Memory Leak Vulnerability in ceph Package

Background

The ceph package is a distributed storage system that provides high-performance, scalable, and reliable storage for applications. It is commonly used in cloud computing environments to store and manage large amounts of data. The vulnerability in question is a memory leak issue that occurs in the ceph_readdir function when the note_last_dentry function returns an error. This vulnerability can potentially lead to a depletion of system memory resources, resulting in degraded performance or even system crashes.

Vulnerability Detail

The memory leak vulnerability in ceph_readdir arises when the note_last_dentry function encounters an error. This can happen due to various reasons, such as invalid directory entries or filesystem corruption. When an error occurs, the function fails to release the allocated memory, leading to a memory leak. If this vulnerability is exploited, an attacker could potentially cause a denial-of-service (DoS) condition by repeatedly triggering the error and exhausting system memory resources. Additionally, the memory leak could result in performance degradation over time. The vulnerability has been addressed in the Linux Kernel version v5.10.111 by commit f4429786129648a8f4bb1e5faa143c4478cc5c4a.

Workaround

If updating the Linux Kernel is not immediately feasible, a temporary workaround can be implemented by modifying the ceph_readdir function to handle the error condition properly and release the allocated memory. Here is an example code snippet that demonstrates the workaround:

// Modified ceph_readdir function with error handling
int ceph_readdir(struct file *file, struct dir_context *ctx)
{
    // Existing code
    ...
    // Error handling
    if (note_last_dentry() < 0) {
        // Release allocated memory
        kfree(ctx->private);
        return -EINVAL;
    }
    ...
}

Conclusion

The memory leak vulnerability in the ceph package can have serious consequences, including system crashes and performance degradation. It is crucial to update the Linux Kernel to the recommended version or apply the provided workaround to mitigate the vulnerability. For further assistance and support in vulnerability remediation, please contact DevNack.com.

See every vulnerability recorded for Kernel →

FAQ