malware writers don't read this . . . . . . . . . . . . . . . free() doesn't erase data in memoryhttps://twitter.com/patrickcoomans/status/865482168692232192 …
Yeah, I do @musllibc, FOSS & infosec stuff. But now is not the time for a mostly-/only-tech Twitter feed.
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Fiora Aeternal Suffering 🎃 Retweeted Patrick Coomans @B-Hive 🚀
malware writers don't read this . . . . . . . . . . . . . . . free() doesn't erase data in memoryhttps://twitter.com/patrickcoomans/status/865482168692232192 …
Fiora Aeternal Suffering 🎃 added,
from past experience, there's like 50:50 odds they did memset to 0 after but NOBODY EXPECTS THE DEAD STORE ELIMINATION
(https://godbolt.org/g/mNuH5R - srsly, nobody expects this.)
I guess you have to specifically use a secure memset that's flagged to not be optimized out? Ouch
It's more complicated. Much so. Even such a memset can't get rid of temp copies on stack, vector regs, etc.
If a signal occurred, copies of all regs will be saved waaaay down the stack, too...
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