Firecracker v0.21.0

Added

• Support for booting with an initial RAM disk image. This image can be
  specified through the new initrd_path field of the /boot-source API
  request.

Fixed

• Fixed #1469 - Broken GitHub location for Firecracker release binary.
• The jailer allows changing the default api socket path by using the extra
  arguments passed to firecracker.
• Fixed #1456 - Occasional KVM_EXIT_SHUTDOWN and bad syscall (14) during
  VM shutdown.
• Updated the production host setup guide with steps for addressing
  CVE-2019-18960.
• The HTTP header parsing is now case insensitive.
• The put_api_requests and patch_api_requests metrics for net devices were
  un-swapped.

Changed

• Removed redundant --seccomp-level jailer parameter since it can be
  simply forwarded to the Firecracker executable using "end of command
  options" convention.
• Removed memory.dirty_pages metric.
• Removed options field from the logger configuration.
• Decreased release binary size by ~15%.
• Changed default API socket path to /run/firecracker.socket. This path
  also applies when running with the jailer.
• Disabled KVM dirty page tracking by default.
• Removed redundant RescanBlockDevice action from the /actions API.
  The functionality is available through the PATCH /drives API.
  See docs/api_requests/patch-block.md.

Firecracker v0.20.0

Added

• Added support for GICv2.

Fixed

• Fixed CVE-2019-18960 - Fixed a logical error in bounds checking performed
  on vsock virtio descriptors.
• Fixed #1283 - Can't start a VM in AARCH64 with vcpus number more than 16.
• Fixed #1088 - The backtrace are printed on panic, no longer causing a
  seccomp fault.
• Fixed #1375 - Change logger options type from Value to Vec to
  prevent potential unwrap on None panics.
• Fixed #1436 - Raise interrupt for TX queue used descriptors
• Fixed #1439 - Prevent achieving 100% cpu load when the net device rx is
  throttled by the ratelimiter
• Fixed #1437 - Invalid fields in rate limiter related API requests are
  now failing with a proper error message.
• Fixed #1316 - correctly determine the size of a virtio device backed
  by a block device.
• Fixed #1383 - Log failed api requests.

Changed

• Decreased release binary size by 10%.

Firecracker v0.19.1

Fixed (on top of v0.19.0):

• Fixed a logical error in bounds checking performed on vsock virtio descriptors (CVE-2019-18960).

Firecracker v0.18.1

Fixed (on top of v0.18.0):

• Fixed a logical error in bounds checking performed on vsock virtio descriptors (CVE-2019-18960).

Firecracker v0.19.0

Added

• New command-line parameter for firecracker, named --no-api, which
  will disable the API server thread. If set, the user won't be able to send
  any API requests, neither before, nor after the vm has booted. It must be
  paired with --config-file parameter. Also, when API server is disabled,
  MMDS is no longer available now.
• New command-line parameter for firecracker, named --config-file, which
  represents the path to a file that contains a JSON which can be used for
  configuring and starting a microVM without sending any API requests.
• The jailer adheres to the "end of command options" convention, meaning
  all parameters specified after -- are forwarded verbatim to Firecracker.
• Added KVM_PTP support to the recommended guest kernel config.
• Added entry in FAQ.md for Firecracker Guest timekeeping.

Changed

• Vsock API call: PUT /vsocks/{id} changed to PUT /vsock and no longer
  appear to support multiple vsock devices. Any subsequent calls to this API
  endpoint will override the previous vsock device configuration.
• Removed unused 'Halting' and 'Halted' instance states.

Fixed

• Fixed serial console on aarch64 (GitHub issue #1147).
• Upon panic, the terminal is now reset to canonical mode.
• Explicit error upon failure of vsock device creation.
• The failure message returned by an API call is flushed in the log FIFOs.
• Insert virtio devices in the FDT in order of their addresses sorted from
  low to high.
• Enforce the maximum length of the network interface name to be 16 chars as
  specified in the Linux Kernel.
• Changed the vsock property id to vsock_id so that the API client can be
  successfully generated from the swagger definition.

Firecracker v0.18.0

Added

• New device: virtio-vsock, backed by Unix domain sockets (GitHub issue #650).
  See docs/vsock.md.

Fixed

• Updated the documentation for integration tests.
• Fixed high CPU usage before guest network interface is brought up (GitHub
  issue #1049).
• Fixed an issue that caused the wrong date (month) to appear in the log.
• Fixed a bug that caused the seccomp filter to reject legit syscalls in some
  rare cases (GitHub issue #1206).
• Docs: updated the production host setup guide.
• Docs: updated the rootfs and kernel creation guide.

Removed

• Removed experimental support for vhost-based vsock devices.

Firecracker v0.17.0

Added

• New API call: PATCH /machine-config/, used to update VM configuration,
  before the microVM boots.
• Added an experimental swagger definition that includes the specification for
  the vsock API call.
• Added a signal handler for SIGBUS and SIGSEGV that immediately terminates
  the process upon intercepting the signal.
• Added documentation for signal handling utilities.
• Added [alpha] aarch64 support.
• Added metrics for successful read and write operations of MMDS, Net and Block devices.

Changed

• vcpu_count, mem_size_mib and ht_enabled have been changed to be mandatory
  for PUT requests on /machine-config/.
• Disallow invalid seccomp levels by exiting with error.

Fixed

• Incorrect handling of bind mounts within the jailed rootfs.
• Corrected the guide for Alpine guest setup.

Firecracker v0.16.0

Added

• Added [alpha] AMD support.
• New devtool command: prepare_release. This updates the Firecracker
  version, crate dependencies and credits in preparation for a new release.
• New devtool command: tag. This creates a new git tag for the specified
  release number, based on the changelog contents.
• New doc section about building with glibc.

Changed

• Dropped the JSON-formatted context command-line parameter from Firecracker
  in favor of individual classic command-line parameters.
• When running with jailer the location of the API socket has changed to
  <jail-root-path>/api.socket (API socket was moved inside the jail).
• PUT and PATCH requests on /mmds with data containing any value type other
  than String, Array, Object will return status code 400.
• Improved multiple error messages.
• Removed all kernel modules from the recommended kernel config.

Fixed

• Corrected the seccomp filter when building with glibc.

Removed

• Removed the seccomp.bad_syscalls metric.

Firecracker v0.15.2

Fixed

• Corrected the conditional compilation of the seccomp rule for madvise.

Firecracker v0.15.1

Fixed

• A madvise call issued by the musl allocator was added to the seccomp
  whitelist to prevent Firecracker from terminating abruptly when allocating
  memory in certain conditions.