CVE-2023-53497 in Linux
요약
\~에 의해 VulDB • 2026. 05. 28.
Based on the kernel log provided, here is an analysis of the crash, its likely cause, and potential solutions.
### 1. Crash Summary * **Subsystem:** V4L2 (Video for Linux 2) driver for the **Renesas VSP1** (Video Signal Processor). * **Trigger:** Application `yavta` (Yet Another Video Test Application) called `ioctl` with `VIDIOC_STREAMON`. * **Crash Location:** `vsp1_dl_list_add_body+0xa8/0xe0` * **Exception Type:** Likely a **Data Abort** (memory access violation) or **Invalid Instruction**, indicated by the `Code:` line and the crash in a low-level list manipulation function. * **Context:** The crash occurs while queuing a buffer (`vsp1_video_buffer_queue`) and starting the streaming pipeline (`vsp1_video_pipeline_run`).
### 2. Key Observations from the Register Dump * **`x0 = 0x0000000000000000`**: The first argument to `vsp1_dl_list_add_body` is **NULL**. * In the VSP1 driver, `x0` typically points to the `vsp1_dl_list` structure. * Passing a NULL pointer to `vsp1_dl_list_add_body` suggests that the driver failed to allocate or initialize a display list (`dl_list`) before trying to add a body to it. * **`x1 = ffff00000e4f6400`**: This is likely the `vsp1_video` or `vsp1_pipeline` structure. * **`x2 = 0x20`**: Likely the size or flags. * **`x3 = 0x20`**: Likely the size or flags. * **`x4 = ffff70000157043d`**: Kernel virtual address. * **`x5 = ffff80000ab821e0`**: Kernel virtual address. * **`x6 = 0x1`**: Likely a flag or index. * **`x7 = 00008ffffea8fbc4`**: Kernel virtual address. * **`x8 = ffff800000000000`**: Kernel virtual address.
### 3. Root Cause Analysis The crash in `vsp1_dl_list_add_body` with a NULL `x0` indicates that the driver attempted to add a display list body to a display list that was **not properly initialized or allocated**.
#### Possible Causes: 1. **Race Condition / Use-After-Free:** * The display list (`dl_list`) might have been freed or invalidated while the pipeline was still running or being set up. * This can happen if there is a bug in the cleanup path (`vsp1_video_stop_streaming`) that frees resources while `streamon` is still in progress.
2. **Memory Allocation Failure:** * `vsp1_dl_list_alloc` might have failed (returned NULL), but the driver did not check for this failure before proceeding to `vsp1_dl_list_add_body`. * This is less likely in modern kernels unless memory is extremely constrained, but possible.
3. **Hardware/Device Tree Issue:** * If the VSP1 hardware is not properly clocked or reset, internal structures might not be initialized correctly. * Incorrect device tree bindings could lead to missing resources.
4. **Driver Bug in Specific Kernel Version:** * This looks like a known issue in certain versions of the Renesas VSP1 driver, particularly around the handling of display lists in multi-pipeline scenarios. * Check if this is a regression in your kernel version.
### 4. Recommended Actions
#### A. Immediate Workarounds 1. **Restart the Service/Application:** * Since this is a kernel panic/oops, the system might be unstable. Rebooting the device is often necessary. 2. **Check for Concurrent Access:** * Ensure that no other process is accessing the V4L2 device while `yavta` is streaming. * Avoid opening the device multiple times without proper locking.
#### B. Debugging Steps 1. **Enable Kernel Debugging:** * Compile the kernel with `CONFIG_DEBUG_INFO=y` and `CONFIG_FRAME_POINTER=y` to get better stack traces. * Enable `CONFIG_V4L2_DEBUG` for more verbose V4L2 logging. 2. **Check dmesg for Earlier Errors
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