• Linus Torvalds's avatar
    Merge branch 'syscalls-next' of git://git.kernel.org/pub/scm/linux/kernel/git/brodo/linux · 642e7fd2
    Linus Torvalds authored
    Pull removal of in-kernel calls to syscalls from Dominik Brodowski:
     "System calls are interaction points between userspace and the kernel.
      Therefore, system call functions such as sys_xyzzy() or
      compat_sys_xyzzy() should only be called from userspace via the
      syscall table, but not from elsewhere in the kernel.
    
      At least on 64-bit x86, it will likely be a hard requirement from
      v4.17 onwards to not call system call functions in the kernel: It is
      better to use use a different calling convention for system calls
      there, where struct pt_regs is decoded on-the-fly in a syscall wrapper
      which then hands processing over to the actual syscall function. This
      means that only those parameters which are actually needed for a
      specific syscall are passed on during syscall entry, instead of
      filling in six CPU registers with random user space content all the
      time (which may cause serious trouble down the call chain). Those
      x86-specific patches will be pushed through the x86 tree in the near
      future.
    
      Moreover, rules on how data may be accessed may differ between kernel
      data and user data. This is another reason why calling sys_xyzzy() is
      generally a bad idea, and -- at most -- acceptable in arch-specific
      code.
    
      This patchset removes all in-kernel calls to syscall functions in the
      kernel with the exception of arch/. On top of this, it cleans up the
      three places where many syscalls are referenced or prototyped, namely
      kernel/sys_ni.c, include/linux/syscalls.h and include/linux/compat.h"
    
    * 'syscalls-next' of git://git.kernel.org/pub/scm/linux/kernel/git/brodo/linux: (109 commits)
      bpf: whitelist all syscalls for error injection
      kernel/sys_ni: remove {sys_,sys_compat} from cond_syscall definitions
      kernel/sys_ni: sort cond_syscall() entries
      syscalls/x86: auto-create compat_sys_*() prototypes
      syscalls: sort syscall prototypes in include/linux/compat.h
      net: remove compat_sys_*() prototypes from net/compat.h
      syscalls: sort syscall prototypes in include/linux/syscalls.h
      kexec: move sys_kexec_load() prototype to syscalls.h
      x86/sigreturn: use SYSCALL_DEFINE0
      x86: fix sys_sigreturn() return type to be long, not unsigned long
      x86/ioport: add ksys_ioperm() helper; remove in-kernel calls to sys_ioperm()
      mm: add ksys_readahead() helper; remove in-kernel calls to sys_readahead()
      mm: add ksys_mmap_pgoff() helper; remove in-kernel calls to sys_mmap_pgoff()
      mm: add ksys_fadvise64_64() helper; remove in-kernel call to sys_fadvise64_64()
      fs: add ksys_fallocate() wrapper; remove in-kernel calls to sys_fallocate()
      fs: add ksys_p{read,write}64() helpers; remove in-kernel calls to syscalls
      fs: add ksys_truncate() wrapper; remove in-kernel calls to sys_truncate()
      fs: add ksys_sync_file_range helper(); remove in-kernel calls to syscall
      kernel: add ksys_setsid() helper; remove in-kernel call to sys_setsid()
      kernel: add ksys_unshare() helper; remove in-kernel calls to sys_unshare()
      ...
    642e7fd2
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