From aecadd7140eff321005c8da286bf66c1fa235024 Mon Sep 17 00:00:00 2001 From: Liam Mark Date: Mon, 15 May 2017 10:50:23 -0700 Subject: iommu: iommu-debug: limit memory address exposure Update pte and dma atos debugfs nodes to be inline with other iommu debugfs nodes and only expose memory addresses when kptr_restrict is disabled. Change-Id: I46d5de498b811b4874be570aea7b41461b9a1a98 Signed-off-by: Liam Mark --- drivers/iommu/iommu-debug.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/drivers/iommu/iommu-debug.c b/drivers/iommu/iommu-debug.c index b8155c9227d3..c21846c1f8d5 100644 --- a/drivers/iommu/iommu-debug.c +++ b/drivers/iommu/iommu-debug.c @@ -1491,6 +1491,10 @@ static ssize_t iommu_debug_pte_read(struct file *file, char __user *ubuf, ssize_t retval; size_t buflen; + if (kptr_restrict != 0) { + pr_err("kptr_restrict needs to be disabled.\n"); + return -EPERM; + } if (!dev->archdata.mapping) { pr_err("No mapping. Did you already attach?\n"); return -EINVAL; @@ -1610,6 +1614,10 @@ static ssize_t iommu_debug_dma_atos_read(struct file *file, char __user *ubuf, ssize_t retval; size_t buflen; + if (kptr_restrict != 0) { + pr_err("kptr_restrict needs to be disabled.\n"); + return -EPERM; + } if (!dev->archdata.mapping) { pr_err("No mapping. Did you already attach?\n"); return -EINVAL; -- cgit v1.2.3