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memguard (9)
  • >> memguard (9) ( FreeBSD man: Ядро )

  • BSD mandoc
     

    NAME

    
    
    MemGuard
    
     - memory allocator for debugging purposes
    
     
    

    SYNOPSIS

    options DEBUG_MEMGUARD  

    DESCRIPTION

    is a simple and small replacement memory allocator designed to help detect tamper-after-free scenarios. These problems are more and more common and likely with multithreaded kernels where race conditions are more prevalent.

    Currently, can only take over malloc (,);
    realloc ();
    and free ();
    for a particular malloc type.  

    EXAMPLES

    To use for memory type compiled into the kernel, one has to add the following line to the /boot/loader.conf
    vm.memguard.desc=<memory_type>
    

    Where memory_type is a short description of memory type to monitor. The short description of memory type is the second argument to MALLOC_DEFINE9, so one has to find it in the kernel source.

    To use for memory type defined in a kernel module, one has to set vm.memguard.desc sysctl(8) variable before loading the module:

    sysctl vm.memguard.desc=<memory_type>
    

    The vm.memguard.divisor boot-time tunable is used to scale how much of kmem_map one wants to allocate for . The default is 10, so kmem_size /10 bytes will be used. The kmem_size value can be obtained via the vm.kmem_size sysctl(8) variable.  

    SEE ALSO

    sysctl(8), vmstat(8), contigmalloc(9), malloc(9), redzone(9)  

    HISTORY

    first appeared in Fx 6.0 .  

    AUTHORS

    An -nosplit was written by An Bosko Milekic Aq [email protected] . This manual page was written by An Christian Brueffer Aq [email protected] .  

    BUGS

    Currently, it is not possible to override UMA zone(9) allocations.


     

    Index

    NAME
    SYNOPSIS
    DESCRIPTION
    EXAMPLES
    SEE ALSO
    HISTORY
    AUTHORS
    BUGS


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