Guard pages can prevent buffer overflow attacks, typically of global data, which attempt to overwrite adjacent regions in the processes address space, such as the global offset table.
An instantaneous alarm for memory page access is provided by a guard page. This can be helpful for a programme that has to keep track of the expansion of sizable dynamic data structures. For instance, some operating systems perform automatic stack checking using guard pages.
Any access results in a segmentation fault due to the guard page. As a result, the susceptible software terminates rather than continuing to run the attacker-supplied code if an attacker tries to overwrite nearby memory while exploiting a buffer overflow.
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