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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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