CVE-2023-52580 in Linux
요약
\~에 의해 VulDB • 2026. 07. 01.
Based on the kernel log snippet provided, here is an analysis of the crash and potential causes:
### **1. Crash Summary** - **Type**: Kernel Oops/Panic (likely a NULL pointer dereference or invalid memory access). - **Triggering Context**: Network interrupt handling (`net_rx_action`) followed by CPU idle entry (`cpuidle_enter_state`). - **Key Functions in Call Trace**: - `igc_poll`: The NAPI poll function for the Intel IGC Ethernet driver. - `igc_process_skb_fields`: Processing received packet metadata. - `eth_get_headlen`: Calculating header length (likely where the fault occurred).
### **2. Root Cause Analysis** The crash occurs in `cpuidle_enter_state` but is triggered by a network interrupt (`common_interrupt`) that was being processed via NAPI (`igc_poll`). The critical clue is:
``` ? eth_get_headlen+0xa4/0xc0 igc_process_skb_fields+0xcd/0x150 igc_poll+0xc80/0x17b0 ```
This suggests that **`igc_process_skb_fields`** is passing an invalid or corrupted `skb` (socket buffer) structure to `eth_get_headlen`, which then causes a fault when accessing memory. The subsequent jump to `cpuidle_enter_state` indicates the system was attempting to enter a low-power state after handling the interrupt, but the crash likely happened during the cleanup or context switch phase.
### **3. Likely Causes** 1. **Driver Bug in IGC Driver**: - A bug in the `igc` driver’s NAPI poll function (`igc_poll`) may be corrupting the `skb` structure or passing an invalid pointer to `igc_process_skb_fields`. - This could happen if: - DMA descriptors are not properly synchronized. - Memory allocation for SKBs fails, but error handling is incomplete. - Race conditions in multi-queue processing.
2. **Hardware/PCIe Issue**: - Corrupted data from the NIC due to PCIe errors (e.g., TLP corruption) leading to invalid `skb` fields. - Check for PCIe AER (Advanced Error Reporting) logs: ```bash dmesg | grep -i "pcie\|aer" ```
3. **Kernel Bug in Network Stack**: - Less likely, but possible if `eth_get_headlen` is called with a malformed header length or invalid pointer.
4. **CPU Idle State Conflict**: - The crash occurs during CPU idle entry (`cpuidle_enter_state`). This could indicate: - A bug in the interaction between NAPI completion and CPU power management. - Interrupts not properly disabled before entering a low-power state.
### **4. Debugging Steps** 1. **Check for PCIe Errors**: ```bash dmesg | grep -i "pcie\|aer\|igc" journalctl -k | grep -i "igc" ```
2. **Update IGC Driver and Kernel**: - Ensure you are using the latest stable kernel version with updated `igc` driver patches. - Check for known bugs in your specific kernel version related to `igc`.
3. **Disable CPU Idle States Temporarily**: Add to GRUB boot parameters: ```bash processor.max_cstate=1 idle=poll ``` This will prevent the system from entering deep sleep states, which may help isolate if the issue is related to `cpuidle`.
4. **Enable IGC Driver Debugging**: - Load the driver with debug flags: ```bash modprobe igc debug=0x1F # Enable various debug levels ``` - Check for specific error messages in `dmesg` after reloading the module.
5. **Check Memory Corruption**: - Run a memory test (e.g., `memtest86+`) to rule out hardware RAM issues. - Use `kdump` and analyze the crash dump if available: ```bash sudo kexec -p /boot/vmlinuz-$(uname -r) --append="crashkernel=auto" echo c > /proc/sysrq-trigger # Trigger a crash for debugging (use with caution) ```
6. **Test with Alternative Driver**: - If available, test with the `e1000` or another compatible driver to see if the issue persists.
### **5. Workaround** If this is a known bug in your kernel version: - Upgrade to a newer kernel where the fix may already be
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