CVE-2023-53497 in Linux
Resumen
por VulDB • 2026-05-14
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) / VSP1 (Video Signal Processor 1) driver. * **Trigger:** `streamon` ioctl call (starting video streaming). * **Crash Location:** `vsp1_dl_list_add_body+0xa8/0xe0` * **Error Type:** Likely a **NULL pointer dereference** or **invalid memory access** within the VSP1 display list (DL) management code. * **Process:** `yavta` (a common V4L2 testing tool).
### 2. Key Observations from the Log * **Call Trace:** ``` vsp1_dl_list_add_body+0xa8/0xe0 -> vsp1_video_pipeline_run+0x270/0x2a0 -> vsp1_video_buffer_queue+0x1c0/0x1d0 -> __enqueue_in_driver -> vb2_start_streaming -> vb2_core_streamon -> vsp1_video_streamon -> v4l_streamon ``` The crash occurs when the driver tries to add a body to a display list (`dl_list_add_body`) during pipeline setup for streaming.
* **Register State:** * `x0 = 0x0000000000000000`: This is the first argument to the function. In C, this is often a pointer. **A NULL pointer here strongly suggests a NULL dereference.** * `x1 = ff0000000e4f6400`: Likely a pointer to a structure (e.g., `vsp1_dl_body` or `vsp1_video_buffer`). * `x2 = 0x20`: Likely a size or count.
* **Code Snippet:** ``` Code: d50323bf d65f03c0 91008263 f9800071 (885f7c60) ``` The instruction at `885f7c60` is `885f7c60`, which is a load instruction (`ldr`) that likely accesses memory through a NULL pointer (since `x0` is 0).
### 3. Likely Root Cause The crash in `vsp1_dl_list_add_body` with `x0=0` typically means: 1. **Missing or Invalid Display List Body:** The driver is trying to add a body to a display list, but the body pointer is NULL. 2. **Pipeline State Mismatch:** The VSP1 pipeline is not properly initialized or configured before `streamon` is called. 3. **Hardware/Device Tree Issue:** The VSP1 hardware might not be correctly described in the device tree, leading to missing resources (e.g., no RPF/BUF entities connected). 4. **Buffer Queue Issue:** The buffer passed to `vsp1_video_buffer_queue` might be invalid or not properly allocated.
### 4. Troubleshooting Steps
#### A. Check Device Tree Configuration Ensure the VSP1 node and its connections (RPF, LBU, WPF, etc.) are correctly defined in the device tree. Look for: * Missing `ports` or `endpoint` definitions. * Incorrect `reg` or `interrupts` properties. * Missing clock or reset entries.
Example snippet to verify: ```dts vsp1: vsp1@fe920000 {
compatible = "renesas,vsp1"; reg = <0 0xfe920000 0 0x1000>; interrupts = <GIC_SPI 100 IRQ_TYPE_LEVEL_HIGH>; clocks = <&cpg CPG_MOD 724>; power-domains = <&sysc R8A77965_PD_ALWAYS_ON>; resets = <&cpg 724>; status = "okay"; // Ensure sub-devices are connected }; ```
#### B. Verify Buffer Allocation Since `yavta` is used, ensure that: 1. Buffers are correctly allocated using `VIDIOC_REQBUFS`. 2. Buffers are mapped using `VIDIOC_QUERYBUF` and `mmap`. 3. Buffers are queued using `VIDIOC_QBUF` **before**
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