Unikraft Files

We are proud to announce the latest version of Unikraft, v0.19! This release comes with plenty of new features and updates.

[!WARNING] Be aware of the following potentially breaking changes:

The config options of libposix-process have been updated as follows:

• CONFIG_LIBPOSIX_PROCESS_PIDS and CONFIG_LIBPOSIX_PROCESS_CLONE are merged into a single option, CONFIG_LIBPOSIX_PROCESS_MULTITHREADING.
• CONFIG_LIBPOSIX_PROCESS_VFORK is replaced by CONFIG_LIBPOSIX_PROCESS_MULTIPROCESS.
• CONFIG_LIBPOSIX_PROCESS_INIT_PIDS is deprecated, and its functionality is enabled by default.

Here is the full updates list:

🚀 New Features

• lib/posix-process: POSIX signals (#1248) by @michpappas
• lib/posix-process: Add vfork & execve (#1386) by @michpappas
• [app-elfloader]: Introduce ELF binfmt loader (#79) by @michpappas
• lib/posix-process: Supplementary changes for multiprocess (#1627) by @michpappas
• [app-elfloader]: Supplementary changes for multiprocess (#90) by @michpappas
• lib/posix-process: exit() and wait() (#1630) by @michpappas
• drivers/ukps2: Add Firecracker shutdown driver and some minor Kconfig fixups (#1265) by @mogasergiu
• lib/posix-process: Graceful shutdown (#1633) by @michpappas
• [app-elfloader]: POSIX process graceful shutdown (#92) by @michpappas
• lib/posix-fdio: Add internal implementations of futime(n)s (#1575) by @andreittr
• lib/{ukfile, posix-socket, posix-unixsocket}: Add support for explicitly polled files & sockets (#1446) by @andreittr
• lib/posix-fdtab: Support independent (per-process) fdtabs (#1278) by @andreittr
• lib/posix-fd: Named open file descriptions (#1592) by @andreittr

🐛 Bug Fixes & Improvements

• lib/posix-process: Add README.md (#1644) by @michpappas
• lib/posix-process: Make multiprocess config select execve (#1642) by @mogasergiu
• lib/posix-process/arch/arm64: Save/restore lr/fp on clone asm stub (#1641) by @mogasergiu
• lib/posix-process: Terminate underlying thread only if added to sched (#1640) by @mogasergiu
• lib/posix-process: Make rt_sigtimedwait stub block (#1639) by @michpappas
• lib/ukvmem: Return ENOMEM for invalid addresses (#1638) by @mogasergiu
• lib/ukrandom: Validate getrandom input & rm assert (#1637) by @andreittr
• lib/vfscore: Fix write const path in automount (#1636) by @andreittr
• lib/syscall_shim/arch/x86: Properly fetch curr_fp in execenv entry (#1635) by @mogasergiu
• plat/xen: Add initrd support for arm64 (#1634) by @andreistan26
• lib/posix-process/signal: Add stub for CLONE_SIGHAND (#1628) by @michpappas
• lib/posix-process/signals: Fix conditional for sigsetops (#1626) by @michpappas
• libposix-process: Create PID1 from thread passed via init (#1620) by @michpappas
• lib/posix-process: Add signalfd/signalfd4 support (#1619) by @mogasergiu
• lib/posix-process: Define libc wrappers for clone/vfork (#1618) by @mogasergiu
• lib/posix-fdtab: Fix exec handler & ref leak on fdtab clone (#1617) by @andreittr
• lib/posix-pipe: Add pipe stat support (#1603) by @andreittr
• lib/posix-fd: Move heap-allocated open file descriptions out of fdtab (#1602) by @andreittr
• lib/syscall_shim: Use global scope inline asm for execenv prologue (#1598) by @mogasergiu
• lib/posix-unixsocket: Fix NULL crash on accept4() (#1593) by @andreittr
• lib/vfscore: Use uk_syscall_do for syscall delegation (#1591) by @mogasergiu
• lib/ukcpio: Add syscall_shim dep and use uk_syscall_do (#1590) by @mogasergiu
• lib/ramfs: Use kernel internal clock_gettime variant (#1587) by @mogasergiu
• lib/vfscore: Use kernel internal clock_gettime variant (#1586) by @mogasergiu
• lib/posix-process: Define kernel internal exit_group (#1585) by @mogasergiu
• lib/posix-process: Define kernel internal resource limit syscalls (#1584) by @mogasergiu
• lib/posix-process: Define kernel internal gettid/getppid/getpid (#1583) by @mogasergiu
• lib/posix-fdio: Adopt remaining file syscalls from vfscore (#1581) by @andreittr
• lib/ukfile: API: Change file offset and iovec length to size_t (#1580) by @andreittr
• lib/ukfile: Add try acquire operation (#1579) by @andreittr
• lib/posix-fdio: Fix wrong computation of dev_t (#1578) by @andreittr
• lib/syscall_shim: Autogenerate uk_syscall_* symbols at build time (#1577) by @mogasergiu
• lib/posix-fd: Move open file descriptions into own lib (#1574) by @andreittr
• lib/ukvmem: Use correct stack guard size macro for tests (#1573) by @mogasergiu
• lib/posix-timerfd: Output correct old_value on set (#1568) by @andreittr
• lib/posix-timerfd: Fix counter on subsequent reads (#1567) by @andreittr
• lib/posix-timerfd: Validate settime() argument (#1566) by @andreittr
• plat/kvm: Select HAVE_IBMPC only on x86_64 (#1565) by @shym
• lib/syscall-shim: Do not dereference optional clone() parameters (#1564) by @michpappas
• lib/posix-*: Remove hard dependency on posix-fdtab (#1437) by @andreittr
• lib/syscall_shim: Introduce syscall enter/exit routines tables (#1277) by @mogasergiu
• lib/nolibc: Update Musl-imported headers for signals (#1244) by @michpappas
• [app-elfloader]: Silence unused argument warnings for /etc/hostname (#93) by @andreittr
• [app-elfloader]: Check return value of uk_random_bytes() (#91) by @michpappas
• [app-elfloader]: Config.uk: Imply stdio file descriptors (#87) by @andreittr
• [app-elfloader]: Remove uk_syscall_ symbols from exportsyms.uk (#86) by @mogasergiu
• [lib-libelf]: Use Unikraft-provided __offsetof instead of own (#5) by @andreittr
• [lib-lwip]: init.c: Remove no-op term function (#62) by @andreittr
• [lib-lwip]: sockets.c: Use size_t for iovec length (#61) by @andreittr
• [lib-lwip]: socket.c: Update to posix-socket poll setup API (#58) by @andreittr
• [lib-musl]: arch/arm64: Save/restore link register on clone asm stub (#89) by @mogasergiu
• [lib-musl]: Adapt to updated libposix-process config options (#87) by @michpappas
• [lib-musl]: Replace clone/vfork assembly wrappers with our own (#86) by @mogasergiu
• [lib-musl]: Config.uk: Add posix-tty as dependency to stdio (#85) by @andreittr
• [lib-musl]: Makefile.uk.musl.signal: Fix arm64 architecture test (#83) by @shym

A big thank you also to all those who helped in the review process: Andrei Tatar, Cezar Crăciunoiu, Teodor Țeugea, Oleksii Moisieiev, Răzvan Deaconescu, Sergiu Moga, Ștefan Jumărea

For more information, check out the accompanying blog post or view the full changelog.