__cfi_check()

Posted May 26, 2021 7:11 UTC (Wed) by marcH (subscriber, #57642)
In reply to: __cfi_check() by corbet
Parent article: Control-flow integrity in 5.13

Ah yes of course: much faster to check that the argument is within the given range compared to looking for some value in the whole jump table.

> Sorry if that wasn't clear.

I read again trying to understand how I got that wrong and I think it's because I assumed that the "target address" was the address of the "target function" mentioned earlier.