From owner-cvs-all  Wed Feb 16 13:11:47 2000
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From: Matt Dillon <dillon@FreeBSD.org>
Date: Wed, 16 Feb 2000 13:11:38 -0800 (PST)
To: cvs-committers@FreeBSD.org, cvs-all@FreeBSD.org
Subject: cvs commit: src/sys/kern kern_malloc.c src/sys/sys kernel.h
         src/sys/vm vm_kern.h vm_map.c vm_mmap.c src/lib/libc/sys mmap.2
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dillon      2000/02/16 13:11:37 PST

  Modified files:
    sys/kern             kern_malloc.c 
    sys/sys              kernel.h 
    sys/vm               vm_kern.h vm_map.c vm_mmap.c 
    lib/libc/sys         mmap.2 
  Log:
      Fix null-pointer dereference crash when the system is intentionally
      run out of KVM through a mmap()/fork() bomb that allocates hundreds
      of thousands of vm_map_entry structures.
  
      Add panic to make null-pointer dereference crash a little more verbose.
  
      Add a new sysctl, vm.max_proc_mmap, which specifies the maximum number
      of mmap()'d spaces (discrete vm_map_entry's in the process).  The value
      defaults to around 9000 for a 128MB machine.  The test is scaled for the
      number of processes sharing a vmspace (aka linux threads).  Setting
      the value to 0 disables the feature.
  
  PR: kern/16573
  Approved by: jkh
  
  Revision  Changes    Path
  1.64      +3 -2      src/sys/kern/kern_malloc.c
  1.62      +2 -1      src/sys/sys/kernel.h
  1.22      +2 -1      src/sys/vm/vm_kern.h
  1.186     +8 -2      src/sys/vm/vm_map.c
  1.107     +43 -5     src/sys/vm/vm_mmap.c
  1.20      +3 -2      src/lib/libc/sys/mmap.2



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