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kvm-ioctls

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1 actionable advisory, newest first. Withdrawn advisories and news are excluded. Coverage is partial.

  1. Unratedcrates.ioPublished

    Undefined behaviour in kvm_ioctls::ioctls::vm::VmFd::create_device

    GHSA-3qx8-rv27-j6gp

    Affected
    • crates.io kvm-ioctls < 0.19.1
    Fixed in
    0.19.1· Vendor fix available
    Issue
    An issue was identified in the VmFd::createdevice function, leading to undefined behavior and miscompilations on rustc 1.82.0 and newer due to the function's violation of Rust's pointer safety rules. The function downcasted a mutable reference to its struct kvmcreatedevice argument to an immutable pointer, and then proceeded to pass this pointer to a mutating system call. Rustc 1.82.0 and newer elides subsequent reads of this structure's fields, meaning code will not see the value written by the kernel into the fd member. Instead, the code will observe the value that this field was initialized to prior to calling VmFd::createdevice (usually, 0). The issue started in kvm-ioctls 0.1.0 and was fixed in 0.19.1 by correctly using a mutable pointer.

    Recommended action: Upgrade to 0.19.1 or later, then redeploy and verify.A vendor fix does not resolve your finding until you verify it in your own systems.

    Sources:github.comSource checked Evidence →