From c745cd1718b7825d69315fe7127e2e289e617598 Mon Sep 17 00:00:00 2001 From: Sumit Garg Date: Tue, 22 Aug 2023 16:59:33 +0530 Subject: KEYS: trusted: tee: Refactor register SHM usage The OP-TEE driver using the old SMC based ABI permits overlapping shared buffers, but with the new FF-A based ABI each physical page may only be registered once. As the key and blob buffer are allocated adjancently, there is no need for redundant register shared memory invocation. Also, it is incompatibile with FF-A based ABI limitation. So refactor register shared memory implementation to use only single invocation to register both key and blob buffers. [jarkko: Added cc to stable.] Cc: stable@vger.kernel.org # v5.16+ Fixes: 4615e5a34b95 ("optee: add FF-A support") Reported-by: Jens Wiklander Signed-off-by: Sumit Garg Tested-by: Jens Wiklander Reviewed-by: Jens Wiklander Signed-off-by: Jarkko Sakkinen --- security/keys/trusted-keys/trusted_tee.c | 64 ++++++++++---------------------- 1 file changed, 20 insertions(+), 44 deletions(-) diff --git a/security/keys/trusted-keys/trusted_tee.c b/security/keys/trusted-keys/trusted_tee.c index ac3e270ade69..aa3d477de6db 100644 --- a/security/keys/trusted-keys/trusted_tee.c +++ b/security/keys/trusted-keys/trusted_tee.c @@ -65,24 +65,16 @@ static int trusted_tee_seal(struct trusted_key_payload *p, char *datablob) int ret; struct tee_ioctl_invoke_arg inv_arg; struct tee_param param[4]; - struct tee_shm *reg_shm_in = NULL, *reg_shm_out = NULL; + struct tee_shm *reg_shm = NULL; memset(&inv_arg, 0, sizeof(inv_arg)); memset(¶m, 0, sizeof(param)); - reg_shm_in = tee_shm_register_kernel_buf(pvt_data.ctx, p->key, - p->key_len); - if (IS_ERR(reg_shm_in)) { - dev_err(pvt_data.dev, "key shm register failed\n"); - return PTR_ERR(reg_shm_in); - } - - reg_shm_out = tee_shm_register_kernel_buf(pvt_data.ctx, p->blob, - sizeof(p->blob)); - if (IS_ERR(reg_shm_out)) { - dev_err(pvt_data.dev, "blob shm register failed\n"); - ret = PTR_ERR(reg_shm_out); - goto out; + reg_shm = tee_shm_register_kernel_buf(pvt_data.ctx, p->key, + sizeof(p->key) + sizeof(p->blob)); + if (IS_ERR(reg_shm)) { + dev_err(pvt_data.dev, "shm register failed\n"); + return PTR_ERR(reg_shm); } inv_arg.func = TA_CMD_SEAL; @@ -90,13 +82,13 @@ static int trusted_tee_seal(struct trusted_key_payload *p, char *datablob) inv_arg.num_params = 4; param[0].attr = TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INPUT; - param[0].u.memref.shm = reg_shm_in; + param[0].u.memref.shm = reg_shm; param[0].u.memref.size = p->key_len; param[0].u.memref.shm_offs = 0; param[1].attr = TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_OUTPUT; - param[1].u.memref.shm = reg_shm_out; + param[1].u.memref.shm = reg_shm; param[1].u.memref.size = sizeof(p->blob); - param[1].u.memref.shm_offs = 0; + param[1].u.memref.shm_offs = sizeof(p->key); ret = tee_client_invoke_func(pvt_data.ctx, &inv_arg, param); if ((ret < 0) || (inv_arg.ret != 0)) { @@ -107,11 +99,7 @@ static int trusted_tee_seal(struct trusted_key_payload *p, char *datablob) p->blob_len = param[1].u.memref.size; } -out: - if (reg_shm_out) - tee_shm_free(reg_shm_out); - if (reg_shm_in) - tee_shm_free(reg_shm_in); + tee_shm_free(reg_shm); return ret; } @@ -124,24 +112,16 @@ static int trusted_tee_unseal(struct trusted_key_payload *p, char *datablob) int ret; struct tee_ioctl_invoke_arg inv_arg; struct tee_param param[4]; - struct tee_shm *reg_shm_in = NULL, *reg_shm_out = NULL; + struct tee_shm *reg_shm = NULL; memset(&inv_arg, 0, sizeof(inv_arg)); memset(¶m, 0, sizeof(param)); - reg_shm_in = tee_shm_register_kernel_buf(pvt_data.ctx, p->blob, - p->blob_len); - if (IS_ERR(reg_shm_in)) { - dev_err(pvt_data.dev, "blob shm register failed\n"); - return PTR_ERR(reg_shm_in); - } - - reg_shm_out = tee_shm_register_kernel_buf(pvt_data.ctx, p->key, - sizeof(p->key)); - if (IS_ERR(reg_shm_out)) { - dev_err(pvt_data.dev, "key shm register failed\n"); - ret = PTR_ERR(reg_shm_out); - goto out; + reg_shm = tee_shm_register_kernel_buf(pvt_data.ctx, p->key, + sizeof(p->key) + sizeof(p->blob)); + if (IS_ERR(reg_shm)) { + dev_err(pvt_data.dev, "shm register failed\n"); + return PTR_ERR(reg_shm); } inv_arg.func = TA_CMD_UNSEAL; @@ -149,11 +129,11 @@ static int trusted_tee_unseal(struct trusted_key_payload *p, char *datablob) inv_arg.num_params = 4; param[0].attr = TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INPUT; - param[0].u.memref.shm = reg_shm_in; + param[0].u.memref.shm = reg_shm; param[0].u.memref.size = p->blob_len; - param[0].u.memref.shm_offs = 0; + param[0].u.memref.shm_offs = sizeof(p->key); param[1].attr = TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_OUTPUT; - param[1].u.memref.shm = reg_shm_out; + param[1].u.memref.shm = reg_shm; param[1].u.memref.size = sizeof(p->key); param[1].u.memref.shm_offs = 0; @@ -166,11 +146,7 @@ static int trusted_tee_unseal(struct trusted_key_payload *p, char *datablob) p->key_len = param[1].u.memref.size; } -out: - if (reg_shm_out) - tee_shm_free(reg_shm_out); - if (reg_shm_in) - tee_shm_free(reg_shm_in); + tee_shm_free(reg_shm); return ret; } -- cgit v1.2.3