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Security Advisories: GSA_kwCzR0hTQS0zcXg4LXJ2MjctajZncM4ABCrU

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

An issue was identified in the VmFd::create_device 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 kvm_create_device 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::create_device (usually, 0).

The issue started in kvm-ioctls 0.1.0 and was fixed in 0.19.1 by correctly using
a mutable pointer.

Permalink: https://github.com/advisories/GHSA-3qx8-rv27-j6gp
JSON: https://advisories.ecosyste.ms/api/v1/advisories/GSA_kwCzR0hTQS0zcXg4LXJ2MjctajZncM4ABCrU
Source: GitHub Advisory Database
Origin: Unspecified
Severity: Moderate
Classification: General
Published: 4 days ago
Updated: 4 days ago

Identifiers: GHSA-3qx8-rv27-j6gp
References:

• https://github.com/rust-vmm/kvm/pull/298
• https://rustsec.org/advisories/RUSTSEC-2024-0428.html
• https://github.com/advisories/GHSA-3qx8-rv27-j6gp

Repository: https://github.com/rust-vmm/kvm
Blast Radius: 0.0

Affected Packages