Messages in this thread | | | From | Linus Torvalds <> | Date | Wed, 1 Apr 2020 16:55:42 -0700 | Subject | Re: [PATCH] signal: Extend exec_id to 64bits |
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On Wed, Apr 1, 2020 at 4:51 PM Linus Torvalds <torvalds@linux-foundation.org> wrote: > > It's literally testing a sequence counter for equality. If you get > tearing in the high bits on the write (or the read), you'd still need > to have the low bits turn around 4G times to get a matching value.
Put another way: first you'd have to work however many weeks to do 4 billion execve() calls, and then you need to hit basically a single-instruction race to take advantage of it.
Good luck with that. If you have that kind of God-like capability, whoever you're attacking stands no chance in the first place.
Linus
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