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