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Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. grsecurity is a set of patches for the Linux kernel with an emphasis on enhancing security. Its typical application is in computer systems that accept remote connections from untrusted locations, such as web servers and systems...
Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. grsecurity is a set of patches for the Linux kernel with an emphasis on enhancing security. Its typical application is in computer systems that accept remote connections from untrusted locations, such as web servers and systems offering shell access to its users. Released under the GNU General Public License, grsecurity is free software. A major component bundled with grsecurity is PaX. Amongst other things, the patch flags data memory-such as that on the stack-as non-executable, and program memory as non-writable. The aim is to prevent memory from being overwritten, which prevents many types of security vulnerabilities, such as buffer overflows. PaX also provides address space layout randomization, which randomizes important memory addresses to hinder attacks that rely on such addresses being easily known. PaX is not itself developed by the grsecurity developers, and is also available independently from grsecurity.
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