Build 17763 (1809)

For general Windows information on build 17763 visit the Windows Blog.

WSL

• Setpriority syscall permission check too strict for changing same thread priority [GH 1838]
• Ensure that unbiased interrupt time is used for boot time to avoid returning negative values for clock_gettime(CLOCK_BOOTTIME) [GH 3434]
• Handle symlinks in the WSL binfmt interpreter [GH 3424]
• Better handling of threadgroup leader file descriptor cleanup.
• Switch WSL to use KeQueryInterruptTimePrecise instead of KeQueryPerformanceCounter to avoid overflow [GH 3252]
• Ptrace attach may cause bad return value from system calls [GH 1731]
• Fix several AF_UNIX related issues [GH 3371]
• Fix issue that could cause WSL interop to fail if the current working directory is less than 5 characters long [GH 3379]
• Avoid one second delay failing loopback connections to non-existent ports [GH 3286]
• Add /proc/sys/fs/file-max stub file [GH 2893]
• More accurate IPV6 scope information.
• PR_SET_PTRACER support [GH 3053]
• Pipe filesystem inadvertently clearing edge-triggered epoll event [GH 3276]
• Win32 executable launched via NTFS symlink doesn't respect symlink name [GH 2909]
• Improved zombie support [GH 1353]
• Add wsl.conf entries for controlling Windows interop behavior [GH 1493]

    [interop]
  
    enabled=false # enable launch of Windows binaries; default is true
  
    appendWindowsPath=false # append Windows path to $PATH variable; default is true
  

• Fix for getsockname not always returning UNIX socket family type [GH 1774]
• Add support for TIOCSTI [GH 1863]
• Non-blocking sockets in the process of connecting should return EAGAIN for write attempts [GH 2846]
• Support interop on mounted VHDs [GH 3246, 3291]
• Fix permission checking issue on root folder [GH 3304]
• Limited support for TTY keyboard ioctls KDGKBTYPE, KDGKBMODE and KDSKBMODE.
• Windows UI apps should execute even when launched in the background.
• Add wsl -u or --user option [GH 1203]
• Fix WSL launch issues when fast startup is enabled [GH 2576]
• Unix sockets need to retain disconnected peer credentials [GH 3183]
• Non-blocking Unix sockets failing indefinitely with EAGAIN [GH 3191]
• case=off is the new default drvfs mount type [GH 2937, 3212, 3328]
  • See blog for more information.
• Add wslconfig /terminate to stop running distributions.
• Fix issue with the WSL shell context menu entries that do not correctly handle paths with spaces.
• Expose per-directory case sensitivity as an extended attribute
• ARM64: Emulate cache maintenance operations. Resolve dotnet issue.
• DrvFs: only unescape characters in the private range that correspond to an escaped character.
• Fix off-by-one error in ELF parser interpreter length validation [GH 3154]
• WSL absolute timers with a time in the past do not fire [GH 3091]
• Ensure newly created reparse points are listed as such in the parent directory.
• Atomically create case sensitive directories in DrvFs.
• Fixed an additional issue where multithreaded operations could return ENOENT even though the file exists. [GH 2712]
• Fixed WSL launch failure when UMCI is enabled. [GH 3020]
• Add explorer context menu to launch WSL [GH 437, 603, 1836]. To use, hold shift and right-click when in an explorer window.
• Fix Unix socket non-blocking behavior [GH 2822, 3100]
• Fix hanging NETLINK command as reported in GH 2026.
• Add support for mount propagation flags [GH 2911].
• Fix issue with truncate not causing inotify events [GH 2978].
• Add --exec option for wsl.exe to invoke a single binary without a shell.
• Add --distribution option for wsl.exe to select a specific distro.
• Limited support for dmesg. Applications can now log to dmesg. WSL driver logs limited information to dmesg. In future, this can be extended to carry other information/diagnostics from the driver.
  • Note: dmesg is currently supported through the /dev/kmsg device interface. syslog syscall interface is not yet supported. And, so, some of the dmesg command line options such as -S, -C don't work.
• Change default gid and mode of serial devices to match native [GH 3042]
• DrvFs now supports extended attributes.
  • Note: DrvFs has some limitations on the name of extended attributes. Some characters (like '/', ':' and '*') are not allowed, and extended attribute names are not case sensitive on DrvFs