If Yahoo contracted it they didn't have to do it at kernel. In fact, more costly.
same here - bunch of attack-defense CTF binaries (without source) had system() injection
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LD_PRELOAD'ed the same system() wrapper into all of them, didn't have to fiddle with any binary stuff
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of course, the QA standards for a big mail system should be slightly higher than those for CTFs...
End of conversation
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