linux-kernel - Re: [EXTERNAL] [PATCH drm-misc-next 2/5] drm/imagination: vm: check for drm_gpuvm_range

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Message-ID: <bcd3a9fb156c773ac942818213e6192fe36dc6ac.camel@imgtec.com>
Date:   Tue, 28 Nov 2023 10:34:28 +0000
From:   Donald Robson <Donald.Robson@...tec.com>
To:     "daniel@...ll.ch" <daniel@...ll.ch>,
        Frank Binns <Frank.Binns@...tec.com>,
        Matt Coster <Matt.Coster@...tec.com>,
        "mripard@...nel.org" <mripard@...nel.org>,
        "airlied@...il.com" <airlied@...il.com>,
        "dakr@...hat.com" <dakr@...hat.com>,
        Sarah Walker <Sarah.Walker@...tec.com>
CC:     "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [EXTERNAL] [PATCH drm-misc-next 2/5] drm/imagination: vm: check
 for drm_gpuvm_range_valid()

Thanks Danilo.

Reviewed-by: Donald Robson <donald.robson@...tec.com>

On Sat, 2023-11-25 at 00:36 +0100, Danilo Krummrich wrote:
> *** CAUTION: This email originates from a source not known to Imagination Technologies. Think before you click a link or open an attachment ***
> 
> Extend pvr_device_addr_and_size_are_valid() by the corresponding GPUVM
> sanity checks. This includes a, previously missing, overflow check for
> the base address and size of the requested mapping.
> 
> Fixes: ff5f643de0bf ("drm/imagination: Add GEM and VM related code")
> Signed-off-by: Danilo Krummrich <dakr@...hat.com>
> ---
>  drivers/gpu/drm/imagination/pvr_vm.c | 9 ++++++---
>  drivers/gpu/drm/imagination/pvr_vm.h | 3 ++-
>  2 files changed, 8 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/gpu/drm/imagination/pvr_vm.c b/drivers/gpu/drm/imagination/pvr_vm.c
> index 09d481c575b0..1e89092c3dcc 100644
> --- a/drivers/gpu/drm/imagination/pvr_vm.c
> +++ b/drivers/gpu/drm/imagination/pvr_vm.c
> @@ -239,7 +239,7 @@ pvr_vm_bind_op_map_init(struct pvr_vm_bind_op *bind_op,
>  		return -EINVAL;
>  	}
>  
> -	if (!pvr_device_addr_and_size_are_valid(device_addr, size) ||
> +	if (!pvr_device_addr_and_size_are_valid(vm_ctx, device_addr, size) ||
>  	    offset & ~PAGE_MASK || size & ~PAGE_MASK ||
>  	    offset >= pvr_obj_size || offset_plus_size > pvr_obj_size)
>  		return -EINVAL;
> @@ -295,7 +295,7 @@ pvr_vm_bind_op_unmap_init(struct pvr_vm_bind_op *bind_op,
>  {
>  	int err;
>  
> -	if (!pvr_device_addr_and_size_are_valid(device_addr, size))
> +	if (!pvr_device_addr_and_size_are_valid(vm_ctx, device_addr, size))
>  		return -EINVAL;
>  
>  	bind_op->type = PVR_VM_BIND_TYPE_UNMAP;
> @@ -505,6 +505,7 @@ pvr_device_addr_is_valid(u64 device_addr)
>  /**
>   * pvr_device_addr_and_size_are_valid() - Tests whether a device-virtual
>   * address and associated size are both valid.
> + * @vm_ctx: Target VM context.
>   * @device_addr: Virtual device address to test.
>   * @size: Size of the range based at @device_addr to test.
>   *
> @@ -523,9 +524,11 @@ pvr_device_addr_is_valid(u64 device_addr)
>   *  * %false otherwise.
>   */
>  bool
> -pvr_device_addr_and_size_are_valid(u64 device_addr, u64 size)
> +pvr_device_addr_and_size_are_valid(struct pvr_vm_context *vm_ctx,
> +				   u64 device_addr, u64 size)
>  {
>  	return pvr_device_addr_is_valid(device_addr) &&
> +	       drm_gpuvm_range_valid(&vm_ctx->gpuvm_mgr, device_addr, size) &&
>  	       size != 0 && (size & ~PVR_DEVICE_PAGE_MASK) == 0 &&
>  	       (device_addr + size <= PVR_PAGE_TABLE_ADDR_SPACE_SIZE);
>  }
> diff --git a/drivers/gpu/drm/imagination/pvr_vm.h b/drivers/gpu/drm/imagination/pvr_vm.h
> index cf8b97553dc8..f2a6463f2b05 100644
> --- a/drivers/gpu/drm/imagination/pvr_vm.h
> +++ b/drivers/gpu/drm/imagination/pvr_vm.h
> @@ -29,7 +29,8 @@ struct drm_exec;
>  /* Functions defined in pvr_vm.c */
>  
>  bool pvr_device_addr_is_valid(u64 device_addr);
> -bool pvr_device_addr_and_size_are_valid(u64 device_addr, u64 size);
> +bool pvr_device_addr_and_size_are_valid(struct pvr_vm_context *vm_ctx,
> +					u64 device_addr, u64 size);
>  
>  struct pvr_vm_context *pvr_vm_create_context(struct pvr_device *pvr_dev,
>  					     bool is_userspace_context);