- OP-TEE - lists.trustedfirmware.org

[PATCH] tee: optee: Add SMC for loading OP-TEE image

by Jeffrey Kardatzke

Adds an SMC call that will pass an OP-TEE binary image to EL3 and instruct it to load it as the BL32 payload. This works in conjunction with a feature added to Trusted Firmware for ARM that supports this. Signed-off-by: Jeffrey Kardatzke <jkardatzke(a)chromium.org> Signed-off-by: Jeffrey Kardatzke <jkardatzke(a)google.com> --- drivers/tee/optee/Kconfig | 10 +++++ drivers/tee/optee/optee_msg.h | 14 +++++++ drivers/tee/optee/optee_smc.h | 22 ++++++++++ drivers/tee/optee/smc_abi.c | 77 +++++++++++++++++++++++++++++++++++ 4 files changed, 123 insertions(+) diff --git a/drivers/tee/optee/Kconfig b/drivers/tee/optee/Kconfig index f121c224e682..5ffbeb3eaac0 100644 --- a/drivers/tee/optee/Kconfig +++ b/drivers/tee/optee/Kconfig @@ -7,3 +7,13 @@ config OPTEE help This implements the OP-TEE Trusted Execution Environment (TEE) driver. + +config OPTEE_LOAD_IMAGE + bool "Load Op-Tee image as firmware" + default n + depends on OPTEE + help + This loads the BL32 image for OP-TEE as firmware when the driver is probed. + This returns -EPROBE_DEFER until the firmware is loadable from the + filesystem which is determined by checking the system_state until it is in + SYSTEM_RUNNING. diff --git a/drivers/tee/optee/optee_msg.h b/drivers/tee/optee/optee_msg.h index 70e9cc2ee96b..84c1b15032a9 100644 --- a/drivers/tee/optee/optee_msg.h +++ b/drivers/tee/optee/optee_msg.h @@ -284,6 +284,20 @@ struct optee_msg_arg { */ #define OPTEE_MSG_FUNCID_GET_OS_REVISION 0x0001 +/* + * Load Trusted OS from optee/tee.bin in the Linux firmware. + * + * WARNING: Use this cautiously as it could lead to insecure loading of the + * Trusted OS. + * This SMC instructs EL3 to load a binary and excute it as the Trusted OS. + * The first two params are the high and low 32 bits of the size of the payload + * and the third and fourth params are the high and low 32 bits of the physical + * address of the payload. The payload is in the OP-TEE image format. + * + * Returns 0 on success and an error code otherwise. + */ +#define OPTEE_MSG_FUNCID_LOAD_IMAGE 0x0002 + /* * Do a secure call with struct optee_msg_arg as argument * The OPTEE_MSG_CMD_* below defines what goes in struct optee_msg_arg::cmd diff --git a/drivers/tee/optee/optee_smc.h b/drivers/tee/optee/optee_smc.h index 73b5e7760d10..908b1005e9db 100644 --- a/drivers/tee/optee/optee_smc.h +++ b/drivers/tee/optee/optee_smc.h @@ -104,6 +104,28 @@ struct optee_smc_call_get_os_revision_result { unsigned long reserved1; }; +/* + * Load Trusted OS from optee/tee.bin in the Linux firmware. + * + * WARNING: Use this cautiously as it could lead to insecure loading of the + * Trusted OS. + * This SMC instructs EL3 to load a binary and excute it as the Trusted OS. + * + * Call register usage: + * a0 SMC Function ID, OPTEE_SMC_CALL_LOAD_IMAGE + * a1 Upper 32bit of a 64bit size for the payload + * a2 Lower 32bit of a 64bit size for the payload + * a3 Upper 32bit of the physical address for the payload + * a4 Lower 32bit of the physical address for the payload + * + * The payload is in the OP-TEE image format. + * + * Returns result in a0, 0 on success and an error code otherwise. + */ +#define OPTEE_SMC_FUNCID_LOAD_IMAGE OPTEE_MSG_FUNCID_LOAD_IMAGE +#define OPTEE_SMC_CALL_LOAD_IMAGE \ + OPTEE_SMC_FAST_CALL_VAL(OPTEE_SMC_FUNCID_LOAD_IMAGE) + /* * Call with struct optee_msg_arg as argument * diff --git a/drivers/tee/optee/smc_abi.c b/drivers/tee/optee/smc_abi.c index a1c1fa1a9c28..c1abbee86b39 100644 --- a/drivers/tee/optee/smc_abi.c +++ b/drivers/tee/optee/smc_abi.c @@ -8,9 +8,11 @@ #include <linux/arm-smccc.h> #include <linux/errno.h> +#include <linux/firmware.h> #include <linux/interrupt.h> #include <linux/io.h> #include <linux/irqdomain.h> +#include <linux/kernel.h> #include <linux/mm.h> #include <linux/module.h> #include <linux/of.h> @@ -1354,6 +1356,77 @@ static void optee_shutdown(struct platform_device *pdev) optee_disable_shm_cache(optee); } +#ifdef CONFIG_OPTEE_LOAD_IMAGE + +#define OPTEE_FW_IMAGE "optee/tee.bin" + +static int optee_load_fw(struct platform_device *pdev, + optee_invoke_fn *invoke_fn) +{ + const struct firmware *fw = NULL; + struct arm_smccc_res res; + phys_addr_t data_pa; + u8 *data_buf = NULL; + u64 data_size; + u32 data_pa_high, data_pa_low; + u32 data_size_high, data_size_low; + int rc; + + rc = request_firmware(&fw, OPTEE_FW_IMAGE, &pdev->dev); + if (rc) { + /* + * The firmware in the rootfs will not be accessible until we + * are in the SYSTEM_RUNNING state, so return EPROBE_DEFER until + * that point. + */ + if (system_state < SYSTEM_RUNNING) + return -EPROBE_DEFER; + goto fw_err; + } + + data_size = fw->size; + /* + * This uses the GFP_DMA flag to ensure we are allocated memory in the + * 32-bit space since TF-A cannot map memory beyond the 32-bit boundary. + */ + data_buf = kmalloc(fw->size, GFP_KERNEL | GFP_DMA); + if (!data_buf) { + rc = -ENOMEM; + goto fw_err; + } + memcpy(data_buf, fw->data, fw->size); + data_pa = virt_to_phys(data_buf); + reg_pair_from_64(&data_pa_high, &data_pa_low, data_pa); + reg_pair_from_64(&data_size_high, &data_size_low, data_size); + goto fw_load; + +fw_err: + pr_warn("image loading failed\n"); + data_pa_high = data_pa_low = data_size_high = data_size_low = 0; + +fw_load: + /* + * Always invoke the SMC, even if loading the image fails, to indicate + * to EL3 that we have passed the point where it should allow invoking + * this SMC. + */ + invoke_fn(OPTEE_SMC_CALL_LOAD_IMAGE, data_size_high, data_size_low, + data_pa_high, data_pa_low, 0, 0, 0, &res); + if (!rc) + rc = res.a0; + if (fw) + release_firmware(fw); + kfree(data_buf); + + return rc; +} +#else +static inline int optee_load_fw(struct platform_device *__unused, + optee_invoke_fn *__unused) { + return 0; +} +#endif + static int optee_probe(struct platform_device *pdev) { optee_invoke_fn *invoke_fn; @@ -1372,6 +1445,10 @@ static int optee_probe(struct platform_device *pdev) if (IS_ERR(invoke_fn)) return PTR_ERR(invoke_fn); + rc = optee_load_fw(pdev, invoke_fn); + if (rc) + return rc; + if (!optee_msg_api_uid_is_optee_api(invoke_fn)) { pr_warn("api uid mismatch\n"); return -EINVAL; -- 2.39.2.637.g21b0678d19-goog

3 years

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10
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[GIT PULL] Fix race condition in AMDTEE driver

by Jens Wiklander

Hello arm-soc maintainers, Please pull this fix for the AMDTEE driver in the TEE subsystem. Note that this isn't a usual Arm driver update. This targets AMD instead, but is part of the TEE subsystem. Thanks, Jens The following changes since commit c9c3395d5e3dcc6daee66c6908354d47bf98cb0c: Linux 6.2 (2023-02-19 14:24:22 -0800) are available in the Git repository at: https://git.linaro.org/people/jens.wiklander/linux-tee.git/ tags/amdtee-fix-for-v6.3 for you to fetch changes up to f8502fba45bd30e1a6a354d9d898bc99d1a11e6d: tee: amdtee: fix race condition in amdtee_open_session (2023-02-28 18:39:19 +0100) ---------------------------------------------------------------- AMDTEE fix race condition in amdtee_open_session() ---------------------------------------------------------------- Rijo Thomas (1): tee: amdtee: fix race condition in amdtee_open_session drivers/tee/amdtee/core.c | 29 ++++++++++++++--------------- 1 file changed, 14 insertions(+), 15 deletions(-)

3 years

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[PATCH 1/1] tee: amdtee: fix race condition in amdtee_open_session

by Rijo Thomas

There is a potential race condition in amdtee_open_session that may lead to use-after-free. For instance, in amdtee_open_session() after sess->sess_mask is set, and before setting: sess->session_info[i] = session_info; if amdtee_close_session() closes this same session, then 'sess' data structure will be released, causing kernel panic when 'sess' is accessed within amdtee_open_session(). The solution is to set the bit sess->sess_mask as the last step in amdtee_open_session(). Fixes: 757cc3e9ff1d ("tee: add AMD-TEE driver") Cc: stable(a)vger.kernel.org Signed-off-by: Rijo Thomas <Rijo-john.Thomas(a)amd.com> --- drivers/tee/amdtee/core.c | 29 ++++++++++++++--------------- 1 file changed, 14 insertions(+), 15 deletions(-) diff --git a/drivers/tee/amdtee/core.c b/drivers/tee/amdtee/core.c index 297dc62bca29..372d64756ed6 100644 --- a/drivers/tee/amdtee/core.c +++ b/drivers/tee/amdtee/core.c @@ -267,35 +267,34 @@ int amdtee_open_session(struct tee_context *ctx, goto out; } + /* Open session with loaded TA */ + handle_open_session(arg, &session_info, param); + if (arg->ret != TEEC_SUCCESS) { + pr_err("open_session failed %d\n", arg->ret); + handle_unload_ta(ta_handle); + kref_put(&sess->refcount, destroy_session); + goto out; + } + /* Find an empty session index for the given TA */ spin_lock(&sess->lock); i = find_first_zero_bit(sess->sess_mask, TEE_NUM_SESSIONS); - if (i < TEE_NUM_SESSIONS) + if (i < TEE_NUM_SESSIONS) { + sess->session_info[i] = session_info; + set_session_id(ta_handle, i, &arg->session); set_bit(i, sess->sess_mask); + } spin_unlock(&sess->lock); if (i >= TEE_NUM_SESSIONS) { pr_err("reached maximum session count %d\n", TEE_NUM_SESSIONS); + handle_close_session(ta_handle, session_info); handle_unload_ta(ta_handle); kref_put(&sess->refcount, destroy_session); rc = -ENOMEM; goto out; } - /* Open session with loaded TA */ - handle_open_session(arg, &session_info, param); - if (arg->ret != TEEC_SUCCESS) { - pr_err("open_session failed %d\n", arg->ret); - spin_lock(&sess->lock); - clear_bit(i, sess->sess_mask); - spin_unlock(&sess->lock); - handle_unload_ta(ta_handle); - kref_put(&sess->refcount, destroy_session); - goto out; - } - - sess->session_info[i] = session_info; - set_session_id(ta_handle, i, &arg->session); out: free_pages((u64)ta, get_order(ta_size)); return rc; -- 2.25.1

3 years

2
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Hafnium Dynamic Shared Memory

by 梅建强(禹夜)

Hi, experts Here are the comments I saw in the Hafnium code. /* * Hafnium doesn't support fragmentation of memory retrieve requests * (because it doesn't support caller-specified mappings, so a request * will never be larger than a single page), so this must be part of a * memory send (i.e. donate, lend or share) request. * * We can tell from the handle whether the memory transaction is for the * TEE or not. */ I have a few questions about this description. 1. In the case of Hafnium as SPMC, optee should register memory fragments allocated by linux. What does Hafnium do with these memory fragments since doesn't support fragmentation of memory retrieve requests? 2. How does Hafnium map the page tables of stage-2 in dynamic shared memory for CA/TA, and are these page tables stored in the heap, or where? 3. What does HF_MAILBOX for dynamic shared memory mean? How does it relate to RX/TX buffer? Where can I see the related introduction in detail? Regards, Yuye

3 years

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Linaro OP-TEE Contribution (LOC) monthly meeting February 28

by Jens Wiklander

Hi, It's soon time for another LOC monthly meeting. For time and connection details see the calendar at https://www.trustedfirmware.org/meetings/ I have recently seen interest in OP-TEE and S-EL2. As you may know, we have a working setup with OP-TEE and Hafnium with most of the needed patches upstream. Any other topics? Thanks, Jens

3 years

2
1
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[PATCH v2] tee: optee: Add SMC for loading OP-TEE image

by Jeffrey Kardatzke

Adds an SMC call that will pass an OP-TEE binary image to EL3 and instruct it to load it as the BL32 payload. This works in conjunction with a feature added to Trusted Firmware for ARM that supports this. Signed-off-by: Jeffrey Kardatzke <jkardatzke(a)chromium.org> Signed-off-by: Jeffrey Kardatzke <jkardatzke(a)google.com> --- Changes in v2: - Fixed compile issue when feature is disabled - Addressed minor comments - Added state tracking for driver reload drivers/tee/optee/Kconfig | 10 +++++ drivers/tee/optee/optee_smc.h | 22 ++++++++++ drivers/tee/optee/smc_abi.c | 82 +++++++++++++++++++++++++++++++++++ 3 files changed, 114 insertions(+) diff --git a/drivers/tee/optee/Kconfig b/drivers/tee/optee/Kconfig index f121c224e682..f0f12b146add 100644 --- a/drivers/tee/optee/Kconfig +++ b/drivers/tee/optee/Kconfig @@ -7,3 +7,13 @@ config OPTEE help This implements the OP-TEE Trusted Execution Environment (TEE) driver. + +config OPTEE_LOAD_IMAGE + bool "Load OP-TEE image as firmware" + default n + depends on OPTEE + help + This loads the BL32 image for OP-TEE as firmware when the driver is probed. + This returns -EPROBE_DEFER until the firmware is loadable from the + filesystem which is determined by checking the system_state until it is in + SYSTEM_RUNNING. diff --git a/drivers/tee/optee/optee_smc.h b/drivers/tee/optee/optee_smc.h index 73b5e7760d10..a24c524b44fa 100644 --- a/drivers/tee/optee/optee_smc.h +++ b/drivers/tee/optee/optee_smc.h @@ -104,6 +104,28 @@ struct optee_smc_call_get_os_revision_result { unsigned long reserved1; }; +/* + * Load Trusted OS from optee/tee.bin in the Linux firmware. + * + * WARNING: Use this cautiously as it could lead to insecure loading of the + * Trusted OS. + * This SMC instructs EL3 to load a binary and execute it as the Trusted OS. + * + * Call register usage: + * a0 SMC Function ID, OPTEE_SMC_CALL_LOAD_IMAGE + * a1 Upper 32bit of a 64bit size for the payload + * a2 Lower 32bit of a 64bit size for the payload + * a3 Upper 32bit of the physical address for the payload + * a4 Lower 32bit of the physical address for the payload + * + * The payload is in the OP-TEE image format. + * + * Returns result in a0, 0 on success and an error code otherwise. + */ +#define OPTEE_SMC_FUNCID_LOAD_IMAGE 2 +#define OPTEE_SMC_CALL_LOAD_IMAGE \ + OPTEE_SMC_FAST_CALL_VAL(OPTEE_SMC_FUNCID_LOAD_IMAGE) + /* * Call with struct optee_msg_arg as argument * diff --git a/drivers/tee/optee/smc_abi.c b/drivers/tee/optee/smc_abi.c index a1c1fa1a9c28..79ddfb0f9aca 100644 --- a/drivers/tee/optee/smc_abi.c +++ b/drivers/tee/optee/smc_abi.c @@ -8,9 +8,11 @@ #include <linux/arm-smccc.h> #include <linux/errno.h> +#include <linux/firmware.h> #include <linux/interrupt.h> #include <linux/io.h> #include <linux/irqdomain.h> +#include <linux/kernel.h> #include <linux/mm.h> #include <linux/module.h> #include <linux/of.h> @@ -1354,6 +1356,82 @@ static void optee_shutdown(struct platform_device *pdev) optee_disable_shm_cache(optee); } +#ifdef CONFIG_OPTEE_LOAD_IMAGE + +#define OPTEE_FW_IMAGE "optee/tee.bin" + +static int optee_load_fw(struct platform_device *pdev, + optee_invoke_fn *invoke_fn) +{ + const struct firmware *fw = NULL; + struct arm_smccc_res res; + phys_addr_t data_pa; + u8 *data_buf = NULL; + u64 data_size; + u32 data_pa_high, data_pa_low; + u32 data_size_high, data_size_low; + static int rc; + static bool already_loaded; + + if (already_loaded) + return rc; + + rc = request_firmware(&fw, OPTEE_FW_IMAGE, &pdev->dev); + if (rc) { + /* + * The firmware in the rootfs will not be accessible until we + * are in the SYSTEM_RUNNING state, so return EPROBE_DEFER until + * that point. + */ + if (system_state < SYSTEM_RUNNING) + return -EPROBE_DEFER; + goto fw_err; + } + + data_size = fw->size; + /* + * This uses the GFP_DMA flag to ensure we are allocated memory in the + * 32-bit space since TF-A cannot map memory beyond the 32-bit boundary. + */ + data_buf = kmalloc(fw->size, GFP_KERNEL | GFP_DMA); + if (!data_buf) { + rc = -ENOMEM; + goto fw_err; + } + memcpy(data_buf, fw->data, fw->size); + data_pa = virt_to_phys(data_buf); + reg_pair_from_64(&data_pa_high, &data_pa_low, data_pa); + reg_pair_from_64(&data_size_high, &data_size_low, data_size); + goto fw_load; + +fw_err: + pr_warn("image loading failed\n"); + data_pa_high = data_pa_low = data_size_high = data_size_low = 0; + +fw_load: + /* + * Always invoke the SMC, even if loading the image fails, to indicate + * to EL3 that we have passed the point where it should allow invoking + * this SMC. + */ + invoke_fn(OPTEE_SMC_CALL_LOAD_IMAGE, data_size_high, data_size_low, + data_pa_high, data_pa_low, 0, 0, 0, &res); + if (!rc) + rc = res.a0; + if (fw) + release_firmware(fw); + kfree(data_buf); + already_loaded = true; + + return rc; +} +#else +static inline int optee_load_fw(struct platform_device *__unused1, + optee_invoke_fn *__unused2) { + return 0; +} +#endif + static int optee_probe(struct platform_device *pdev) { optee_invoke_fn *invoke_fn; @@ -1372,6 +1450,10 @@ static int optee_probe(struct platform_device *pdev) if (IS_ERR(invoke_fn)) return PTR_ERR(invoke_fn); + rc = optee_load_fw(pdev, invoke_fn); + if (rc) + return rc; + if (!optee_msg_api_uid_is_optee_api(invoke_fn)) { pr_warn("api uid mismatch\n"); return -EINVAL; -- 2.39.2.637.g21b0678d19-goog

3 years

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[PATCH] tee: optee: Add SMC for loading OP-TEE image

by Jeffrey Kardatzke

This is the kernel patch corresponding to the change landed in TF-A here: https://review.trustedfirmware.org/c/TF-A/trusted-firmware-a/+/18635 This appears to be the right place to post this, let me know if not please. From 81d97a06a48d01eb53661b41905768271f07b870 Mon Sep 17 00:00:00 2001 From: Jeffrey Kardatzke <jkardatzke(a)google.com> Date: Fri, 3 Feb 2023 11:33:17 -0800 Subject: [PATCH] tee: optee: Add SMC for loading OP-TEE image Adds an SMC call that will pass an OP-TEE binary image to EL3 and instruct it to load it as the BL32 payload. This works in conjunction with a feature added to Trusted Firmware for ARM that supports this. Signed-off-by: Jeffrey Kardatzke <jkardatzke(a)google.com> --- drivers/tee/optee/Kconfig | 9 +++++ drivers/tee/optee/optee_msg.h | 14 +++++++ drivers/tee/optee/optee_smc.h | 22 +++++++++++ drivers/tee/optee/smc_abi.c | 70 +++++++++++++++++++++++++++++++++++ 4 files changed, 115 insertions(+) diff --git a/drivers/tee/optee/Kconfig b/drivers/tee/optee/Kconfig index f121c224e682..b96b5db52b37 100644 --- a/drivers/tee/optee/Kconfig +++ b/drivers/tee/optee/Kconfig @@ -7,3 +7,12 @@ config OPTEE help This implements the OP-TEE Trusted Execution Environment (TEE) driver. + +config OPTEE_LOAD_IMAGE + bool "Load Op-Tee image as firmware" + default n + depends on OPTEE + help + This loads the BL32 image for OP-TEE as firmware when the driver is probed. + This returns -EPROBE_DEFER until the firmware is loadable from the + filesystem. diff --git a/drivers/tee/optee/optee_msg.h b/drivers/tee/optee/optee_msg.h index 70e9cc2ee96b..84c1b15032a9 100644 --- a/drivers/tee/optee/optee_msg.h +++ b/drivers/tee/optee/optee_msg.h @@ -284,6 +284,20 @@ struct optee_msg_arg { */ #define OPTEE_MSG_FUNCID_GET_OS_REVISION 0x0001 +/* + * Load Trusted OS from optee/tee.bin in the Linux firmware. + * + * WARNING: Use this cautiously as it could lead to insecure loading of the + * Trusted OS. + * This SMC instructs EL3 to load a binary and excute it as the Trusted OS. + * The first two params are the high and low 32 bits of the size of the payload + * and the third and fourth params are the high and low 32 bits of the physical + * address of the payload. The payload is in the OP-TEE image format. + * + * Returns 0 on success and an error code otherwise. + */ +#define OPTEE_MSG_FUNCID_LOAD_IMAGE 0x0002 + /* * Do a secure call with struct optee_msg_arg as argument * The OPTEE_MSG_CMD_* below defines what goes in struct optee_msg_arg::cmd diff --git a/drivers/tee/optee/optee_smc.h b/drivers/tee/optee/optee_smc.h index 73b5e7760d10..908b1005e9db 100644 --- a/drivers/tee/optee/optee_smc.h +++ b/drivers/tee/optee/optee_smc.h @@ -104,6 +104,28 @@ struct optee_smc_call_get_os_revision_result { unsigned long reserved1; }; +/* + * Load Trusted OS from optee/tee.bin in the Linux firmware. + * + * WARNING: Use this cautiously as it could lead to insecure loading of the + * Trusted OS. + * This SMC instructs EL3 to load a binary and excute it as the Trusted OS. + * + * Call register usage: + * a0 SMC Function ID, OPTEE_SMC_CALL_LOAD_IMAGE + * a1 Upper 32bit of a 64bit size for the payload + * a2 Lower 32bit of a 64bit size for the payload + * a3 Upper 32bit of the physical address for the payload + * a4 Lower 32bit of the physical address for the payload + * + * The payload is in the OP-TEE image format. + * + * Returns result in a0, 0 on success and an error code otherwise. + */ +#define OPTEE_SMC_FUNCID_LOAD_IMAGE OPTEE_MSG_FUNCID_LOAD_IMAGE +#define OPTEE_SMC_CALL_LOAD_IMAGE \ + OPTEE_SMC_FAST_CALL_VAL(OPTEE_SMC_FUNCID_LOAD_IMAGE) + /* * Call with struct optee_msg_arg as argument * diff --git a/drivers/tee/optee/smc_abi.c b/drivers/tee/optee/smc_abi.c index a1c1fa1a9c28..b1e6c4a807db 100644 --- a/drivers/tee/optee/smc_abi.c +++ b/drivers/tee/optee/smc_abi.c @@ -8,6 +8,7 @@ #include <linux/arm-smccc.h> #include <linux/errno.h> +#include <linux/firmware.h> #include <linux/interrupt.h> #include <linux/io.h> #include <linux/irqdomain.h> @@ -1354,6 +1355,69 @@ static void optee_shutdown(struct platform_device *pdev) optee_disable_shm_cache(optee); } +#ifdef CONFIG_OPTEE_LOAD_IMAGE + +#define OPTEE_FW_IMAGE "optee/tee.bin" + +static int optee_load_fw(struct platform_device *pdev, + optee_invoke_fn *invoke_fn) +{ + const struct firmware *fw = NULL; + struct arm_smccc_res res; + phys_addr_t data_pa; + u8 *data_buf = NULL; + u64 data_size; + u32 data_pa_high, data_pa_low; + u32 data_size_high, data_size_low; + int rc; + + rc = request_firmware(&fw, OPTEE_FW_IMAGE, &pdev->dev); + if (rc) + return -EPROBE_DEFER; + + data_size = fw->size; + /* + * This uses the GFP_DMA flag to ensure we are allocated memory in the + * 32-bit space since TF-A cannot map memory beyond the 32-bit boundary. + */ + data_buf = kmalloc(fw->size, GFP_KERNEL | GFP_DMA); + if (!data_buf) { + rc = -ENOMEM; + goto fw_err; + } + memcpy(data_buf, fw->data, fw->size); + data_pa = virt_to_phys(data_buf); + reg_pair_from_64(&data_pa_high, &data_pa_low, data_pa); + reg_pair_from_64(&data_size_high, &data_size_low, data_size); + goto fw_load; + +fw_err: + pr_warn("image loading failed\n"); + data_pa_high = data_pa_low = data_size_high = data_size_low = 0; + +fw_load: + /* + * Always invoke the SMC, even if loading the image fails, to indicate + * to EL3 that we have passed the point where it should allow invoking + * this SMC. + */ + invoke_fn(OPTEE_SMC_CALL_LOAD_IMAGE, data_size_high, data_size_low, + data_pa_high, data_pa_low, 0, 0, 0, &res); + if (!rc) + rc = res.a0; + if (fw) + release_firmware(fw); + kfree(data_buf); + + return rc; +} +#else +static inline int optee_load_fw(struct platform_device *__unused, + optee_invoke_fn *__unused) { + return 0; +} +#endif + static int optee_probe(struct platform_device *pdev) { optee_invoke_fn *invoke_fn; @@ -1372,6 +1436,12 @@ static int optee_probe(struct platform_device *pdev) if (IS_ERR(invoke_fn)) return PTR_ERR(invoke_fn); + rc = optee_load_fw(pdev, invoke_fn); + if (rc) { + pr_warn("image loading failed\n"); + return rc; + } + if (!optee_msg_api_uid_is_optee_api(invoke_fn)) { pr_warn("api uid mismatch\n"); return -EINVAL; -- 2.39.1.519.gcb327c4b5f-goog

3 years

2
4
0 0

[PATCH v3 1/2] tee: system invocation

by Etienne Carriere

Adds TEE system invocation context provisioning for a Linux driver to provision execution contexts for invocation of system service hosted in TEE. OP-TEE SMC ABI implements such invocation context provisioning. This feature is needed when a TEE invocation cannot afford to wait for a free TEE thread when all TEE threads context are used and suspended as these may be suspended waiting for a system service, as an SCMI clock or voltage regulator, to be enabled. An example is when OP-TEE invokes a Linux OS remote service (RPC) to access an eMMC RPMB partition and the eMMC device is supplied by an OP-TEE SCMI regulator. Signed-off-by: Etienne Carriere <etienne.carriere(a)linaro.org> --- No change since v2 Change since v1 - Addressed comment on Linux client to claim reservation on TEE context. This brings 2 new operations from client to TEE to request and release system thread contexts: 2 new tee_drv.h API functions, 2 new ops functions in struct tee_driver_ops. The OP-TEE implement shall implement 2 new fastcall SMC funcIDs. - Fixed typos in commit message. --- drivers/tee/optee/optee_smc.h | 60 +++++++++++++++++++++++++++++++++-- drivers/tee/optee/smc_abi.c | 34 +++++++++++++++++++- drivers/tee/tee_core.c | 30 ++++++++++++++++++ include/linux/tee_drv.h | 21 ++++++++++++ 4 files changed, 141 insertions(+), 4 deletions(-) diff --git a/drivers/tee/optee/optee_smc.h b/drivers/tee/optee/optee_smc.h index 73b5e7760d10..75b19e1bd185 100644 --- a/drivers/tee/optee/optee_smc.h +++ b/drivers/tee/optee/optee_smc.h @@ -108,7 +108,8 @@ struct optee_smc_call_get_os_revision_result { * Call with struct optee_msg_arg as argument * * When called with OPTEE_SMC_CALL_WITH_RPC_ARG or - * OPTEE_SMC_CALL_WITH_REGD_ARG in a0 there is one RPC struct optee_msg_arg + * OPTEE_SMC_CALL_WITH_REGD_ARG or OPTEE_SMC_FUNCID_CALL_SYSTEM_WITH_REGD_ARG + * in a0 there is one RPC struct optee_msg_arg * following after the first struct optee_msg_arg. The RPC struct * optee_msg_arg has reserved space for the number of RPC parameters as * returned by OPTEE_SMC_EXCHANGE_CAPABILITIES. @@ -130,8 +131,8 @@ struct optee_smc_call_get_os_revision_result { * a4-6 Not used * a7 Hypervisor Client ID register * - * Call register usage, OPTEE_SMC_CALL_WITH_REGD_ARG: - * a0 SMC Function ID, OPTEE_SMC_CALL_WITH_REGD_ARG + * Call register usage, OPTEE_SMC_CALL_WITH_REGD_ARG and OPTEE_SMC_FUNCID_CALL_SYSTEM_WITH_REGD_ARG: + * a0 SMC Function ID, OPTEE_SMC_CALL_WITH_REGD_ARG or OPTEE_SMC_FUNCID_CALL_SYSTEM_WITH_REGD_ARG * a1 Upper 32 bits of a 64-bit shared memory cookie * a2 Lower 32 bits of a 64-bit shared memory cookie * a3 Offset of the struct optee_msg_arg in the shared memory with the @@ -175,6 +176,8 @@ struct optee_smc_call_get_os_revision_result { OPTEE_SMC_STD_CALL_VAL(OPTEE_SMC_FUNCID_CALL_WITH_RPC_ARG) #define OPTEE_SMC_CALL_WITH_REGD_ARG \ OPTEE_SMC_STD_CALL_VAL(OPTEE_SMC_FUNCID_CALL_WITH_REGD_ARG) +#define OPTEE_SMC_CALL_SYSTEM_WITH_REGD_ARG \ + OPTEE_SMC_STD_CALL_VAL(OPTEE_SMC_FUNCID_CALL_SYSTEM_WITH_REGD_ARG) /* * Get Shared Memory Config @@ -254,6 +257,8 @@ struct optee_smc_get_shm_config_result { #define OPTEE_SMC_SEC_CAP_ASYNC_NOTIF BIT(5) /* Secure world supports pre-allocating RPC arg struct */ #define OPTEE_SMC_SEC_CAP_RPC_ARG BIT(6) +/* Secure world provisions thread for system service invocation */ +#define OPTEE_SMC_SEC_CAP_SYSTEM_THREAD BIT(7) #define OPTEE_SMC_FUNCID_EXCHANGE_CAPABILITIES 9 #define OPTEE_SMC_EXCHANGE_CAPABILITIES \ @@ -426,6 +431,55 @@ struct optee_smc_disable_shm_cache_result { /* See OPTEE_SMC_CALL_WITH_REGD_ARG above */ #define OPTEE_SMC_FUNCID_CALL_WITH_REGD_ARG 19 +/* See OPTEE_SMC_CALL_SYSTEM_WITH_REGD_ARG above */ +#define OPTEE_SMC_FUNCID_CALL_SYSTEM_WITH_REGD_ARG 20 + +/* + * Request reservation of a system invocation thread context in OP-TEE + * + * Call register usage: + * a0 SMC Function ID: OPTEE_SMC_CALL_RESERVE_SYS_THREAD + * a1-6 Not used + * a7 Hypervisor Client ID register + * + * Normal return register usage: + * a0 Return value, OPTEE_SMC_RETURN_* + * a1-3 Not used + * a4-7 Preserved + * + * Possible return values: + * OPTEE_SMC_RETURN_UNKNOWN_FUNCTION Trusted OS does not recognize this + * function. + * OPTEE_SMC_RETURN_OK Call successfully completed. + * OPTEE_SMC_RETURN_ETHREAD_LIMIT Number of Trusted OS threads exceeded + * for the request. + */ +#define OPTEE_SMC_FUNCID_CALL_RESERVE_SYS_THREAD 21 +#define OPTEE_SMC_CALL_RESERVE_SYS_THREAD \ + OPTEE_SMC_STD_CALL_VAL(OPTEE_SMC_FUNCID_CALL_RESERVE_SYS_THREAD) + +/* + * Unregister reservation of a system invocation thread context in OP-TEE + * + * Call register usage: + * a0 SMC Function ID: OPTEE_SMC_CALL_UNRESERVE_SYS_THREAD + * a1-6 Not used + * a7 Hypervisor Client ID register + * + * Normal return register usage: + * a0 Return value, OPTEE_SMC_RETURN_* + * a1-3 Not used + * a4-7 Preserved + * + * Possible return values: + * OPTEE_SMC_RETURN_UNKNOWN_FUNCTION Trusted OS does not recognize this + * function. + * OPTEE_SMC_RETURN_OK Call successfully completed. + */ +#define OPTEE_SMC_FUNCID_CALL_UNRESERVE_SYS_THREAD 22 +#define OPTEE_SMC_CALL_UNRESERVE_SYS_THREAD \ + OPTEE_SMC_STD_CALL_VAL(OPTEE_SMC_FUNCID_CALL_UNRESERVE_SYS_THREAD) + /* * Resume from RPC (for example after processing a foreign interrupt) * diff --git a/drivers/tee/optee/smc_abi.c b/drivers/tee/optee/smc_abi.c index a1c1fa1a9c28..013b5ae31c0e 100644 --- a/drivers/tee/optee/smc_abi.c +++ b/drivers/tee/optee/smc_abi.c @@ -889,7 +889,10 @@ static int optee_smc_do_call_with_arg(struct tee_context *ctx, } if (rpc_arg && tee_shm_is_dynamic(shm)) { - param.a0 = OPTEE_SMC_CALL_WITH_REGD_ARG; + if (ctx->system_ctx_count) + param.a0 = OPTEE_SMC_CALL_SYSTEM_WITH_REGD_ARG; + else + param.a0 = OPTEE_SMC_CALL_WITH_REGD_ARG; reg_pair_from_64(&param.a1, &param.a2, (u_long)shm); param.a3 = offs; } else { @@ -1085,6 +1088,33 @@ static int optee_smc_open(struct tee_context *ctx) return optee_open(ctx, sec_caps & OPTEE_SMC_SEC_CAP_MEMREF_NULL); } +static int optee_request_sys_ctx(struct tee_context *ctx) +{ + struct optee *optee = tee_get_drvdata(ctx->teedev); + struct arm_smccc_res res; + + if (!(optee->smc.sec_caps & OPTEE_SMC_SEC_CAP_SYSTEM_THREAD)) + return -EINVAL; + + optee->smc.invoke_fn(OPTEE_SMC_CALL_RESERVE_SYS_THREAD, + 0, 0, 0, 0, 0, 0, 0, &res); + + if (res.a0 != OPTEE_SMC_RETURN_OK) + return -EINVAL; + + return 0; +} + +static void optee_release_sys_ctx(struct tee_context *ctx) +{ + struct optee *optee = tee_get_drvdata(ctx->teedev); + struct arm_smccc_res res; + + if (optee->smc.sec_caps & OPTEE_SMC_SEC_CAP_SYSTEM_THREAD) + optee->smc.invoke_fn(OPTEE_SMC_CALL_UNRESERVE_SYS_THREAD, + 0, 0, 0, 0, 0, 0, 0, &res); +} + static const struct tee_driver_ops optee_clnt_ops = { .get_version = optee_get_version, .open = optee_smc_open, @@ -1095,6 +1125,8 @@ static const struct tee_driver_ops optee_clnt_ops = { .cancel_req = optee_cancel_req, .shm_register = optee_shm_register, .shm_unregister = optee_shm_unregister, + .system_ctx_request = optee_request_sys_ctx, + .system_ctx_release = optee_release_sys_ctx, }; static const struct tee_desc optee_clnt_desc = { diff --git a/drivers/tee/tee_core.c b/drivers/tee/tee_core.c index 98da206cd761..a7dfdea5d85b 100644 --- a/drivers/tee/tee_core.c +++ b/drivers/tee/tee_core.c @@ -5,6 +5,7 @@ #define pr_fmt(fmt) "%s: " fmt, __func__ +#include <linux/bug.h> #include <linux/cdev.h> #include <linux/cred.h> #include <linux/fs.h> @@ -1141,10 +1142,39 @@ EXPORT_SYMBOL_GPL(tee_client_open_context); void tee_client_close_context(struct tee_context *ctx) { + while (ctx->system_ctx_count) + tee_client_release_system_context(ctx); + teedev_close_context(ctx); } EXPORT_SYMBOL_GPL(tee_client_close_context); +int tee_client_request_system_context(struct tee_context *ctx) +{ + int ret; + + if (!ctx->teedev->desc->ops->system_ctx_request || + !ctx->teedev->desc->ops->system_ctx_release) + return -EINVAL; + + ret = ctx->teedev->desc->ops->system_ctx_request(ctx); + if (!ret) + ctx->system_ctx_count++; + + return ret; +} +EXPORT_SYMBOL_GPL(tee_client_request_system_context); + +void tee_client_release_system_context(struct tee_context *ctx) +{ + if (ctx->system_ctx_count && + ctx->teedev->desc->ops->system_ctx_release) { + ctx->teedev->desc->ops->system_ctx_release(ctx); + ctx->system_ctx_count--; + } +} +EXPORT_SYMBOL_GPL(tee_client_release_system_context); + void tee_client_get_version(struct tee_context *ctx, struct tee_ioctl_version_data *vers) { diff --git a/include/linux/tee_drv.h b/include/linux/tee_drv.h index 17eb1c5205d3..45577256bb71 100644 --- a/include/linux/tee_drv.h +++ b/include/linux/tee_drv.h @@ -47,6 +47,8 @@ struct tee_shm_pool; * non-blocking in nature. * @cap_memref_null: flag indicating if the TEE Client support shared * memory buffer with a NULL pointer. + * @system_ctx_count: Number of system invocation contexts provisioned for + * this TEE client or 0. */ struct tee_context { struct tee_device *teedev; @@ -55,6 +57,7 @@ struct tee_context { bool releasing; bool supp_nowait; bool cap_memref_null; + unsigned int system_ctx_count; }; struct tee_param_memref { @@ -90,6 +93,8 @@ struct tee_param { * @supp_send: called for supplicant to send a response * @shm_register: register shared memory buffer in TEE * @shm_unregister: unregister shared memory buffer in TEE + * @system_ctx_request: Request provisioning of a new system context in TEE + * @system_ctx_release: Release a provisioned system context in TEE */ struct tee_driver_ops { void (*get_version)(struct tee_device *teedev, @@ -112,6 +117,8 @@ struct tee_driver_ops { struct page **pages, size_t num_pages, unsigned long start); int (*shm_unregister)(struct tee_context *ctx, struct tee_shm *shm); + int (*system_ctx_request)(struct tee_context *ctx); + void (*system_ctx_release)(struct tee_context *ctx); }; /** @@ -397,6 +404,20 @@ tee_client_open_context(struct tee_context *start, */ void tee_client_close_context(struct tee_context *ctx); +/** + * tee_client_request_system_context() - Close a TEE context + * @ctx: TEE context to close + * + * @return 0 on success else an error code + */ +int tee_client_request_system_context(struct tee_context *ctx); + +/** + * tee_client_release_system_context() - Release a reserved system exec context + * @ctx: TEE context reference + */ +void tee_client_release_system_context(struct tee_context *ctx); + /** * tee_client_get_version() - Query version of TEE * @ctx: TEE context to TEE to query -- 2.25.1

3 years

2
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[GIT PULL] Remove get_kernel_pages() for v6.3

by Jens Wiklander

Hi Linus, Please pull these patches which clean up shm_get_kernel_pages() in the TEE subsystem and ultimately remove get_kernel_pages(). The patches have only been in linux-next for close to a week but you told me it was OK to send them anyway. I'm normally sending my pull requests to arm-soc, but with the short time in linux-next and everything I decided to send it directly to you this time. Thanks, Jens The following changes since commit ceaa837f96adb69c0df0397937cd74991d5d821a: Linux 6.2-rc8 (2023-02-12 14:10:17 -0800) are available in the Git repository at: https://git.linaro.org/people/jens.wiklander/linux-tee.git tags/remove-get_kernel_pages-for-6.3 for you to fetch changes up to 816477edfba6e7ab9411acec5f07cfa00e0882f7: mm: Remove get_kernel_pages() (2023-02-13 14:16:41 +0100) ---------------------------------------------------------------- Remove get_kernel_pages() Vmalloc page support is removed from shm_get_kernel_pages() and the get_kernel_pages() call is replaced by calls to get_page(). With no remaining callers of get_kernel_pages() the function is removed. ---------------------------------------------------------------- Ira Weiny (4): highmem: Enhance is_kmap_addr() to check kmap_local_page() mappings tee: Remove vmalloc page support tee: Remove call to get_kernel_pages() mm: Remove get_kernel_pages() drivers/tee/tee_shm.c | 37 ++++++++++--------------------------- include/linux/highmem-internal.h | 5 ++++- include/linux/mm.h | 2 -- mm/swap.c | 30 ------------------------------ 4 files changed, 14 insertions(+), 60 deletions(-)

3 years, 1 month

2
1
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[PATCH v2 0/4] introduce tee-based EFI Runtime Variable Service

by Masahisa Kojima

This series introduces the tee based EFI Runtime Variable Service. This version moves StMM related code from drivers/tee/optee to drivers/firmware/efi/stmm, since StMM code does not contain OP-TEE specific code and can be used with other TEE implementation. 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 OP-TEE, 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 OP-TEE and StandaloneMM. Changelog: rfc v1 -> v2: - split patch into three patches, one for drivers/tee, one for include/linux/efi.h, and one for the driver/firmware/efi/stmm - context/session management into probe() and remove() same as other tee client driver - StMM variable driver is moved from driver/tee/optee to driver/firmware/efi - use "tee" prefix instead of "optee" in driver/firmware/efi/stmm/tee_stmm_efi.c, this file does not contain op-tee specific code, abstracted by tee layer and StMM variable driver will work on other tee implementation. - PTA_STMM_CMD_COMMUNICATE -> PTA_STMM_CMD_COMMUNICATE - implement query_variable_store() but currently not used - no use of TEEC_SUCCESS, it is defined in driver/tee/optee/optee_private.h. Other tee client drivers use 0 instead of using TEEC_SUCCESS - remove TEEC_ERROR_EXCESS_DATA status, it is refered just to output error message Masahisa Kojima (4): efi: expose efivar generic ops register function efi: Add EFI_ACCESS_DENIED status code tee: expose tee efivar register function efi: Add tee-based EFI variable driver drivers/firmware/efi/Kconfig | 15 + drivers/firmware/efi/Makefile | 1 + drivers/firmware/efi/efi.c | 12 + drivers/firmware/efi/stmm/mm_communication.h | 249 ++++++++ drivers/firmware/efi/stmm/tee_stmm_efi.c | 620 +++++++++++++++++++ drivers/tee/tee_core.c | 23 + include/linux/efi.h | 4 + include/linux/tee_drv.h | 23 + 8 files changed, 947 insertions(+) create mode 100644 drivers/firmware/efi/stmm/mm_communication.h create mode 100644 drivers/firmware/efi/stmm/tee_stmm_efi.c -- 2.30.2

3 years, 1 month

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