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I understand everything is a flat file in Linux. How hard is it to dump the contents of the main memory into a flat file? Does it already exist in Linux? If yes, what's the path to the file? What are the default permissions?

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up vote 5 down vote accepted

/dev/mem is probably what you are looking for, this file is manipulated like any other device file with dd and other utilities.

Permissions on my Debian linux system are:

crw-r----- 1 root kmem 1, 1 Aug 21 09:31 mem

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kcore is (should be) an exact copy of what is running in memory.

cat /proc/kcore

should be readable by everyone.

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On my system it's -r-------- 1 root root –  Michael Mrozek Sep 12 '11 at 13:22
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It had better not be readable by anyone but root, since it allows snooping on the memory of every process. /proc/kcore on Linux is readable only by root. Also, /proc/kcore is the kernel's memory mapping; /dev/mem is the physical RAM. –  Gilles Sep 13 '11 at 6:47
    
I see thanks for the information –  sethu Sep 14 '11 at 19:15
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