CVE-2023-53497 in Linux
Riassunto
di VulDB • 20/06/2026
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:** `ioctl` call `VIDIOC_STREAMON` (starting video streaming). * **Process:** `yavta` (a common V4L2 testing utility). * **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.
### 2. Key Observations from the Call Trace ``` vsp1_dl_list_add_body+0xa8/0xe0 vsp1_video_pipeline_run+0x270/0x2a0 vsp1_video_buffer_queue+0x1c0/0x1d0 __enqueue_in_driver+0xbc/0x260 vb2_start_streaming+0x48/0x200 vb2_core_streamon+0x13c/0x280 vb2_streamon+0x3c/0x90 vsp1_video_streamon+0x2fc/0x3e0 v4l_streamon+0x50/0x70 ``` * The crash occurs when the driver tries to **add a display list body** (`dl_list_add_body`) during pipeline setup. * This happens while queuing a buffer (`vsp1_video_buffer_queue`) as part of starting streaming (`streamon`). * The function `vsp1_dl_list_add_body` is responsible for building DMA descriptors for the VSP hardware.
### 3. Likely Causes
#### A. Null Pointer Dereference or Invalid Memory Access The most common cause for crashes in `dl_list_add_body` is: 1. **Invalid Buffer Pointer:** The buffer passed to the driver is not properly mapped or has been freed prematurely. 2. **Corrupted Display List:** The internal display list structure (`dl_list`) is corrupted, possibly due to: * Race conditions in buffer queuing. * Missing synchronization (spinlocks/mutexes) around list manipulation. * Hardware state inconsistency (e.g., previous streamon/streamoff sequence failed).
#### B. VSP1 Driver Bug (Known Issues) The VSP1 driver has had historical issues with: * **Display List Management:** Bugs in how DMA descriptors are chained or freed. * **Pipeline State:** Incorrect handling of multiple pipelines or formats. * **Memory Allocation:** Failure to allocate memory for the display list body, leading to a null pointer dereference.
#### C. Hardware/Device Tree Issue * Incorrect device tree configuration for the VSP1 unit or its input/output entities. * Missing or incorrect clock/power domain settings.
### 4. Debugging Steps
#### Step 1: Check for Recent Changes * Did this crash start after a kernel update? * Did you change the device tree or V4L2 application code?
#### Step 2: Enable Kernel Debugging Add these kernel parameters to get more details: ```bash loglevel=8 oops=panic ``` Or, if you can recompile the kernel, enable: ```bash CONFIG_VSP1_DEBUG=y CONFIG_V4L2_DEBUG=y ```
#### Step 3: Analyze the `Code:` Line ``` Code: d50323bf d65f03c0 91008263 f9800071 (885f7c60) ``` * `885f7c60` is the instruction that caused the fault. * Decode this instruction using `aarch64-linux-gnu-objdump` or online ARM64 disassemblers to see if it’s a load/store (e.g., `ldr`, `str`) or a branch. This will confirm if it’s a memory access fault.
#### Step 4: Test with Minimal V4L2 Application Instead of `yavta`, try a simple C program that: 1. Opens the V4L2 device. 2. Sets format and buffer count. 3. Calls `VIDIOC_STREAMON`. 4. Immediately calls `VIDIOC_STREAMOFF`.
If it crashes consistently, it’s likely a driver/hardware issue. If it works, the
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