linux-kernel - [PATCH 1/2] amdgpu: validate drm_amdgpu_gem

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Message-ID: <20230509183301.1745462-1-olvaffe@gmail.com>
Date:   Tue,  9 May 2023 11:32:54 -0700
From:   Chia-I Wu <olvaffe@...il.com>
To:     dri-devel@...ts.freedesktop.org
Cc:     Alex Deucher <alexander.deucher@....com>,
        Christian König <christian.koenig@....com>,
        "Pan, Xinhui" <Xinhui.Pan@....com>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Felix Kuehling <Felix.Kuehling@....com>,
        Marek Olšák <marek.olsak@....com>,
        Arunpravin Paneer Selvam <Arunpravin.PaneerSelvam@....com>,
        Suren Baghdasaryan <surenb@...gle.com>,
        Kefeng Wang <wangkefeng.wang@...wei.com>,
        Yang Li <yang.lee@...ux.alibaba.com>,
        Philip Yang <Philip.Yang@....com>,
        Luben Tuikov <luben.tuikov@....com>,
        Danijel Slivka <danijel.slivka@....com>,
        Mukul Joshi <mukul.joshi@....com>,
        amd-gfx@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: [PATCH 1/2] amdgpu: validate drm_amdgpu_gem_va addrs for all ops

Extend the address and size validations to AMDGPU_VA_OP_UNMAP and
AMDGPU_VA_OP_CLEAR by moving the validations to amdgpu_gem_va_ioctl.

Internal users of amdgpu_vm_bo_map are no longer validated but they
should be fine.

Userspace (radeonsi and radv) seems fine as well.
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c | 12 ++++++++++++
 drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c  | 10 ----------
 2 files changed, 12 insertions(+), 10 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c
index d8e683688daab..071f6565cf971 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c
@@ -681,6 +681,18 @@ int amdgpu_gem_va_ioctl(struct drm_device *dev, void *data,
 	uint64_t vm_size;
 	int r = 0;
 
+	if (args->va_address & ~PAGE_MASK || args->offset_in_bo & ~PAGE_MASK ||
+	    args->map_size & ~PAGE_MASK) {
+		dev_dbg(dev->dev, "unaligned va_address 0x%LX, offset_in_bo 0x%LX, or map_size 0x%LX\n",
+			args->va_address, args->offset_in_bo, args->map_size);
+		return -EINVAL;
+	}
+
+	if (args->map_size == 0) {
+		dev_dbg(dev->dev, "invalid map_size 0x%LX\n", args->map_size);
+		return -EINVAL;
+	}
+
 	if (args->va_address < AMDGPU_VA_RESERVED_SIZE) {
 		dev_dbg(dev->dev,
 			"va_address 0x%LX is in reserved area 0x%LX\n",
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
index b9441ab457ea7..fa5819d581655 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
@@ -1435,11 +1435,6 @@ int amdgpu_vm_bo_map(struct amdgpu_device *adev,
 	struct amdgpu_vm *vm = bo_va->base.vm;
 	uint64_t eaddr;
 
-	/* validate the parameters */
-	if (saddr & ~PAGE_MASK || offset & ~PAGE_MASK ||
-	    size == 0 || size & ~PAGE_MASK)
-		return -EINVAL;
-
 	/* make sure object fit at this offset */
 	eaddr = saddr + size - 1;
 	if (saddr >= eaddr ||
@@ -1501,11 +1496,6 @@ int amdgpu_vm_bo_replace_map(struct amdgpu_device *adev,
 	uint64_t eaddr;
 	int r;
 
-	/* validate the parameters */
-	if (saddr & ~PAGE_MASK || offset & ~PAGE_MASK ||
-	    size == 0 || size & ~PAGE_MASK)
-		return -EINVAL;
-
 	/* make sure object fit at this offset */
 	eaddr = saddr + size - 1;
 	if (saddr >= eaddr ||
-- 
2.40.1.521.gf1e218fcd8-goog