mem man page on Kali

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MEM(4)			   Linux Programmer's Manual			MEM(4)

NAME
       mem, kmem, port - system memory, kernel memory and system ports

DESCRIPTION
       /dev/mem is a character device file that is an image of the main memory
       of the computer.	 It may be used, for example,  to  examine  (and  even
       patch) the system.

       Byte   addresses	  in  /dev/mem	are  interpreted  as  physical	memory
       addresses.  References to nonexistent  locations	 cause	errors	to  be
       returned.

       Examining  and  patching	 is  likely to lead to unexpected results when
       read-only or write-only bits are present.

       Since Linux  2.6.26,  and  depending  on	 the  architecture,  the  CON‐
       FIG_STRICT_DEVMEM  kernel  configuration	 option limits the areas which
       can be accessed through this file.  For example: on x86, RAM access  is
       not allowed but accessing memory-mapped PCI regions is.

       It is typically created by:

	   mknod -m 660 /dev/mem c 1 1
	   chown root:kmem /dev/mem

       The file /dev/kmem is the same as /dev/mem, except that the kernel vir‐
       tual memory rather than	physical  memory  is  accessed.	  Since	 Linux
       2.6.26,	this  file is available only if the CONFIG_DEVKMEM kernel con‐
       figuration option is enabled.

       It is typically created by:

	   mknod -m 640 /dev/kmem c 1 2
	   chown root:kmem /dev/kmem

       /dev/port is similar to /dev/mem, but the I/O ports are accessed.

       It is typically created by:

	   mknod -m 660 /dev/port c 1 4
	   chown root:kmem /dev/port

FILES
       /dev/mem
       /dev/kmem
       /dev/port

SEE ALSO
       chown(1), mknod(1), ioperm(2)

COLOPHON
       This page is part of release 4.14 of the Linux  man-pages  project.   A
       description  of	the project, information about reporting bugs, and the
       latest	 version    of	  this	  page,	   can	   be	  found	    at
       https://www.kernel.org/doc/man-pages/.

Linux				  2015-01-02				MEM(4)
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