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 cG5YjiE1 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me about how KASAN works, is there some >> mechanism to prevent data races between two threads? In the compiler perhaps? >> >> For example memory is de-allocated and shadow memory is poisoned but some other >> thread was just about to do a shadow memory check and was interrupted? >> >> I've read the kasan/vmalloc.c comments and from them I'd extrapolate that the >> caller needs to make sure there are not data races / memory barriers are in >> place. > >KASAN does nothing to deliberately prevent or detect races. Even if >the race leads to an OOB or UAF, KASAN might not be able to detect it. >But sometimes it does: if poisoned shadow memory values become visible >to the other thread/CPU before it makes a shadow memory value check. Thanks :) I've came up with a theoretical issue for the following dense series that might happen if there is some racing but I'll have to experiment if it actually happens. -- Kind regards Maciej Wieczór-Retman