feat(tdx-attest): Rewrite TDX attestation in pure Rust#466
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Enable building with x86_64-unknown-linux-musl target by: 1. Vendoring minimal Linux kernel headers that are missing from MUSL: - linux/vm_sockets.h: vsock address family and sockaddr_vm struct - linux/types.h: kernel type aliases (__u8, __u32, __u64, etc.) - linux/ioctl.h: redirect to MUSL's sys/ioctl.h 2. Updating cfg conditions to include MUSL (target_env = "musl") alongside glibc (target_env = "gnu") 3. Modifying build.rs to prioritize vendored headers via include path This allows building statically-linked TDX attestation binaries using MUSL, which is useful for containerized deployments and systems without glibc. Tested: cargo build --target x86_64-unknown-linux-musl -p tdx-attest
Implement TDX attestation without C library dependencies: - get_quote: ConfigFS (Linux 6.7+) → VSock/QGS fallback - extend_rtmr: sysfs → ioctl fallback - get_report: ioctl via /dev/tdx_guest - get_supported_att_key_ids: returns Intel TDQE UUID Key changes: - Add vsock crate for QGS protocol communication - Probe availability before execution (separate NotSupported from errors) - Include original error context in error messages - Support both new dstack OS (ConfigFS/sysfs) and legacy 0.5.4 (VSock/ioctl) Tested on: - New dstack OS: ConfigFS for quote, sysfs for extend_rtmr - dstack 0.5.4: VSock for quote, ioctl for extend_rtmr
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Summary
tdx-attestin pure Rust, eliminating C code dependencytdx-attest-sysdependency fromtdx-attestChanges
tdx-attest/src/linux.rs: Complete rewrite with:
/dev/tdx_guest(legacy)tdx-attest/src/dummy.rs: Simplified stub implementation
tdx-attest/Cargo.toml: Replace
tdx-attest-syswithlibc+vsocktdx-attest/examples/test_tdx.rs: Test program with dcap-qvl verification
API
The public API:
get_quote(report_data: &[u8; 64]) -> Result<Vec<u8>>get_report(report_data: &[u8; 64]) -> Result<TdxReport>extend_rtmr(index: u32, event_type: u32, digest: [u8; 48]) -> Result<()>Test Results
dstack 0.6.0 (kernel 6.17.6-dstack)
dstack 0.5.4 (kernel 6.9.0-dstack)
Build Verification
cargo build -p tdx-attestcargo build --target x86_64-unknown-linux-musl -p tdx-attestdstack-attest,dstack-utilcargo clippy -p tdx-attest