Project aiming to reduce the risk of attacks on Linux systems
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Exec Shield is a project started at Red Hat, Inc in late 2002 with the aim of reducing the risk of worm or other automated remote attacks on Linux systems. The first result of the project was a security patch for the Linux kernel that emulates an NX bit on x86 CPUs that lack a native NX implementation in hardware. While the Exec Shield project has had many other components, some people refer to this first patch as Exec Shield.
The first Exec Shield patch attempts to flag data memory as non-executable and program memory as non-writeable. This suppresses many security exploits, such as those stemming from buffer overflows and other techniques relying on overwriting data and inserting code into those structures. Exec Shield also supplies some address space layout randomization for the mmap() and heap base.
The patch additionally increases the difficulty of inserting and executing shellcode, rendering most exploits ineffective. No application recompilation is necessary to fully utilize exec-shield, although some applications (Mono, Wine, XEmacs, Mplayer) are not fully compatible.
Other features that came out of the Exec Shield project were the Position Independent Executables (PIE), the address space randomization patch for Linux kernels, a wide set of glibc internal security checks that make heap and format string exploits near impossible, the GCC Fortify Source feature, and the port and merge of the GCC stack-protector feature.
ExecShield is a project started at Red Hat, Inc in late 2002 with the aim of reducing the risk of worm or other automated remote attacks on Linux systems...
(also known as non-exec) ExecShieldExec (errand service) This disambiguation page lists articles associated with the title Exec. If an internal link...
in June 2005. The PaX and ExecShield patchsets to the Linux kernel provide more complete implementations. The ExecShield patch for Linux supplies 19...
operating systems, such as OpenBSD with its W^X feature, and Linux with the ExecShield or PaX patches, may also limit the length of the code segment, as specified...
executable space protection (e.g. W^X). Some optional packages include: PaX ExecShield Openwall Newer variants of Microsoft Windows also support executable...
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to simply reload Brawl itself with modifications applied. Cybercrime ExecShield Heap overflow Integer overflow NX Bit – no-execute bit for areas of memory...
Archived from the original on 2007-03-21. "Limiting buffer overflows with ExecShield". redhat.com. Archived from the original on 2007-02-08. "Script Gallery...
Archived from the original on 2012-12-25. "Limiting buffer overflows with ExecShield". Red Hat. Archived from the original on 2007-02-08. "Extensions Added"...
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