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SubjectRe: [PATCH v2] amdgpu: validate drm_amdgpu_gem_va addrs
From
Am 24.05.23 um 00:53 schrieb Chia-I Wu:
> Validate drm_amdgpu_gem_va addrs in amdgpu_gem_va_ioctl.
> amdgpu_vm_bo_replace_map no longer needs to validate (and its
> validations were insufficient either). amdgpu_vm_bo_map has internal
> users and its validations are kept.

No, please keep all validation inside amdgpu_vm.c code.

See the offset is unused or might have a different meaning for some use
cases, so validating it here is actually not correct.

Christian.

>
> This is motivated by OOB access in amdgpu_vm_update_range when
> offset_in_bo+map_size overflows.
>
> Userspace (radeonsi and radv) seems fine as well.
>
> v2: keep the validations in amdgpu_vm_bo_map
>
> Fixes: 9f7eb5367d00 ("drm/amdgpu: actually use the VM map parameters")
> Signed-off-by: Chia-I Wu <olvaffe@gmail.com>
> ---
> drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c | 15 +++++++++++++++
> drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c | 8 +-------
> 2 files changed, 16 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c
> index d8e683688daab..36d5adfdf0f69 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c
> @@ -681,6 +681,21 @@ 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 ||
> + args->va_address + args->map_size < args->va_address ||
> + args->offset_in_bo + args->map_size < args->offset_in_bo) {
> + dev_dbg(dev->dev, "invalid map_size 0x%LX (va_address 0x%LX, offset_in_bo 0x%LX)\n",
> + args->map_size, args->va_address, args->offset_in_bo);
> + 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..6307baaa136cf 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
> @@ -1501,15 +1501,9 @@ 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 ||
> - (bo && offset + size > amdgpu_bo_size(bo)) ||
> + if ((bo && offset + size > amdgpu_bo_size(bo)) ||
> (eaddr >= adev->vm_manager.max_pfn << AMDGPU_GPU_PAGE_SHIFT))
> return -EINVAL;
>

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