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Kernel space: The vmsplice() Exploit

Feb 20, 2008, 16:00 (8 Talkback[s])
(Other stories by Jonathan Corbet)

"As this is being written, distributors are working quickly to ship kernel updates fixing the local root vulnerabilities in the vmsplice() system call. Unlike a number of other recent vulnerabilities which have required special situations (such as the presence of specific hardware) to exploit, these vulnerabilities are trivially exploited and the code to do so is circulating on the net. The author found himself wondering how such a wide hole could find its way into the core kernel code, so he set himself the task of figuring out just what was going on - a task which took rather longer than he had expected.

"The splice() system call, remember, is a mechanism for creating data flow plumbing within the kernel..."

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