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Re: Task emulation vectors

On Jun 16, 2007, at 4:05 PM, Mo McRoberts wrote:
This is a bit of long shot, but does anybody have any ideas what happened to the code (other than “it was taken out”, obviously), or if there was a particular reason for its removal? After all, it doesn't take much of a genius to see what the possibilities would be if system call emulation was still present and functional in current releases of XNU!

A Google search for "Mac OS X system call emulation" leads to http:// docs.info.apple.com/article.html?artnum=301327 ("About the security content of the Mac OS X 10.3.9 Update"):

"The kernel contains syscall emulation functionality that is not used in Mac OS X. Insufficient validation of an input parameter list could result in a heap overflow and a local denial of service through a kernel panic. The issue is addressed by removing the syscall emulation functionality."

Glancing at the Darwin sources confirm that the syscall emulation code was removed between 10.3.8 and 10.3.9.

Alexei



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