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memdump - Online in the Cloud

Run memdump in OnWorks free hosting provider over Ubuntu Online, Fedora Online, Windows online emulator or MAC OS online emulator

This is the command memdump that can be run in the OnWorks free hosting provider using one of our multiple free online workstations such as Ubuntu Online, Fedora Online, Windows online emulator or MAC OS online emulator



memdump - memory dumper


memdump [-kv] [-b buffer_size] [-d dump_size] [-m map_file] [-p page_size]


This program dumps system memory to the standard output stream, skipping over holes in
memory maps. By default, the program dumps the contents of physical memory (/dev/mem).

Output is in the form of a raw dump; if necessary, use the -m option to capture memory
layout information.

Output should be sent off-host over the network, to avoid changing all the memory in the
file system cache. Use netcat, stunnel, or openssl, depending on your requirements.

The size arguments below understand the k (kilo) m (mega) and g (giga) suffixes. Suffixes
are case insensitive.


-k Attempt to dump kernel memory (/dev/kmem) rather than physical memory.

Warning: this can lock up the system to the point that you have to use the power
switch (for example, Solaris 8 on 64-bit SPARC).

Warning: this produces bogus results on Linux 2.2 kernels.

Warning: this is very slow on 64-bit machines because the entire memory address
range has to be searched.

Warning: kernel virtual memory mappings change frequently. Depending on the
operating system, mappings smaller than page_size or buffer_size may be missed or
may be reported incorrectly.

-b buffer_size (default: 0)
Number of bytes per memory read operation. By default, the program uses the
page_size value.

Warning: a too large read buffer size causes memory to be missed on FreeBSD or

-d dump-size (default: 0)
Number of memory bytes to dump. By default, the program runs until the memory
device reports an end-of-file (Linux), or until it has dumped from /dev/mem as much
memory as reported present by the kernel (FreeBSD, Solaris), or until pointer wrap-
around happens.

Warning: a too large value causes the program to spend a lot of time skipping over
non-existent memory on Solaris systems.

Warning: a too large value causes the program to copy non-existent data on FreeBSD

-m map_file
Write the memory map to map_file, one entry per line. Specify -m- to write to the
standard error stream. Each map entry consists of a region start address and the
first address beyond that region. Addresses are separated by space, and are printed
as hexadecimal numbers (0xhhhh).

-p page_size (default: 0)
Use page_size as the memory page size. By default the program uses the system page

Warning: a too large page size causes memory to be missed while skipping over holes
in memory.

-v Enable verbose logging for debugging purposes. Multiple -v options make the program
more verbose.

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