Some operating systems, such as OpenBSD with its W^X feature, and Linux with the Exec Shield or PaX patches, may also limit the length of the code segment, as specified by the CS register, to disallow execution of code in modifiable regions of the address space.
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The W^X, Exec Shield, and PaX mechanisms described above emulate per-page non-execute support on machines x86 processors lacking the NX bit by setting the length of the code segment, with a performance loss and a reduction in the available address space.
The Shield | Sheffield Shield | Canadian Shield | shield | The Shield (TV series) | Operation United Shield | Claxton Shield | Blue Shield | The Black Shield of Falworth | Shute Shield | Ranfurly Shield | Guiana Shield | East of Scotland Shield | Blue Cross Blue Shield Association | Tom Clancy's Rainbow Six 3: Raven Shield#Athena Sword | Tom Clancy's Rainbow Six 3: Raven Shield | The Shield of Achilles | The Shield and the Sword | Supporters' Shield | Plunket Shield | Operation Defensive Shield | International Committee of the Blue Shield | Horizon Blue Cross Blue Shield of New Jersey | Golden Shield Project | FA Community Shield | Exec Shield | Captain America's shield | 1956 Claxton Shield | 1955 Claxton Shield | 1934 Claxton Shield |