linux-kernel - Re: [PATCH v3] amdgpu: validate offset_in_bo of drm_amdgpu_gem

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Date:   Fri, 2 Jun 2023 13:43:40 +0200
From:   Christian König <christian.koenig@....com>
To:     Chia-I Wu <olvaffe@...il.com>, dri-devel@...ts.freedesktop.org
Cc:     Alex Deucher <alexander.deucher@....com>,
        "Pan, Xinhui" <Xinhui.Pan@....com>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Felix Kuehling <Felix.Kuehling@....com>,
        Philip Yang <Philip.Yang@....com>,
        Hawking Zhang <Hawking.Zhang@....com>,
        Mukul Joshi <mukul.joshi@....com>,
        Danijel Slivka <danijel.slivka@....com>,
        Lang Yu <Lang.Yu@....com>,
        Marek Olšák <marek.olsak@....com>,
        Jammy Zhou <Jammy.Zhou@....com>, amd-gfx@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] amdgpu: validate offset_in_bo of drm_amdgpu_gem_va

Am 02.06.23 um 00:44 schrieb Chia-I Wu:
> This is motivated by OOB access in amdgpu_vm_update_range when
> offset_in_bo+map_size overflows.
>
> v2: keep the validations in amdgpu_vm_bo_map
> v3: add the validations to amdgpu_vm_bo_map/amdgpu_vm_bo_replace_map
>      rather than to amdgpu_gem_va_ioctl
>
> Fixes: 9f7eb5367d00 ("drm/amdgpu: actually use the VM map parameters")
> Signed-off-by: Chia-I Wu <olvaffe@...il.com>

Reviewed-by: Christian König <christian.koenig@....com>

> ---
>   drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c | 16 ++++++++--------
>   1 file changed, 8 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
> index 22f9a65ca0fc7..76d57bc7ac620 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
> @@ -1434,14 +1434,14 @@ int amdgpu_vm_bo_map(struct amdgpu_device *adev,
>   	uint64_t eaddr;
>   
>   	/* validate the parameters */
> -	if (saddr & ~PAGE_MASK || offset & ~PAGE_MASK ||
> -	    size == 0 || size & ~PAGE_MASK)
> +	if (saddr & ~PAGE_MASK || offset & ~PAGE_MASK || size & ~PAGE_MASK)
> +		return -EINVAL;
> +	if (saddr + size <= saddr || offset + size <= offset)
>   		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;
>   
> @@ -1500,14 +1500,14 @@ int amdgpu_vm_bo_replace_map(struct amdgpu_device *adev,
>   	int r;
>   
>   	/* validate the parameters */
> -	if (saddr & ~PAGE_MASK || offset & ~PAGE_MASK ||
> -	    size == 0 || size & ~PAGE_MASK)
> +	if (saddr & ~PAGE_MASK || offset & ~PAGE_MASK || size & ~PAGE_MASK)
> +		return -EINVAL;
> +	if (saddr + size <= saddr || offset + size <= offset)
>   		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;
>