode = efivarfs_get_inode(sb, NULL, S_IFDIR | 0755, 0, true); if (!inode) return -ENOMEM; diff --git a/include/linux/efi.h b/include/linux/efi.h index 58d1c271d3b0..ec0ac6ef50a3 100644 --- a/include/linux/efi.h +++ b/include/linux/efi.h @@ -1084,6 +1084,10 @@ int efivars_register(struct efivars *efivars, const struct efivar_operations *ops); int efivars_unregister(struct efivars *efivars);

+efi_status_t set_variable_int(efi_char16_t *name, efi_guid_t *vendor, + u32 attributes, unsigned long data_size, + void *data); + void efivars_generic_ops_register(void); void efivars_generic_ops_unregister(void);

apalos@hades:~/work/linux-next>; apalos@hades:~/work/linux-next>git diff diff --git a/drivers/firmware/efi/efi.c b/drivers/firmware/efi/efi.c index 4cc8d0e7d0fd..37accd9e885c 100644 --- a/drivers/firmware/efi/efi.c +++ b/drivers/firmware/efi/efi.c @@ -206,6 +206,13 @@ static bool generic_ops_supported(void) return true; }

+efi_status_t set_variable_int(efi_char16_t *name, efi_guid_t *vendor, + u32 attributes, unsigned long data_size, + void *data) +{ + return EFI_UNSUPPORTED; +} + static int generic_ops_register(void) { if (!generic_ops_supported()) @@ -219,6 +226,9 @@ static int generic_ops_register(void) if (efi_rt_services_supported(EFI_RT_SUPPORTED_SET_VARIABLE)) { generic_ops.set_variable = efi.set_variable; generic_ops.set_variable_nonblocking = efi.set_variable_nonblocking; + } else { + generic_ops.set_variable = set_variable_int; + generic_ops.set_variable_nonblocking = set_variable_int; } return efivars_register(&generic_efivars, &generic_ops); } diff --git a/drivers/firmware/efi/vars.c b/drivers/firmware/efi/vars.c index e9dc7116daf1..c75eff3f409d 100644 --- a/drivers/firmware/efi/vars.c +++ b/drivers/firmware/efi/vars.c @@ -123,7 +123,7 @@ EXPORT_SYMBOL_GPL(efivars_unregister);

bool efivar_supports_writes(void) { - return __efivars && __efivars->ops->set_variable; + return __efivars && __efivars->ops->set_variable != set_variable_int; } EXPORT_SYMBOL_GPL(efivar_supports_writes);

diff --git a/fs/efivarfs/super.c b/fs/efivarfs/super.c index e028fafa04f3..e40b5c4c5106 100644 --- a/fs/efivarfs/super.c +++ b/fs/efivarfs/super.c @@ -242,9 +242,6 @@ static int efivarfs_fill_super(struct super_block *sb, struct fs_context *fc) sb->s_d_op = &efivarfs_d_ops; sb->s_time_gran = 1;

- if (!efivar_supports_writes()) - sb->s_flags |= SB_RDONLY; - inode = efivarfs_get_inode(sb, NULL, S_IFDIR | 0755, 0, true); if (!inode) return -ENOMEM; diff --git a/include/linux/efi.h b/include/linux/efi.h index 58d1c271d3b0..ec0ac6ef50a3 100644 --- a/include/linux/efi.h +++ b/include/linux/efi.h @@ -1084,6 +1084,10 @@ int efivars_register(struct efivars *efivars, const struct efivar_operations *ops); int efivars_unregister(struct efivars *efivars);

+efi_status_t set_variable_int(efi_char16_t *name, efi_guid_t *vendor, + u32 attributes, unsigned long data_size, + void *data); + void efivars_generic_ops_register(void); void efivars_generic_ops_unregister(void);

Thanks /Ilias

Hi Jan,

[...]

...

--- a/drivers/firmware/efi/vars.c +++ b/drivers/firmware/efi/vars.c @@ -123,7 +123,7 @@ EXPORT_SYMBOL_GPL(efivars_unregister);

bool efivar_supports_writes(void) {

•   return __efivars && __efivars->ops->set_variable;
  

•   return __efivars && __efivars->ops->set_variable != set_variable_int;
  

} EXPORT_SYMBOL_GPL(efivar_supports_writes);

diff --git a/fs/efivarfs/super.c b/fs/efivarfs/super.c index e028fafa04f3..e40b5c4c5106 100644 --- a/fs/efivarfs/super.c +++ b/fs/efivarfs/super.c @@ -242,9 +242,6 @@ static int efivarfs_fill_super(struct super_block *sb, struct fs_context *fc) sb->s_d_op = &efivarfs_d_ops; sb->s_time_gran = 1;

•   if (!efivar_supports_writes())
  

•           sb->s_flags |= SB_RDONLY;
  

•   inode = efivarfs_get_inode(sb, NULL, S_IFDIR | 0755, 0, true);
    if (!inode)
            return -ENOMEM;
  

diff --git a/include/linux/efi.h b/include/linux/efi.h index 58d1c271d3b0..ec0ac6ef50a3 100644 --- a/include/linux/efi.h +++ b/include/linux/efi.h @@ -1084,6 +1084,10 @@ int efivars_register(struct efivars *efivars, const struct efivar_operations *ops); int efivars_unregister(struct efivars *efivars);

+efi_status_t set_variable_int(efi_char16_t *name, efi_guid_t *vendor,

•                         u32 attributes, unsigned long data_size,
  

•                         void *data);
  

void efivars_generic_ops_register(void); void efivars_generic_ops_unregister(void);

Thanks /Ilias

As just written in my other reply: The root cause is the dependency on tee-supplicant daemon. That needs to be resolved, and then also r/w mounting will just work.

That's partially true. If we solve the dependency your problem will go away only if everything gets compiled as built in. But if you have them as modules there's still a chance you mount the efivarfs before installing all the modules. In that case, you'll end up with the same problem no?

That's why I think this patch (or a variation of it) is useful. It solves the kernel panic you are seeing if you remount the efivarfs as RW and It unifies the way the kernel responds to userspace no matter what the firmware does with its setvariableRT service.

Thanks /Ilias

Jan

-- Siemens AG, Technology Competence Center Embedded Linux

Hi Jan,

On Fri, 9 Jun 2023 at 09:40, Jan Kiszka jan.kiszka@siemens.com wrote:

On 09.06.23 08:34, Ilias Apalodimas wrote:

...

Hi Jan,

[...]

...

...

--- a/drivers/firmware/efi/vars.c +++ b/drivers/firmware/efi/vars.c @@ -123,7 +123,7 @@ EXPORT_SYMBOL_GPL(efivars_unregister);

bool efivar_supports_writes(void) {

•   return __efivars && __efivars->ops->set_variable;
  

•   return __efivars && __efivars->ops->set_variable != set_variable_int;
  

} EXPORT_SYMBOL_GPL(efivar_supports_writes);

diff --git a/fs/efivarfs/super.c b/fs/efivarfs/super.c index e028fafa04f3..e40b5c4c5106 100644 --- a/fs/efivarfs/super.c +++ b/fs/efivarfs/super.c @@ -242,9 +242,6 @@ static int efivarfs_fill_super(struct super_block *sb, struct fs_context *fc) sb->s_d_op = &efivarfs_d_ops; sb->s_time_gran = 1;

•   if (!efivar_supports_writes())
  

•           sb->s_flags |= SB_RDONLY;
  

•   inode = efivarfs_get_inode(sb, NULL, S_IFDIR | 0755, 0, true);
    if (!inode)
            return -ENOMEM;
  

diff --git a/include/linux/efi.h b/include/linux/efi.h index 58d1c271d3b0..ec0ac6ef50a3 100644 --- a/include/linux/efi.h +++ b/include/linux/efi.h @@ -1084,6 +1084,10 @@ int efivars_register(struct efivars *efivars, const struct efivar_operations *ops); int efivars_unregister(struct efivars *efivars);

+efi_status_t set_variable_int(efi_char16_t *name, efi_guid_t *vendor,

•                         u32 attributes, unsigned long data_size,
  

•                         void *data);
  

void efivars_generic_ops_register(void); void efivars_generic_ops_unregister(void);

Thanks /Ilias

As just written in my other reply: The root cause is the dependency on tee-supplicant daemon. That needs to be resolved, and then also r/w mounting will just work.

That's partially true. If we solve the dependency your problem will go away only if everything gets compiled as built in. But if you have them as modules there's still a chance you mount the efivarfs before installing all the modules. In that case, you'll end up with the same problem no?

Obviously, this will need proper probing of the TA services in the proper order so that the STMM driver is pulled in before efivarfs gets used.

...

That's why I think this patch (or a variation of it) is useful. It solves the kernel panic you are seeing if you remount the efivarfs as RW and It unifies the way the kernel responds to userspace no matter what the firmware does with its setvariableRT service.

I'm not against fixes crashes, but the r/w issue is a different thing IMHO.

Fair enough, but if we want to fix the crash only I think there's a better way to do it. I'll cook some patches and send them over

Thanks /Ilias

Jan

-- Siemens AG, Technology Competence Center Embedded Linux