• Linus Torvalds's avatar
    Merge branch 'siginfo-linus' of... · ba9f6f89
    Linus Torvalds authored
    Merge branch 'siginfo-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace
    
    Pull siginfo updates from Eric Biederman:
     "I have been slowly sorting out siginfo and this is the culmination of
      that work.
    
      The primary result is in several ways the signal infrastructure has
      been made less error prone. The code has been updated so that manually
      specifying SEND_SIG_FORCED is never necessary. The conversion to the
      new siginfo sending functions is now complete, which makes it
      difficult to send a signal without filling in the proper siginfo
      fields.
    
      At the tail end of the patchset comes the optimization of decreasing
      the size of struct siginfo in the kernel from 128 bytes to about 48
      bytes on 64bit. The fundamental observation that enables this is by
      definition none of the known ways to use struct siginfo uses the extra
      bytes.
    
      This comes at the cost of a small user space observable difference.
      For the rare case of siginfo being injected into the kernel only what
      can be copied into kernel_siginfo is delivered to the destination, the
      rest of the bytes are set to 0. For cases where the signal and the
      si_code are known this is safe, because we know those bytes are not
      used. For cases where the signal and si_code combination is unknown
      the bits that won't fit into struct kernel_siginfo are tested to
      verify they are zero, and the send fails if they are not.
    
      I made an extensive search through userspace code and I could not find
      anything that would break because of the above change. If it turns out
      I did break something it will take just the revert of a single change
      to restore kernel_siginfo to the same size as userspace siginfo.
    
      Testing did reveal dependencies on preferring the signo passed to
      sigqueueinfo over si->signo, so bit the bullet and added the
      complexity necessary to handle that case.
    
      Testing also revealed bad things can happen if a negative signal
      number is passed into the system calls. Something no sane application
      will do but something a malicious program or a fuzzer might do. So I
      have fixed the code that performs the bounds checks to ensure negative
      signal numbers are handled"
    
    * 'siginfo-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace: (80 commits)
      signal: Guard against negative signal numbers in copy_siginfo_from_user32
      signal: Guard against negative signal numbers in copy_siginfo_from_user
      signal: In sigqueueinfo prefer sig not si_signo
      signal: Use a smaller struct siginfo in the kernel
      signal: Distinguish between kernel_siginfo and siginfo
      signal: Introduce copy_siginfo_from_user and use it's return value
      signal: Remove the need for __ARCH_SI_PREABLE_SIZE and SI_PAD_SIZE
      signal: Fail sigqueueinfo if si_signo != sig
      signal/sparc: Move EMT_TAGOVF into the generic siginfo.h
      signal/unicore32: Use force_sig_fault where appropriate
      signal/unicore32: Generate siginfo in ucs32_notify_die
      signal/unicore32: Use send_sig_fault where appropriate
      signal/arc: Use force_sig_fault where appropriate
      signal/arc: Push siginfo generation into unhandled_exception
      signal/ia64: Use force_sig_fault where appropriate
      signal/ia64: Use the force_sig(SIGSEGV,...) in ia64_rt_sigreturn
      signal/ia64: Use the generic force_sigsegv in setup_frame
      signal/arm/kvm: Use send_sig_mceerr
      signal/arm: Use send_sig_fault where appropriate
      signal/arm: Use force_sig_fault where appropriate
      ...
    ba9f6f89
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