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    Subject[PATCH 00/45] remove in-kernel syscall invocations (part 3 == remainder outside arch/)
    Date
    Here is a third series of patches which reduce the number of syscall
    invocations from within the kernel. Once this long-term goal is achieved,
    the syscall entry path can be streamlined.

    This series builds on top of

    - part1 (random bits and pieces)
    http://lkml.kernel.org/r/20180315190529.20943-1-linux@dominikbrodowski.net

    - part2 (net)
    http://lkml.kernel.org/r/20180316170614.5392-1-linux@dominikbrodowski.net

    and replaces the RFC of a subset of this series. Most of the patches are
    just "mindless" conversions and helpers. If wrappers or helpers are limited
    to one subsystem, I have named them do_*(), kern_*() or __sys_*(), depending
    on what was used by the subsystem and/or what was still available. Otherwise,
    I have used ksys_*() to reflect that this is meant as a drop-in replacement
    for sys_*() within the kernel.

    With this third series, *all* in-kernel callers of sys_*() and compat_sys_*()
    outside of arch/ are converted.[*] On top of this, three things may be
    attempted now:

    - ptregs system call conversion for x86-64.

    - re-work initramfs etc. code to not use in-kernel equivalents of
    syscalls, but operate on the VFS level instead.

    - re-work SYSCALL_DEFINEx() / COMPAT_SYSCALL_DEFINEx() to do the right
    thing depending on arch-specific requirements on padding, long long handling,
    etc. (Al Viro).

    Also thrown in are a patch by Michael Tautschnig to use proper
    SYSCALL_DEFINE0() macros on x86 and a patch by Howard McLauchlan to whitelist
    all syscalls for error injection.

    The whole series, including part 1 and part 2, can be found at

    https://git.kernel.org/pub/scm/linux/kernel/git/brodo/linux.git syscalls-next

    Thanks,
    Dominik

    [*] Within arch, only x86 is fully covered by these series.

    Dominik Brodowski (43):
    fs: add ksys_getdents64() helper; remove in-kernel calls to
    sys_getdents64()
    fs: add ksys_ioctl() helper; remove in-kernel calls to sys_ioctl()
    fs: add ksys_lseek() helper; remove in-kernel calls to sys_lseek()
    fs: add ksys_read() helper; remove in-kernel calls to sys_read()
    fs: add ksys_sync() helper; remove in-kernel calls to sys_sync()
    fs: add do_lookup_dcookie() helper; remove in-kernel call to syscall
    fs: add do_vmsplice() helper; remove in-kernel call to syscall
    fs: add kern_select() helper; remove in-kernel call to sys_select()
    fs: add ksys_truncate() wrapper; remove in-kernel calls to
    sys_truncate()
    fs: add ksys_p{read,write}64() helpers; remove in-kernel calls to
    syscalls
    fs: add ksys_fallocate() wrapper; remove in-kernel calls to
    sys_fallocate()
    fs: add do_compat_fcntl64() helper; remove in-kernel call to comapt
    syscall
    fs: add do_compat_select() helper; remove in-kernel call to comapt
    syscall
    fs: add do_compat_signalfd4() helper; remove in-kernel call to comapt
    syscall
    fs: add do_compat_futimesat() helper; remove in-kernel call to comapt
    syscall
    inotify: add do_inotify_init() helper; remove in-kernel call to
    syscall
    fanotify: add do_fanotify_mark() helper; remove in-kernel call to
    syscall
    fs/quota: add kernel_quotactl() helper; remove in-kernel call to
    syscall
    fs/quota: use COMPAT_SYSCALL_DEFINE for sys32_quotactl()
    kernel: add do_compat_sigaltstack() helper; remove in-kernel call to
    compat syscall
    kernel: add ksys_setsid() helper; remove in-kernel call to
    sys_setsid()
    kernel: provide ksys_*() wrappers for syscalls called by
    kernel/uid16.c
    sched: add do_sched_yield() helper; remove in-kernel call to
    sched_yield()
    kexec: call do_kexec_load() in compat syscall directly
    mm: add kernel_migrate_pages() helper, move compat syscall to
    mm/mempolicy.c
    mm: add kernel_move_pages() helper, move compat syscall to
    mm/migrate.c
    mm: add kernel_mbind() helper; remove in-kernel call to syscall
    mm: add kernel_[sg]et_mempolicy() helpers; remove in-kernel calls to
    syscalls
    mm: add ksys_readahead() helper; remove in-kernel calls to
    sys_readahead()
    ipc: add semtimedop syscall/compat_syscall wrappers
    ipc: add semget syscall wrapper
    ipc: add semctl syscall/compat_syscall wrappers
    ipc: add msgget syscall wrapper
    ipc: add shmget syscall wrapper
    ipc: add shmdt syscall wrapper
    ipc: add shmctl syscall/compat_syscall wrappers
    ipc: add msgctl syscall/compat_syscall wrappers
    ipc: add msgrcv syscall/compat_syscall wrappers
    ipc: add msgsnd syscall/compat_syscall wrappers
    x86: use _do_fork() in compat_sys_x86_clone()
    x86: remove compat_sys_x86_waitpid()
    x86: fix sys_sigreturn() return type to be long, not unsigned long
    kernel/sys_ni: sort cond_syscall() entries

    Howard McLauchlan (1):
    bpf: whitelist all syscalls for error injection

    Tautschnig, Michael (1):
    x86/sigreturn: use SYSCALL_DEFINE0

    arch/mips/kernel/linux32.c | 12 +-
    arch/parisc/kernel/sys_parisc.c | 16 +-
    arch/powerpc/kernel/sys_ppc32.c | 10 +-
    arch/s390/kernel/compat_linux.c | 14 +-
    arch/sh/kernel/sys_sh32.c | 4 +-
    arch/sparc/kernel/setup_32.c | 2 +-
    arch/sparc/kernel/sys_sparc32.c | 12 +-
    arch/x86/entry/syscalls/syscall_32.tbl | 4 +-
    arch/x86/ia32/sys_ia32.c | 26 +-
    arch/x86/include/asm/sys_ia32.h | 3 -
    arch/x86/include/asm/syscalls.h | 2 +-
    arch/x86/kernel/signal.c | 5 +-
    drivers/tty/sysrq.c | 2 +-
    fs/dcookies.c | 11 +-
    fs/fcntl.c | 12 +-
    fs/ioctl.c | 7 +-
    fs/notify/fanotify/fanotify_user.c | 14 +-
    fs/notify/inotify/inotify_user.c | 9 +-
    fs/open.c | 9 +-
    fs/quota/compat.c | 13 +-
    fs/quota/quota.c | 10 +-
    fs/read_write.c | 36 ++-
    fs/readdir.c | 11 +-
    fs/select.c | 29 +-
    fs/signalfd.c | 17 +-
    fs/splice.c | 12 +-
    fs/sync.c | 7 +-
    fs/utimes.c | 12 +-
    include/linux/compat.h | 6 +
    include/linux/quotaops.h | 3 +
    include/linux/syscalls.h | 27 +-
    init/do_mounts.c | 10 +-
    init/do_mounts_initrd.c | 4 +-
    init/do_mounts_md.c | 15 +-
    init/do_mounts_rd.c | 22 +-
    init/initramfs.c | 4 +-
    ipc/msg.c | 60 +++-
    ipc/sem.c | 44 ++-
    ipc/shm.c | 28 +-
    ipc/syscall.c | 58 ++--
    ipc/util.h | 31 ++
    kernel/compat.c | 55 ----
    kernel/kexec.c | 50 +++-
    kernel/power/hibernate.c | 2 +-
    kernel/power/suspend.c | 2 +-
    kernel/power/user.c | 2 +-
    kernel/sched/core.c | 8 +-
    kernel/signal.c | 14 +-
    kernel/sys.c | 65 ++++-
    kernel/sys_ni.c | 506 +++++++++++++++++++++------------
    kernel/uid16.c | 19 +-
    kernel/uid16.h | 14 +
    mm/mempolicy.c | 92 +++++-
    mm/migrate.c | 39 ++-
    mm/readahead.c | 7 +-
    55 files changed, 1030 insertions(+), 478 deletions(-)
    create mode 100644 kernel/uid16.h

    --
    2.16.2

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