From 57f72170a2b2a362c35bb9407fc844eac5afdec1 Mon Sep 17 00:00:00 2001 From: Sibi Sankar Date: Tue, 17 Jan 2023 14:28:35 +0530 Subject: [PATCH] remoteproc: qcom_q6v5_mss: Use a carveout to authenticate modem headers Any access to the dynamically allocated metadata region by the application processor after assigning it to the remote Q6 will result in a XPU violation. Fix this by replacing the dynamically allocated memory region with a no-map carveout and unmap the modem metadata memory region before passing control to the remote Q6. Reported-and-tested-by: Amit Pundir Fixes: 6c5a9dc2481b ("remoteproc: qcom: Make secure world call for mem ownership switch") Signed-off-by: Sibi Sankar Reviewed-by: Manivannan Sadhasivam Signed-off-by: Bjorn Andersson Link: https://lore.kernel.org/r/20230117085840.32356-7-quic_sibis@quicinc.com --- drivers/remoteproc/qcom_q6v5_mss.c | 59 ++++++++++++++++++++++++++++++++++---- 1 file changed, 53 insertions(+), 6 deletions(-) diff --git a/drivers/remoteproc/qcom_q6v5_mss.c b/drivers/remoteproc/qcom_q6v5_mss.c index e2f765f..292e22f 100644 --- a/drivers/remoteproc/qcom_q6v5_mss.c +++ b/drivers/remoteproc/qcom_q6v5_mss.c @@ -17,6 +17,7 @@ #include #include #include +#include #include #include #include @@ -215,6 +216,9 @@ struct q6v5 { size_t mba_size; size_t dp_size; + phys_addr_t mdata_phys; + size_t mdata_size; + phys_addr_t mpss_phys; phys_addr_t mpss_reloc; size_t mpss_size; @@ -973,15 +977,35 @@ static int q6v5_mpss_init_image(struct q6v5 *qproc, const struct firmware *fw, if (IS_ERR(metadata)) return PTR_ERR(metadata); - ptr = dma_alloc_attrs(qproc->dev, size, &phys, GFP_KERNEL, dma_attrs); - if (!ptr) { - kfree(metadata); - dev_err(qproc->dev, "failed to allocate mdt buffer\n"); - return -ENOMEM; + if (qproc->mdata_phys) { + if (size > qproc->mdata_size) { + ret = -EINVAL; + dev_err(qproc->dev, "metadata size outside memory range\n"); + goto free_metadata; + } + + phys = qproc->mdata_phys; + ptr = memremap(qproc->mdata_phys, size, MEMREMAP_WC); + if (!ptr) { + ret = -EBUSY; + dev_err(qproc->dev, "unable to map memory region: %pa+%zx\n", + &qproc->mdata_phys, size); + goto free_metadata; + } + } else { + ptr = dma_alloc_attrs(qproc->dev, size, &phys, GFP_KERNEL, dma_attrs); + if (!ptr) { + ret = -ENOMEM; + dev_err(qproc->dev, "failed to allocate mdt buffer\n"); + goto free_metadata; + } } memcpy(ptr, metadata, size); + if (qproc->mdata_phys) + memunmap(ptr); + /* Hypervisor mapping to access metadata by modem */ mdata_perm = BIT(QCOM_SCM_VMID_HLOS); ret = q6v5_xfer_mem_ownership(qproc, &mdata_perm, false, true, @@ -1010,7 +1034,9 @@ static int q6v5_mpss_init_image(struct q6v5 *qproc, const struct firmware *fw, "mdt buffer not reclaimed system may become unstable\n"); free_dma_attrs: - dma_free_attrs(qproc->dev, size, ptr, phys, dma_attrs); + if (!qproc->mdata_phys) + dma_free_attrs(qproc->dev, size, ptr, phys, dma_attrs); +free_metadata: kfree(metadata); return ret < 0 ? ret : 0; @@ -1847,6 +1873,7 @@ static int q6v5_init_reset(struct q6v5 *qproc) static int q6v5_alloc_memory_region(struct q6v5 *qproc) { struct device_node *child; + struct reserved_mem *rmem; struct device_node *node; struct resource r; int ret; @@ -1893,6 +1920,26 @@ static int q6v5_alloc_memory_region(struct q6v5 *qproc) qproc->mpss_phys = qproc->mpss_reloc = r.start; qproc->mpss_size = resource_size(&r); + if (!child) { + node = of_parse_phandle(qproc->dev->of_node, "memory-region", 2); + } else { + child = of_get_child_by_name(qproc->dev->of_node, "metadata"); + node = of_parse_phandle(child, "memory-region", 0); + of_node_put(child); + } + + if (!node) + return 0; + + rmem = of_reserved_mem_lookup(node); + if (!rmem) { + dev_err(qproc->dev, "unable to resolve metadata region\n"); + return -EINVAL; + } + + qproc->mdata_phys = rmem->base; + qproc->mdata_size = rmem->size; + return 0; } -- 2.7.4