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Full Discussion: Memory sniffing in linux
Top Forums Programming Memory sniffing in linux Post 302276378 by Corona688 on Tuesday 13th of January 2009 02:13:50 PM
Old 01-13-2009
/proc/n/maps shows what segments are mapped into a process' memory:

Code:
$ cat /proc/$$/maps
08048000-080e3000 r-xp 00000000 03:02 737092     /bin/bash
080e3000-080e8000 rw-p 0009a000 03:02 737092     /bin/bash
080e8000-0810e000 rw-p 080e8000 00:00 0          [heap]
b7d7f000-b7dc0000 rw-p b7d7f000 00:00 0
b7dc0000-b7dc8000 r-xp 00000000 03:02 610050     /lib/libnss_files-2.4.so
b7dc8000-b7dca000 rw-p 00007000 03:02 610050     /lib/libnss_files-2.4.so
b7dca000-b7dd2000 r-xp 00000000 03:02 610082     /lib/libnss_nis-2.4.so
b7dd2000-b7dd4000 rw-p 00007000 03:02 610082     /lib/libnss_nis-2.4.so
b7dd4000-b7de5000 r-xp 00000000 03:02 610079     /lib/libnsl-2.4.so
b7de5000-b7de7000 rw-p 00010000 03:02 610079     /lib/libnsl-2.4.so
b7de7000-b7de9000 rw-p b7de7000 00:00 0
b7de9000-b7def000 r-xp 00000000 03:02 610084     /lib/libnss_compat-2.4.so
b7def000-b7df1000 rw-p 00005000 03:02 610084     /lib/libnss_compat-2.4.so
b7df1000-b7df2000 rw-p b7df1000 00:00 0
b7df2000-b7f09000 r-xp 00000000 03:02 610107     /lib/libc-2.4.so
b7f09000-b7f0b000 r--p 00116000 03:02 610107     /lib/libc-2.4.so
b7f0b000-b7f0d000 rw-p 00118000 03:02 610107     /lib/libc-2.4.so
b7f0d000-b7f10000 rw-p b7f0d000 00:00 0
b7f10000-b7f12000 r-xp 00000000 03:02 609797     /lib/libdl-2.4.so
b7f12000-b7f14000 rw-p 00001000 03:02 609797     /lib/libdl-2.4.so
b7f14000-b7f4d000 r-xp 00000000 03:02 962933     /lib/libncurses.so.5.6
b7f4d000-b7f56000 rw-p 00038000 03:02 962933     /lib/libncurses.so.5.6
b7f56000-b7f57000 rw-p b7f56000 00:00 0
b7f62000-b7f64000 rw-p b7f62000 00:00 0
b7f64000-b7f65000 r-xp b7f64000 00:00 0          [vdso]
b7f65000-b7f7f000 r-xp 00000000 03:02 609869     /lib/ld-2.4.so
b7f7f000-b7f80000 r--p 00019000 03:02 609869     /lib/ld-2.4.so
b7f80000-b7f81000 rw-p 0001a000 03:02 609869     /lib/ld-2.4.so
bf939000-bf94f000 rw-p bf939000 00:00 0          [stack]

The bolded segments contain live data, while the rest are shared libraries or kernel things.

/proc/n/mem allows arbitrary access to a process' virtual memory space, but only for the root user.
 

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LEARN ABOUT XFREE86

ipcmk

IPCMK(1)							   User Commands							  IPCMK(1)

NAME

       ipcmk - make various IPC resources

SYNOPSIS

       ipcmk [options]

DESCRIPTION

       ipcmk allows you to create shared memory segments, message queues, and semaphore arrays.

OPTIONS

       Resources can be specified with these options:

       -M, --shmem size
	      Create  a  shared  memory  segment of size bytes.  The size argument may be followed by the multiplicative suffixes KiB (=1024), MiB
	      (=1024*1024), and so on for GiB, etc. (the "iB" is optional, e.g., "K" has the same meaning as "KiB") or the suffixes KB (=1000), MB
	      (=1000*1000), and so on for GB, etc.

       -Q, --queue
	      Create a message queue.

       -S, --semaphore number
	      Create a semaphore array with number of elements.

       Other options are:

       -p, --mode mode
	      Access permissions for the resource.  Default is 0644.

       -V, --version
	      Display version information and exit.

       -h, --help
	      Display help text and exit.

SEE ALSO

       ipcrm(1), ipcs(1)

AUTHOR

       Hayden A. James <hayden.james@gmail.com>

AVAILABILITY

       The  ipcmk  command  is	part  of the util-linux package and is available from Linux Kernel Archive <https://www.kernel.org/pub/linux/utils
       /util-linux/>.

util-linux							     July 2014								  IPCMK(1)
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