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In flow dissector there are no limits to the number of nested encapsulations or headers that might be dissected which makes for a nice DOS attack. This patch sets a limit of the number of headers that flow dissector will parse. Headers includes network layer headers, transport layer headers, shim headers for encapsulation, IPv6 extension headers, etc. The limit for maximum number of headers to parse has be set to fifteen to account for a reasonable number of encapsulations, extension headers, VLAN, in a packet. Note that this limit does not supercede the STOP_AT_* flags which may stop processing before the headers limit is reached. Reported-by: Hannes Frederic Sowa <hannes@stressinduktion.org> Signed-off-by: Tom Herbert <tom@quantonium.net> Signed-off-by: David S. Miller <davem@davemloft.net> |
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| README | ||
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.