• Linus Torvalds's avatar
    Merge branch 'exit-cleanups-for-v5.16' of... · 5147da90
    Linus Torvalds authored
    Merge branch 'exit-cleanups-for-v5.16' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace
    
    Pull exit cleanups from Eric Biederman:
     "While looking at some issues related to the exit path in the kernel I
      found several instances where the code is not using the existing
      abstractions properly.
    
      This set of changes introduces force_fatal_sig a way of sending a
      signal and not allowing it to be caught, and corrects the misuse of
      the existing abstractions that I found.
    
      A lot of the misuse of the existing abstractions are silly things such
      as doing something after calling a no return function, rolling BUG by
      hand, doing more work than necessary to terminate a kernel thread, or
      calling do_exit(SIGKILL) instead of calling force_sig(SIGKILL).
    
      In the review a deficiency in force_fatal_sig and force_sig_seccomp
      where ptrace or sigaction could prevent the delivery of the signal was
      found. I have added a change that adds SA_IMMUTABLE to change that
      makes it impossible to interrupt the delivery of those signals, and
      allows backporting to fix force_sig_seccomp
    
      And Arnd found an issue where a function passed to kthread_run had the
      wrong prototype, and after my cleanup was failing to build."
    
    * 'exit-cleanups-for-v5.16' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace: (23 commits)
      soc: ti: fix wkup_m3_rproc_boot_thread return type
      signal: Add SA_IMMUTABLE to ensure forced siganls do not get changed
      signal: Replace force_sigsegv(SIGSEGV) with force_fatal_sig(SIGSEGV)
      exit/r8188eu: Replace the macro thread_exit with a simple return 0
      exit/rtl8712: Replace the macro thread_exit with a simple return 0
      exit/rtl8723bs: Replace the macro thread_exit with a simple return 0
      signal/x86: In emulate_vsyscall force a signal instead of calling do_exit
      signal/sparc32: In setup_rt_frame and setup_fram use force_fatal_sig
      signal/sparc32: Exit with a fatal signal when try_to_clear_window_buffer fails
      exit/syscall_user_dispatch: Send ordinary signals on failure
      signal: Implement force_fatal_sig
      exit/kthread: Have kernel threads return instead of calling do_exit
      signal/s390: Use force_sigsegv in default_trap_handler
      signal/vm86_32: Properly send SIGSEGV when the vm86 state cannot be saved.
      signal/vm86_32: Replace open coded BUG_ON with an actual BUG_ON
      signal/sparc: In setup_tsb_params convert open coded BUG into BUG
      signal/powerpc: On swapcontext failure force SIGSEGV
      signal/sh: Use force_sig(SIGKILL) instead of do_group_exit(SIGKILL)
      signal/mips: Update (_save|_restore)_fp_context to fail with -EFAULT
      signal/sparc32: Remove unreachable do_exit in do_sparc_fault
      ...
    5147da90
traps.c 14.3 KB